leOM 2-MeterHandhelds

The le-02AT and rC-2ATcome standard with an IC-BP3NiCd battery pack. flexibleantenna, A( wall charger,belt Clip, w rist st rap and earplug See the IC-olAT andIC-2AT 2-meter hendnelds atyour local ICOM dealer.

Accessories. A variety ofslide-on battery packs are iNail­able for the Ie-OlAT andIe-lAT. inckJding the ne'Nlong-life BOOmAh IC-BPa\Nhidl can be used w ith rothhandhetds.

Other accessories includethe HS-IO room headset.HS-I OSB PIT switcnbox.HS-IOSA VOX unit (forIC-olATI and an assortmentof battery pack chargers.

bon. The IC-2A is also avail­ableand has the same featuresas the Ie -2AT except DTMF.

IC-2AT Features. TheIC-2AT is ICOM's most popu­lar handheld on the market.The IC-2AT features a DTMFpad, 1.5 watts output andthumbwheel frequency serec-

• DTMF direct keyboard entry• LCD readout• 3 w atts standard. 5 watts

optional (with 1(-SP7 bat­tery pack!

• 10 memories which storeduplex onset and Pl tone(odd orrser can be stored inlast 4 memories!

• Frequency dial lock• Three scanning systems:

priority, memory and pro­grammable band scan(selectable increments of 5,10 . 15, 20 or 25KHz)

If you want a 2-meterhandheld with exceptionalfeatures, quality built to lastand a wide variety of inter­changeable accessories.take a look at the ICOMrc-ozsr and IC-2AT hand­herds.

Frequency Coverage. TheIC-olAT covers 140.000through 151.550MHz and theIC-lAT. 141500 through149.994MHz...torn includefrequencies for MARS opera­t ion.

IC-OlAT Features. ICOM'srco-or-tre-une rc-OlAThand­held has the folkJwing out­standIng features:

IC-2AT

IC-OMT

Often imitated,never duplicated. ICOM

First in GommuQicat ionsICOM AmerlYil , Inc., 2380-1I6th I'!,ve NE, Bellevue, WI'!, 98004 / 3331 Towerwood DI1Ye. Suite 307, Dallas. TX 75234

All . ....HI 'f'KIl'IurI........'" iIIp9r<D:,...."' .... oub1"'<" to~ MtI'oOuI IlC>tItt Of oDlig_ NI 'COM .ad.... foIVWlIcanlly "'....,.,., f CC .~ -..g__ "'" .. OZA.fl85

PHOENIX, AZ 650151702 W. Camelback Rd.

(602 ) 242-351 5: Bob, K7RCHEoo-' '" ......., . 11

VAN NUYS. CA ' 14016265 S&9ulveda Blvd

(BI B) 988-2212: AI, Mgr. K6YRASan 0ie0<> r...., .a' Victory 810d

SAN DIEGO. C o\. 821235375 KN rny ViII. Rd ,

{619 j 56O-<t900: Glenn, Mg. K6N A.....,. '83 aa._I_ IlM:l

~ OAKLAND. CA 946lM1~ 2210 Livingston St.,

(415) "51-571)7: Don , Mgr. N61PEH>oy. 17 10 23«1 "'"., Ell"

ANAHEIM, CA n 8012620 W, La Palma

(714) 161-3033, (213) 660-2040~_n eo.n.ytand & Knon . Berry h .m

BURLINGAME, CA M010999 Howa rd "'.....

(415) 3012-5757: Geo<~. Mg •. WB60SV5 _ IOU'" on 10l 'rom Sf0

Bob Ferrero W8RJPflttid<tnl

Jim Rafferty N8RJVP So. callI Cov

Anat*m Mg.

THINGS TO LOOK FOR(AND LOOK OUT FOR)IN A PHONE PATCH

PRIVATE PATCH IIISIMPLEX SEMI·DUPLEX INTERCONNECT

The telephone is the most power1ul mode of communications •..PRIVATE PATCH III gives you full use of your home telephone fromyour mobile and HT radios!

MADISON ELECTRONICS SUPPLTHOY.1 OO, TX

MIAMI RADIO CENTER C()oA PM,am, FL

CANAD A-DOLLARD ElECTIIONICSV_. DC

SII YWAVE RADIO SYSTEMS- L TD.Ilumool>y. B C

...Il.ES EL ECTAONICS

Ft~."''''''FL

~ 1ll$T1Il8tfTlNG CORP,

-~PACt ENGtN EEJUNG,-'"ftlE HAM STATIONh_1N

TEX.AS TOWERSPlano. TX

TNT flADlO SALESRoot>on&<la"" MN

WESTCOMsan M",cos, CA

A t,IIATEUR ELE CTRONIC SUPPLYM,'",.",.,.. WI. W ICkIM" Oh.Orlarm FL. OfIa,..a,... FLLas V"lja' J'>V

8A.RRY ELECTRONICS CORP._ Torll. NT

COlES COfIO"UNIC,I,TIOHS

san """""'" l~ro<~

Woo:lbo idl;je. VA

ERlClISOl'l COfIOIiIlUNICATlONS

"'-' "HAIII RADIO OUTLET-'-m CA. 9""'nv->e CA,oa'lan<l CA. _ .. AI.san DIego CA, Van N"y. CA

HE NRY RADIO

Los A"9"'''' CAINTERNATIONAL RADIOSYSTEMS

M,amo, FL

JUNS ElECTRONICSe--01yCA

vox .. . the right choice!VOX based phone patches offer many perfor­mance and operational advantages over thesampl ing method. These inc lude operati onthrough repeaters, compati bi lity w ith anyradio, no lost words or syllables, greater range,smooth audio free of continual noise bursts,etc., etc.

Most amateurs are not aware that the competi­ti on 's top of the l ine patch is VOX based. (Youknow ... the $1000 model they enthusiasticallycall " our favorite commercial simplex patch"on page 3 of their SP brocnure.lPRIVATE PATCH III o ffers about the samecapability, performance and features as theirtop model but is priced closer to their bottomof the line (SPj model!

So why settle lor SP when top at the line costslittle more?

• •

.1'..... .1'_ lD- --" --• •

CONNECTSYSTEMS (213) 37J.6803

INCORPORATED 23731 Madison St., Torrance, GA 90505

-••

rrl -

PRIVATE PATCH III frees you from member­sh ips, cliques and other hassles common tomany repeater eutopatcnes. You can call whoyou want, when you want and for as long asyou want. You can even receive your incomingcalls!

Wi th only three simple connections toyour base station radio, PRIVATE PATCHIII will give you more communicationspower per dollar than you ever imaginedpossible.

Suddenly the utility of your radio is drasticallyincreased. There are new sounds .. . di al tones,ring tones,CW ID and the sound of voices younever expected to hear on your mobile or HTrad io ! What a convenience!

Options:FCC approved coupler12 VDG or 230 VAG power

To Learn more about PRIVATE PATCH lit and the advantages of the VOX concept, call or write forour four page brochure today!

PARTIAL LIST OF FEATURES• OPERATES SIMPLEX, THROUGH REPEATERS, OR DUPLEX ON REPEATERS. VOX BASED. TOllRESTRICT (Digit counting ancl programmable first digit lockout) • SECRET CODE DISABLES TOllRESTRICT FOR ONE TOll CAll-Automatic re-arm • AUTOMATIC BUSY SIGNAL DISCONNECT• CONTROL INTERRUPT TIMER (Maintains positive mobile control) • CW 10 When you connect again ondisconnect. Free 10 chip. • SElECTABLE TONE OR PULSE DIALING. MOV LIGHTNING PROTECTORS.THREE DiGIT ACCESS CODE (e.g. * 91) • RINGOUT (Reverse patch) Ringout inhibit if channel busy.• RESETTABlE THREE MINUTE TIMER. SPARE RELAY POSITION. 115VAC SUPPLY

DEALERS

ONLYPRIVATE PATCH III

GIVES YOU ALLOF THE ABOVE

• One year warranty.• A patch should work with any

radio. AM , FM, ACSB, relayswitched or synthesized.

• Patch performance should notbe dependent on the TIA speedof your radio.

• Your patch should sound justlike your home phone.

• There should not be any sam­pling noises to distract you androb important syllables. Thebest phone patches do not usethe cheap sampl ing method.(Did you know that the competi ­t ion uses VOX rather thansampling In their $1000 COf1'l.

mercia! model?)

• A patch should disconnectautomatically if the numberdialed is busy.

• A patch should be flexible. Youshould be able to use itsimplex, repeater aided simp'or semi-duplex.

• A patch should allow you tomanual ly connect any mobile orHT on your local repeater to thephone system for a fu llyautomatic conversation. Some­one may need to report anemergency!

• A patch should not become er­rati c when the mobile is noisy.

• You should be able to use apower amplifier on your base toextend range.

• You should be able to connecta patch to the MIC and EXT.speaker jack of your rad io for aquick and effort less interface.

• You should be able to connecta patch to th ree points insideyour radio (VOL high side, PTT,MIG) so that the patch does notinterfere with the use of theradio and the VOL and SQ. set­t ings do not affect the patch.

• A patch should have MOVlightning protectors.

· Your patch shou ld be made inthe USA where consultat ionand factory service are immed­ate ly available. (Beware of aninferior offshore copy of ourfanner PRIVATE PATCH II.)

ISSUE . 305

for dio@A m a t e u r s

FEBRUARY 1986

K1NYK. . . . . . .. . .. . . . . .. . .. . .. . .. . ... . - . . . . . - . . - . . . . - . .. . - - . . . .. . - .

10 Razor-Sharp CWHere's a filter for tcocncs-cor is 80 Hz 100 wide? N6H1

16 New Hand" for O ld Rig~inte rnet Of external. converter or trcnsverter. here's how to odd three WARe;bands 10 you r favorite radio. . , .. , .. , , .. ,., , GW3SB

20 Razzle-Da zzlin ' Your AzdenSome sleighl-of·lxmd wifh a fistful of ports will make yOUr PCS-2000 a 2mstcn K7UK\N

VIC RA~lification: Part IIIThank W6LOB for the memories. , .. , , . . , .. , , .. , .. , . , .. W6LOB

Yeste r-day's Circu its TodayRemember tubes? W6HDM does. He's resurrected a hal1 dozen of his favoritecircuits and ocooteo them with semiconductors. . _. . _. __ . _. __ . _.. W6HDM

Up, Down, a nd All Arou ndFit your KDK 2016A with this ten-dollar SCan Con... , .. ,. , ..... , WA2AXO

Hu iltl It Dyna mic DuoAdd a speokerrrrske and a 12-V adapter to your HI VE1VQ

Scanning the T R.2400A simple mod for lazy hams-pUsh the button and it scans! WB81KO

The RIT SluffClarify your FT-101E's reception with this five-component modification .

Rebirth of the Eico 22 1Turn this Ilea-market regular into a super-sensitive voltmeter. Then count themoney you saved, , . . , , , .. , .. W5VTJ

Super-Selectable Bandpass FiltersPA0SE uses extraordinary methods to cratt the ultimate l-I filter . . PA0SE

Cur-ious About Code'!learn (or improve) Morse from your TRS-80! You'll never find a more patientteacher. _ _.. _ , .. , , , L.ewart

62 WARe, Re,', and "layAdding 1Q-MHz capability to your Yaesu FT-101Z is a simple step-by-step pro­cess. In just a few hours, you can join the fun on our newest amateurband _. __. __ . _. __ . _. _ K7KQ

On the Cover:Design by Art DirectorDionne Rifson.Photography byFrank Cord elia,Bennington NH.

26

28·1 \\llar!• QKX•

66 J'\"e ,,' Pr-nducte 3667 run!68 Sale llile" 4068. 80 lIam lIelp69 Barle r .;\. Buv

4270 Spt"cial E'...nl....72 Rt>\·iew

74 Ahon' nml Beyond 44•• I...Ue n, .>76 Rrn' Loop82 Co nh· ,.I" 5184 QS L or the ~Iollth

88 7.1 Inft·rnational91 Heal ..r Uireclory 5491 Peopegetion

95 J.j",1 or A.h·erli"en 60

Edltonol OIlices: Plne SO-_ " " " OO""l7' NM Cl3<I68 . .",...... /lOJ-924·04.11 Advertising oeees- ,1m _, ....,a OOOUQl> ,.... Q3.IIM, pI>ooo> 6OJ-924-7 ,3e ClfCUJatlon OtIices: ~Im_....... OOougn,.... Cl3<I68 .",......~4·947 ' t.4onU$Cl ipt$:~ boT> '"~_~a>O/OI' """. O'e <710 "'COI_ &:> "" _ ,_ ~ ~,.., ' __ "" lOoI '" '" 0fY< " _.-.00- a ,.,., n ' ' '-'' _ .acf'I -' 1 •~ "" d 0fY< "' ...

". madOO <DOtl "" ..,. .....~ ",..".." ". GIOOec_ "' fJ -=-~ 10 _ la.- T~~ G"4O~~ _ us.,..... muof r.o:t..o. ~

.......-<>a< _ ...... ,._~ SubsCflpllOl'l lnk:lfmofJOn: llaOI4 ........, ~<710 '"= •• 0. ...... (' 2~ ~2497. 1...., V«nf24 -.-j S3&OO; _ V«n (J6~ $MOO

(I....... Ca>a<>a <710 """""",,"S2797/ '.-oJ oNy. US fIIr>Os f<nogn utooa .......S449711.-oJ oNy. US 1\IIdO.,.",... on US DaN< Fcw*'Q'l QoI moo .....~ b~. _ '"~ on adOt... W"", 10So.Clct~ Dw><>h,oem. 1'O !lo> 93',~ NY " 737 Sooncl CoOGlOO:Jil C"""I/44 '"~ ",. 73. PO b 10M . for! Ena.~~ l2A _ . -.... """*""'"""""on_ for ,-...aI, andc~ d """'.... if>CMHo ",. Oddt... lot'*' hom >OUI" most """"', ...... d 73 k;If g<If l>Jt:>OC1 op"",,,,-~ yO<J1l'>Om* ond 000"... 01 _ 01_ "' II"'~"

for <lU*"""" C<>">Ce<.-.InQ v<Juf lUtltC<oc!lon end 10 pIoce o<.oblcripllon "'_ ', pIaO,* cal \II IQiI h... at 1·&00-645·~ """"'-' 9 om end S pm '" ""rtIe to 13. Suboc.1p!ion~. PO !lo> 931,~ NY ' 1737 7J la.- _ Nno'*<n (lS9'< 014XlllOJ<1 ..~ """""'" "'" ON~' .-.c . eo _ S>r_. f\tIeoIttoougfl ~ 00458 Soccn<l <:taM pClSlage f>O'Cao "". 'OOougfl "'" Q3.IIM <710 CJf ,... .,. rncsolonQ _ ~ --'" <:taM moo ""'..aoo,......-oar~ fnIo«t "",.",." """""""fCl 1f1l111.ON~' w: .. .;gr.tl.--.... ""> D<lI1 "' D ....,.,. be 'wo ' '''''' "' _ ~ ........., _,,-. • ...,.,., ~ _ ~__ ""' iVDaI'" 4&'(1() PuIa'''-Sooncl <><»-u "' ''' oga\ 10 7J ""__ s<.c»::o....' _ PO _ 93' . Fcw".Q1ala NY " 731 ,....... ..,."~ "'" .... ,...........~~

73 for Radio Amateurs • February; 1986 3

•

TAFF

PUBlISHERJohn C. 6umaft

FOUNDERWayne Green W2NSOIl

MARKETING M...N....GERHopeCunier

ADVERTISINGl.eoo-«l~

SALES MANAGERJim Gray W1l!U

ASSISTANT SALES MAH...GERNan.cyCIiIlmpa

EXEClITrvE EDITORSusan Ptl i lbrick

MANAGING EDITORSt_ J"*,,tf KAUolPM

TECHNICAL EDITORPl:Ir<y Donham KW10

ASSISTANT MANAGING EDITORChrli Schmid t KAIMPL

INTERNATIONAL EDITORRlchafd Phoenl.

EOfTORIA.l ASSISTANTCarola Macloel

"'RT DIRECTORDianne Ritson

DESIGNERSu" Haya

ASSOCIATESRoberl 6aker WB2GFE

John Edw ardS KI2IJBilt Gosney KE7C

Or. Marc w...ey WA3AJRBill Pasternak WA6ITF

Peter Stark K2C»WPlel'" Pufman KT2B

GItAPfoiIC SERVICES DIRECTORCI1risline Oest.empes

GRAPHIC SERVICES MANAGERDr:!nni l Christensen

MANUFACTURING MANAGERSusan Grol S

TYPESETTING SUPERVISORuncsa P. Canale

SYSTEMS SUPERVISORAndrea FIo<ence

PRESIDENTICEOJames S. swee

VICE PRESlDENTIf'INANCERoger Murphy

VICE PRESlD£NTIPlANNING AND CIRCULATION

William P_Howard

BUSINESS MANAGER"'all Srniltl KA IlEI

CIRCULATION MANAGERFr.nk Smllh

DIRECT AND NEWSSTAND SALESMANAGER

Ralno Wirlin1-flOO.343-0728

DIRECTOR OF CREDIT SAlESAND COLLECTIONS

William M. 8oye<

News from WI XUHAT?

As t wrl t ~. Halley's Comet has ' ''''!:lolly made It , once-ilHl-IU" lIme rea p pea rance in the nigh t s~y, a nll a lo t o r exIraat tention by astrooome,s, photographe,s, and even the man in the street Is being focused on tne heavens to ca tch aglimpse a l tlli, Infrequent vis itor toou. sola. sysle<rl . II seems appropriate. therefore, 'o tal k • lillie a bout the sola, systemand its relahonship to amateur radio.

Hams .'en"l . lf8nge<Wo 10 the space &urround,ng the sun and p1.~s. lor we·... bounced t.ignal, 011 U.. moon. relayedmfIS5aOIIS by ..teliite. -.rid propao;Iled •..,io*_l h 'OUQh Earth",lQnospMf• . For year$ we·... known aboullhe SUfl$POtc yc le and ill efffOCt 01'1 radIO Pfopagahon., higl'l l .equenciH. and we'"" been aDlfI to calCulate seasonal and daity va ria­lions in the MUF which . Ileelthe likelihood 01one blond Of anon,or being opotn between two locations on E.,lI•. ""houghlWICessary. such InfOlmelion Is by no means sufficient, because 11 does not take In10 accOtlnl the day·by~ay ecoenrce 01Earth's magnetic fie ld wh ich so drastically Infl uences our atlli lly to communicate.

The late John Nelson, who prepared propagatlo<1 forec asls lor 73 l or SO many years, was amo<1g Ihe Ilrslto suspecl (andl inally ulilizellh" surp<ising influen.ce of pla""ta<y posi tio<1S 0<1 p'opagal ion to make his lISto<1lshingly 8O%·accural. p'.diClionS. Beeau!le Earth 1. b.1I thed by SOlar radialiOn .nd, in facl, Cilll be consklered 10 be wilhln l he $OI.,sphera. ion<>spheriC Pf09&Q8tiOn 0<1 Earth Is compllCaled by the • • , remel y variable and often unpredictable nalu<e oJ lhoe sun, whOMnuances 01 befta~ nave such a powetlul etreer on communications. Sunspoll, $OIar fla' .., COfONII holes, anCI other'

major .........t l on l he sun nave long been associalad wilh ' ooio propagation and, in recenf .,..,.,110, have been repofted 'ItO""larty by l he Space Envi,onmenl ServIceS Cenl erol Boulder, Colorado, in ifs *"",Iy report, Pr./lminllry~portand For.cul01 Solllr GfIOp/ly.icIII 0.'11, This magnificenl and e.tremely valuable pub licaliOO ia avallaDle fO anyooa lor fhe aaking: IIcatalog a hOmly SOlar eveOls OVer a period 01 daya , You can lind ecc n phenomena as 2800-MHz solar lIux, sunspof count,A and K magne tic Inde . es, nares. and omer Info rmation of vltallntereSlto radio communlca to.a.

For the PllSt eighl yea'a I have kept almost dal ly recoeds of sola' events 0<1 a chart wh ich also In.cludas fhe plaJ'llla<y

alignmentl. NOl long afl'" I began reco<ding, I noticed that cerla'n allgnmentl seemed to have a marked elleel on P!'opa.galiOn_In partiCuta'. sharp fluc tuatiOns and sudden jumpa in fhe magJ'lltic"ieId index appNored 10 be associafed wl1hspecific alignments, partICularly quadr atu<es iIlnd in fenor~pet'io< conjurv;tlons belween acme oJ the plaJ'llls iIlnd the sun.01 ......... g,eat.. interest baC.ause 01 itl implicalions. lher'" se emed 10 De a relationship DalWMf! the posi tion ollhe pl_Sand major or CiIl t...trophic~ts 0<1 Earth sucll ... voIc&nic erupfio<1s, earlhquakas, and even hu' ricanes, Now, I use chartsp'epa'ed sew",at monfhs ;n advan.ce to produce tM monfhly propagafion Icree"'fs In 73.

I feel obliged, in all hOnelly, to 'lOIl1ark fIlal I have not p,oved anything, altllough I think Illave l ound aome in ta.aatlngalld potentially importanl co"elet ions. There is no consensus among observerl and scientl st l abou t planata<y Inf luenC" I ;in fact, most pooh.pooh tham. Neverlhei ess, i t seems possi tl le to me that the planets may "modulate" Ihe sun's el'lCt ro­mag",,' ic tiald in a manner simila' 10 the moon " modula l ing" Earl h's gra"i l aUo<1al lield and affec ting the l ides.

Perhaps it would be of Inter",,' lo fol lOw" an """"'9l. o'lhe charting p<ocesa trom wtlich I ma~e the prediclions. USIngr". A.tronom;r;a l Alma,,1IC tava ilable trom the US Go¥emmenl PJinlong Oll~), I millke ill simple g,aph wtlich has <leg'''"

on Its horlzonlal base'llne and da~ oJ lhe month along ilS ¥eIlical "'" marglfl. The <legrees run from 0-90, 90-1110, 180-210,anCI 210-360. WIth eaoch 9O-degree .ange ly ing exactly underneath lis neighbor. In Ihis way I can obtain quadrat ures (90.<leg,.... ralation$hipa), in 'arior co<1jurv;fiona p8O-degrea relation$hIPII, and superiOf conjuncliona «I4'lgree .alatio<1sh ipsj.I then read Ihe positio<1 01 aach pla""t hom l he Almanac and plot Its location in h" lIocentric degreea along the baseline'0< lhe l irst day of Ihe month and along lhe top Iina 'or Ihe laat day 01 the monlh. It is th"n a simpl" mailer 10 connectthese locations with a st,alghl lin". Where planetillry position lines Cross One iIlnother. thers is an align ment. and Iheirangul.. relation$hip is obvious.

Next. Ilaka l he day of . iIlCh alignment and place II on anolhe< tmall,,1) chart as a vert ical line acco<ding 10 the day onwhich it will OCC"'. The days run alOng tM abscissa on thIS ch.rt, .,.,1" ordinat.. rep<asenting values oJ sol.. fluK. mag­netic-field inde• • and the l,ke. The master charl ;s f l>e<l filled IfI w'lh tl>e data ... tl>e i..torma tion l>econ'WI$ ani labia f,omWWY or from l he prlllriousty.mentio<'oed Solar Geophy.ical 0.111. I pial the datas at moon per igee and full moon as _I..... l1er se'O'l'filll w""",,a 01plalling t"" dala points and conne<:ting them .,.;\h t"" various colored lines, one can ..... relatiOfl.sh Ips betWIleh SOlar (and Eanhlll'tflnls as Ihey eeeerce wit h Ih" p1"netaryllllgnmenla. I ha.., to admit that much 01 thiscan be (and probably has been) comput",ized to reduce the amou nt 01 tim& '&q uired to p,epare me charls.

The chart becomes a running r&Cord 01 ""anta ve' aus planeta<y pos it ions, "nd It Is fun to I "" the rel"t lonships developwith time, Fo' example , the eruplion 01 the volcillno in Colom bia On NOvember 13th coirv; ided with a 9O-<l<lo ree alignmentof Earlh and Jupi ter, an Inlerior con;unclion 01Eart h and Mercu<y, a 9Q-.Oegr" allgnmenl of Mercu,.,. iIlnet Uranus, anet a 9G­<legree alignment 01Maf10 and U'anus, Inte,estingly. the IUnspot count jumped from zero on " 'e 3.-d to 50 on the 13th and

73 for Radio ....mateurs Is ill memlle< 011"" CW Communicatlons/lrv;. group, fhewortd·s l iIlrgast publiSher oJ computer·'e1aled ;nfomuolion. The group publ ishfls57 compul.. PUbliCations in _ than 20 mat<-' counlries. Nine million people

read one or mor" 01 the group's publications eaoch month. Memba<s oJ the group;rv;lude: Argent ln.&'s Compu!e<wolfdlArg<mtina; ....sia·. r"" Asian Compul..-wond; Aual ralla' , Computerwond Au.tr. ,ia,AU. " lI l illn PC World. MIIC..orlrj and Oi"",'or'e.; BrllZil' s Olll aN" ... and MicroMunrio; Chi...·• Chinll Compul&rworld; De...mark' s Compulerwor /d/Oanmarlr, PC World and RUN (Commodore): Finland's MIAro; France 's t e Mo"d" 1" l ormlll iq"",Golde" (App lel. OPC (IBM) and DlstrlburiQue; Germany's Compul"rwoche. Microcompuler..ett, PC We/l. Solt..a",Mar."CW Edl tlon/Semlnar. Computer SUslness, RUN and ....pple·s; Italy's Compu terworld /lalla and PC MagaZine; Japan's Com·pUlerworld Japa,,; Medco 's Computerworld/Me_/co and Compu Mundo; The Netherland 's Compurerworld Benelux and PCWorld BeneluX; Norway's Compul _orId Norge, PC World and RUN (Commodore), Saudi Arabia 's saudi Computerwortd;Spain 's Compulerworld Espana, III lCrosistemllsIPC Wand, CommoriOfa World; Sw«len 's CompuretSW8riM, Mi.roriaro",and SO'e'fIsU PC; lhe UK', Compu t...- III II~I, Compul...- N" .... PC BuaiMU Wand and Compure-r Business Eu!W»;V~a'i Compulrtrwor#d V"""zue,,; lhe US's ComPUterwond. HOI CoCo, mOder, I"Iowand, IIIIJCWorId. Micro Marllet·worI", PC World, RUN. 73,80 Micro. Foeu. PUblicat"",. and On CommunicllliQrla.

4 73 fo r Radio Amateurs· February, 1986

. -,Ill ~ r:"--- --.' -

Optional accessories:

• AT-940 full range (160-10 m) automaticantenna tuner . SP-940 ex ternalspeaker with audio filtering . YG- 455C-l(500 Hz), YG-455CN- l (250 Hz),YK-88C-l (500 Hz) CW filte rs;YK-88A- l (6 kHz) AM filter . VS~l voicesynthesizer . 50-1 tem perature

com pensated crystaloscillator . MC-425 UPIDOWN hand mic.• MC-BOA, MC-BO, MC-B5deluxe base station mics.• PC-1 A phone patch• TL· 922A linear amplifier• SM-220 station monitor• BS-8 pan display• SW-200A andSW-2000 SWR andpower m eters.

TRIO -KENWOOD COMMUNICATIONS1111 West Walnut StreetCompton. California 90220

More TS-940S information is availablefrom authorized Kenwood dealers.

KENWOOD

• Low distortion transmitter.Kenwood's unique transmitter designdelivers top -quality Kenwood" sound.

• Keyboard entry frequency selection.Operating frequencies may be directlyentered into the TS~940S without usingthe VFO knob.

• Graphic display of operating features.Exclusive multi-functionLCD sub-display panelshows CW VBT. SSB slopetuning, as well as fre­quency. time, and AT-940antenna tuner status.

• aRM~fi9htin9 features.Remove "rotten QRM" wIththe S5B slope tuning, CWVBT, notch filter, AF tune.and CW pitch controls.

• Built - in FM, plusSSB, CW, AM, FSK,

• High stability, dualdigital VFOs.An optical encoder andthe flywheel VFO knobgive the TS-9405 a cost­l ive tuning ' teel"

• 40 memory channels.Mode and frequency maybe stored In 4 groups of10 channels each.

• General coveragereceiver.Tunes from 150 kHz to30 MHz.

.1 yr. limited warranty.Another Kenwood First.

Camplere servlt:e manuals are availaOie fOI a' TrIO -Kenwood transcervers and masr accessories5pecfftcarions and prICes art' subjt'ClIO r;;flange ..."flO(Il rtOllCe Of ObIlgaIIOll

T8-9408The new TS-940S is a serious radiofor the serious operator. Superbinterference reduction circuits andhigh dynamic range receiver com­bine with superior transmitterdesign to give you no-nonsense, nocompromise pertormance that getsyour signals through! The exclusivemulti-function LCD sub displaygraphically illustrates VBT, 5SBslope, and other features.

-'00% duty cycle transmitter.Super effic ient cooling sys tem usingspecial air dueling works with the inter­nal heavy-duly power supply to allowcontinuous transmission at full poweroutput for periods exceedmq one hour.

• Programmable scanning.• Semi or full break-in (QSK) CW.

Comolete setVlCe manuals ale avaolaOle-Ie- a' r"o· Kenwood eenscewe/s and mosr accessoriesSp«dlCarf()t1$ and ()flCes ale SUb}eCr 10cha~ Wtthour notICe 01 Ob/Igallon

TRIO-KENWOOD COMMUNICATIONS1111 West Walnut StreetCompton, cahlorma 90220

'"•

KENWOOD

Optional accessories:• PS-430 compact AC power supply• SP- 430 exte rnal speaker . MB-430mobile mounting bracket . AT-130compact antenna tuner cove rs 80-10

meters, inc I. WARC bands• AT-250 automaticantenna tuner covers160-10 meters. incl. WARCbands . TL-922A 2 kWPEP

linear amplifier . FM-430FM unit . YK-88C(500 Hz) or YK~88CN

(270 Hz) CW filters• YK-88SN (1.8 kHz)

--......... narrow SSB filter . YK-88A(6 kHz) AM filter . MC-42S

UP/DOWN hand rrnc. • MC~60AJ80/85 deluxe desk mics. • SW-2000 /

200A SWRfpower meters . SW-100ASWR/powerl vo lt meier . PC-1A phonepatch . HS-4 , HS- 5, HS-6. HS-7

headphones

• Reliable, all solid state design.Solid state design permits input powerat 250 watts PEP on SSB. 200 watts DCon CW, 120 watts on FM (optional). or60 watts on AM. Final amplifier protec­tion circuits and a coolingfan are bui lt-in.

• Memory channels.Eight memory channelsstore frequency. modeand band data. Channel 8may be programmed forsplit-frequency operation.A front panel switchallows each memorychannel to operate as anindependent VFO or as afixed frequency. A lithium battery backsup stored mformation.

• Programmable, multi-function scan .• Speech processor built -in.• Dual digital VFOs.• VOX circuit. plus semi

break-in with sidetone.

TS-430SDigital DX-terity-that outstandingattribute built into every KenwoodTS-430S lets you asv from band toband, frequency to frequency andmode to mode with the speed andease that will help you earn thatdominant OX position from theshack or from the mobile!

"

• Covers all Amateur bands160 through 10 meters, as well as thenew30, 17, and 12 meter WARe bands.High dynamic range, general coveragereceiver tunes from 150 kHz to 30 MHz.Easily modified for HF MARS operation.

• Superb interference reductionEliminate QRM with the IF shift andtuneable notch filter. A noise blankersupresses ignition noise. Squelch, RFattenuator. and All are also provided.Optional IF fillers may be added foroptimum interference reduction.

EDITED BY PERRY DONHAM KWIQ

DXCC + 11

AM Appeal

SPEAKING OF sin g le-s tation countr ies,wh y not add t he c o uncu o f Eu rop ea nHeadquarters in Strasbourg, France? GusBrowning , in his DX 'ers Magazine, saysthat the stat ion wi ll have extrat erritorialstatus, just like all 01 the Un ited Nationsbuild ings. Look for the prefix TP21 - l'msu re the OXCC desk will be eager to add a" new one." Gus also mentions that VK3SXis looking for just a few more states tocomp lete WAS on 40m: Arkansas, Dela ­ware, Hawaii, Idaho, Nebraska, Nevada,New York(! ), North Dakota, Oklahoma, Or­egon, and West Vi rgi ni a. Want to help himout? Drop a line to Bob Robinson VK3SX,81 Bishop St., varravme 3013, Melbourne,Australia.

Opening

THE US COURT OF APPEALS has uphelda decision by the FCC which se ts the max­imum amateur output power at 1500 WattsPEP. Glenn Baxter K1MAN fough t the rulein court , c laim ing that it would adverselyaffect double-sideband operat ion by na!v ­ing the maximum output (currently it is3.000 Watts-the Com mission has post­poned the implementation of the 1500­Watt rule for DSB until 1990). Baxter cannow appeal h is case only to the US Suopreme Court.

OSCAR Orbits

73 MAGAZI NE has an opening on the edi­torial staff l or a Technica l Editor. If you areinterested in living and worki ng in the ta x­f ree hills of New Ham psh ire, send your reosume to 73 MagaZine, Editorial Offices, 60Pine Street , Peterborough NH 03458, Attn:Jack Burnett.

The shack at 4UJUN.

•

At Together Now

his ability to copy code. Said the comrme­sian, " That requ irement is so bas ic to theAmateur Service that waivers of it are notgranted."

Winner

COMPLAINING THAT, " Alabam a has beenmade an island," repeater owners in thatstate have petitioned the Caroli na VirginiaRepeater Association (CVRA) for member­ship. Several months ago the Alabama Re­peate r C o uncil di rec ted all r ep eate rowners to move immediately to a 2Q.kHz­spaci ng plan or lose their coordinated ete­tus ("QRX," June, 1985), even though su r.round ing states use a 150kHz plan. No wthe owners want to be coordinated on a re­gional rather than state basis, and areform ing what will be the Alabama districto f the CVRA . If the CVRA approves the pe­tition , a thorough survey will be taken of allrepeater operators in the state to det er­mine whether or not a move back to 15-kH zspacing will be made. The CVRA coord i­nates repeaters in Georg ia and Tennesseeas welt as the Carolinas and Virginia; Mis­sissippi also is considering join ing the or­ganizat ion.

INADVERTENTLY LEFT OUT of our 198575m World SSB Championship result s wasOr. Max de Hensel er HB9RS, president o fthe United Nations Amateur Rad io Club.Max pi loted 4U1UN to a Class A Single-Opwin with 520 QSO points and 22 multipl iersfor a total of 11 ,440 points. Max wi ll receivea certi f icate for being the top scorer in hiscount ry (in lact, 4U1UN is the only stationin that country...a guaranteed win!). Bythe way, it you contacted any two o f thethree UN " countries" last year, you are eli ­g ible fo r the United Nations at 40 Award .(The three call s are 4U1UN United NationsHeadq uarters, 4U11TU Geneva , a nd4U1VIC Vienna.) Drop a note to any o f thethree at it s cenooo« address.

•RX.New Sats

Ham Stats

THIS MONTH should see the launch 01 twonew Soviet amateur satellites, AS-9 andRS-l0. Both will be in orbi ts similar to thecurrent set of AS satell ites, wi th a periodo f about 2 hours . RS·9 will carry only aMode A transponder (2m up, 10m down).AS-1 0 will have three transponders: ModeA, Mode K (15m up, 10m down), and ModeT (15m up , 2m down). The 2m beacon w illbe at 145.557 MHz. Also expected Is theejection of ISKRA-4 f rom the space stationSalyut·7; the satelli te will carry a Mode Ktransponder and will c i rc le the earth every92 minutes for just a few months.

Waivers Waived

THE LATEST FIGU RES released by the In­ternational Amateur Radio Union (IARU)concerning the number of licensed arna­teurs in the world are very interesting . Inorder o f ham populat ion, the top ten coun­tries are: Japan (no surprise there!), theUnited States, the USSR, Brazil, the UnitedKingd om, t he Federal Republi c 01 Ger­many, Italy, Spain , Argentina, and Canada.I wa s really amazed that Yugoslavia orCzechos lovakia wasn 't right up there­seem s like every time I tune across 20 me­ters the band is just full 01 OKs and YUs!When ran ked by the number 01 hams whoare members 01 their national society, thelist looks like this: the Federal Republic ofGermany on top with 77% , the UnitedKingdom in second place with 51% , Spainright on the UK's heel s wi th 50% , Italy wi th37%, and the United Stales in fi ft h placewith on ly 27 %. All told there are 1,511,000amateur-radio operators in the world.

THE FCC HAS DENIED two request s fo rwai ver s of the rules coverin g vol unteer ex­amination s. J im Gustafson SZ4JD askedpermission to conduct an exam sessionwith one Advanced- and two Extra-classhams (the rules require three Extras). In de­nying the pet it ion, the Comm ission said ," To establish such a precedent by waivingthe requ irement could easily lead to manysim ilar requests, all of which would at ­tem pt t o sh ow a unique c i rc ums tancewh ich would tend to make compliancewith the three-VE requi rement a hardsh ip."(Ever not ice how it takes the FCC a fullparagraph to say, " No"?) John MulvilleKA0TNS f il ed th e other request . He askedlor a wa iver 01 the t a-wom Morse test, cit ­ing a medical cond ition that would im pai r

PROJ ECT OSCAR has prepared a com­plete set of orbital predict ion s for 1986.The tables li st the time and longitude lorall nortn-to-soutn equatorial crossings 01RS-5, RS-7, and the two University ot Sur­rey sate llites (OSCAR 9 and OSCAR 11).A lso, the t ime, sub-sate ll ite lat itude andlong itude, and argument o f perigee areg iven for the apogee of each orbit ot AM­SAT-OSCAR 10. Project OSCAR also hasprepared The AMSAT Phase 111 SatelliteOperations Manual, a rtc-cece book cov­ering operating procedures and technical

73 for Radio Ama teurs · February, 1986 7

----~---""'""----

details of the new series o f OSCAR satet­lites. The orbi tal list ings are available for a$ 10.00 donation and th e m a nual l or a$15.00 donation: Send your o rders to Proj­ect OSCAR, Inc., PO Box 1136, Los AltosCA 94023.

QSL Liberty

THE FIRST ENTRANT I' ve seen In theSt atue-ot-U berty-Cen ten nial·aSL depart­ment is a reatly nice one from AI La VorgnaWA200J . AI's card is 8 · x 10· .. and youcan get one by working WA20QJ any timeduring 1986. AI says that he is RnY-act iveon both 20m and 2m and al so is on packet.Anyone else issu ing a commemorativecard this year? Let me know!

MetroSat

WHOEVER IT WAS that came up with thename " Am ateu r Radio" m ust be doingsome double takes these days-our hobbyIs far f rom amateur! And just when youthought packet radio was the hottest itemon the ham menu, along comes the Metro­plex Network. The Network is a satelli te­based news system designed expressly foramateu r radio . Three prog rams , co-pro­duced by Metroplex and Wesllink Radio,are now being transmitted: a weekly newsshow, a weekly sweo-enc-shcc service,and three Nort h American Tel econferenceRad io Net s per year. Aff iliated c lub sta­tions can downlink the shows from a com­mercial satellite transponder for a fee,receive them via a UHF link, or connect toth e network over the telephone. A newpackage is avai lable every Monday night at10:00 pm EST. A lex Magosci WB2MGB cangive you more details about network attru­ation-get in touch wi th him at the Met ro­plex Network , PO Bo x 237, Leo n ia N J07605, or call (201)·592-7614 lor a tapedmessage.

On The Table

YOUR CHANCE to get a real picture ofComet Halley taken from a real observa­tory by a real astronomer is coming up thismont h. Jim Young WB6FNI, resident as­tronomer at the Jet Propulsion Laborat o­ry 's Table Mountain Observatory, willcommemorate the celebrated slush ball byoperating from Table Mountain during Feb­ruary and March, 1986. J im says that thi swill be a tcrtv-meter-cmv affai r and will bedone on a noninterference basis wi th nor­mal observatory activities. Frequenc ies (inMHZ), modes, and times (in UTC) are: 7.120CW 0400-0500, 7.22817,077 SSB (spli t forOX to Europe and Africa) 0500-0600, 7.249SSB 0600-0700,7.249 SSB (on the Triple-HNet) 0700-0800 , 7.228 SSB (looking forSouth Pacific, Australian, and New Zea­land stations) 0800-0900, and 7.22817.084

8 73 for Radio Amateurs • February, 1986

"'"''1111100'"

AI WA20QJ 's commemorative OSLo

SSB (Split fo r OX to Asia and the Far East )0900- 1000. J im will answe r yo ur aSL wi tha certi ficate an d an o r iginal Ha tle y ' sComet photo taken from the Table Moun­tain Observatory. Send your card and a "10SASE (with 4ln postage) or 5 IRCs to J imYoung WB6FNI, PO Box 576, Wrig htwoodCA 92397.

Pollish Hams

OUR 6TH ANNUAL " Fun!" poll is here!Conducted by columnist John EdwardsKI2U , this year's survey probes the couec­uve psyc he of ham rad io with questionssuch as, " Should hams be subject to pert ­odic retesting?" and, " Co you th ink netshave a place in ham rad io?" This is yourchance to direc tly effect changes in 73­we take the results of this poll very sen­ously and use them to determine Just whatit is that our readers want to see in themagazine. This year, you can send your an­swers t o Jo hn elec t ro n ica lly th ro ughCompuServe (70007,412) o r Th e Source(CPA11?). See you at the polls!

Write On!

HAVE YOU EVER read an article in 73 andsaid to yourself, " Gee, I could do that! " ?You're right-you could. In fact, we're ask­ing yo u to write an article for us! And, as aspecial bonus for " QRX" readers, I'll giveyou a few insIde tips that will help sell yourmanuscript. First , pick a topic that hasn'tbeen beaten to death already. For exam­ple, a logging program for your computerprobably will not make the grade. steusu­cally, the most-accepted topics are an­tenna construction and modif ications.Second, include plenty of photoqrapha-c-agood picture can sometimes sell an other­wise dull art icle. Include captions for you rshots on a separate sheet, and tightly, w itha pencil, mark the back of each print witha letter or number. Third, be yourself. Justwrite down yo ur ideas as you would sayth em to someone standi ng in th e roomwith you-long words and complicatedphrases just make a manuscript hard tounderstand. Finally, if you can't come upwit h an art ic le, t ry writ ing a review. It

doesn't have to be a component -by-cern­ponent engineering ana lysis, Just a sum­mary of what you liked and disliked aboutthe product. Again ,lake plenty of pictures.If you want a step-by-step guide to becom­ing a 73 author, send an SASE to 73 Maga·zine, Edito ri al O ff ices , 80 Pine Street,Peterboroug h NH 03458, Attn : How toWrite.

Think Thinkers

THE COMPUTER MUSEUM in downtownBos ton , in conj unction with computer­Land and CW Comm unications, is search­ing for relic s left over from the early dayso f computing. They are looking . for justabout anything that smells of mold: kits,cards, one-ot-e-kinos. and memorabilia. Ifyour item is selected to become part of theexhibit on computer evolution, you'll re­ceive an invitation to the grand openingand a bound copy of the exhibit catalog. Ifyours is one o f the " fantast ic five" pieces,as determined by a distinguished panel ofexperts, the Museum will pay your waydown to Beantown (and home again) forthe big opening bash. Get in touch with theMuseum for an official entry form, or justmail a pictu re and a description of your en­t ry to The Computer Museum, PersonalComputer Competition , 300 CongressStreet, Museum Wharf, Boston MA 0211 0;(617)-426-2800.

Packet Paper

GWYN REEDY N1 BEL dropped by the ot­tree recently to tell us about a new mace­zine for packet-radio enthusiasts, called(app ro pr iate ly) Packer Radio Magazine .The magazine is an extension of the Flor­ida Amateu r Digital Communications As·scc te t ton'.s FADCA > Beacon (a 73Newsl etter of the Month winner) and willbe distributed nationwide. Space will bemade available in each issue for localc lubs to use; Gwyn says that this arrange­ment will let local groups use Packet Ra­dio as th ei r c lub "newsletter" and will alsokeep packet organizations around the USup-to-date on each other's progress. If yo uor your c lub is interested In Packet RadioMagazin e , get in touch wit h Gwyn atFADCA, rnc., 812 Childers Loop, BrandonFL 33511.

Friends

" ORX" was brought to you this month withthe help of the W5Yf Report, Amateur Sat­elli te Report, th e FADCA > Beacon, GusBrowning 's DX'ers Magazine, and West­link. Don't forget to send your news itemsand photographs to 73 Magazine, Editor ialOffices, 80 Pine Street, Peterborough NH03458.

s!

• HI/lOW Power switch (adjustablelOW power)

• Compact DIN size

I~ll lntrodUcing ...£AJ Digital Channel Link

Compatible with Kenwood's DCS(Digital Code Squelch), the DCl systemenables your rig 10 automatically aSYto an open channel. Now you can auto­matically switch over 10 a simplexchannel after repeater contact! Here'show it works:

The DCL system searches for anopen channel, remembers it, returnsto the original frequency and transmitscontrol information to another DCL­equipped station that switches bothradios to the open channel. Micro­processor control assures fast and

reliable operation. The whole processhappe ns in an instant!

•••

Large neatsmk with buill-in coolingIan rrM -2570AI

ower-TM-2570Ah550A/2530ASophisticated FM transceiversKenwood sets the pace again! • Front panel programmable 38-toneThe all-new " 25-Series" brings the cress encoder includes 97.4 Hzindust ry's first compact 70-watt (optional)2-meter FM mobile transceiver. e 16-key DTMF pad, with audible monitorThere is even an auto dialer which • Center-slop tuning - anot herstores 15 telephone numbers! There Kenwood exclusive!are three power versions to choose • Frequency lock switchfrom: The TM-2570A 70-watt model, • New 5-way adjustable mountingthe TM-2550A for 4S·watts, and systemthe 25-watt TM-2530A. • Unique offset microphone connector• First 70-watt FM mobile (TM-2570A) - relieves stress on microphone cord• First mobile transceiver with tele­

phone number memory and auto­dialer (up to 15 telephone numbers)

• Direct keyboard entry of frequency• Automatic repeater offset selection

according to the ARRl 2-meter bandptan - a Kenwood exclusive!

• Extended frequency coveragelor MARS and CAP (142-149 MHz ;141-151 MHz modifiable)

. 23 channel memory for offset.freq uency and sub-tone

• Big multi-color LCD and back-litcontrols lor excellent visibility

Optional Accessories• TU -7 as-tone cress encoder• MU-1 Del modem unit• VS-1 voice synthesizer• PG-2K ext ra DC cable• PG-3A DC line noise mter• MB-10 extra mobile bracket• CD-lO call sign display• PS-430 DC power supply for

TM-2550A/2530A

• PS-50 DC power supply for TM-2 570A• MC-60A/MC-BO/MC-B5 desk rrncs.• MC-48 extra DTMF me. wun UP/OWN switch• MC-42S UPIDWN me.• Me-55 (B-pln) mobile mic. With time -out timer• SP-40 compact mobile speaker• SP-50 mobile speaker• SW-200A/SW-200B SW R/pow er meters• SW-10QAlSW-10QB compact SWRlpower meters. SWT-1 2m antenna turne r

Actual size front panel

KENWOODTRI O-KENWOOD CO MMUNICATIONS1111 We st Wal nut StreetCompton. Calitornia 90220

Complele servICe manuals are ava""ble lot an r"o -Kenwood rransce'vers and mosl" accesso"es$pecdlCallOflS and prICes are subteCl" to cfl.ilnge WoffJOul norICe 01 Obllg(lrlOfl

•

John L Rehak N6HI8701 Ma cA /pine Rood

C<Jrden Creve Ct\ 9164'

Razor-Sharp CWHere's a filter for fanatics -or is 80 Hz too wide?

the T5-4305 is shown in Fig.1. The circuit co nsists of fourstages of active bandpass fil­tering provided by two type­uA7 47 integrated-circu itdu al op amps and includes asim p le thre shold d e te ctor(d iodes D1 and D2) betweenstages 2 and 3 to reduce low­leve l background no ise .Each of the four filter stagesac ts as a narrow bandpassfilter with an audio band­pass centered at 750 Hz.

The fo ur stages toget he rresul t in an exce llent and ex­t remely nar row CW filterthat will pass a 75(}HI. CWnote with no attenuation butwill re jec t adjacent signa lsso well that an aud io notebelow 600 o r above 900 Hzcan barely be heard . The ac­tua l mea sured 3-d B band­width is on ly 80 Hz wide... truly a " razo r sha rp" CWfilter!

I st ro ng ly suggest usingpolycarbonate or other tern­pe rature-stable capacito rsfo r each of the eight .OO1 ~u F

ca pa ci to rs, with a ca pac i­ta nce tolerance o f ± 5% orless, to ensure that each ofthe four stages of filte ringwill be correct ly tuned toidentical bandpass frequen­cies . If you a re a rea l ca libra­tion fana tic, you can tweakthe band pass freque ncies ofeach stage by adj usti ng theva lue of its 27k resisto r. (In-

would have the spa re roomto install a good CW filte r. Ifound severa l good possibi l­ities and, for my unit. de­c ided on the a rea directlyunder the top cove r and tothe left . just in front of thefilte r unit (X51-129(}OO- seeinstruction manual , page 27).

Th is is a fine lo ca t io n aslong as you keep the CW filterboa rd lo w pro f il e (layresistors and " long" compo­nents down o n the boa rd ;don't stand them on end). An­othe r good possible locationwould be the space a llocatedfor the optional FM-430 (FMmode unit) -if you do nothave t he FM u nit in sta lledand do not plan todo so.

Circuit Detail s

The schematic dia gram ofthe CW filter I developed for

Sq ueezi ng In a Filler

W he n I u n packed m ybrand-new rig. I gave it onlya quick check to ensure thatits " stock" o pe ra tion waswithout problems before Iremoved the cabinet cove rsand sta rted sea rching for anarea with in t he rig that

fo r improved rece p tion . Itried thei r 2700Hz i-f filter.and a lthough it is nice as i-ffilters go, it is no substitutefor a good narrow active au­d io fi lte r. (Ha ving bo th isIdealf )

I have been building andusing active audio filters forCW rece ive rs fo r yea rs andhave long since recognizedthei r perfo rmance adva n­tages . I made the dec ision tomodify my T5-4305 even be­fore I purchased the rig.

00 ". ~ ". •• ". •• "..T

... ~~.o. .T ...00. ,r:- " ... 00• uo. ... ,

uo. • •0 • ' . Il 0 •" .. " & .u;7

..." ." '""'"1(2) ."• • •• • • • •oJ J,.. - ,.. m .~ m

h"·"Z· . &1UI_.• '0.-_

rm n ....

TO"or' .,H I~"OO "C I ~ IOOTPUTI

Fig. 1. Schematic diagram.

10 73 for Radio Amateurs . February, 1986

The Kenwood T5-4305 iswithout doubt one of

the best of the smaller mo­bile-size HF transceivers onthe ma rket today. With itsmany modes a nd lo g icalmemory-con trol operation,it is tr uly excellent for mo­bile operation . All of my op­eration is mobile ... and CWis my preferred mode. Mywork as a traveling salesmanrequi res me to spend manyhours behi nd the wheel ofmy car each week , and mymobileCW operations makethose hours fun instead ofboring!

With my primary interestbeing CWo I saw only onesmal l defic iency in the op­e ration o f t he T5-4305 onCW: Kenwood did not makea ny pro vision for install a ­tion of an active audio filter

$595.00 each$59.95 DTMF module

Have you been trawling the bounding main fo r a new product? We have justnetted it-the TP-38 microprocessor controlled community repeater panel whichprovides the complete interface between therepeater receiver and transmitter. Scutt le _ ~= ..:....individual tone cards. a ll 38 EIA standa rd .-CTCSS tones are included as well as rime and hit accumulators. programmabletimers, lone tran slation. and AC power supply at one low price of $595.00. T heTP-38 is packed like a can of sardines with features. as a matter of fact the on lyadditional option is a DTM F modu le for $59.95. This module allows completeoffs ite remote control of all TP-38 functions. including adding new customers ordeleting poor paying one s. over the repeater receiver channe l.

Other fe atures include C MOS circuitry for low power consumption. non-volati lememory to reta in programming if power loss occurs. immunity to falsing, pro­gra mmable security code and much more. The TP-38 is backed by our legendaryI year warranty and is shipped fresh daily. Why not set passage for the abundant watersof Communications Specialists and cast your nets for a T P-38 or ot her fine catch.

.JICOMMUNICATIONS SPECIAliSTS,INC.·"'=~({~I~~~~FAx~9ft~~296 ~ ~__ Entire US.A. 1-8Q0-854-o547

Operation

If you are not now used tooperat ing CW with a filtersuch as this one, you may findthat you will need to changeyour operating style just a bit.Th is filter is so narrow that ifyou tune rapidly across theband with the filter sw itchedin, you wi ll completely m isssome signals.

In my normal operati ngpractice. I tune through theband w ith the f i lter switchedout , then switc h it in w hen 1want to reall y focus in on aparticular CW signal Oncethat signal is in your filter,you can hit the f requency­lock button on your T54305and you really are locked onthat stat ion. As long as hedoes not have a f requencydri ft on hi s signal, you willnot have to touch your rigagain. a nd you w i ll m o stlikel y never hear any otherstat ions duri ng your enti reQSO unle ss y o u e lec t toswitc h the f ilter o ut to seew hat is happening aroundyour frequen cy.

Thi s modification has cer­tainly increased my er nov­ment of CW operati ng. andI'm sure you wil l f ind thathaving a filter like this inyour T54305 will encourageyou to operate a lot moreCW o If you also install theoptiona l Kenwood narrow i-ffi lter (270 Hz). the w inningcombination w ill o ffer CWselectivity second to none !.

(4) Disconnect blue wiref rom the ( +) side of the S­m eter. tape over the wireend so it w ill not short toanyt h ing , a nd tu c k in t onearby wiring.

(5) Connect an insulatedwire from the 5-meter (+ )

connector to i-f board con­nector 14, board pins 2 and3. This completes the instal ­lation.Note: In the T5-4305 instruc­tion manual. i-f board con­nector 14, in the i- f boardschematic, IC is shown in­cor rec t ly as being on pin 1. Itshould be pin 3 - as is cor­rectly show n on the mainschematic in the m anua l.

i1 y "un-modifv" the rig atany t ime in the future if youwant to sell it " stock" andkeep your super little f i lterto insta ll in a new rig.

The fi lter, as I installed it ,w ill modify the o peration ofthe front-panel A lC/IC me­ter sw itch so that i t becomesyour new audio f ilter in/outsw itc h. I elected to use th isswitch (leaving the t ransmitmeter permanently in the ICmode) because I never usethe A lC po sition anyway.Th i s is a very sma ll priceto pay to have the CW fi l­te r sw i t c h i n t he i d e a lposition!

You m ay prefer to usesomething el se, such as thenoi se blank er sw itc h, orwhatever, but using an exist­ing sw itch means you won'thave to d ril l any holes in thatbeaut iful front panel tomount a new o ne.

For the ac tu a l ci rc u it­board mounting, I took theeasy wa y out. Rather thandri lling holes, I just end osedthe circuit in a small plasticbag with the four intercon­necting leads coming outo ne corner and let the wholeassembly float in the left­rear corner of the rig. It isconfined in its location bynear by components yetcan't possibl y sho rt to any­thing through the plastic.

H ere is the in stall ationprocedure for the T5-4305 in5 easy steps:

(1 ) Unplug co nnector 4 onthe i · f board . Conn ectGround from the filter boardto pin 2 on connector 4. Re­move pin 4 f rom connector4 and connect board pin 4 toa long in sulated wi re and toInput on the filter ci rcuit.

(2) Unplug connector 14on the i-f board and connect:- connector 14 pin 1 to the

long insulated wire yo uconnected in step 1

- co nnecto r 14 pin 2 to co n-nector 4 pin 4

-connecto r 14 pin 3 to Out­put of filter circuit(3) Connect + 8 volts from

the fi l t e r c i rc u i t t o pin3 of connecto r 7 on the i-fboard.

INTRODUCTO};lYPRICE>

nal at about 750 Hz but re­jects it when you tu ne higheror lower. If all has gone wellso far, yo u are undoubted lyvery impressed with th is fil ­ter and your handicraft bynow. and you may elect tosto p right there and use thefi lter board w ith the nine­volt battery . Feel free to quithere and build the filter intoa sm all box to use as is w ithany rig and headphones, ifyou like.

• 12v·14vdc input• Charge (rom any i)olnl io

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creasing the resistance wi lll ower th e b andpa ss fre ­quencv.I In ac tua l practice,you will probably fi nd tha tthe fou r stages don't reall yhave t o be perfect . . . justclose enough so that all fourstages will pass the desi redaudio frequency of 750 Hz .

I const ructed my filter ona small piece of perfboard.w it h com pone nts o n o neside of the board and small­gauge insul ated wires form­ing all interconnections onthe reverse side. Installation

like me, you will probe-Initial Checkout bly prefer to build thi s filter

Afte r co mplet ing the cir- right into the T5-4305 sin cecu lt co nst ruc t ion. it would thi s saves having to carry anbe a good idea to verify the ext ra box with you and al-circuit's operat ion before in- lows the great conveniencestallat ion in your T5-4305. of a feature which can beUsing a 9-volt battery f o r sw i tched in and o u t a spower, connect the f i lter in- needed and will drive the T5-put to the rig's headphone 4305 spe ake r as we ll asou tput and listen to the til- headphones.ter output with high-imped- The installation I will de-ance he adphones, tuning scribe is simple and wi ll endacross a carrier or CW signal up with the fi lter o peratingto e ns u re th at the fi lter as if Kenwood had designedpasses a clean sounding sig- it in yet will allow you to eas-

12 73 (or Radio Amateurs · February. 1986

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" When You BUY, Say 73" 73 for Radio Amateurs . February, 19B6 15

.'

New Bands for Old RigsInternal or external, converter or transverter, here's how

to add three WARe bands to your favorite radio.

Fig. 1. Modified nio circuit of the HW-101. ThircJ.overtonecrystals are used, inductances wound on 7mm formers withturns spaced the diameter of the wire.

16 73 l or Radio Amateurs · February, 1986

to change the connectionsto allow transmission also.Many owners of popu larrigs, such as the FT-101 se­ries, have done so. However,some rigs provide for recep­tion of WWV on another fre­quency, and these rigs arenot so easily changed .

lt may be thought thatwith the low sunspot count,the whole of the 28-MHzband is not required andsome of these circuits canbe changed. This looks at­tractive provided that theswitching a rrangements al­low. I have found that mostrigs use a single set of induc­tors in some circuits for thewhole of the 28-MHz band.The a lte ra t ions wou ldtherefo re be extremely com­plicated, and a differentapproach would be mucheaster.

Although I have not triedit myself, the modificationof the Heath HW-8 shouldbe fairly simple. Becauseband changing is accom-

Charles Bryant GW3SBlC3SB2 Penrhyn, Saint Michael's RoadMinehead, Somerset. TA24 SjPEngland

W ith the 1Q-MHz bandin worldwide use and

more countries coming on18 and 24 MHz each week,now is the time to think se ri­ously about getting startedon the WARe bands - if youhaven't already done sol

The easiest way is to buya new rig, and many ama­teurs are doing just this, withthe result that there aresome very good five-bandrigs on the market at reason­able prices. However, it isnot too difficult to fi nd away of modifying an existingfive-band rig to cove r eightbands. The re are at leastthree methods of doing so,and this article reviews theadvantages-and the snags .

Internal Modification

The most elegant methodis to make an internal modi­fication, but this is usuallyquite diff icul t. If your rig is atransceiver with provisionfor the rece ption of WWVon 10 MHz, it is not too hard

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c rysta l an d tuned-ci rcui tswitches of the hfo and in­se rting a sma ll changeove rrelay to a llow either the ex­isting c ircuits o r new ones,contained in a sma ll exter­nal sc reened box, to be con­nected to the oscillator. Ifthe rig has a source of 12 Vde, there is no d ifficulty inproviding excitatio n for thi s

In side the box containing the new hfo circuits and switch.

73 for Radio Amateurs - Feb ruary, ' 986 17

The new hfo circuits and switch are in the small box to theright of the HW-101.

see n have a ll been designedfo r a powe r of 10 W o runde r).

External modification

This is the method I haveused and wh ich will , in mostinstances, prove to be theeasiest approach. The modi­fication consists of breakingthe connections from the

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the use of a converter infront of the rig is the obviousmethod. Circuits for con­verte rs a re common. l ABAK(in Radio Communication,May, 1983, page 427) a ndDl 1ZB (in SPRA T, Sum me r,1983, pages 9-11 ) have sug­ges ted that by using a single4-MHz crysta l, the 10- a nd1B-MHz bands a re coveredwith the main re ce ive r tunedto 14 MHz, a nd the 24-MHzband can be found with thereceiver tuned to 28 MHz .

At le ast for the CW oper­ator, it may pro ve easier tobui ld a sim ple CW tra ns­mitter fo r use with the ma inrig, p lus a conve rte r.

There is no rea so n why atransvetter should no t heused . For Q RP o perato rs th iscourse is possible a nd cir­CUIts have been published.As tran sverters a re re a llypracticable o nly at low pow­e r, this method is like ly toappeal only to the QRP fra­ternity (the circuits I have

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If you use a separate re­ce ive r (o r are prepared touse your existing transceiverin the receive mode only)

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Fig. 2(a). Tuned circuits (inductors omitt ed) of driver inputand output before mxJification.

plished by pu sb-buttonon/off sw itches combinedwith diodes. all circu its canbe isolated effectively whenall the bandswitches are inthe off position. Three morecomplete c irc uits can beconstructed and mou ntedon a boa rd fixed about % ff

below the existing PCB.Each separate ci rcuit shouldbe positioned as close aspossible beneath the corre­sponding one on the PCB. Itmay be necessary to makethe cabine t a little deeperand. of course, it will be nec­essary to add three newswitc hes w ith the ir associ­a ted diodes . Incide ntal ly,t he sa me ar ra n ge me n tcou ld be used to add the 1.8­MHz band to this popu larQ RP rig.

Fig. 2(b). Tuned circuits (inductors omitted) of driver inputand output afte r modification to enable 7 and 10 MHz to betuned with one inductor.

•

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Antennas

Having got your rig on thenew bands, there is no needto e rect a new antenna inorder to try it out. Use yourexisting 3.5-MHz dipole (trapdipoles a re not recommend­ed) or G5RV antenna. Thismay not be the perfect an­swer. but it will get you outon the bands.•

of warn ing: 8.6 MHz alsotunes at an intermediate po­sition. It is essential to makesure that the tuning is cor­rect before transmitting, anda simple test is available. Ifchanging the switch from" normal" to "10 MHz" doesnot affect the signa l bei ngreceived, the n the "driverpreselec to r" is w ro ng lytuned to 8 ,6 MHz.

I have had no diffic ultysi nce mak ing the or iginalmodification in 1981. andthe performance on the o ldbands (except the high partof 26 MHz) has not been af­fected. I should. however.point out that I work exclu-­sively on (VII; there may bed iffic ulties on SSB if the out­put c ircuit is not o ptimum.There is also the add itionalpoint that the tuning of 24MHz and 28 MHz in one c ir­cu it will result in a consider­able reduction of drive onthe highe r pa rt s of the28-MHz band.

I have described thismodification in some detail.and owners of HW-l01sshou ld have no difficulty induplicating my mod ifica­t ion. Owners of other equip­ment may well fee l encour­aged to atte mpt a si milar ap­proach.

Parts List

1- Aluminum box, 10 x 5 x 5 cm with lid and internal screen1- 3-bank. a-pcsttlon rotary switch with knob1- 18.895-MHz tn frd-overtcne crystal1-26.895-MHz third-overtone crystal1-33.395-MHz third-overtone crystal3-7mm coil formers with iron cores1-0.001 -uF capacitorl - 2O-pF capaci tor1-1()l}()hm resistor1-12·V operat ing miniature double-pole changeover relayMin iature coax and other connecting wire

soc ket of V19 as possible.The existing black lead pass­ing through hole Z on the" ba nd pass ci rcuit board"should be unsoldered andrerouted through ho le TP sothat it may be connected tothe relay. All the connec­tions to the relay a re thusquite short, and there shouldbe no appreciable change tothe operating cond it ions onthe old bands. Howe ver.some realignment is ne ces­sary before the new bandscan be tuned .

By juggling with the slugsin both sets of driver coils(L705. L704. L703. L702. L805•LB04, LB03. and LBOn it ispossible to tune to 24 MHzwith the "d rive r pre selecto r"near maximum capacitanceand 28 MHz with the capac­itor near minimum. Similar­ly. 18 and 21 MHz can becovered together withoutany d ifficulty. A problemarises on 7 and 10 MHz be­cause the capacitance swingis insufficient to cover bothbands . The so lution to thisproblem lies in disconnect­ing (703 from contact 9 ofwafer 3R on the "d rive r gridswitchboa rd" a nd joiningcontact 9 to contact 8, Simi-­la rly. (803 should be discon­nected from contact 9 ofwafe r 4R on the "drive rplate swi tchboa rd, " a ndcontact 9 should be joinedto contact 8. Although thissounds very difficult. aglance at Figs. 2(a) and 2(blwill explain what is involved.

These modifications al­10\'\1 7 MHz to be tuned nearmaximum capacitance and10.1 MHz near min imum ca­pacitance. However. a word

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relay. In the case of older plug-in crysta ls cou ld berigs, a couple of diodes and used if desired. The compo­a l ClO-uF capacitor can be nents in the other compart­connec ted to the 12-V heat- ment a re a ll supported byer line to provide the neces- their wi ring. The simplicitysary de. It does not matter of the circuit is shown in Fig.whether the positive or neg- 1. where component valuesative line is connected to are placed against new com­ground ponents and the existing

In Radio Communication components are shown withfor April. 1982. on page 317. the reference numbers givenI described my modification by Heath.of the Heath HW-l0l to in- The leads from thec1ude the three new bands. screened box to the rigThis is an expanded version should be as short as possi-of my original proposals. ble. The lead to the tunedOne advantage of this modi- circu it must be of miniaturefica tion is that it does no t in- coax, but the lead in the cvs­valve any mutil ation of the ta l c ircuit and the relay leadequipment, which can, if may both be unsc reened.necessa ry. be restored to its O riginally, I used coax fororiginal fonn. the crystal lead. but the ad-

The new bandswitch. with dittonal capacitance causedassociated components. is as- difficulties . To avoid drillingsembled in a small screened the cabinet of the HW·101 .box with an internal screen the leads may be fed throughbetween the wafers. The the ventilation holes in thesize of this box depends on bottom of the cabinet. Inthe size of the switch . I used operat ion, the box is placedwire-ended crystal s whic h alongside the HW-l 01 .were soldered directlv onto The relay is positioned asthe switch, but soc ke ts and near to the underside of the

18 73 for Radio Amateurs · February, 1986

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f ig. 1. Original memor y-protection circuit uses threesilver-oxide cells and charge-protection diode DoolO8 to ap ­p ly power to the m icroprocessor while the main power isoff.

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After obtaining the bat ­tery pac k. a set of leadsmu st be attached. Do not t ryto solde r the leads d irectly tothe battery. Unfo rtuna tely,th is battery is no t equippedwith solder tabs, but with alittl e effort and thought , arel ia ble connec tion can bemade. One way of a ttachingleads is to solder a sma ll

al low cha rging c urre nt toflow into the batt ery whenthe powe r SWitch is on.

The battery pack shouldbe a three- or four-cell pack,readily avai lable, and smal lenough to fit into the co n­fines of the Azden controlhead . The ava ilable space islarge enough to hold a cylin­d rical battery approximate­ly 3/4 of an inch in diameterand up to 2-1/8 inches long. Ichose a common pager bat­tery made of three cells(nominally rated at 3.9 volts,140 mA hours). The battery isMo t orol a par t n umb er~)083009H02 and can beo bta ined at any authorizedMo torol a Se rvice Cen ter(they are nume rous); theyshou ld al so be availablefro m a ny service shop thatrepairs pocket page rs Sincea very la rge number of thesebatteries is manufacturedeac h year, the pr ice is quitereasona ble; they se ll for lessthan ten dollars eac h. This isjust slight lv more than theprice of one set of con­sumable silve r-oxide cells

Addi ng a NicadBattery pack

The first change we canma ke is to repl ace those ex­pensive litt le silve r-oxidece lls with a nicke l-cad miumbatte ry pack wh ich is re ­c ha rged every lime thetr a nscei ve r is used Theo rigina l c ircu it (F ig. 1) has di ­ode protection (0 408) for adepleted or shorted cell . butthis same diode a lso blocksany cha rging current to thememory battery (we wo uld n'twa nt to try to cha rge thesilve r-oxide cell s). As shownin Fig. 2, the simple add itionof a resistor ac ross 0408 will

Se pa ra te the control headfrom the main chassis. Re­move the top a nd bottomplates; the re is a sing le sc rewon eac h side of each pan el.(Page 17 of the Azden in­struc tio n manual shows thispro cedure.I Now rem ovethe fou r screws on the backplate; a lso remove the si ng lech rome-plated sc rew In theright rear corne r of the con­trol board . This will all owthe rear plate to dangle onthe speake r-jack leads , Thisjac k must be removed toa llow room for the addit ionof the battery pack asdescribed in a later para­graph . Unscrew the speakerjack from the rear plate; se t 'the three cove r pla tes a nda ll the sc rews aside.

se lf; no changes a re made tothe main radio chass is.

Disassembling theCon h oI Head

All the changes descr ibedin th is a rticle a re madewithin the control head it-

woul dn 't it be ni ce if thereceiver would pause for afew second s afte r therepeater dropped off. toallow for that slow-to­respo nd fel low? This art icledea ls with al l these prob­lems and more, with someeasy and re lia b le mod ifica­tions.

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A re you tired of replac­ing t he silve r-ox ide

memory backup cell s inyour Az den ! Have youdiscovered the hard waythat the IIC5-2ooo drawsnearly 20 m ill iamps fro myou r auto m o bil e batterywhen the power switc h isof f! Do you so met imes findyourself wishing there wasan easy wav to quick ly sam­p le the repea ter in put fre­que ncy w hen receiving?How about so me hang timewhen in the scan mode;

fig . 2. Modified memory-protect ion circuit uses a three­cell nicad pack instead o f the silver-oxide cells. Add ing a-I70-0hm resislor across 0-108 allows the nicad pac/.. tocharge whenever the rad io is operated.

2G 73 for Radio Amateurs • February, 1986

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o f t hi rty percent. Thus ,140,OCMJ x1 .3 =1 82 ,OCMJ e f­fective pAh. Div iding thisby 75 microa mps and 24hours, we ca n predict th atth is battery should kee p thememory happy for morethan three months.

The charge rate of 3.bmi lliamps was c hose n to bewhat is known as a min­imu m ra te. This rat e ofcha rge is sa fe fo r co n­tin uous cha rging w ithou tharming t he battery. If youwish to modify the cha rgerat e , all that is necessa ry isto change the added resistorto a new va lue found by sub­tracting the battery floa tvoltage from 5.9 volts andd ividing the answer by thedes ired c urrent. The 5.9volts is the regu lated Vddfound on the cont ro l boa rdwhich we use to charge thebattery . Be ca reful not toload this too heavily. A litt leex pe ri ment ing wi ll showquickl y what is too much

Fig 3. M o ving R-l H to the cold side o f the power w .itchelim inates current dra in from th e vehicle benerv whenpowered o ff.

Fig. 4. Num bering sequence for con trot-boerd card-edgeconnec tor. Odd numbers are on top; even num bers are onthe so lder side.

Reducing the StandbyCurrent Drain

switc h was off. The industry­a c c e p t e d stan da rd fo rmobile rad io s d icta tes aprimary power connec tiond irectly to the vehicl e bat­tery . Under worst-case co n­d itions - ve ry cold wea ther,for example - it is possiblet hat a ft er an extendedperiod o f non-use th is con­stant discharge could pre'vent a vehicle from sta rt ing,To eliminate this possibility,rewire the cont rol processo rboa rd power as shown inFig, 3.

This change is made ve rysimply by moving one e ndof resistor R414 from mainca rd-edge connector pin 26to pin 25. Fig. 4 shows theproper numbering seque nceof this connector. Trace pin26 a long the foil un t il youfind R414. Lift th is e nd ofR414 from the board andtack it back down on asolder pad - about a quarterinch away -which comesfrom connector pin 25.

The result of this cha ngeis that sta nd by current d ra inwhen the mai n power switch

My Azden PCS -2000 is off d rops to a n insignif i-came from the factory wired ca nt few tens o f na noa m-in suc h a way tha t it con- peres. ThIS c urre nt comessumed 20 milliamperes from fro m the reverse leakage inthe primary power source the power transistors in theeve n when the mai n power rf PA modu le .

73 for Radio Amateurs " February, 1986 21

Battery Capacity and Life

The 470-ohm resistor incombination with the nom­ina l a-volt battery ca usesa bou t 3.6 mill iamps ofcha rge c urrent wheneverthe power switc h is tu rnedo n . The m emory-backupdrai n with the power switchoff measu red about 75m icroamps on my radio. Ifwe a ssum e a n ave ragetyp ical operat ing time o fone hour pe r day (to a ndfrom work, for example),the n the battery Will becharged for one hour anddischarged for 23 hours outof each day,

A typica l nicad ba ttery ison ly about sixty percent ef­fi cie nt when charging, so thetota l charge per day will be3 bOO x 0,6 X 1 = 21 60, orabout 2 mil liamp/hours perd ay. The battery will d is­charge for 23 ho urs at about75 microarnps. thus t hed ischarge will be 75 X 23= 1725 or about 1,8 mil­liam p/hours per day. Thusou r ba ttery sho u ld sta ycharged if the rad io is usedan average of 45 m inutes forevery 24 hours that it is off.These are worst-case figures,and in reality the batteryprobably needs only about30 minutes of cha rge perd ay. Also note tha t as thebatterv becomes disc ha rged,the cha rge rat e will increaseslightly due to the increasedbat te ry terminal volt age .

With a discha rge ra te of75 microarnps a nd a batteryrating of 140 mAh, we ca npredict how long the batterypack will protec t the mem­ory without ever being re­charged (if, for exam ple , theradio goes unu sed for seve r­al da ys). Most cylindrica lmead packs exhibit an in­crease in the ir Ampere/hou rcapac ity whe n discharged ata very low rat e (we q ua lify)This increase is in the o rde r

dered to the back side of theboard, but th is area is bestreserved for some of thefollow ing mod ifi c atio ns .The battery fits vertical ly inthe space directly behindthe scan-mode switc h,

solder lug to the e nd of eac ho f the two leads a nd thentape th e lu gs in p la ceaga inst the ends of the bat­tery, forming a homemadebattery holder. (l placedsmall pieces of foam rubberon top of the Iugs andundernea th the ta pe as asort of spring to e nsure agood, firm connec tion at alltimes .) The lugs should beplated rather than ba re cop­per. This will e nsure trou ble ­free contacts in the fu ture.Wrap the whole assembly inta pe or kraft paper to gua rdagainst sho rt c irc uits ; re ­member t his pack mustsqueeze into a sma ll spacein close proximity to the fo ilside of a pr inted circuitboa rd ,

We must next modify thec ircuit of Fig. 1 to a ll ow thebatt ery to be cha rged. Lo­cate 0 408; it is on the maincontrol boa rd just to the lef tof the old battery holder.Solder a 470-Dhm, 114 -wa ttresistor across th is diode .This should be done on thecom pone nt si de of t heboard if you pla n to imple­ment the o ther modif ica­tions in this art icle . If theleads a re pre-t inned, it isqu ite easy to tack the resis­tor right onto the leads ofthe diode ,

Finall y, the battery packmust be soldered in to theci rcu it. (If you pla n to makemore modif ica tions, it willbe easier if the battery is no tyet attached to the controlhead.I Befo re the battery isinstall ed in the head, it is agood idea to cha rge it; mostnicad batteries a re at leastpartia lly discharged whenpurcha sed due to t he irre lative ly short she lf life .Cha rge the battery by a pply­ing 12 to 14 vol ts th rough a1000-Dhm, V. -Wa tt resistorfor at least ten hours. Nowpre-tin the leads a nd the twoc lips on the o ld batteryholde r, Try to attac h thewires slightly down the sidesof the clips because the re isve ry little clea rance be­tween the cl ips and the toppla te whe n it is restored . Thebattery leads ca n be so l-

Fig. 6. Reversing switch is mounted in the microphonecase. Lift one end o f R~05 and add 0 4 ' 1 as shown.

Sca n Hang Ti me andSca n Samp le Mode

The idea of scan hangtime-the pausing of thescan for a few secondsbefore continuing after achannel becomes c lea r-c- Iscertainly not new. But it isindeed a most w elcomedasset; without it, any pausein the center on it scannedchannel wil l resu lt in thelossof that channel until thescan comes around againWhile driving through a mar­ginal area, everv t ime thereceiver squelc hes due toflutte r or " p icket-fenc ing,"the scan Will resume and thechannel will be momentari ­ly lost. The add it io n o f a fewseconds o f hang time Willcorrect this aggravat ing sit ­uat ion.

Another mode of scan­ning is the sam ple mode. Inthis mode, scann ing pro­ceeds normally until an ac­tive channel is found; how­ever, instead of stay inglocked to that channel unt il

( 0 411) and R40 5 Thi Sground is reflected throughR405 and O4OY to the baseof Q403 causing i t to con­duct. ty ing processo r l inesR3 and Kl together This isthe signal to the processorto change to the offsetfrequency , At the sam eurne. the ground from them ic rophone is blocked byD411 from getting to thetransmitter board Thus theradio remains in the receivemode, but on the transmit(o ffset) frequencv.

Note that this is a receiver­reversing. not a t ransm itter­reversing sw itch; if the PTTsw itch is pressed while in thereverse mode, the trans­mitter will come up atwhichever frequen cy isstored as the offset. Saying itanot her w ay, the transmitf req uency is not affected byeither position of this newsw it ch. Al so note that the re­versing sw it ch relies uponthe sto red o ffset to function;if the rad io is in the simp lexmode, throwing the reverseswi tch wi ll do absolutelynoth ing.

wires and one slate (gray)wire attached to the squelchpot. The reds are common(grou nd) and w ill be at­t ac hed to one side ofthe new slide switch; theslate wire goes to the otherside of the switch. Thephysica l mounting of theswitch is made sim p le by theuse of qu ick-sett ing epoxyglue, Larger switches makenecessary the removal ofthe mounting posts thatheld the sq u e lc h pot.Choose a SWitch whose sl idearm doesn't stick throughthe case too far and w hoseac tion is stiff enough topreclude accidenta l opera­tion when handling themicrophone. Rea ssemblethe microphone , beingcareful not to pinch any o ft he ti ny wi res,

At the con t ro l head .locate R405 (al l the part s onthis board are well labeledwith white s il ksc re e ni ngj.Find the end that connectsto the cathode of 0409. Un­so lder the o ther end o f R405and hft it off the board In­sert the cathode e nd of anew diode, a 1N914, into theboard where R405 wa s.Tw ist together the anodeend of the new diode andthe f ree end of R40S, Con­nect to this junction a fou r­inch piece of insulated wire.Turn the control head ontoits face and find the boardholding all the potent iome­ters and switches.

Loca te a large elect ro­lyt ic and a 22-0hm resistor.On the solder side of theboard , about Yo of an inchbelow the 22-Dhm resistor(towards the LEOs), thereshou ld be a p ink w ire co m­ing f ro m pin b of the m icro­phone socket. lift the boardend of this wire and connectit to the four-inch length ofwire coming from the nevv·d iode. Insulate the sp l ice.See Fig. 7 for pin numbers ofthe microphone socket.

Refe r to Fig 6 for thefol lowi ng explanation.when the reverse sw i tch isthrown, a ground is placedthrough the sw it ch to thejunction of the new diode

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With the addition of a sin ­gle diode (shown in Fig. 6)and a slide switc h in the mi­crophone case, we have aninstant reversing sw itc h. Imounted my switch in thespace vacated by the re­mote squelc h cont ro l. Theloss of this external sq uelchpot was not a prob lem sinceit was never used anvwev .

play to show the offset fre­quency. By telli ng the pro­cessor that we wish to trans­m it but at the same t imewitholding this informationfrom the t ransm itter, theradio will receive on thetransmit frequency !

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Add a Reverse-Input Switch

Because of the way themicroprocessor funct ions. itis very simple to fool thereceiver into l isten ing on therepeater's input instead o fthe output. Refer to Fig. 5.One of the things that hap- Separate the microphonepen s when the microphone c ase by removing the fourPTT SWitch is pressed is that sc rews in the back piece. Re­the microprocessor repro- move the squelch knob andgrams the vco for transmit- po t ent iom et er f ro m thetmg on the o ffset f requency. m icro pho ne case. (For thoseThis PH signa l also goes to of you who have purchasedthe transmitter board to en- the old-style Azden OTMFable the transmitter and dis- tone microphone option,able the receiver. The pro- the knob will be missingcesser also changes the d is- alreadv.) There are two red

22 73 for Radio Amateurs • February, 1986

Fig. 5. Engaging the PH switch causes the microprocessorto change the \lCO to the transmit freq uenc y and causesthe transmit switching to mute the receiver and fum onthe transmitter. Adding diode D-l) 1 and the reversingswitch allows the processor to be switched to the transmitfrequency while staying in the receive mode.

73 for Rad io Amateurs · February, 1986 23

Fig. 8. Scan -con tro l circuits before modification . Squelchactivity enters board at pin 14 and arrives at scan-controlswitch Q~()4 either inverted or normal or not at all, de­pending upon the positio n of the scan switc h. Scann ing isstopped while Q404 is turned on; it resume.s when turn edoff.

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We Give You VHFWithout VHC:(* - Very High Cost)

0412 and 0 413 ma ke up anO R gate feeding the SQ' linethrough the scan switch.When a chan nel becomesbusy. the SQ SIC line goeshigh and is inve rted to a lowby Q401 . This low is fedthrough 0 412 to the SQ' linestopping the scan. As long asthe channe l is active, thescan will be stopped .

Now look a t IC403-A and

cuits and goes high fposinve)when a channel becomesact ive . Typical values are7.5 volts high, 0.1 volts low.

Referring to Fig. 8. we wi llfirst examine the unmodi­fied c ircu it. In the V or va­ca nt mode, the rece ive rscans until it finds a vacantcha nne l A vacant channelwill pull the SQ SIC low; thiswill be inver ted to a high byQ401 and back to a low byQ402. This low will exit thecontrol board via point 73,pass th rough the scan switc hto the SQ' line, and stop thescan. In the B or bu sy mode,the receiver scans until itfinds a busy chan ne l A busychanne l will cause the SQSIC tine to go high . This is in­ve rted to a low by Q401 andexits the boa rd on po in t 74 ,passes through the sc a nswitc h to the SQ' line, andstops the sca n. In e ither ofthese modes, as soon as thecha nne l activity changes(for example, from active tosquelched), the SQ SIC linetoggles and the scan imme­diately resumes. In the F orfree-scan mode, the scanswitc h simply opens the SQ'line and the rece iver scansfreely without ever sto p­ping. regard less of channelact ivity.

It can now be seen that a llthat IS needed to add somehang time to the B o r busymode is simply to add so medelay to the SQ' line afte rthe channe l has squelched.If we add this de lay in theform of an O R gate to theexisting c ircuit, then thescan will be stopped by anac tive cha nne l and he ld bythe tail-end delay. The sam­ple mode is much the sameexcept that we remove theSQ SIC sq uelc h inpu t to t heO R gate so that the o nlything that stops the sca n is atimer pulse trigge red by thechanne l ac tivity; when thetimer runs ou t, the scanresumes.

Fig. 9 shows the addedpa rts and how they interfacewith the existing circuitryThe V or vacant mode worksthe same as It a lways has. Inthe B o r busy mode, diodes

it is clea red. the samplemode auto matica ll y forcesa resume-scan trigger signa levery f ew seconds. This a l­lows a sampling of al l activechannels so that no onechannel can lock out anyot her.

Under crowded band con­ditions th is mode can be­come very co nfusing, butunde r the right co ndit ions itcan be very usefu l. giving asort of priority channel fun c­tion. ensu ring that a ce rta inchannel will always be li s­tened to at least once everyfew seconds. It seems thatmost hams have a f avoritetwo or three repea ters theygenerally listen to, and if a"pnontv" repeater is pro­grammed into every othermemory location, then thelistening dut y cycle for thatmachine is ve ry high andguaranteed by using thesample scan mode .

These last two additionsare grouped together be­cause the c ircuitry neededto Implement them is cen­tered a ro und a single inte­grated circu it. Fig. 8 showsthe circuit ry involved withsc a nning The impo rta ntparts here are R406 andQ404. It is important toknow that a ny t ime the SQ'line (control-board point 75)is pulled low, Q404 will con­duct and scann ing wil l stop.To resume scanning. all thatis necessary is that theSQ ' line be re le ased tofloa t high .

To begin a sca n, some­th ing e lse happens. but on cea scan is in progress. pulli ngline SQ' low wi ll stop thescan and le tt ing it go highwill immediately sta rt thescan aga in. This will con­t inue until the sc a n ispermanently sto pped bypressing one of the sto p keysor by keying the PTT button.

Another important bit ofinformat ion we need toknow is what happens to theli ne SQ SIC (cont rol-boa rdPC edge-connector pin 14)when a channel becomesactive and inact ive . Thissigna l co mes from the re­cciver board squelch C1r­

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f ig. 10. Consuucutvg the new scan-contro l c ircu its on aboard this size and shape will allow them to ii t neatly in ­side the contro l head between the control board and thepotent iometer mounting board. The boa rd ;s shown hereas it would be vie wed loo king from the front of theA 7den, down thro ugh the exis ting co nt ro l board.

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Fig. 9. Seen-contro l c ircuits etter modification. N umbersin squares refer to exis ting control-board pin or padnumbers. Num bers in circles refer fa inputs and o utputson the new board. 1(40J A and B and 1C40]C and 0 arewired as m onostab fe mulr;vibrators triggered b y D·fl 4 and0 41 5, respect ively. Squelch aeliy ilv enters th rough p in14, upper le ft. Scanning is stopped whi le Q404 is turnedon; it resumes when turned o f f, lower left.

low is a pplied through D414 the sca n begi ns aga in e ve nto the trigger-pul se genera- though the cha nne l is stilltor made up of ( 410, R41 b, busy. The reason for th is isa nd R41 7. This trigger pul se that the trigge r-pulse genet ­is applied to pin 2 of the ator, ( 412, has not reset a ndpu lse generator, beg inning a the refo re ca nnot re trigger2.5-second low pulse that the hold ing pulse unt il thekeeps the sca n stoppe d receiver restarts its sca n.th rough 0413, If the channel W ith the part s va luesis sti ll va ca nt when th is shown, the ha ng time ispulse ge nerato r t imes o ut, a bout 2.5 seconds and thethe sca n will begin aga in. sam ple time is about 5 sec-

Whe n the F or sa m ple e nds. These times can be a l­mode is chosen, an ac tive t ered by c ha ng ing R41 8c ha nne l again pull s the col - (ha ng t ime) o r R421 (sam plele ctor of Q401 low; thi s low time). Be sure to use tan­is fed through diode 0415 to talurn ca pac itors for ( 411the trigger-pulse ge ne rator and C41.>; o the r types maycomposed of C412, R41 9. be too leak y to al lo wand R420. This t riggers a re liable operation. Do no t5-second low-going pu lse subst itu te TTl NAND gates;which is fed th rough to the the input impeda nce is sub­SQ ' line a nd stops the scan, stantia JJy dit ferent and theWhen this pulse t imes o ut, t iming will be com pletely

24 73 for Radio Amateurs • February, 1986

wro ng. O ther CMOS NANDgates such as the (0401 1may be substituted , bu t beca re fu l: The pino ut will no tne cessarily be the sa me. Thedecoupling capacuo rs. ( 414and (415, may not be neces­sa ry; they refle ct my puris tattitude in good circuitdesign.

The sa m ple mod e ofscanning is imple mented byusing the o ld "free-sca n" po­sit ion of the scan switch.The output of the sam ple­mode pu lse ge ner a to r(1( 403 pin 8) is fed to the un ­used switc h terminal la­beled F, as shown in Fig, 9.

Component layou t is notpar ticula rl y important forth is c ircuit; the only real c ri­ter ion is tha t the finished c ir­cuit fit within the confinesof the control head . 1 usedprinted circui t techniqueson an L-shaped boa rd asshown in Fig. 10. This simplec ircu it ca n very easilv bemade by hand-pa int ing theboard using a sma ll brush o rresist pen. v ectorboard wir­ing is al so a viab le a lte r­nat ive . Even wire -w ra p tech-

niques could be used if thepins were lim ited to level ­tw o he ight. Afte r the circuithas been co nstructed, inter­connect It to the cont ro lhead as follows (see Fig 10):

1 ) Co n nec t a Svi n c htwisted pa ir o f wires to thenew boa rd at + Vdd andgrou nd .

2) Co n nec t a J -inc htwisted triplet o f wires to thenew boa rd a t SQ ', A, and B.

3) Connect a -t-mch wireto the new board at XF .

4) locate (403, a 470·jJFele ctrolyt ic mou nted on thefoi l side of the control boardunder the processo r ch ip,

5) Solder leads + Vdd andground across the leads of(403; observe po lar ity.

6) Locate the three-wireribbon ca ble that comesfrom control-board poin tsSQ', A, a nd B. Unsolde r thiscab le from th e co nt ro lboard a nd re solder it to thenew board as follows: whatwas so lde red to SQ', A. andB on the contro l boa rd nowconn ect s to XSQ', XB, andXV on the new board, in thatorder.

Fig. 12. PC board.

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Fig. LJ. Component layout.

rmc roam pere .

aga in. The receiver shouldstop on the f irst busy chan­nel and stay there unti l Itclea rs. It should then rem ainthere an add itional 2.5 sec­onds (approximately) beforesca n ning resum es. Nowswitch the scan mode to F.Thi s is the sam ple-sca n posi­t ion, The receiver shouldscan for a busy channel asbe fore; however, aft er itlands on an ac tive channel,it w ill stay there for o nlyabou t 5 seconds and then re­sume scan automatically.

Now place an offset intothe m emory - either p lus o rm inus w ill do , Watch thed isp lay and th row the re­verse sw itch on the micro­phone. The d ispl ay sho uldchange to the offset and thereceiver wi ll follow thedisplay .

If a sensi t ive curren t me­ter is available, the standbycurrent drain can be mea­su red; it should be less thanone microampere With thepower sw itch off and thepower cabl e connec ted to asource of 12 vo lts. Typically,it w ill read less than 0,1

severa l pro blems. The onlyrel iable w ay of f inding outwh ich is to trace the Wi ringstep by step and isolateeach possible load unt il thebad one is found. Begin byverifying thai every circu itexcep t the rf PA board isconnec ted to the cold sideof the power sw itch. Next ,d isconnect the power fromthe rf PA board (pull plug1'.1(1). The PA is loca ted onthe bottom side of the mainchass is at the rear and isco nnected to the hot side ofthe power sw itch.

If the reverse swi tchdoesn't work, check that itreal ly is switching a groundall the way back to the con­t ro l board; check that thepolarity and locat ion of0 411 are correct.

A problem with the scan­ning m od ific ation must beei ther in the new board or inthe connecnons to it (assum­ing the scanning wo rkedproperly prior to the modifi­ca tion). The pulse gener­ators can be checked With aYOM by watching their out­puts and pull ing the triggerinputs low; w ith a groundedclip lead. touch the anode

Troubleshooting side of the trigger diodes.No memory backup could Check the pola rity of 0412

be due to a disch arged and 0413. Check the w iringm emory batterv. a ful ly- between the boards andcharged battery will read scan sw itch. M ake sure theabo ut four vo l ts w ith a correct F point o n the scantyp ical YOM . Anyth ing over swi tch was used (there areth ree volts should still hold two points labeled F on thethe m em ory. Recheck the scan-sw itc h PC board; Fig 11battery polantv. the control shows the correct one).board has a plus and mmus T he se mo d if ication ssilksc reened near the o ld shou ld give you even moreholder. en iovrnent f rom an aln-adv

Too m uch standby cur- superb piece of communica­rent drain cou ld be d ue to lions eq uipment .

73 for Radio Amateurs • Fe bruary,l986 25

flu sh-type d iagona l cu tters,a sharp knife, or similar too l.

Cau rion- be very ca refu lnot to drop clipp ings, fil ings,o r bits of solder into the con­trol head; hold the unit up­side down when smoothi ngup these connections!

Now slide the battpry intothe space provided and re­assemble the contro l head.The top pl ate wi th the bit o ffoa m rubber o n the insidemounts so that the foam ispressing on the old batteryholder. A p iece o f elect ricaltape over the battery leadso n the o ld hold er wi llel im in ate any pos stbilitv ofa short to the cover.

Testing Your Work

Plug t he control head andthe rnam chass is back to­ge ther and hook up powerand an antenna. Tu rn on themain power sw itch and writeseveral o f your local repeat­ers into the memory. If youdon't have that m any re­peaters, write in anything;right now we just w ant tom ake sure the memory back­up is work ing. Now tu rn offthe power ami go have a cupo f coffee.

A fter f ive o r ten m inutes.tu rn on the power aga inCheck t he m em o r y; allshou ld be as it was be forethe power was killed . Nowmove the scan switch to therigh t-hand V position, Pressthe MSCAN button o n thef ront panel . The receivershould stop at the f irst va­cant channel encounteredand stay there unt il thechannel becomes ac t ive .No w ad va nce the sca nsw itch to the R position. Ifthe receiver is not scanning,press the M SCAN button

7) Solder the triplet ofw ires to cont ro l boardpoints SQ', A, and B fromthe ident ica l ly-designatedpoints on the new board.

8) Solder the w ire comingfrom point XF on the newboard to the unused pomt Fon the scan-mode sw itch'sprinted ci rc u it board, asshow n in Fig, 11 .

A ft er all co nnectionshave been made, wrap theboard completely with el ec­trica l tape o r heavy kraftpaper to eliminate any pos­sib i l ity of short c ircuit s, Nowgent ly guide the board intothe space between the ex­isting control board and thepotentiometer m oun t ingboard, keeping it well to thelett side, d irec t ly under­neath the old silver-oxidebatte ry holder , Fold the con­nccting wires neatly intopl ace beside and under­neath the new board . Thestiffness of the connec t ingwi res and the ribbon cableserve to hold it in place ade­quatel y; no spec ial mount­ing is reall y necessary.

Now solder the mead bat ­tcrv 10 place as discu ssedpreviously, mak ing su re thatit is wrapped suf f icient ly sothat it will no t becomepierced when crammed intothe confi nes of the controlhead. The battery fi t s ver­t ically in the space direc t lybe hind the sca n-m o d ero ta ry swi tc h. Remem ber,the externa l speaker jackwas removed to make roomfor this.

Before sliding the batteryIII p lace, try to smooth upthe rear solder connect ionson the PC board for the scanswitc h by snipp ing the sharplug ends flu sh, using sem i-

•

lohn T Cod-JOg \\6L0 818811 ","spes; Dr;veSaratoga CA 95070

VIC RAMification: Part IIIThank W6LOB for the memories.

FRONT

Fig. 1. Inside the v IC-la. Piggyback your new memory onfy where sho wn.

26 73 for Radio Amateurs · February, 1986

4) Locate data-buscontrol­ler UD9. Th is chi p is locatedfourth from the left in the rowbelow the expansion connec­tor.Tab le 1 shows the connec­tion s o f the chip -sel ectsignals. It would be wi se toverify the specif icat ions pre­sented here with a VOM

5) Cut traces. Th is step istaken to stop the VIC f romshu tt i ng off t he data-bust r a ns ceive r w hen RAM1 ,RAM2 , or RAM3 a re ac ­cessed. To cut the traces youmust f irst remove the V ICboard from the case bottom .It is attached to a metal car­rier by three small machi nescrews and by solder tabs, Re­move the metal carrie r fromthe case bottom, and then re­move the carrier f rom the V ICboard by heating the solderta bsand prying them up.

Remove the three smallm a chine screw s, and t heboard is free. The traces tocu t are at pins 2, 3, and 11 atUD9, at pins12, 13, and 14 ofUC4, and at p ins 14, 15, and16 at the expansion connec­tor. A lso cut the tra ces be­tween pin 1 and pin 2 andbetween pin 2 and pin 7 ofun (74 LSOB)

Use the x-actcs knife forthi s task . Here are two warn­ings! Fi rst: When you turnedt he boa rd over, t he rela­t ive position of t he pin schanged . What wa s once onthe left is now on the right.Be ext ra carefu l that you arec u tti ng the correc t tr aces.Second : M ake two cu ts veryclose together and pry outthe ti ny c hu nk o f copper,and don't let it get under anyo f the chi ps. W et the end o f

the previous article if yo urV IC uses 2114s.) The 6116sare directly in front o f the6522s and are desi gnatedU15 and U14. They are 24­pin chips, and rega rd less ofthe number on the top ofthem, they are equivalent toHM611 6s. You may ignorethe three 2114s which are di­rect ly t o the ri ght of the6116s.

3) l ocate the ch ip-selec tgate, the 74LS138, wh ich issecond f rom the left in therow of ch ips di rect ly be lowthe expansion co nnector. Itsdesignat ion is UC4. It is usedas an address decoder pro­v id i ng c hi p -se lec t si gna l s(l ow) for eac h 10 24-by t epiece in the fi rst B192-byteblock, w hi ch we could ca llBlKO. W e are interested inthe select lines for RAM1 ,RA M2, and RAM3. Thesesignals travel to the expan­sio n co nnecto r and also tothe data-bus contro l ch ip,the 74l S133, des ignated asUD9

once in step 7 o f the proce­dure sect ion.

The theory o f operat ionremains the same as spec i­f ied in the earlie r art icl e. Thelist of m aterial s and tool s ischanged on ly by the subst i­tu t ion o f two HM 6116-4s fort he 2114s. The 6116s canalso be obta ined f rom l D RM ic rodevices, 1224 S. Bas­com Avenue, San Jose CA9512B, for $4.75 each. Themajor change is to the pro­cedure sect io n. The newerV IC-20 has a much differentparts layout and a m uch nar­rower board , Despite thi s, itsbasic functions remain un­changed ,

Procedure

1) Open up the V IC. Thereare three Phil lips screws un­d er t he fron t edge o f theV IC. Rem o v e t hese a ndgently lift the f ront. The caseis hinged at the back . Un­plug the keyboard cable andt he power-indicator l am pcord .

2) locate the 6116s. (See

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I n m y p rev iou s article," V IC RAM if icat ion: Part

11." which appeared in theJanuary, 1985, issue o f 73Magazine, I mentioned analternate procedure for VIC­20 s u sing 2 K-b y-B RAMchips. l ater ve rsions o f theV IC-20 have a grea tly re­d uced c h i p cou nt. W herethere had been eleven 21141K-by-4 RAM c h ips, t herenow are on ly three. Two ofthe remaining 2114 s areused for the low est 1K blocko f RAM ( i nc l udi ng p ageze ro ) and t he t h ird i s fo rco lo r memory . The eightmissing 2114s have been re­pl aced by two 2K-by-8 chips.I used HM6116s in this sec­ond pro cedure . I believethat TMM2016s will do aswel l.

I wou ld al so like to apolo­gize for an error I com m ittedin the f irst art icl e. W hereverI made reference to pins 4, 5,a nd £> o f t he 74 lS1 33, i tshou ld have been to p ins 5,6, and 7. Thi s error occurs inTable 1, twi ce in step 5, and

(UC4) (U09) Expansion74LS1 38 74lS1 33 Connector

AAM 1 pin 14 pin 11 pin 14AAM2 pin 13 pin 3 pin 15AAM3 pin 12 pin 2 pin 16

Table 1.

Program listings.

Fo r fin al assem b ly, fa stenthe case to p to the bottomw ith the three lo ng screws.

Testing

Please refer to my January,1985, article in 73 for the sec­tions on test ing and movingt he screen, Basically, whenyou power u p you r V IC-20afte r th is mod if icat ion , yousho uld recei ve t he message" 6655 BYTES FREE .'" had ne­glected to cut the trace con­necting pin 14 of UC4 to pin11 of UD9, thereby deprivingmysel f of1024 bytesof addedmemo ry. A couple of swi peswith the trusty X-acto and allwaswell. _

SCRMOV program listing

10 POKE 36869,14412 POKE 648,414 FOR J .. 217 TO 228:POKE J,132:NEXT16 FOR J '" 229 TO 250:POKE J,l33:NEXT18 POKE43,O:POKE44,6:POKEl535,O20 Cl R:NEW

Alternate load address procedure (direct mode):POKE43,1:POKE44,16:POKE4096,O:CLR

AAMTEST program listing

10 PRINT"RAM TEST"12 A ", 1024:B =409514 FORI ", ATOB16 PV .. 85:G08UB2418 PV '" 170:GOSUB2420 NEXT22 PRtNT"TE8T COMPl ETE" :END24 POKEI,PV26 IF PEEK{I) .. PV THEN RETURN28 PRINT"ERROR AT ADDR." ;I30 PRINT" DATA IS" ;PEEK(I)32 PRINT" SHOUlD BE" ;PV34 RETURN

wire ly i n g a ro u nd o n th eboard?• Second, are there any so l­der bridges between pins o nt he pi gg yba c k ed RAMchips?

T h e t hi rd p o i nt m a ysound sill y. It isn't. In themodification descr ibed inm y p rev ious a r t i cle , I i n ­sta l l ed o ne o f m y 21 14sbackw ard . I found o ut dur­ing testing.• Be sure your6116s are allpointing north, as it were.

Af te r you r wo rk passesth is vi sual inspecti on, rei n­sta ll the board in the casebottom.

9 ) Button up th e VIC .Sc rew t h e b o a rd to t h eshield carrier and bend the Referencest abs over. A fte r testi ng isco m plete, resolder the tabs Nick Hampshire, VIC Revealed,to the board . Attach the ca r- Hayden Book Company, 1982.

A. Finkel, N. Harris, P. Higgin·ner shield with the circu i t bottom, and M. Tomczyk, VIC-board to the case bottom . 20 Prog rammer 's Referenc eDo not get the screws for Guide, Commodore Businessmounting the board m ixed Machines, rnc., and Howard W.up with those for fastening Sams & co., inc., 1982.the case bottom to the case John Hellborn and Ran Talbott,t op (keyboard). VIC·20 User Guide, Osborn el

H i nge i n th e c ase top ; McGraw-HiII,1983.connect the keyboard plug Jim Butterfi el d, " Al ternate

Sc reens," Compu te!s Firs ton the lef t and the power-on Book of VIC, Compute! Books,light p lug o n the right. For 981 2.ini t ial testing. you m ay w ant John T. Cocking, "VIC RAMifi·to leave the case to p f ree or calion: Part II ," 73, January ,even ott to the side a little. 1985, pp.22-24.

73 for Radio Amateurs . February, 1986 27

new ch ip to pin 1 of an on­board chip without a piggy­back pa rtner . Do this fo reach pi n with the exceptionof pins 18 and 20.

Note any pins showing anopen ci rcu it . Use the tip ofthe x-acto kn ife to gent lypush and ho ld the pin whileapplying the soldering iron.Retest the cont inu ity withyourVOM.

7) Prepare the chip-selectl i nes which w il l connec teach 6116 to the chip-selecto u tputs. Connect pi ns 18and 20 of one6116 to pin 14of UC4. These connec t ionsare m ade on the top of theboard.

Connect p ins 18 and 20 ofthe other 6116 to pin 3 o fU13 (74l S08). Pin 14 0f U D4is the RAM1 selec t signal.We are using on ly half of the6116 co nnec ted to RAM1.RAM2 and RAM3 are ORedby the 74l SOB to develop thec hi p select fo r t he other6116.

H ow ca n a n AN D ga teperform an OR logic func­tion ? There i s a theoremwh ich st a tes : A p o sit iv e­lo g ic AN D i s a neg at iv e­logic O R. Pin 3 will be hi ghwhen RAM2 and RAM 3 arehigh; that is, neither is ac­tive. Pin 3 will be low, select­ing the 6116, if either RAM2o r RAM3 is low.

Check the continu ity ofthese connec t ions with theYOM. Now make a non-con­tinuit y check to ensure thatt he RAM 1 , RAM 2 , a n dRAM3 select l ines are NOTco nnec ted to pins 11,3, and2, re specti vely , o f the74L5133

8 ) Thi s co m p letes th ehardw are m odificat io ns. Be­fo re you p ut you r V IC-20back together and plug it in,here a re so m e i tems youchould check very ca ref u lly.• First , are there any loo sec h u n k s o f so ld er o r b are

your l ittle finger and removethe scrap from the board.

Now, using a short p ieceof stripped wi re-wrap w ire,connect 74lS133 pi ns 2, 3,and 11 to 74lS133 pin 16.This will ensure that thesethree inputs will stay high,be ing t ied to plus f ive volt s.Co n ne c t p i n 1 2 o f UC 4(74lS138) to pin 1 of U13(74lS08). Connec t pin 13 o fUC4 (74lS138) to pin 1 ofU13 (74lS08) . Verify thesenew connections (and d is­connections) with the VOM.

6llnstall 6116s. This steptakes the most time. We aregoing to piggyback tw o new611 6 RAM chi ps o n top ofthe on-board 2K-by-B RAMchips. Make sure that all thepins o n the new 6116s areparalle l. Test-fi t them on theo n-boa rd RAMs. The newchips shou ld f it snugly w ith­ou t forcing

l ocate the chip select l ptn18) and the ou tpu t enable(pin 20) on each of the new6116s and bend them o ut­ward unt i l they are ninetydegrees to the other pins.Put each chip into the thi rd­hand vise and l ight ly ti n theinside of each of the pins.Place the two new 6116s pig­gyba ck on the o n-boa rdRAM chips.

l eave so m e b reathingroom between the o n-boardchip and it s piggyback part­ner. Be sure yo u have o ri­ented the new c hi ps c o r­rect ly. Pin 1 on these ch ipsgenera lly is ind icated by an o t ch o n one e n d . Pi n 1should be at the upper left­hand corner.

Tack-solder each chip topins 1, 13, 12, and 24. Theseare the pins on eac h of thecorners. After each chip hasbeen tacked o n , brieflytouch ea c h pin ' s junct ionw ith the soldering iro n for allthe rest of the pins. Checkconti nu ity of pin 1 of the

Yesterday's Circuits TodayRemember tubes? W6HOM does. He's resurrected a half dozenof his favorite c ircuits and updated them with semicond uctors.

l u OiO~ ,

The Reflex Receiver

A noteworthy example ofyesteryear's pursuit of some­thing for nothing was thereflex rad io receiver. In itso riginal and most preva lentform, a tuned rf receiver wasso configured that an rfamplifier stage-usuall y thefirst-also served as the firstaud io-frequency stage. Atf ir st thought, such a concoc­t ion appears tota lly asin ine.Common sense tells us thatsuch a set would necessarilybe plagued with all kinds offeed back problems and in­stab ili t ies . Ac tua l ly, how-

leads to another and newconcepts evolve from pre­vious methods of problemsolving.

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has been true especia lly d ur­ing times w hen the support­ing technology was not thatgreat. In electronics, as inother endeavors, the questf or bette r pe rforma nc e.higher eff ic iency. andreduced cost has evokedinteresting schemes forsqueezing more blood f romt he t u rn ip. ( Indeed, so meinnovators m ust have origi­nally had perpetual-motionprecepts on the mind. ) Itshou ld. in any event, proverew ard ing to review a few ofthese ideas and implemen­ta tions. It is just po ssib let hat w ith modern devicesand components , new lifemay be infused into an obso­lete technique. Also, as iso fte n the case, o ne t h i ng

Fig. 2. Block d iagram of equivalent receiver to the setupshown in Fig. 1. This is a conventional (unreflexed) systemutilizing four amplifying devices instead o f the three whichsufficed for the reflex receiver. More complex reflex ingarrangements can be used to eliminate additional stages.

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Fig. 1. Basic functional diagram of the reflex receiver.A/though the stages were originally configuredaround tubes.it ~hould be feasible to use sofid-state devices such as tran­sistors, FE Js. or Ies.28 73 for Radio Amateurs .. February, 1986

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Fig. 4. An experimental tube versio n o f a regenerative mod­ulator. Strong drive is needed so that the tubes are operatedin their nonlinear regions. The first tubecanbeany ofa varietyof multi-grid tubes such as converters, pentodes, etc.

Fig. 3. Block d iagram o f the regenerative modulator. Theamplifierscan be either tube or so l id-state devices . The band­pass filters can be simple parallel-resonant circuits. Thebas icfunct ion of this arrangement is that of a frequency divider.Unless the proper frequency isapplied to the input (fiN), thereis no output.

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amplifier is ve ry sim ilar to c ur t remain s inoperat iv et he f req uency m u ltipl iers w ith no input signal . Feed­commonly used in t ransmit- back notwithstanding. theters. although it usual ly is tuned circuits are not appro­biased close to class-B rath- priate for self-osci lla t io ner than c fass-C operation . Now. let ' s see w hat takesThe harmonic output of this place when an input signalstage is su ppor ted by the of the ri gh t f re q ue ncy i sbandpass f ilter or resonant applied to the regenerat iveta nk in i t s o utput ci rcuit. modulator.Finally. this ha rmonic fre- It is probably easiest toquency is fed back to the follow the operatin gm ixer stage. In order to vi su- seq uence by referring to anallz e w ha t ha p pens , i t actual c ircuit rather than tosho uld f irst be dri ven home a b lock d iagram . For th ist hat abso lutely noth ing t ran- purpose. consider the tubespires without input signal version shown in Fig. 4. lnas­f IN. Thus. despite the feed- much as o r igina l ap p lica­back loop and the apparent tions of regenerative rnodu­opportun ity for interaction l ators were implemen tedbetween the stages. the ctr- du ri ng the hey d ay of t he

73 lor Radio Amateurs . February, 1986 29

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to st retch words a bit . A bet­ter name wou ld be st imulat­ed osci llator. or subharmon­ic generator. for that is whatactua lly t ak es pl ace : Aninput si gn a l p rovokes a noutput at an integral sub­multiple o f the input fre­quen cy. Granted , thi s i scommonly accomplishedw ith cascaded f l ip-f lops. Forexamp le. a d ig i t al watc hconta ins such a frequencydivider for red u c i n g thenominally-32 -k H z crys tal­osci llator frequency to oneHertz. And, of course, simi­lar d igita l-d iv ider systemsare used in f req u e n c ycounte rs. phase- lockedloops. digital mu lti meters.and elsewhere.

The regenerat ive modula­tor is different in an inte rest­ing way. It is an " analog" c ir­cu it that operates f rom andproduces a sine wave! It iscapable of preserving eitherFM. SSB. or AM modulation.Regenerat ive modulatorsprobably originated in theca rrie r-telephone ind ust ry,and it appears that the cir­cuit was used more in En­gland than in this co untry.At o ne time, hams used itand similar ci rcuits to getc ry sta l cont ro l o n 16 0meters (when only aD-metercrysta ls were avai lable).

The basic principle of theregenerative modulator canbe understood by referringto the block diagram in Fig.3. It takes a little bra in workto see what ac tually goes on.Once the theo ry of opera­tion is menta lly d igested.you are certainly going to beheard exclaim ing. " N o wwhy d idn't I dream that up?"

The ci rcuit depends for it sbehavior on two nonlinearamp l ifiers and two band ­pass filters. The f irst nonlin­ear amplif ier is very sim ilarto a mixer stage in a super­het: It samples two input fre­quenc ies and del ivers a d if­f ere n ce frequ en c y . Th i sdifference freq uency ha p­pens to be the output fre­quenc y of the circuit and issupported by the first band­pass fil ter o r tank circuit.

The seco nd no n lin e ar

eve r. re f l ex rad io s were" hot" performers and therewas genera lly nothing to dis­t ingu ish their perfo rmancefrom more conventio nal ci r­c u i t s except tha t a t hree­tube reflex set w o u l d .indeed. exhibit fou r-tubecapabihtv. Even those ref lexci rcuits which also inc ludedregeneration operated quitestably. Let us see why. ourfirst intuit ions notw ithstand­ing. reflextng proved a feasi­ble technique.

The schem atic of a reflexset is shown in Fig. 1 and theblock diagram of the equ iv­alent receiver is shown inFig. 2. It is easy enough tosee that the rf stage also per­fo rm s as an audio driverstage, but a little explainingis in order to il lumina te howthis is poss ib le.

In order for an amplifier.be it tube. tran sistor. or IC­to process two different f re­quency bands without inter­act ion between them, tworequi rements must be met.Fi rst. amplif ication must belinear so that no " m ixing" orheterodyning occurs. This isreadil y com p lied with byascertain ing that the ampli­fier always operates in i tscl ass-A mode. Second. thefrequency bands sho uld besuff ic ient ly different so thatthe outputs of the ref fexedamplif ier can be channelizedeasily to where they are sup­posed to go. and so tha t it iseasy to get rid of frequen­cies that t ry to go into wrongplaces. Th is is accomplishedeasily i n b roadca st-bandreflex radios becau se of thegreat difference betweenbroadcast c arri er f requen­cies and audio frequencies.Resonant tank circu its elim­mate audio f requencies. andsimple bypassing to groundeliminates st rayi ng radio fre­quencres.

The Regenera t iveModulator

The regenerative modula­tor is a novel and unique ci r­cuit. 115 mystique isenhancedby its very name -it is not amodulatorwith positive feed­back unlessyou are prepared

-by applying the appropriatesignal to the control el ementof an amplifying devicesuch as a tube or transistor,you can make it conduct forthe better part of just onepola r ity of an applied acwave. In other words, youhave accomplished rectifi­cat io n. It so happens thatthe enabl ing signal must beapplied to the control ele­ment in synchro nism withthe wave you wish to rect ify;t heref rom stem s the term" synchronous rectifier," Thequestion before the house iswh y do it thi s way when wehave no end ot speciali zeddiodes specifically designedfor use as rectifiers?

The quick answer is thatthe sync hronous rect if ier iscapable of developing appre­ciably less forward voltagedrop than conventio nal si l i­co n diodes when they werethe last word in rectificationefficiency. But the bottomline is that the synchronousrectif ier can, in some cases,compete favorably with themodern Schottky diode inthe matter of forward volt­age drop, And. at least forlow-frequency work , thesynchro nous rectifier tend sto be more economical tou se in p roduction eq uip­ment.

In order to grasp the sig­nificance of the " resurrec t­ed" synchronous rectifier, itshould be understood that.with bipolar transistors, itsapplicat ion is limited to low­voltage (say five volts). high­current power supplies. Andit is f requency-limited tosomething in the mid-audiorange, at best. No pretense ismade that is usable for 20­kH z square waves. But for60 Hz , its rectifying efficien­cy can be superb. It is feasi­ble to rectify 25 or 50Amperes and incur a fo r­ward voltage drop on theo rder of Yo vol t, or less

Before we go any further,it must be expla ined that thesynchro nous recnfvmg ele­ment we have been talkingabout is none other than thegermanium power transis­tor . I f you thought this

,

The SynchronousRectifier

Al though t he notion ofsynchro nous recti fication isas old as the hills, don't betoo surprised to find it simplementation in some ofthe most sophisticated mod­ern power supplies. Its basicconcept is simple enough-

The transistor version IS

sh o w n in Fig . 5 . In thi sinstance, the regenerativemo du lator operates ataudio frequencies . Essen ­tially the sam e principlesprevail as with the tube cir­cuit

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already performing and thenwe proceeded to show whythis could, indeed, be. It'ssimple enough, but experi­mentation with d rive levelsand biasing are in order forbest results. Also, it shouldbe appreciated that one can­not just throw in any old res­onant circuits or apply anyarbit rary input -signal fre­quency. These all have to berelated acco rd ing to t heequations depicted in theblock diagram . Once thisrelation ship i s obeyed .numerous frequency rangesand division ratios can beaccommodated, however,

Fig. S. An experimental transis tor version of a regenerativemodulator. Although this example circuit operates at lowaudio frequencies, the basic idea is applicable to radio ire­auencies as ....·elf.

vacuum tube, thi s tack has anatural relevancv. Once thetube circuitry is understood,no new concepts need bedealt with in grasping theperformance of sol id-statecounterparts of the scheme.

With regard to the tubesused in Fig , 4, almost anyother tubes can be made towork equally well. It is, how­ever, particularly convenientto use one multi-grid tube,such as a converter or a pen­tode with external connec­tion to the suppressor grid .The rea son forthis is that thefirst tube is required to out­put a difference frequencyre sulting from in p u tsimpressed with two frequen­cies. the input f requ ency anda fed-back frequency.

Note in fig . 4 that theinput frequency is 3 MHz,which is appl ied to the con­trol grid . Next. postponingexplanation for the moment,it can be observed that thesuppressor fo r any other grido f a multi -grid tube) i simpressed with a frequencyof 2 MHz. That being thecase, it follows that the 1­MHz tank circu it in the out­put of th is stage serves too p t im ize the 1-MH z beatfrequency produced by non­l inea r interact ion of t heinput frequencies with in thetube. This, of course, is simi­lar to the operation of mix­er s in su p e rh e t e ro d y nereceivers, In this particularapplication, however, wenaturally ask what keeps thep roces s going-in otherwords, why shou ld the 2­MHz input ob lig inglyappear!

The neat little trick that isused utilizes the seco ndtube as a frequency mult i­plier. It is driven by the 1­MHz frequency we alreadyassumed was generated bythe first tube. The resonanttank in the output circuit ofthe frequency-multipliertube supports the required 2­MHz feedback frequency.

But that is where we camein! Admittedly, a little trick­ery wa s indulged i n thi sexplanation because it wasassumed that the circu it was

30 73 10f Radio Amateurs • February, 1986

o sc il l a to r i s f a c i litatedbecause pure-wave osci lla­tors tend to be more stablet han t hose prod ucing har­monic- rich wavefo rms .(A lso, this techn ique circum­vents troubles w ith " bird ies"and sp u r ious re sp on se swhich would result f rom anosci llator rich in harrnonics.I

Fig. 7 shows the sim plif iedc ircu it o f a superhet-receiv­er front end in which thelocal o scillator covers a fre-quency range wh ich is onlyone-third as high as wouldbe needed in the " conven-t iona l" approac h. Despitethe fact that the osci l latorf req uenc y is th is low, thesam e range o f signal fre­quencies is responded to aswhen conventional oscilla­tor frequencies are used. It isas if a frequency mul t ipl ier

output" f rom such osci l la- (a t ripier, in this case) wereto rs is incorrect. But without inserted between the oscil­harmonic generat ion, how l ato r and mixer. Indeed,can such an oscillator per- such a f requency multiplierform its intended frequency- would accomplish about thetrans lation function in the same objective -permittingm ixer stage of the receiver? higher osci llator stabi l ity to

Here we must del ve a bit be attained because of low­into the mathematics of het- er oscillator frequency. Aserodyning. It turns out that po inted out. however, bo thwith a certain proviso, an frequency multiplying andappropriate mixer or con- heterodyn ing a re readil yve rte r st age ca n pro d u ce accompl ished with in a suffi­beat f requenc ies according c i e n tlv n o n l in ea r m ixe rto the rel ationship: f = w ± nq, stage.where w is the incoming sig- The HT m ixer of Fig. 7 isnal frequency (fr o m the only marginally nonlinearantenna). q is the local-osc il- enough for the purpose andlator frequency, and n is any does not produce high con­who le nu mber. Th is being version gai n. A bipolar t ran­the case it is a straightfor- siste r wou ld be better in thisward m atterfor select ing the respect, but the HT circu itdesired i-f v ia resonance in tend s to be superior in signal­the i-f transformer windings. to-no ise ratio. In either case,

The provi so for thi s oscillator drive is crit ical forschem e to work is that the optimum performance be­mixer o r conve rte r mu st cause the requ irements fo rhav e a tr an sf er cha r - harmonicgenerationandhet­ectertstt c descr ibed by an erodvrung are not quite theexponent greater than 2. same. Although this c ircuitWhen this stipulation is met, fell ou t o f favor w ith thethat is, when the mixer is suf- advent o f high-frequencyfic iently no n linear, the transistors, there has beenneeded harmonics are gen- renewed interest as expert­erated in the mixer. Accord- m entation is carried out foringly, a harm on ic-rich oscil- satell ite commun ic ationslator is not needed. equipment. Additionally,

The overall result is sim i- the technique is not uncom­lar to what one might obtain man in millimeter radar andfrom an oscillator w ith ha r- communications technolo­monies, but the des ign of the gv.

73 for Radio Amateurs · February, 1986 31

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Fig. 7. Simplified circuit of the "business end" o f a superhet,w ith subharmo nic oscillator. Contrary to common assump­t ion, the oscillator does not provide harmonics of its fun­damental frequenc y. Rather, the needed frequency multi­p/icarion takes place in the m ixer.

The Subharmonic Loca lOscillator

An interest ing c i rc u i ttechnique that has been inand out of fashion over theyea rs is the subm ult ip le orsubha rmonic lo cal osct l!a­to r i n a supe rheterodyner ece i ve r . Ba sically, t hescheme consists of using anoscillator with some frac­tion of the needed f requen­cy in order to convert theincom ing signa l to the prop­er i-f band , This being thecase. it often has been erro­neously supposed that thi s isfeasible by virtue of the har­monic s generated by t heosci llator. To see that this isnot t he modus operandi,one m ust appreciate the rea­son such an arrangement isused in the first place.

In UHF and m icrowaveapplications, it is not alwayseasy to obtain the desiredf requency stabil ity f rom thelocal osci llator. If. however,the oscillator could operateat one-half or, say, o ne-th irdof the needed f requenc y.the stabil ity problem tendst o be grea t ly a lleviated .However, it is also t rue thatreall y stab le o scillators pro­du c e nearly pure wave­forms. i.e., sine waves with­out much harmoni c energy.So for this reason the com­m onl y assumed " harmonic

dev ice wa s extin ct, thinkagain-there remain severalsem icond ucto r manufactur­ers tha t st i l l m ake germanl­um power t ransisto rs. Andthe synchronous rec tif ier iso ne of the applications theyare pushing. This all comesabout because VCE (sa t) forthese devi ces is only abou t0,2 vol t s. Note that th is ismuch less than the 0.65 voltsor so for the silicon rect ify­ing diode. For h igh currents,it is al so less than the volt­age drop produced by ger­manium rectifyi ng diodes. Ifyou are rectifyin g five voltsat several tens of Amperes, afew tenths of a volt can bevery signif icant in terms o fd issipation and eff iciency.

The synchronous rec t ifierhas had i ts ups and downs.In its tube version, it neverreally had much to offer­there was no part icularadvantage in most cases inusing it in lieu of conven­tional rectifier ci rcu its. Andin so lid-state practice therehave been myr iads of dedi­c a t ed ju nction re ctifierdiodes availab le for serv icein simple rectifier circuits.Nonetheless, we find thatpower -supp l y engi neershave found a new vi rtue inthis old technique.

Rough ly analogous tubeand transi stor ve rsio ns o fhalf-wave synchronous rec­tifiers are shown in Fig 6.The tube version is duckso up to imple ment becausenothing bad happens whenthe plate polarity reverses.In the transistor version, pre­cau t ions have to be taken toprevent reverse lo ad currentfrom finding a conductivepa th bac k t o the emitter.Otherwise, the fac t that theo utput pola rities of the rec­tified current are different inthe two circu its is not signif­k a n t - i t comes aboutbecause the tube is an NPNdevice and the power t ran­sisto r shown is PNP.

Semiconductor f irm s arenow d e velopin g sp eci a lpower-MOSHT devices forsy nc hro no us-rec t i f ier se r­vice at higher voltages andhigher f requencies.

Fig. 10. A somewhat beuer arrangement fo r receiving SSB signals w ith a n older set. tn th issetup, the signaf-frequency injec tion takes place following one or more rf stages. Also, theuse of a synthesizer is sugges ted.

32 73 for Radio Amateurs • February, 1986

very possibly, better tube lifecan accrue from this nontra­d itional approach. Indeed ,one of the rewa rding th in gsa bo ut revi ewing o lde r ci r­c uit tec hniques is the real i­zation that the y can be eitherre surre cted o r improvedus ing mod ern t echnolo gya nd pract ice s.

It you are willing to buythe current-dependent con­ce pt of filament operat ion.the ne xt ste p sho uld a lmostsuggest itself -the use of acurrent-regul a ted dc supply.O ne answer to why suc h atechn iq ue d id not ga in foot ­ing with yesteryear 's hams istha t a high-curre nt regulated­power sup ply sui tabl e forpowering tube fil a me nts wasnot an easy thing to build inpre-solid-state days. Its in i­tia l cost a s well a s its bu lkand low effic ie nc y wo ul dce rta inly ha ve proved di s­couraging . Today, it is a trivi­a l matter to const ruct mex­pensive and compact regu­lated supplies. One al so hasthe choice of using the series­pass " linea r" approac h, o rfo r grea ter e fficiency, theswitc hing tec hnique. More­ove r, it is jus t as easy t om ake a c o ns ta nt -c u rre ntsupply as it is to make themo re conve ntio n a l con ­sta nt-vo ltage supply.

O ne reason fo r going toco nsta nt-c urre nt opera tionhas al ready been cited-thebasic dependency o f elec­tron emiss ion o n he at-pro­ducing c urrent. Another rea­son is the beautiful situa tionwh ereby the f il ament isc a u se d to o pe rate at t hesa me temperature despiteva ri at ions in the socket-eon-­tact resista nce. That is thenice thing a bo ut a current­regulated s u p p ly-eve nthoug h the ove ra ll load rests­ta nce may vary, load currentrema ins constant! Althougha vol tage-regu la ted supplywould gain us freedom fromthe effects of ac line vo ltageva riation, tube-socke t resis­tance variations would stillaffec t the true fila ment volt­age and its result ing c urrent!

Summa riz ing o ur revampof the trad itional method of

c lea n, d ry atmosphe re )therewill be a negl igible differ­e nce between the measuredvo ltage a nd the vo lt ageactua lly a pplied to the fila­ment But under ave ra ge toworst conditions (a high-cur­rent f ilament, a not-so-won­derfu l socke t that has see n abit o f service, a nd a poll utedan d/or mo ist at mosphere)the vo ltage indi cated by themeter will be more than tha tactua lly getting to the fil a­ment leadwire s w ithin thetube.

The very worst situat io n isus ua lly wit h high-c u rre nt,low-voltage fil a m e n t s inhigh-power tubes, for thenthe vo lta ge drop due to con­tact resi stance tends to bea n appreciable percentageof the inte nded o r spec ifiedvoltage . Co ntact re sistanceun fo rtu nate ly var ie s withspo t temperatu re , contactpressure, and with surfacecond itions of the contact ingmetal s. Corro sion may ormay not be obvious.

The second matter has todo with the basic not ion ofmainta ining a near-constantfilament voltage. In perus­ing olde r lite ra ture on tubeoperation , I found tha t itappea rs that the true objec­ti ve is to m a intain a p re­sc ribed nea r-constant cur­rent through the fi lament.Afte r all, thermionic e mis­sio n is dependent upon fila­ment temperature, which ismore directly a funct ion ofc urre nt than of vo ltage . Thismay see m like sp litti ng ha irs,but it will be shown that bet­ter opera ting cond itions and,

ElEGUT OLDco.... U'" 'CAT IO" S"£CE ,vE R

key-down o pe ra t ion ca n eas­ily fa ll o u tside of thi s narrowtolera nce. And it goes with­o ut saying that the acc uracya nd re ad a bil ity o f a nalogvoltmeters have often con­t ribu ted to a n i llu sion o fadherence to speci fied oper­arion . There a re a lso a cou­ple of other matters pertain­ing t o c o ns t a n t -vo ltageope ra t ion of tube fila mentsthat, in this a uthor's o pinion,have not been accorded de­se rv ing di scu ssion in thepast.

First , the techn iq ue o fmeasuring filament vo ltageby co nnecting the vo ltme te rac ross the tu be-socket ter­minal s can be responsib lefo r e rrors of seve ra l percenteven if o ne uses a modernhigh-prec ision d igital meter.Th is pitfall ste ms from thecontact resistance betweenthe soc ket and the tu be pin s.Under be st cond it io ns (alow-current filament, a newhigh-q ua lity socke t, and a

Fig . 9 . Signa l -frequencyinjection technique for SSBrecept ion us ing an olderreceiver. The signal-frequen­cy source is adjustable in fre­quency and in amp litude.

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Transmitter-TubeFilaments and a BetterWay to Fly

For many yea rs the hamha s been adm on ish ed bytube makers to m aintain thefilament voltage of his t rans­mitting tubes w ithi n a pre­scribed range. For optimumperformance and life spa n,this range is o f ten ci ted asplus or minus five percent.Thi s ha sn 't a lway s beenreadily fea sibl e for a num­ber of rea son s. The va ria ­t io ns due to swings in theuti li ty v o lt age and tho seaccom pany ing key-up and

L__'== :(): 'lOV&01+'

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RU >STAN CE•

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that are capableof good SSBperformance w ith signal-fre­q ue ncy inj e ct ion . Buttodav's ham has a new cir­cu it ry techn ique in his tec h­nica l arsenal-the frequen­cy synthesizer . I have notseen evidence of the use ofthe frequency syn thes izerf o r suc h a purpo se andwould like to suggest it . Itwou ld ap pea r that a veryeffec t ive overall receiv ingsystem for SSB cou ld now beimplemented by the associ­ation of a frequency synthe­sizer with an o lder commu­n icati ons re c e i ver. Thiswould be yet another exam­p le where a nearly-forgottenci rcu it application cou ld beprof itably revived in todev'sham shack.

The scheme depic ted inFig. 10 m akes use of the sug­gested synthesizer and alsoi ncorporates a more desir­ab le method of signal in jec­tion. Advantage is taken ofthe f act that ma ny o ldercom m u nications receivershave one or more tuned rfstages ahead of the mixer orconverter. By injecting thesignal frequency at a poin tfo ll owing one o f these rfstages, rad iat ion of interfer­ence is reduced to a negligi­b le level. Note that th e sur­gery required f or t he setremains minimal .

O f course, other refi ne­m ents w i ll sugges t t hem­selves such as optimizationof time co nstants in the evesystem and possibl y th e sub­sti tut ions of a product detec­tor for the one that sufficedfor AM listening. But the bot­tom line of this discussi oninvol ves the su ggested syn­thesizer, which ei ther wa snot around or d idn't f it hambudgets when signal in jec­ti o n s w ere fir st e xpe ri ­mented w ith. Although olderreceivers are often " boatanchors" with regard to sizeand w eight, some are tru lyclassic when one considersth eir performance. It wou ldbe a shame to relegate sucha set to the scrap heap if asi m p le st r a t age m can beem ployed to remedy a short­com ing o r tw o.•

m ode. Many ham s f o undthat a practica l solution toth is di lemma was signal -fre­quency inject ion. This tech­nique simply made use of astab le osci llator to in ject themissing carrier at the receiv­er's input along with the SSBsignal it self . The scheme, inits simplest form , is depictedin Fig. 9. '

An example of signa l-f re­q uenc y inj ec t ion for thereception o f SSB signa ls is aH alli c ra ft ers m od el SX-25receiver used in conjunctionwith a BC-221 signal genera­tor, result ing in very satisfac­tory reception of BQ-meterSSB stations. In it ial tuningwas done with the receiver.This served to locate the sta­tion; then the BC-221 signalgenerator w as tuned to them issing carrier o f the station,thi s being m an ife st bydemodulation of the previ­ously garbled aud io whic hnow became intelligible.

The significant aspect o fthis techn iq ue wa s that theSSB statio n remained intelli­gible for lo ng per iod s o ftime-there wa s little ten ­dency for it to slide into Don­ald Duck lingo . What th issays, of course, is that thefrequency stabili ty of theBC-221 signal generator wasex ceeding ly good -muc hbetter th an the i-f bfo in thereceiver. In terestingly, theBC-221 osc i ll a to r is self ­excited . Think , then , howmuch better stabi lity m ightbe derived from a crys ta losc i l lator.

We are rapidly homing inon an interest in g d e si gntechnique, resurrecting theu se of si g na l- f re q u e nc yinjec t ion. You can bet yourboots that hams of that peri­od also made use of the vxofor injecting the missing car­ri er of SS B sig n a ls . Ofco urse, one of the shortcom­ings of the vxo is its inabi lityto provide w ide frequencycoverage. This can be reme­died via the use of multiplecrysta ls and this, indeed, wa salso resorted to.

lt so happens that m anyhams still have elegant oldcom m unicat io ns receivers

crete: You adjust for a volt­age reading with a rheostato r autotransformer - that 'ssimply th e w ay it has alwaysbeen done! I can 't help won­dering if it is sub lim ina llysuspec ted that the constant­current tech n ique m igh tlead to more w idely-spacedtu be replacements becauseof greater longev ity ! (Con­st a n t-c u r re n t o pe r a t ionw ould do away with high­inrush cu rrent to cold fila­ments- a hfe-span-red ucmgphenomeno n.)

30 or 50 watts output16 DB GaAs FET pre-ampFits on most car doorsMic hang-up clipicom.Yaesu,Kenwood2Meters &70 cm

powering transmitting-tubefilaments , we have agreed(hopefully) to automatical lyregul ate f i lam ent currentand, although it has not beenexp lici t ly m ent ioned , wehave agreed to the use of de.Thus. a de-current-regulatedsupply will be adjusted top ro vide a pre sc ri bed fila ­ment current and we will letfil ament voltage (vt rue" orotherwise) sw ing around toits heart ' s co ntent. Fig. 8co m pares t he t rad itiona land the proposed methods.In Fig, 8(b), tube-socke t con­tact resistance is not shown Signal-Frequencybecause it is no longer a tee- Injection for SSB-tor affecting thermionic An Updateermssron. An interest i ng circu i t ry

A natural q uest ion w ith tec hnique stem s from theregard to this proposed prac- 50s and 60s, w hen single-nee iswhat do the tube man- sideband com m un ica t ionu f ac ture rs th i nk abou t it? was gaininga foothold in theNot only have I been unable ham bands. It was found thatto ex t ract st ro ng o p inions otherwise-superb rece iversfrom them , but t here has either could not respond tobeen little consistency in the SS B signa ls o r were verymeager in formation that has unstabl e when the i-f beat-been forthcoming. For one f re q uency oscilla t o r w asthing, their feet are in con- u sed to demodu late t ha t

34 73 for Radio Amateurs . February, 1986

April 25. 26. 27. 1986Hara Arena and Exhibit ion Center - Dayton. OhioMeet your amateur radio friends from all over the world at the internationallyfamous Dayton HAMVENTION.

seating will be limited for Grand Banquet and Entertainment on Saturdayevening so please make reservations early.

If you have registered within the last 3 yea rs you will receive a brochu re inJanuary. If not. write Box 44. Dayton, OH 45401.

Nominations are requested for Rad io Amateur of the Year and Special Achieve­ment Awards. Nomination forms are available from Awards Chairman. Box 44.Dayton. OH 4540 1.

For motel rates and reservations write to Harnvention Housing. 1980 KetteringTower. Dayton. OH 45423-1980. Housing information phone. (513) 223-2612.NO RESERVATIONS WILL BE ACCEPTED BY TELEPHONE.

All other inquiries write Box 44. Dayton. OH 45401or phone (513) 433-7720.

ALL Flea Market spaces will be sold in advance ONLY_ NO spaces sold at gate.Entrancefor set-up available starting Wednesday. Special Flea Market telephone(513) 223·0923.Bring your family and enjoy a great weekend in Dayton.

Sponsored by the Dayton Amateur Radio Association. Inc.

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" When You BUY, Say 13" 73 fo r Radio Amateurs · February, 1986 35

Paul Clillord WI\21\XO18 Burton LaneMassapequa NY 11758

Up, Down, and All AroundFit your KDK 2016A with this ten-dollar Scan Can.

•

I f you are the owner of aKOK 2016A, you know

how frustrating it is to findthose repeate rs when youare o n a tr ip. The RepeaterDirectory is of little he lp be­cause I have found that agood number of the li sted re­peaters are no longer on theair. It takes a good amountof dexterity to manua llyswitch th rough three thou­sa nd positions to fi nd a re­peater that is o n the a ir­and even then you have noguarantee of finding one.

So why not end all thatfrustration and build one ofthese "Scan Cans" ?The cost

is low -less than ten dollarsif you have a well -stockedjunk box. The unique modu­la r design lends itself to fu­tu re ex pa nsion with o t he rtypes of func tion mod ules.The circuit is s im p le a ndstra ightforward for ease ofconstruction and trouble­shooting.

Theory of Operation

See the schemat ic in Fig.1. The cloc k ci rcu it, Ut . is anastable osci lla to r. Its fre­quency is determined by thecombina tion of a 10k resis­to r, lOOk variable resistor,and the l -uF capacitor. The

lOOk variable res istor ad­justs the frequen cy rate ofthe clock and the speed atwhich the Scan Can scans.

It is necessary to expla inthe term inology used for 8vo lts and ground . A high (H)is + 8 volts and a low [l.] isground.

The fu nction of U2a pin 1and U3c is to control thescan fun cti on . When U2a ishigh, the clock pu lses on pin2 are passed through to theinputof U2c and inverted byU2c to the clock input of U4pin 1. The function of U2c isto p ro vide a two-phase

clo ck for futu re develop­ment. When 51 is in position1, the l OOk resistor pulls U2apin 1 to H and al lows theun it to scan. When $1 is inposit io n 3, at L, sc a nn ingsto ps.

In the same manner, thecombinat ion of U3c. U7b,and Ql contro l the ReceiveHold fu nction of the ScanCan. Ql serves as a buffe rswitc h and inte rfaces withthe receive LEO of the KDK.A z-volt potentia l on thebase of Q1 forces the co llec­tor to go low. When U7b pinsS and 6 are l , then pin 4 ofU7b goes H. When U3b pin

Phot o A. The Scan Can show ing the board layo ut.

36 73 fo r Radio Amateurs . February, 1986

Photo B. The Scan Can mounted in operaring posirion onrhe KDK.

..• . - I. .' ., < ,

"~ ,!.v

r.,

H~ ui,

,,"

0-"H~,,,

4 ) Pla ce t he connecto rinto the hole. ce nte r-punc hconnector mo un ting holes.a nd dr ill for #4 sc rews Ia #33dri ll).

5) Wi re connecto r as perthe schematic. Note: I usedflat ribbo n ca ble for th is a ndthe cable should be at leastsix inches lo ng.

6) Mount the connectorwith #440 screws a nd feedthe cable from the bottomc lose to the front pane lthrou gh to the top.

7) Reso lder t he speakerleads and insta ll the bottomcover.

8) Lift t he synthesize rboa rd. There a re six sc rewsholding this board down.

9) Loca te IC-1 1 and IC-1 2to dete rmine the location ofthe proper pins that you willbe soldering to (see Fig. 2).

,n

,.: ,"~ ,

"

,

,r<\u,. r.

IC· " IC-It

, , • • , ,• , ""

,,

~, I I -, I, I ,},,,

, I I~

I ~~ ,/,

'" -1Ilvl

~

)~

1,~

J.Fig. 2. The Scen-Cer-to-Ktstc interface.

73 for Radio Amateurs • February, 1986 37

Int erfacing to the KOK

Inte rfaci ng to the KDK isfairl y simple a nd should no tbe too d iffic u lt fo r t hosewho have worked inside theunit before. The steps takento wire in the modif ica tio na re as foll ows:

1) Remove both the topa nd bottom covers from theKDK .

2) Unsolder the speakerwi res from the bottomcover.

3) W ith the female 0 con­nector as a guide. trace itsoutl ine on the front edge ofthe bottom cover. The con­nector should be cente red%" from the edge. Drill ho lesa nd fil e to the sha pe of theconnector. No te: leave therubber pad in place and filethrough it.

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,

,

Fig. 1. Schematic of the Scan Can.

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--17 'AU RU'STOIO S ARE " " "AU "''''C'TOIOS .oR( ~ ,

in terconnect ions may beemployed because the lay­o u t of t h e c irc u it is n otcrit ica l.

It is a lwa ys a good idea tobuzz out the wiri ng of theboard before going a ny fur­t her in t he const ructio n .Please no te: The CMOSc hips u se d a re diode-p ro­tec ted. Howeve r, stat ic dis­c ha rge wi ll damage t he seICs. It is recomme nded thatyou leave them wra pped info il until you a re ready to in­stall them. After the board iscompl eted, it is mounted inthe c hassis using ~ .. space rs.At t h is tim e the boa rd iswi red to the 0 connectorsa nd the switches. I used flatribbo n ca ble to red uce thesize of the wire bund le.

A 4%"-wide by 3 <deep by1%"-high ut ility box was e m­ployed to kee p the moduleas sma ll as possible . D-typecon nec to rs a re used be­ca use of th e ir ruggedne ssa nd the fact tha t they can beused as surface-mou nt con­nectors. Five %" magne ts a ree poxied to the top of theunit to hold the Scan Can inplace whi le connected tothe KDK. Th is magnet a t­t achment allows qui ck re ­mova l of the mod ule whe nnot in use o r when anotherf u nc t io n mo d ul e is to beused.

12 is H, then the counter U4stops counti ng a nd ho ld s.Howeve r, whe n zero volts iso n the b a se of Q1, t h ecounte r re sumes co unt ing.Whe n the scan function is inthe Rece ive Ho ld conditionand 52 pin 1 is placed to anL, the scan is resumed.

When S3 is in posit io n 1,the outputs of US a nd U6 a reswitched open and the in­puts will not appear on theoutputs . This type of ci rcuitis ca lled tri-state logic. Thethree output-level states a rehigh, low, and high Z.

US a nd U6 are quad bilat­e ra l switches. The y can bestbe described as eight inde­pendent single-po le single­th ro w (SPSn sw it c h e s .When 53 is in position 3 a ndat H, the n the switches a re inthe dosed position, allowingthe level s on the input pinsto be present on the o utputpins la be led Al through H' .

The BCD (Bina ry CodedDeci mal) counte r U4 hastwo separate a-bit counte rs.One of t he a-bit cou nters(whose outputs are labeledA, B, C. a nd D) is the 1o-kH zp or t io n , an d th e o t hercounter (w it h outputs la ­beled E, F. G, and H) is the100-kH z portion . U3a andU3b are used as a dec imalten and a decimal one-thou­sand decoder, respectively.When both of the U3a 's in­puts are H, then pin 3 goes L,providing a dock pulse tothe 100-kHz counter, and atthe sa me t ime, U7a invertsthe level a nd resets the 10­kHz counter to a count ofzero . In the sa me man ner,when bot h of the U3b's in­puts a re H, then pin 4 goes Land U2b pin 6 goes H, rese t­t ing the 100-kH z cou nte r toa count of zero.

Construction

The Scan Can shown inPhoto A uses wire-wrap ICsocke ts and ha s fl ea c li ps asterm ina l p ins . These pa rtsare mounted on a perfo­rated vectorboard'" that hasthe correct spac ings fo r ICsockets. Other methods of

TimerDual binary up counterQuad 2·input NAND galeTriple a-rn put NAND gateQuad bilateral switchTransistorD-type connectorD-type connector

on and the hold-scan switchto scan. Turn on power tothe KDK.

A t this point you shouldsee some ac tivity on t heKDK's LED readout. If youdo not, turn off power andrecheck your w irmg. If youdo have activity, adjust the10Qk pot for a scan rate ofapproximately 100 kH z persecond-or to a scan rate ofyou r ow n liking , O bservethat the 10 kH z is steppingfrom zero through nine andthe 1OQ-kHz posit ion also isstepping from zero throughnine. When these criteria aremet, you are ready to go.

Tips for Operation

O pe ra tion of the ScanCan is fairl y simple. How­ever, there are t ricks I havefou nd t hat will help youwhen you operate the unit. Ifound that to stop on thecorrect channel every time Ihad t o pl ace t he 10-kH zsw itc hontheK DK tothe10sposition. The scanner thenstops on the right channel.A not he r thing to know isthat your d isc switch comesin handy when you are indoubt about the correct fre­quency. W hen you turn theon-off switc h of the ScanCan to the off posit ion, youcan use the main d ial as ifthe unit were disconnectedfrom the KDK, W hen a sig­nal l o ck s t he sca n ner o nhold and you wish to oper­ate on that f requency, setthe hold-scan swi tc h to holdThis allows you to t ransmitand receive on this channel.If you are lock ed to a fr e­quency that is in use and youw ish to resume scanni ng,press the resume button andthe scanner wi ll scan to thenext frequ enc y that i s inuse.•

Parts list

NE555CD4520CD401 1CD4023CD40162N2222DA1 5PDA15S

U1U4U3, U7U2U5, U6Q1P1J 1

hand side. Snake t he )1-9wi re through the harness tothis location and solder tothe pin.

12) Locate P22 (8 v), lo­cated at the lower lef t-handcorner of the top board . Inthe same manner as before,snake the 11-10 wi re throughthe harness and solder to thepm.

1 3) The last wire to becon nected i s t he grou ndwire, On the left-hand sideof the chassis you will find aground lug that has a ca pac­itor connected to it. Snakethe wi re as before and solderit to this lug.

14) At thi s point in the in­terface wi ri ng you shou ldcheck that the wi res are con­nected to the co rrect places,using an ohm meter, Afteryou have dete rmined thatthe wiring is co rrect, removethe sc rews hold ing the bot­tom cover and install the topcover and button up, At thispoint you have f inished thewi ring required on the KDK .

Alignment

A t t his point you areready to test the unit out.Care should be used wheninsert ing the ICs. It is a goodidea to ground you rselfwhen inserting these CMOSc h ips . A ft e r you have in­serted them and you a resure that the ci rcui t is w iredcorrect ly, you are ready totest.

Connect the unit to theKD K and turn the KDK up­side down. Have the coverremoved from the moduleso that you can make someadjustments. O n the KDK,set the memory switch to theoff position, Set the maindia l to zero zero zero on theLED readout. On the ScanCan, set the on-off switch to

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no solder bridging of the ad­jacent pads.

10) Remount the board,being careful not to pinchthe wires that you just con­nected.

11 ) Lo cate P9 ( RCV),which is located at the rearof the board on the right-

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The wires that go to theseICs are to be lap-soldered tothe bottom of thi s board .Care should be taken thatyou do not overheat thepads when doing this opera­tion . After you have lap-sol­de red the se eight wi res ,inspect to see that there is

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Photo C. View o f the underside of the KDK. Note the posi­tions of the connectors on the two units and the magnets.

38 73 for Radio Amateurs • February, 1986

"When You Buy, Say 73"

And because it is inherentlyresonant. the KD 14-HW canalso be easily remoted with alength of coax.

The KD14 's flexible, easy­to-get-along-with radiatingelement measures a scant 12inches . At the base is a 3Y4inch impedance transformerthat gives added strength.

The KD 14 half-wave seriesis also available in a collapsa­ble 2-meter version.

Cut your losses andimprove your gain whenyou operate WIth the newLarsen UHF KiiLDUCKlE"KDI4-HW.with no-nonsensewarranty. You can see it atyour favorite amateur dealer.

*For units with BNC output.

73 for Radio Amateurs · February, 1986 39

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Portable radios can be atrade-off. In return for mobilityyou get loss of pcrfonnance.

Well now you can cut yourlosses significantly. AIl youneed is the new Larsen UHFKiiLDUCKlE" KDI4-HWhalf-wave antenna" It's amouthful but it'I1 do your earsa lot ofgood.

Because it's half-wave, theKDI4-HW is fuIlyresonantdespite the poor groundplane portables are facedwith. Under ideal groundplane conditions. it deliversperformance equal to a fullquarter-wave. And that's apowerful improvement overmost portable antennas!

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CB Standard & Special=,;;Microprocessor

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Build a Dynamic DuoAdd a speaker/m ike and a 12-V adapter to your HT.

tpIJ r -- -- -- -i ~ <(J} \' ~"' I

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I II~ " I p,."-..l; '17I • I '.uu

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IS "IT(~

~- ------- "

Dave Marling VE l VQ

Box 53A, RR 1, TU5kerYarmouth County, Nova cccueCanada BOW JMO

M y Yaesu FT-208R syn­thesized two-meter

hand-held was purchasedwith the idea of making itso mething of a universal rig .While waiting for the mail­man to arrive. I had visionsof using it in the car to andfrom work, from hotels andrenta l cars on bus iness tr ips,and even once in a whilefrom my home.

Actual operation from avehicle for an hour or soeach day quickly indicateda couple of thing s thatneeded correcting to make

mobi le life easier; NiCd bat­teries don 't la st nearly aslo ng as one might want, andRC ·58 coax doesn't makethe most flexible of micro­phone cords (especially on acold winter morn ing!).

Speake r/Micropho ne

The external speakerjrni­c rophone (Photos A and B)was the first of the accesso­ries to be built. I must admitto looking long and hard atthe factory unit before seri­ously getting down to thetask of construction . The de­ciding factor, however, wasthe offer of a free mic ro­phone connector by a fe llowham.

Digging through a box ofdiscarded Citizens Band mi­crophones produced an es­thetica lly pleasing one witha defective cartridge. Thissame type of mike was usedon the KDK FM-144-105XRand quite a few 27-MHz rigs.A bit of measuring led me tothe conclusion that a minia­ture s pea ke r could , withsome ca reful inte rna l casetrimming, produce a nice fit.The o ld ca rtridge was dis­carded and the case ha lves,screws, and coil cord werecleaned up with wa rm soapywater for a more present­able appea rance.

The speaker was chosento be c lose to the outside di­ameter of the plastic ringwhich held the original (d is­carded) ca rtridge (see PhotoB). I u sed a Dremel-typehand tool with an edge-cut­t ing disk to remove suff i-

c ient ring height to let thespeake r fit with so me loose­ness between the front andrear case pieces.

A ho le of .203-inch (S .2­mm) diamete r was drilledcompletely through the casefront. Next, a drill of .23+inch diameter (S .9-mm) wasused to partially enlarge thedepth of the hole from theinside. Care should be takennot to let the bit pull itself allthe way th rough . This en­larged h o le was largeenough to accept the newYaes u mik e e leme nt as apress fi t.

If the dri ll wobb les andenlarges the hole, a drop ofru b b er cement, RTV, orother simila r removable ad­hesive can be used to keepthe mike in place . A sma llnotch was cut in the casering to allow the leads fromthe microphone to pass un-

Fig. 1. Speaker/microphone.

Ph oto B. Rear vi ew ofPhotoA. Completedspeaker/ speaker/m ike showing themicrophone. The mike car- microphone location . Thetridge is the dark circle in grommet has been tr immedthe white strip in the middle to allow the speaker to lieof the microphone. flar .40 73 for Radio Amateurs . February, 1986

.....TEO ('''Cult _"0SH"nl'"

..'c ->AUu we EU"( ~'

~,,-s.,•.,~..00..... .. '..'.T.....t·. ". 'u llLE_"OW nESU t,ULU _EU v'E ..-.. ,t"Op~O.. tELt .. t .. ,co" ,,[cnQ<oS

co-t:CTtlfl P1 ~S

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."'"P'2C' 010'" .'f "

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Q $

Pharo C. Inter ior view of thedc regula to r. The plas ticcase a llo w ed m e t o useoversized hea t sink for goodheat d issipat ion.

adapting them for many ofthe mult itude of hand-heldsout there in vacuu m land.Changing the mike element,the co nnec tions, and theconnector should suff ice ifyou r rig uses a simi lar elec­tret cartridge. If you rs takesa sta nd ard (non-electret)type, the PC board won't benecessary.

As for the adapte r, possi­b ly o nly a sim p le adju st ­ment of the potent iometerwill be requ ired . The adjust­ment range w ith the valuesshown is from 8.5 to 12.7volts (w ith 13.8 vo lts inpu t).

Sy nt hes ized two-m eterhand-helds may not be theperfect rig - yet - but a fewaddi t ional accessories cango a long way towards thatgoal. .

I

I _

_ O<lO_ f

".- -

..'U!G r USf D"'0'0 '....""S ~ AC . .,~ ,., •". .. {"2_ ..

, " l{ ~!R ,~,

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l{"fR

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Last Words

Whil e the gadgets d e­scr ibed were built f or theYaesu FT-208R, there is noth­i ng to sto p an yone from

w ill short c ircui t and causethe fuse to blow, effec t ivelyletting you know that some­thing is w rong and needs at­tent ion.

A s c a n be se e n fromPhoto C. the ad apter circui twas bu ilt on a sm all p iece ofPC b oard 1 .5 x 2 in ch e s(38 x 51 mm). This board wasmounted on standoffs (three4-40 screws) in a plastic casethat had previously houseda b u rn t-ou t a c-to-d e w al lada pter.

No PC-b oard layout i ~

g iven sinc e the ci rc ui t i sfai rly easy to m ake by handw ith a resist pen . Po int-to-­point w iring can be used justas well. The heat sink for thepass transistor (T IP42C) ism ade from a scrap of .062­inc h (1.6-mm) aluminum.

Adju stment is simple. In­sert the fused plug into aveh icle c i ga rette- l igh te rsocket. With a YOM con­nected to monitor the volt­age across the output plug,ad just the 1k-Ohrn poten­t iometer for 10.8 volts.

My unit wa s tested f ortwo hours o n con t i nuousone-Amp load . O utput volt­age dropped by less than 0.3volts, and the heat sink wasonly comfortabl y wa rm tothe to uch .

1".

r O"'! ~ Sl()~S ,~ I~C~!S

q u a rter -Wa tt . al thougheighth-Watt could be used.The ca pacitors (except forthe 10 uF, w hi ch is tanta lumbecau se o f the sm a l l sizeneeded) are minia t ure ce­rarmc.

Cigarette-lighter Adapter

Now that I had an exter­na l mi c rophone to m aketalking easier, I looked atthe battery problem. Yaesuwas k ind enough to includethe schematic of a solutionin the FT-208R user's man­ual : a dc regulator circui t topower the un it f rom the cig­arette-lighter receptacle.

M y junk box didn 't co n­ta in the sa me part s, so Imade the necessary changeswh ich are show n in Fig. 4.You w ill note that I left ou tthe current-lim it ing resistorand plug that would al lowm e to cha rge the batteryfrom the car, preferring in­stead a home-bre w con­t rolled-eurrent charge r keptin the shack .

A 15-vo lt, 1/2-Watt zenerhas been added to the inputfor two rea sons. Any spikesover the zener vol tage willbe clipped before reachingthe regulator section, andsecond ly, shou ld the veh i­cle-battery voltage rise overthe 15-volt point, the diode

_ _ llO

II- I ..A1(RI.....

~ • .1. - ' ·•• .., .. I

--- ---j

<:OH(R "0£"'0_ 'CO....{RI ~ Bc AC, '

Fig. 2. PC board, external microphone.

der the speaker rim (via asm all grommet).

The speake r leads weresoldered to the correc t coil­co rd lead s, and t he jun c­ti o ns were covered withhea t-s h r i n k tub ing . Th eleads from the m ike ca r­t ridge as well as the neces­sa ry co m p o ne n ts weresoldered directly to the cop­per ar ea s o n the sma llprinted circuit board .

The board was cut andfiled for a snug fit in thepocket provided in the frontcase half for the high/lowpower switch on the KDK. Ascra p o f ca rp et unde rl ayglued to the rea r case halfkeeps the speaker f rom rat­tling when the case halvesare sc rewed together.

A sma ll piece of alum i­num stn p with a .203-inc h(5.2-mm) ho le in the center isglued to the outside of thefront, as shown in Photo A,to hide any d r illi ng m i s­takes!

The parts are easily ob­tained . The speaker is a 1.75­inch (45-mm), 8-Dhm, 100­mW genera l replacement.The mike cartridge is a re­placement element for the207/208 series of hand-he rdsand is ava ilab le alo ng w itht he connecto r from y ourYaesu dealer. Resistors are

Fig. 3. Parts p lacement, external microphone. Fig. 4. Cigarette-ligh ter adapter.

73 for Radio Amateurs' February,l986 41

-Steve Wolt N08M271 32 Buttt'fnul Ridge RoodNorrh Olmsted OH 44070

Scanning the TR-2400A simple mod for laz y hams- push the button and it scans!

- o-".

2 ~2222..'QI"Cl~'

m- - ...

Fig. 2. Theentireschemar ic.

stant attention . For this rea­son. Ibegan looking longinglyat the newer autoscan HTs.

The feature of ba nd scan­n ing wo u ld give me ju stwhat I wa nted The price ofthe new HT seemed reason­ab le, and my TR-2400 couldbe kept for my darling, al­most-licensed wife. But stopand add up the tota l cost.T he HT is n 't wha t get syou - it's the price of the ac­cessories. I might as well buya full-si ze rad io with all theother bells and whistles . Thebase charger, speake r mike ,battery packs, etc .. reall yboost the price!

I brought out the servicemanual. and after about ahalf-hour of tracing wires itappeared that by switchingthe scan button with a tran­sisto r, the TR-2400 cou ld besca n ned . All one wouldneed for this project was aswitching transistor (2N2222,

,.es--.

~' o "'0' ;;

DD

Fig. 1. The PLL board. 51 isthe scan-busy switch whichis to be modified. The basesof 014 and D15 must behard-wired together. Thecollector of the scan trensis­tor is spliced into the redwire at TJO. The emitter iswired to the top of 022. Thecollector of Q1 7 is taken,through the switch and resis­tor, to the base of the scantransistor.

pointing. The TR-2400 canbe scanned manually bykeeping the scan-down but­ton depressed . This can bet ed io us; it requires your coo-

through the late-night hours.At these times the bands areinactive. and even scanningthe ten memories I find myradio time quiet and disap-

M y Kenwood TR-2400ha ndl e -talki e ha s

served me long and well . It isan especially nice co mpan­ion at work, where r drive

Photo by Joseph A. Clhy

Photo A. Tape afl o f the leads to avo id a short c ircu it.

42 73 for Radio Amateurs · February, 1986

by TAPR

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about t h e p o w er -sup p l yw ires and 11 01, the chokecoming off the battery lead,It is very easy 10 smoke therad i o by p in c h ing o ne ofthese wires, I have done thistwice now.

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f rom the diode is attachedto the collector and the w irefrom n o is soldered to theem itter. Slide the spaghettiover the connect ions.

So far, so good. I had toexperiment wi th the resistorin seriesw ith the base lead . Ifi nally determined that 51k Operationwas the proper value and O peration of the scannerso l d e red on e to the ba se is easy. Push the button andlead . The second wire f rom it scans. It will stop on athe sw itch is then attached cha nnel if a signa l is present.to the re si st or. W rap the There is no delay; the rad iotransistor in tape and place w ill resume scanning whenit against Q23 and Q 24. If the signal is dropped .you have been ext reme ly I ha ve fou nd th at thecarefu l, you' re ready to but- scanner w ill stop on the cen­ton it up. ter f requency about ninety

Very carefully see if you percent of the time. It rarelyh ave b ro ke n a ny o f th e stop s afte r t he signa l hasmany interco nnect ing wi res, been passed.If you have, I st rongly sug- With a new Rad io Shackgest you take a nice lo ng transistor (276-2009) at 79break . Have a cup of coffee, cents and a new 51k resistorwatch a prog ram on TV, visit at two for 19 cents, the totalHawai i. If any of the wires pr ic e comes t o 98 cents.are broken, others wil l prob- Charge yourse lf $30 00 perablv bem the wev when vou hour f or l abor (I he goingatt e m p t to reatta ch t he ratel ). Now, take your profitcover, Do your best. and go out and buy tha t com-

Be es pecial ly careful puter vou have wanted.•

73 for Radio Amateurs a February, 1986 43

will lower its frequency by 5k Hz eac h t ime. O nce thesq uelch cl oses, the radio wi llbegi n scan n ing automati ­cal ly.

The schematic showedthat by connecting points Y-tand n o I wou ld have effec­t ively pu shed the scan-dow nbutton. Y4 can be pi ck ed upeasily o n top of diode 0 22.no is the connection pointfor the red wi re, and I couldnot locate an easy way topic k up that po int . St rippingsome insulat ion back fromthe red w ire provided thatco nnection . H ard -w ir ingt hese wi res gave me t hescan-dow n for w hich I waslooking,

Now I needed a scan volt­age. I could say somethingbrilliant about fi nding this,bu t to tell you the truth aV TVM and some p okin garound was all i t took . Pin 36on the microprocessor is thesquelc h-suppress ion inpu t .This is controlled by Q17.The collec tor o f that t ransis­tor gave me the Iowan sig­na l , h i gh on mute, that Ineeded.

The busy/open sw itc h, auseless entity on my radio,was used to turn the scanneron and off. Take the sw itchoff the board and bend thepins up. A ttac h two w ires tothe top two con tac ts . Re­mount t he switch, bei ngca reful no t to overheat thepads. Hard-wire the base o f0 14 to the base of D15 witha short piece of wire. Thisw ire takes the place of theswitch.

Tak e o ne of the wire sfrom the sw itch and bend avery small hook in its end .W ith the rad io off and thebattery removed, hook thiswire onto the collector pinof Q17. Th is is the centerpin . So lde r the wi re v eryqu ick ly with a low-wattageiron. Don't burn out the t ran­sistor.

So lder a piece of w ireonto the red wire and an­ot her from the top of 022.Put a piece of heat-shrinktub ing o r spa ghetti overthese wires and hook themup to the transistor. The wire

Preparation

t . The day you plan onwork ing on the rig should beyour da y o ff .

2. Th e d a y b efore, dowhatever it is you do to getall you r f rustrations out!

3. Reconcile all relat io nst hat w ere severed in t heabove step,

4 . Ge t a good night ' ssleep. Don't sta rt on the HTuntil after you have you rcoffee, read the paper, etc.

The Modification

Th is m odifi cation is forrad ios with serial numbersbetwee n 006XXXX a nd010XXXX. I w ill describe thesteps, and if you have an­other model you sho uld beable t o impl ement t hechange without too muchtrouble.

The f ront cover needs tobe removed f i rst. Remo vethe battery and take out thetwo sc re ws in the b atterycom par t ment. l ea ve thetwo middle screws on theback cover in place. Takeout the top two screws. Thefront cover can now be re­moved , carefully . There is arat 's nest of interconnect ingwi res, all of them easi ly bro­ken. Pretend it's a bomb.

Remove t he four screwsholding the PlL board inplace. Pull the board downtowa rd the battery compart­ment. The board sho uld nowbe free.

We are now going to workon the sca n-down button. Ichose this one (rather thanthe scan-u p) because it iseasily locatab le. If you rscanning radio locks on achannel yo u are not parti cu­larly fond of , you can reachover an d touch the scan­down button agai n to by­pass that channel. The rad io

" When You Buy, Say 73"

or whatever), a resistor ofabout SOk, and some wire.

The preparation , ho w ­ever, is a little more compli­c at ed . If you have neverworked o n a synthes ized ,m icrap rocessor-cont rol ledHT before, read thi s care­fu lly!

D,H'I" Malll"Y KIN'IKJJll ydall 5Uf'E'fManchf'Ml"T (T (NJO.#)

The RIT StuffClarify your FT-101 E's reception

with this five-component modification.

Fig. 1. Partia l schematic drawings 01 FV-101 vfo before (a) and etter (b) modification 10

include RIT circuitry. Components on the added board are indica ted in (b).

44 73 for Radio Amateurs . February, 1986

kHz of the RIT (clarif ier) cir­cuitry in my tran sceiver. Af­ter several earlier attemptsto move the vfo back andfo rth to catch a stat ionworki ng sp lit freq uency, Ihad lea rned it was prettyfrust rating . Foiled again! Ofcourse, simila r tales of woecan be told about workingEuropean stations on 40SS B, especia lly during con­tests The European s cannotuse sideband above 7100kHz, while the Americanphone subba nd starts 50kHz higher. That's reallystretching an RIT contro l.

After a few of these situa­ti on s, it was c lear that an ex­terna l vfo could be veryhelpful for the kinds of oper­ating that I was doing Earli­er. though. Yae5U had putthe FT-101E model out ofprint, so to speak. This ap­parently was because ofpro jec ted prob le ms ob­taining the sweep tubes tosuppo rt their productionand repl acement require­ments. So. I sta rted checkingou t the used equipment

TO .' ~ 2 _ " 0 '.U. SOO ' C

I

pileup. A littl e tuning foundthem at 14028, but thehordes of calli ng stationswere up around 14.035.

Wf'11, a spread of 7 kHzfe ll smartly beyond the ±5

closer to OXCC, I made amenta l note of the frequen­cy and time. When the twen­ty-fou r-hour clock turnedover to 1300Z, my FT-1 0Hwas set and ready to jo in the

/~"'.!• •~ - - ../

m m

. /

oo ' O~~ 10 ~l"'---lj"" ___ ~ic~ e'2

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'" ". '000 . _' 00 ". ~ "

I \2<16~ e ' l @T oo . '

" 0 " OOOJ~ l I m "" I

The ox bullet in indicatedthat the newest Dxpedi­

tion was expected on20-meter cw about 13OOZ.Since working the ir is landwould pu t me one ste p

and has another advantaget hat we' ll get to in a minute.

Parts Supplie rs

C13, R1 - Radio Shack; Circui t Specialists, Box 3047, Scotts.dale AZ 85257.C67-Semiconductor Surplus. 2822 N. 32nd Street, Unit 1,Phoenix AZ 85018-C14-Circuil Spec ialists.D1-Electronic d istributors, e.p., Hatry"s, Ledyard Street,Hartford CT. RCA SK3126 & Workman WEP200 are equivalentto the 1S2236. Distributors w ill also carry many/all of theabove components.

The RIT ci rcuit ry board isinstal led inside the vto mod­u le. I fo und t hat m ount ingthis board to the removablebottom cover o f the viomodu le was the most con­venient . Access to this coveris gained by removing thecab inet and tu rning the unitupside down I used a cou­pit> o i machine screws andsm all ('Ii ·inch) metal stand­off .. f or the rnountmg hard­w are. The board w as pos i­t io ned near the rear of thecover plate (on the inside).A I this po in t, the extra ad­vantage o f the PC board ap­proach becomes apparent.This is simply that theground connection betweenthe v fo and RtT cucurts isautoma t ica ll y es tabl ishedb y the PC board 's groundfo il Be sure 10 make thisground connection with aseparate wire if you elect toUS{' an unclad pert board foryour work.

market . I realized qu ickl ythat w hen an FV-1 01 B ex­terna l vto (lid turn up, it in­evi tably was bought veryquickly. In time, though, Imanaged to find an olderversion (FV-101) that was in­ten d ed f or th e ea rli e r~T-101s. Thp popu la rity ofthis accessory was indicatedby the used price beingabove it s orig inal value.

After first checkin g theunit out. it appea red to wo rkas It should However, whenI set the vto selector switchto external transceive. I no ­ticed that th e RlT cont ro l onthe f T-101's f ron t paneldidn't have any effect Nordid the RlT ci rcuitry workw hen the remote vfo wasused to contro l on ly the re­ce ivi ng treq uenc v . Thi sseemed curious since i t cer­tainly is useful to have fullRlT capability fOI both vfos.

Det ermined to correc tt he p ro blem. I pulled ou tthe two owner's manualsand studied the schematicsfor each vfo Thi .. showedthat nothing was wrong withmy " p reviou slv -ow ned"FV-101 . Yaesu Simply hadnot put the RIT circuitry init. If you examine Fig 1, youwi ll see that only f ive com­ponents need to be added tothe FV-101 1he remain ingcircuitry is contained With inthe transceiver. None of thecomponents is diff icult toget. for your ref erence. sev­era l suppliers art> listed inthe box. Undoubtedly. thereare others as well The tota lcos t of the componentsshou ld be around five dol ­lars, assuming that you r junkbox is empty.

So this became the latestho m e-b rew const ructionproject for me. It seems thatthe way many o f these wo rkout is that what electrica llylooks like child's play oftenturns out to be rat her in­volved mechanica ll y. Thisprincipally is because thecompactness o f our modernrigs leaves little room for fm­aers a nd too l s Rel ax,though; much to M urphy'sa maze me nt. this r nodiflc a­l io n is a breeze!

W hat is necessary, ofcourse, is to add the ve rac­tor diode (0 1) and it s associ­ated ci rc u it ry inside the re­mote vfo and connect it tothe transceiver. The circu it­ry itself is not d ifficult to un­derstand conceptual ly. Alow dc voltage is appl ied atpoint A In Fig. 1 (b) by meansof a connect ion to the RITcontrol on the FT-101E/EElfXf ron t panel. Thi s voltage isapplied to the va rac tordiode th rough a current ­hmitmg resistor and this isva ried by the sett ing o f theRIT po tentio meter on thet ransceiver's f ront panel

A primary characteristicof varactor diodes is that thecapac itance across the P-Ndepl etion "one c ha ngesWith t he- app lied voltage.This capacitance is non-line­ar and is proportional to thesquare or cube root o f thevo lt age. The act ua l capac i­tance range o btained in th ismanner is in the order of afew pF depending upon thed iode's reverse breakdownvoltage an d i ts forward con­ductio n. Those who wan t toexperiment might try using arectifier diode. If you are in ­terested in re-ad ing fu rtherabou t these diodes. a morecom prehens ive discu ssioncan be found in References1 and 2. The veractor capac­itance, acti ng together withte rn perat u re-com pensatedseries capac i tor C14, pro­vides the mcrernenta l fre­quency change as the RITpot is va ried . A relay insidethe transceiver is used to dis­able th is circui try duringt ransmit .

The point that the RIT cir­cu i t funct ions at de is im por­tent because th is m ean s thatco m pon ent p lace m e nt,stray lead capacitanc e, etc .,will not affect performanceas they do in m any rf cir­CUl tS. The com ponents th atneed to be added to theFV-101 (except for the feed ­through, C67) can be mount­ed on either perfboard or asmall PC board I prefer th..latter Since it ge nera ll yallows a neater assem bly

fY-101 ci rcu itry mod if ica­tion and a ll that was in­volved was a few compo­nent s and some w ire. lifewou ld surelv be easte r if (1 11eq ui pment modi ficationswere so stra ighttorv....ard

The next step involvesconnecting the remo te vfoto the RII ci rcuu rv in thet ransceiver. f- o r tunatelv. thisis equallv simple. Removethe screw-on cove r fromboth p lugs on the remotevfo ca ble and ins tall ano therpiece o f w ire ins ide thecable jacket . Th is will beeasv to do if you use a coat­hanger or such to pull thewire th roug h t he viny lja cket. Then so lder the neww ire 10 pin 2 of e ach pl ugand put the plug coversback on. This provides aneat cable assembly wi th­out any loose w ires clutte r­ing your deskto p

ow remove the screwsand two small nuts that at- ,tac h the bottom cover to thet ransceiver. Solder a wi ref rom p in 2 o f the FT-1 01 ex-

A length of hookup wi re lerna I vto soc ket to the RITconnects from C1 ~ on the (clarifier) feedth rough ca­board to the side o f l1 that paci tor located on the t rans­is co nnec ted to VC1, etc. ceiver v to moduli ' , Be ca re­Another wi re is run f rom fu l, as thf're are three fped·poin t A to a teedthrough ca- throughs h('re , A YOM canpacitor mounted in the side be used to idennfv the cor­of the vfo module adjacent rect one since it is the onlyto the two existi ng feed- feedt hrough connec ted di­t hroughs In my FV-101, rect lv to the wiper arm Icen­there already was a conve- ter contact) o f the RIT po­nient ho le at that point. You tenttorneter The placementmay find that it is eas ier and of thiS wire between thp jackfaste r to use a screw-in feed- and vfo module IS no tthrough rat he r th an the sol- critica l,der type. Finall y, another Prior to putting the Fv­length of hookup wire con- 101 back in its cabinet , It isnects this new teedthrough necessary to take a momentto pi n 2 on the FV-1 01 rear to al ign its vfo to the m ainsocket wh ich wa s ori ginall y via in the fT -101 , The ext raunused. This completes the added capacitance in the

73 for Radio Amateurs • February, 1986 45

!lU""U "' l '()" " " ~ !lu"n"'O" " 6 '~ ~ " OC"' A I. ,ADAP TO" U,~!lu . T...f ,l ,,'U"" ', ' "_", ,.". " O ,~ "' ."UA, ,... i2 '~

FV-101 T(l is lo cated o nthe lett when viewing downfrom the front panel of theunit , If cl signa l genera tori..n't available. a steadv o n­the-air ea rner signa l willsuf f ice.

w-n. that com pletes thpenure mo dif ication. and thetransceiver bottom coverand the FV-10l cabinet G ill

now be replaced Yousho u ld f ind that tht ' Kif con­trol works regard less o fwhich v to is being used toselect the receive Irequen­cv. If thi s is not the case, goback and check your wir ingIremcrnber Murphy). Again,be su re tha t the new KIT c ir­c u i tr y h a s a com m ongrou nd With the FV-10l it­..pit . 1hope that vou w ill findthi s modification to be a suseful as I have. Good luckin the pileups! .

References1. Radio Communication Hand·book. Fifth Edit ion, RSGB, pp.J. 12.2. Radio Handbook, atst Edi­tion, Orr, pp. 20·29.

circuitry w ill c ha nge theFV-l01 frequency so mewhatand the actual t requencvwill not agree with the d ialca libration mar king s. Allthat is requ ired is a screw­d river adjustment. In it iall y,b oth v i as s ho u ld bechecked aga inst the ca li­brator reference signal inthe n -1 0l ,

Wi th the KI T switch off,inject a signal from an rfgenerator into the radio'santenna connector and unobeat It with the transceivervia. Note the Irequencv onthe t ran sce ive r's d ia l andtune the externa l via to t hesame frequency. The viase lec to r switc h sho u ld beturned to either the Externalor RX ~. \.t posmon so that theFV-10l is controlling thereceive frequencv. Now ad ­jus t TCl with an align mentscrewd rive r to zero bea t therf ge ne rator's signa l. Thf:>reMe two alignment capac i­tor ... (TC1, TC2) and an <K­

Cf'SS hole fo r each is provid­ed in the top cover o f the

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UH5 Encodef/decodel lOterlace .. . 12.50UT-15S UT-15S w/TS·32 IOstalled .. . .. 7995VHf/UHf m ob i/t' mu/ri.modt'! lIegulill SAtEIC·290H 25W2m SSBlF M. TTP mit... 5-49.00 479' \IC-490A l OW 430·440 SSB/FM/CW 649.00 579' \VHf/UHF/l.] GHl FM lIegular SALEIC-27A Compacl25W2mfMwmp mit 369.00 299' \IC·27H Compact 45W 2m FM'limp mit 409 00 l59nIC-J7A Compacl 25W220 FM. ITP rmc 449.00 329l\IC·47,1, Compacl 25W440 FM.np mil: 469 00 399l\

PS·45 Icmpact 8Apower stJpply.. . 112.95 99l\UT·16/EX-388 VOice synthesizer . .. 2995Sp·IO Slim-nne external speaker.. . 29.95

IC·J200A 25W 2m/ 440 FM'lim p 549.00 489' \UT·23 VOIce synthesizer 29.95AH ·32 2m/ 440 Dual Band an tenna 3295

liI rnn PO·K Roof mount 2Q00liIrsen PO·TUli h unk·ll p mount 2018Larsen PO-MM Magnetic mount 19.63

IC·1 271A lOW1.2 GHI SSB/CWBase 999.00 889'\ATV·1 200 ATV mte rtace unit rBAPS·25 In telOal power supply....... 99 00 89' \EX·lIO VOICe synthesiw... ..... ... 39.95UT-1 5S cress encoder/decoder . .. 79.95

IC· 120 IW1.2 GHz fM Mobile .. .. . .. . 499.00 44911

Ml·1 2 1.2 GHIIOWamplifier 339.00 299'1Rt'pt'i1 rl'f) lI@gular SALERp·l OIO 440 MHI. lOWFM. Ital cant. 999.00 899' \Rp·1210 1.2GHI. IOWFM.99 ch.synth ll99 00 1089

Duplew 1210 12 GHz d uJ)le~er l19900 1089Iabmet tOf RP ·1210 249.00

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Phone (216) 585-1318Ohio WATS 1-800-362-0290

::::: ',. \-800-321-)594

Order Toll Free: 1-800-558-0411

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ORLAtlDO. Fi e. 32803 CLEARWATER. Fla. 33575 US YEGAS. tin. 89106 CHICAIiO.llllnols 60630621 Commonlft.lllh AYe. 1898 Drew Street 1072 N. Rancho Orin ERICKSON COMMUNICATIONSPhone (305) 894·3238 Phone (81 ]) 461-4267 Phone (702) 647·3114 54S6 N. M l lwa u k~ Avtnue

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Hf f (/uipmeru lI@gular SALEIC·73 5 Hf nanscewer/Sw rcvr/m« 849 00 729' \

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FL·53A 250 Hz CW fi lter (2nd IF) 96.50 8991

FL·44A SSBfilter (2nd In 15900 144'1HM ·IO Scanning mebrle microphone 39.50SM-6 Desio mIcrophone. ... .. . . ... . . 39.00HM-12 I rna hand mICrophone..... 39 50118·12 MobIle lTI(Junl............... 19 50

O rher A,'(t'" ,,,u·, : lIegulill SALEPS·1 5 2QAexternal power suppl~ 149 00 134'1

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IC-720A 9-band Jcvr _ (CLOSEOUT) _ 134900 699'"PS·15 20A euemat power supply 14900 134' \FL·32 500 HI CWfilter 5950FL·l4 5.2 kHz AM filler 49.508C· !OA Memory back ·up.. . ... . ... . 8.50SIII- 5 g.pm electret deskmil: 39.00118·5 MobIle mounl........ .. ...... 19 50

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Please use WATS lines for Ordering and Price Checks. Forother Infoand Service Dept. please use our Regular lines.

Contact AES®for all of your

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, '- ,WANTED:OLDINKER~~S.

CW Com m un ications, ComputerLand andThe Com puter M useum invite you to send inyour ea rly personal computers, software, a ndmemorabilia - you could win a free trip to

The Computer M useu m in Boston

..

evolut ion o f personal computers and a ca ra­log highlighting theMuseum's col lec­t ions. If your sub­mission is acceptedfor addition to theM useu m collection ,you will be invitedro the grand o pen ­ing of the exhibitand will rece ive abou nd ed it ion ofthe ca ta log. If you r item is selected as one ofthe five best " finds" , you will a lso receive anal l-expense-paid trip to Bosto n for the grando pcru n g party.

So, get up W the at tic,down to the cella r andinto your closets, andtell us what you find !Call o r write the Muse­u m for an officia l entryfo r m, o r send a photoand description of youritems b y Match 1, 1986

W: T he Computer Museum , Perso nal Com'purer Compet it ion, 300 Con gress Sr., M use­urn Wharf, Boston, Massach usetts USA02110, (617) 426·2800, Telex: 62792318.

~k' ">(Computotland'

... C om puter-Land, CW

Cornmunica­[ions, and

The Com'purer M useum

arc workin g to­gether to bring

these ea rly rel icsout o f you r a t tic

and into thecollection of

The Computer Museum. T he museum is es­pecia lly looking for kit mach ines, proto­types, prog rams , Out p ut , newslet ters andme mo rab ilia of early computing fromaround the world. A selection of the finestitems will be used to create an exhibi t o n the

TheComputerMuseum

Your old, dusty " th inker roy" may now beread y to become a treasured museum piece.T he Compute r M useu m in d owntown Bos­ton - an international museu m d edica tedent irely to comp utin g - is searching for thevery best and most un iq ue re lics of the per­sonal co mpute r revo lution.

CWCOMMUNKA.~INC.

Enrnes will be judged on Significance. ranrv. date, complerness and condition. Items parncularlv sought include pre-l 980 machines,early !>erial numbers (get those number I 's ou t), machines made for purchase outside of Noerh America (even modern machines are,,,ught in this curcgorv]; first releases of software such as first releases of operating SYStems, languages and mass-marketed and originalapplications; and pre-I 980 photographs, newsletters. manuals and other records . The Computer Museum is a pnvare non-profneducational institution, All donations are rax-dedccr jble according to the r eovcsoos of the lnrerna l Revenue Service. Thinker Toys isa registered trademark of George ~l u rro...· & Murro...· Designs, Inc.

Rebirth of the Eico 221Turn this flea-market regular into a super-sensitive voltmeter.

Then count the mone y you saved.

~ 'oo

, ~O.

C ~' 02,"...,.e ~tO'

".Dick Dreher \\ '5VT/126-J5 E. Jhl CourtrulS<] Of( 74 14}

B'O,O'

e

I f you have scanned themeter pages of elect ron­

ics c at a lo gs latel y loo k ingfor a meter with high sensi­t ivity, you qu ick ly become" se nsit ive" to high prices.Mosl ham auctions andsa les usua ll y wil l yield a nEiCD 221 for a bo u t fivebucks . Mine cost low, as thetransformer was scorched.

Th is conversion permitsvery sens it ive measure­m e nt s at 10 m ego hm s pervolt in so lid-sta te c ircu it ryand a ppl ica t io ns where d e

power for a VTVM is notread ily avai lable (suc h asmobile gear, etc.). Thoughunab le to m easure currentas some VOMAs and DVMs.its cost and sensft iv itv o ffsetth is shortcoming

M ike Kaufman K6VCI d ida good job on hi s artic le inHam Radio Ma~azine. De­cem ber. 1974 (" How to Con­vert Your VTVM to an IeVoltmeter" ). He shows youhow to convert the HeathIM -1 1. In comparing his art i­

73 for Radio Amateurs . February, 1986 51

"'"'"

""_oc C OL ,"

eece." .

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•

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OHMS

."""'"

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..c- r..~ ·f $

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e

e

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,

L .:,---j ~ J-DC 1'- , -ce 1 -'

I ' ~ oc I ' -ec,,,,••,

R",.

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f i~ . 1. Meter e iter conversion.

... I: ."" "

J0

" , ,." f"H,n' ,,. 3 ~ ..,

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"ecov"', T'OOOv,..»ee"0

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r- - - -- - - - - --- - T- - - - - -- -- - -

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" OC OC., ~o ~ --L-_-!--_-+-_-_T;--_·__-~- ' - - - - T - - - - - - - T - - - - - - -,

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Fig. 1 M iIJ iamme'l'r circuit.

0 ............. " .RES 10" P fR I[ ........... S

PRoal TIP

ISM< lLOEO t.f.Sl

r-------------,, '1002 F 20 ..[<;n ,

, li-

for••~ : -''---'--'-''-'--__c,,_r_L..

l I ~ . a OR :• (OU.L I, ',

. LL.....rQfl :;l'(-'~' - - --<.---+--- - - -'te,P Il . -"

••

..CO .. ..ON TEST e UO

you use the tube sockets forthe new circu it, leave themas is. Enlarge the hole In

the panel where the pilo tlamp holder was 10 1,2-inch(12 .7mm ) d iamete r and

.""'."

the wires on or to Fun ctionor Range switches a t th istime. Cut any of the w iresf rom these SWitches at thechassi s end and tag them asto original connect ions. If

Fig. 4. Meter before convers ion

"'-----~

Dt THT L U D

"9 , ~ " _

" ~" 6X~ POW[ ~ seer

L>"l to'lO m 0 0 ..0

.. ~

""'"'::::;=J -- -- ".0,/

"• r-r- -Fe> , • ' - f ILTE ~

l'00.

.' - • "',..~~ 6~ ~ PEe r "2, 6S~ ' llt .-...

0 0L~ " • ,.,

-'-- ,. -11 ~~ . t ZERO . I),I • ,-.... ......

1" •• • , • ., · OO2 ~ fo • " 0 0

"' ". , sv,., ,." ' "1'" .. ,... r - - - - - -- --- --- -- -- --- - - - -~ - - ..,,, , ,

.", I'" , j'" ,'"."". "

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I, ,

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RI 'OK • n sccv TIOOOV I ..0." ... ... ..-

". ...• 0..-=- BTl

j '"r -- - - --..,- --- ----r-- -- - - , - -;Ol - - 'vee- .,

' 00 , , , , ~ u, ,u=:::J:

, , , , ." ." ,, , , .. .., ,, , , , ,, , , , ,,-~

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0IlC CAL."

clean, except for adjust­ment pots and their wiring,you removed all of theabove parts. Do not distu rb

fig. 1. Rf prahl' c ircu it.

cle with converting the Eico221. I noticed some dif­fe rences.

Thi s art icle w ill show youhow \0 enjoy the origi na lfeatures of the Eieo 221,yet have a meter that istotally battery-operated .Conversion is relatively sim­ple for the average bui lder­hobbyist.

Fig, l shows the meter af­ter conversion It wou ld behelpfu l to have the orig inalconstructio n manual whendoing the modifications. Ididn't enclose photos of theconversion as the text is fai r­ly descr ipt ive,

Note the part s in Fig. 1designated " 100" as " Ul 00"These are new parts youadd , Most are availablefrom Radio Shack, PolyPak s. et c. See the parts l istfor desc riptions

This conversion is begunby removing unnecessarvcomponents See your Licc221 book for parts locationsif they are not clear PartsWith an asterisk (* ) are onthe Funct ion sw itch, S3. Re­move (and put in your junkbox): The ac line cord, On­Off sw it ch (51 ), power trans­former (Tl). pilot lamp t Bl)and holder. all tubes (Vl ­V3). resistors Rl (10k, 2 W ).Rl (33k, 2 W I, R3 (lOkI, R4and R6 (1.5 megohms). R7 (5megohms). R8* (1 megohm).R9 (5 megohms). Rl0 andR11 * (1kJ, capacitors (1 andC5* (0 002 18). (2 (filter), and( 4 * (001 /-IF ), Save ( 4 * forconversio n A lso remove po­tentiometers RS (2 m eg­ohms, Ac Zero Adjust) andR12 (2k, Zero Adjust).

Install Rl0l (15k) in thefront panel hole where R12was. If you st rip the chassis

52 73 for Radio Amateurs . February, 1986

m ount swi tch 5101 (1.5-VBatterv Test sw itch) Thisswitch does two th ings-itf ills a vacant hole. bu t moreimportant. it allows you totest the ohmmeter 1.S-vol tbattery . Break the w ire fromthe Funct io n switch to Jl (dcjack) and wire in this sw itch.Rl02, the l S-megohm resis­tor, can be mounted onRange switch 52.

M ount sw itch 5100 in thehole where the original On­Off sw itc h (51) was located .Batteries B100 and Bl 01may be mounted in specialclips avai lable for them orm ounted to the chassis w ithcable t ies o r st rapping tape.Use connectors that m atethem or make your ownfrom d iscarded 9 0-volt bat ­teries. Batter ies need replac­ing periodical ly, so so lder­ing them is not advisab le.Ul00 can be so ldered intoone of the exis ting tubesocke ts or pu sh out one o fthe tran sform er grommetsand in sert a round ny lon8-pin IC socket in the holeand wire to the socket.

Al l remaini ng parts m aybe w ired to the two rema in­ing sockets or mount toso me 3-lug solder st ripsmounted o n the chassis Aperforated Vectorboa rd "could al so be used . This partof the conversion is m ostlyleft up to the hobbyi st's in­gem ntv. ( 4 wa s on the Func-

at least 600-p iv , 1 -A m ptypes . CR100 clips the nega­tive half of the cycle tog rou nd a fte r cou pli n gthrough capacitor C3. CR101 .Rl04, and R103 "steer" theposit ive ha lf of the cycle tothe Function swit ch andRange switch circui t as dcinput does C4 bypasses anyst ray ac to ground.

8100,8101

Cl00, C102Cl01CR100, CR101

Al00R1 01R102R103

A,04

A,OSR106, 1078 ' 005 101

"'00

Parts Li sts.c-vort transistor battery with connectors(battery holders optional)O.OO5-~F. 5O-vo lt m icaO.OOl·~F.50-volt mica1N4oo5 or equivalent 6oo·piv,1·AmpdiodelOOk, 114 W, 10%POI. 15k, 112 Watt, penei-mc unt type15 meg, 114 Watt . 10%1k, 1/4 Walt, 10% (can use old Rl0 orR11)20 meg, 1/4 Watt, 10% or !2) 10 meg,114 Walt, 10% in series3.3k, 114 Watt , 10%680 Ohms, 1/4 Walt, 10%toggle swi tch, OPSTtoggle swi tch, SPOTIC, Nat ional Semiconductor lM,J10Hvoltage follower

non sw itch and is relocatedon the chassis. Use insula tedhookup wire for all wi ring.l ead dress is not cr i tical, butcapacitors Cl 00. Cl 0l , andCl 02 should be wired closeto Ul00 Rl 0b and Rl07 canbe m ounted o n Functionsw itch 53. Break the w iringto R27 and R29 and insertthem in series. Rl0S is in­serted f rom R30 to 53, deckE. Break wiring to R30 andput in series. Be sure toground the w ire which wentto pi n 3 o n the V2 (65N7)socket and decks D and Eonthe Function switch.

Theory of Operation

C apac it o rs Cl OD andC102 bypass the batteryp ower su pp ly . Di od e sCR102 and CR103 preventan overvoltage condit io n ifyou are probing a large volt­age whi le the meter isswitched to a low-voltagerange. They limi t vo ltage onUl00, pin 3 to ± 9 .0 voltsde.Resistor Rl00 limits currentinto CR102 and CR103 andforms part of the protectivecircu it ry . Ca pac itor ( 101keeps any ac out of Ul00'sinpu t. Its value is not critica lexcept increa sing its valuewill increase the measuringti me. Potentiometer R101 isthe new Zero Adju st pot.

D iodes CR100 and CR101rep lace the origina l 6H6 di­ode circui t. They shou ld be

and chassis and a senous...hock could result. A sug­gested method is to use a6.3-V -a c tran sformer andcal ibrate the meter on the10-V -ac ran ge, compa ringthe reading with a knowngood meter.

A lways turn this meter offwhen not using i t. as theLM-310H draw s about 4 rnAand will consume the ba t-

Calibration teries in a per iod of t ime. AnWith unit power off and LE D Power On ind icator

the 5101 l .5-V Battery Test would consume 20 rnA fromsw itch ...et to De Read, ad- the power supply, so it wasjust the mechanical zero not part o f this co nvers ionsc rew o n the meter unti l the Another usefu l applies-needle points to zero . Turn non in ham radio for thisthe 5100 met er p owe r convers ion is to use an rfsw itch on and ad just the probe into the ac input andZero Ad ju st cont rol (R101 ) measure relat ive power o ut-until l ittle or no change oc- pu t and a nte n na f iel dcu rs when the Func t ion st ren gth. A short p iece ofswitch goe s from +dc to wi re or a clip lead on the- dc w ith no probe input. end o f an rf probe will pickProbe a known dc vo ltage up enough rf energy to giveand adjust the De Cal con- a good reading. Eico had atro] for the correct m eter model PRF-25 probe avail-read ing. Po sit ion the 1.5-V ab le for thi s V1VM, or a sim -Battery Test sw itch to read ple probe may be rnade withthe ohmmeter ba ttery on a 1N48 diode. a 002-jJF,the S-V sca le. You should 600·V ca pacitor. and aread about 1.5 volts on a 20-megohm, 1!2-W att resis-new battery. Posit ion it back tor in a shielded tube or en-to De Read . Next. sw itch the closure. See Fig. 2.Func t ion switch t o the lf vou strll need a rrnlltam-Ohms position and set the meter, the basic movementOhms Adjust control on the here is 0 -1 rnA dc full sca le.f ront panel so the meter Mount a DPDT switch onreads inf inity resistance (on the front panel and wire theleft side of scale) w ith the re- meter term inals to the com-sis t ance probe open -err - m an con tact s. Wire twocu ited (not sho rted to the banana jack s to the normal -ground probe). To uching lv-closed co ntac ts and con-these probes together will nect the two o rigi na l meterbring the needle to read wires to the normally-openzero Ohm... on the right side contacts (see Fig. 3). Theof the meter scale. b anana jacks could be

Never leave the meter in mounted o n the back of thethe Ohms position or 5101 in cab ine t. O f course. the mainthe 1.S-V Battery Test posi- on-off sw itc h stays off to uset ion as the latter d isables the t he l-mA function . By exper-meter f rom reading dc and imenting w ith resistor shuntsthe first is normal proce- ac ross the banana jacks, thisdure. The battery cou ld l-mA ran ge ca n be extendedd rain over a few months. Fi- to seve ral Amps. Start withna lly, put the Fu nc tion about 90 Ohms and go asswitch in the Ac posit ion low as 0 .1 Ohms and com-and adjust the Ac Cal pot p a re t he rea ding withunti l a known ac vo ltage another milliammeter inreads correct ly on the m e- series with th is meter be-ter. Caut io n: Do not use the tween a de power sourceac l ine to cali brate th is me- and a load With the properter as one side of the l ine shunt. this meter sho uldw ill always be on the panel track the known meter. .

73 for Radio Amateurs . February, 1986 53

Dick W Rollema P~05f

li d M ilrck llrililt S

21S2 RA I I'iderdorpN{,ther lil nds

Super-Selectable Bandpass FiltersPA(fJSE usesextraord inary methods to craft the ultimate i-f f ilter.

I t is very co nven ient whenthe bandwidth o f a ham

receiver can be adapted fordiffe rent c i rc u m st ances.That is to say, to the k ind ofsigna l t o be recei ved -te­lephony, telegraphy, RTTY,FAX, etc., and to the interfer­ence caused by other sta­tions which, espec ia l ly onthe HF bands, is practicall yunavoidab le.

Co m m e rc ia l re ce ive r sand tra nsceivers somet imesoffer the possibi lity of se­lectable bandw id th. That isrealized by prov id ing sev­eral i-f filters with differentpassbands t hat can be se­lec ted by a swi tch . In o rderto keep the init ia l p rice low,often a single filter is built inas standard and the ext ra fi l­te rs can be o rd ered sepa­r ate ly fo r a cons iderab leamount o f money. The priceo f i-f filters is the reason thateven the " deluxe" t ransceiv­ers and rece ivers us u ally

provide onl y l imited cho iceo f bandwidth.

For the ho me-brewer w hoc o ns t r u c ts a m od er n re ­ce iver w ith a h igh interme­diate frequency, say over 4MHz, the possibilit ies are nod ifferent than those for thep ro fessio nal d esigner. He,too, must buy a separate, ex­pensive bandpass f ilter forevery va l ue of bandw id thdesired . It is in princip le pos­si b l e fo r the ama te u r t omake his own crysta l filters,but thi s remains a t r ickybusiness and it is diff icu lt, ifnot impossib le, to realize apred ictable bandwidth .

But there is a differentway. W e c an const ru c t am u lti-re sonator bandpassfilter using coi ls and capaci­tors on a relat ively low i-f ­50 kHz for instance. It is notd ifficu lt to make the pass­band wid th o f such a f i lterswitcheble to as many dif-

ferent values as we desire.Such a low i-f dictates theuse o f double- or triple-fre­quency conversion In a su­perheterodyne receiver forthe H F hands in o rder to re­tain a reasonable attenua­tion of i m age re spon se s.That may seem a b it out­dated, but w hen the receiveris caref u ll y designed, thi sshou ld not pose insurmount­able problems. Even in somefam ous commercia l receiv­ers, li ke the Drake, thi s sys­tem is used.

For m\ own ham-shack re­ce iver, w hic h I constructedsome seventeen years ago, Ifo llowed this approach us­ing a fina l intermediate fre­q uen cy of 50 k Hz . T h i sreceiver sti l l copes fu l ly withcondi t ions on the am ateurbands of today. The o rigina lfi lter wa s m ade with sevenca paci tive lv-co upled reso­nan t circu its, and the pass­band w as 2.7 kH z wide.

That wa s OK for singlesi deb a nd , but f or o t he rmodes, like CW and tel e­printi ng with the " he l l" sys­tem (see Hans Evers PAQCX(D JOSAJ, " The Hellscbreiber.A Rediscovery," Ham Rad io,Decem ber, 1979 ), 1began tof e el th e n ee d for so m esma lle r bandwidth s. Thatwa s the reason I replacedthe seven-ci rc uit bandpassfilter with fixed passband byan eight-ci rcu it one havingselec tab le bandwidth. To­gether w ith pa ssband sh ift,th is gives me the capabilityto m atch the receiver ba nd­width to the ac tua l receivingcond i t ions in an o ptim umw ay. This filter is the subjectof thi s arti cle.

It may be o f interest that Iu se a si m i la r filter i n myhomemade sing le-sidebandt ran smitter for the bands 10to 160 m eters. That f i l ter em­p loys six tuned circuits onabout 20 kHz. Sideband and

--l"2"+~ jU2, " •

C2 C2 C2

i"' BJIfTIt' 2.~ '",. ,

• c2- c,k '"s o, ",, '\>'"",- '"••- .. '- .,• 2 ~ 'OC2

" '0 ' 2.~.­

f A'[O!JU OC'r

Fi~_ 1. Basic circuit of a ceoecitiveiv-couo ted bandpass fil­ter.54 73 lor Radio Amateurs . February, 1986

Photo A. The f ilter mounted in PAG'SE's homemade ham­band receiver.

Photo B. View of the filter from the bottom of the rece iver.Coupling capacitors and loading res istors are mounted di­rectl y on the switch decks.

· .earner suppression are ex-tremely good and sta ble a ndthe q uality of the SS B signalca n succes sf ull y co mpetewith any modern concep­tion.

Principle and Design­A Switchable I·' Filter

The princ iple o f an lC fi l­ter with capacitive top co u­pli ng is indi cated in Fig. 1. Atthe left is shown how thepassband is defined as thef requency d ifferen ce be­tween the upper limit. fl. andthe lower limit. fl. tois the so­ca ll ed cen tr al freq uency.The band between f1 and f2 isca lled the passband wit hwidth B.

M odern f ilter theory per­mits one to design a band­pa ss filter u s ing thi sconfi gurat ion with predict­ably exact c ha rac te ristics .That is to say, we can pre­scribe f and f1 and also theslope of the transit ions be­tween the passband and thesto p ba nds b e low f , a n da bove fl '

The values fo r coils a ndca pac itors can be found bycomputa tion a nd a lso in rec­ipe books fo r filte rs. But theawkwa rd th ing a bou t it isth at a ll coil s a nd ca pac ito rsusuall y e nd up with differ­e nt and odd values for self­indu c t an c e an d c apaci­tance - 37.21 pF a nd 9 .82m H o r so. fo r insta nce .When the passba nd widthshou ld be switc ha b !e. th es it ua ti o n be c o m e s eve nmore embarrassing becausethe val ues of all coi ls and ca­pa cit or s h a ve t o b echa nged .

It is eas ier. therefore . forthe a mateur constructor todesign the fi lter according tothe classical " image-pa ra m­eter" method . The disadvan­tage of this approach is thatthe f Iter c ha racteristics cart­not be predi cted exac t lywhen using non-ideal co m­pone nts a nd fil ter term ina­tio ns. Also. the tra ns it io nsbetween p a ss- a nd s to p­bands will be less stee p thanfo r a n opt ima l fi lte r de­signed using modern filter

theory. But the pleasant as­pect of an image-para meterfilte r is that a ll filter sec tionse xce pt the first a nd the lasta re simila r.

Fig. 1 is a pplicable. too.for a filter designed by clas­sica l filter theory. All co ilsha ve t he same self-ind ue ­tance va lue, L, except thefirst and the last coi l; thesehave 21. Also. a ll para lle l ca­p a c itors a re simila r w itlva lue C, except agai n fathe ones in the end sectio nwhich a re of value ( ,/2. Cou­piing capacitors ( 1 are a llsimila r. and they determ inethe width of the passba nd .

let us now take a look atthe formulas in Fi g. 1. Thefirst shows tha t upper lim it f1

of the p a ss b and is dete r­m ined by the resonant fre­que ncy of the pa ra lle l tunedci rcuits on their own. That is,l in para llel with ( 1 fo r theintermediate sec t io ns and2l in pa ra llel with (,/2 forthe end sections .

At lowe r passband limit f1

each coil resonates with thetota l capacitance co n­nec ted to it: fo r the interme­d iate c ircuits. l in para llelwi t h C, + 2C1> and for thefirst and last sec tion. 2l inpa ral lel with ((,/2) + C~ .

With some ap prox im a­tions . the second fo rm u laca n be deri ved from this. a l­lowing us to compute C~ fora desired bandwidth. B. Asa lready stated. th is is an ap­p roxim ation : The a ctualbandwidt h obtai ned can de­viate considerably from thecomputed one. It is useful asa sta rt ing point. howeve r.and the actua l value fo r C1

necessary fo r a certai n ba nd­width , B. ca n b e foundquickl y e noug h by experi­ment .

The third formula is a n im­porta nt one. It ind icates themini mum ci rcuit Q o re ­q uired in o rder to obta in acerta in bandwidth . The nar­rower the passba nd desired.the higher 00has to be. Thisshows why we cannot con­struct the filter for a high in­termediate frequency. Saytha t we want B to be 2.5 kH z

and fo=9 MH z. The m ini­mum ci rcuit qua lity. Qo, inthis case has to betz x 9000y2.5 = 7200. No coil will everbe t hat good . but quart z­c rysta l resona tors are, a ndt hese indeed a re u sed insuc h i-f f ilte rs.

So we s ho u ld s ta rt b ymaking the best coils we ca na t the c hosen intermed iatefrequenc y. fo. (The Q of theca p acito rs is u suall y somuch hig her than tha t of thecoils that Ooof the ci rcuit isse t by O« of the coi ls alone .)For t he frequen c ie s con­cerned. we have to ma ke useof ferrite pot co res and Litzwire . The fe rrite sho uld besuitable fo r the freque nc ywe want to use . The biggerthe pot core. the higher Qobecomes . Also, we shouldtry to fill the space inside thepot core co m p le te ly withthe wind ing. How the 0 ofthe ci rcuit can be measuredw il l be shown late r.

For my own filter, with foabout 50 kHz, I used l -inchferri te pot cores of Phili psmanufactu re . It is a now-ob­so le te t ype, des ignated asK300063 . The coil has a slugfor fine-tuning. No d ou btsuita ble ferrite pot cores ofother manufac ture can beobta ined outs ide my coun­t ry.

I t ried severa l ty pes ofLitz wire from my junk box.eve n home-brew, made bytwisting two insulated 0.25­mm (30 AWe) wires. But thehighest Q was obta ined by

using 28 x 0.05 Litz wire (28stra nds of 0.05~mm diame­ter) that was kindl y providedby PAQlQ from his personalstore. Oo va ries a bit fromcoi l to co il bu t is of the orderof about 370.

We now know the mini­m u m pa ssband w id t h wecan o bta in. because fromthe third fo rmu la comesBm ," = 2fJQo, and 2 x S()()()()!370 = 270 Hz. We can ge teven narrower passband s.but the inse rtion loss in thepa ss b a nd then inc reasesq uickly. The tu ned circuitsbe come und ercoupled ­something you may remem­ber from the theory of dou­ble-tuned ci rcuits .

Fi nall y we ha ve the fourthfo rmul a . Th at o ne statestha t the e nd sections of thefilte r shouu ld be loaded by aresistor the va lue of which isequa l to the reactance ofthe coupling capacitors. C1.

This is not very critica l. Wema y use a so mewhat greaterva lue fo r R tha n the form ulaprescribes. but if we go toohigh. ripples in the passbanda ppea r. We should a lso rea l­ize that the loadi ng resisto r,R. assumes theore tica l, thatis. lo ssless. coi ls. In the rea lworld coils do ha ve losses,a nd the losses in the first a ndthe fina l coil a lready pro­vide so me of the load ing.This implies that at the na r­rowest bandwidth the exter­nal loading resisto rs ca n beom itted, as a ll loading is a l­ready provided by the " loss

73 fo r Radio Amateurs . February, 1986 SS

tl ( 1

capac ito r as fo llows. Fromthe measured Qoof the coils,find the minimum passbandwid th po ssibl e u s ing t hethird formula . Entering thi sbandwidth, B, into the sec­ond formula then gives youthe corresponding ( 2' If younow take ha lf of this va luefor the capac itor that is al­ways in circuit, you will beOK . When the sma ll cou­pling ca pac itors have beenput in, we can sta rt aligningthe filter.

We need some ind icato r,like a VTVM or a scope, andwe couple it lightly to thelast c ircu it, num ber 8 in mycase. Cou pling ca n be donevia a sma ll capacitor. Wealso need some gene rato rtha t is tuned to uppe r fre­quency limit f1 of the filterpassba nd . The generator isconnected in pa ra lle l withci rcuit 7. It does not matterif thi s c ircu it is heav ilyd amped by the ge ne ra to r.We now tune c ircuit 8 formaximum voltage.

Ne xt , the gene rato r ismoved to circuit 6 and num­ber 7 is tuned fo r maximumvo ltage. The n the gene ratoris moved on to c ircuit 5 andcircuit 6 is tuned fo r maxi­mum vo ltage, and so on, 1fthe signa l on the last circuitbecomes too weak .for a re­li a ble ind ication , we movethe indicator to number 7 or6. So we finally come to cir­cuit 1.

The gene rato r is no wlightly co upled to 1 via asma ll capacitor in o rder notto de tun e it unde r the in flu­ence of the generator. Whenci rc u it 1 is also peaked ,a lignment is completed fo rci rcuits 2 to 7. We can fix theslugs with wax to make themstay pu t. Circuits 1 and 8 willget a fina l touch-up once thefilte r is mounted in the re­ce ive r to compensate for thecapacitance of the stagespreceding and following thefilter.

Now yo u can sta rt puttingin the coupling capacitorsfo r the switc h posit ions yo ua re going to use , It is simplya matter of solde ring them

quen cy is just s li ght ly higher,say 2%, than f2• We now canfinall y assemble the coi l a ndinsert the slug . If all is wellwe ca n now t une neatlya round fz'

It a ll sounds a bit compli­ca ted , b u t is t he o n lymethod that guara ntees tun­ing the c irc uits properly tothe correct freque ncy. O nlywhen you are lucky e noug hto have very sma ll tolerancecapacitors availa ble (1 % orbetter) can you wind a ll coilswith the sa me number o fturns, as ca lculated for yourpartic ula r pots to reach thereq u ired se lf- ind uc ta nce.The reason is tha t the slugpermits o nly a sma ll va ria­t ion of the coil's se lf-indue­tance- some 2% o r so.

In this way we proceed foral l the tuned c ircu its, e ightin my case. When the tunedcircuits a re ready, we canmount them on some suit­able suppo rt. How yo u doth is is not so important. Buttry to do it in suc h a way thatinput and output of the filt era re well se pa rated; other­wise some signal ma y by­p a s s th e filter in thestopbands. I used a kind ofc ha nnel made of t in-pla te ­as ca n be see n in the photo­g ra phs . The coils and thepa ra lle l capacito rs a remounted on top; the switc hand the coupling capacitorsare inside the c ha nnel.

The co mplete circu it dia­gram of the filter is shown inFig. 3. The nu mber of di ffe r­e n t pa ssband widt hs thatyou putin is up to you. It willproba bly be de termined bythe kind of switch you haveavail a ble and the number ofequa l-va lued capaci tors inyour junk box. I had a 12-po­sit ion switc h of which 10 po­sitions a re used .

As you ca n see in Fig. 3,there is a sma ll ca pac ito r,3.3 pF in my filter, a lways inci rc uit. This was providedfor a lignment purposes. It isconvenie nt when a ll ci rcuitscan sim ply be tuned to max­imum on a test signa l.

We ca n find a s u ita b leva lue for the sma ll coupling

" ,

'.

o f the co ils were used . The se lf-ind uc­tance of coi ls 1 an d 8 had tohe c o rre c te d for th is, of

Making the Filter course . The co ils for inter-How do we make the ac- media te sections 2 through 7

tual filte r we would li ke to worked out at a self-i ndue­possess? Tha t is large ly d lc- ta nce of 3.74 rnl-i Tha t is atared by what your junk box va lue I calc ul a ted afterprovides in the way of ca- completion of the f ilter be­pacitors of equa l values. J cause, as sta ted alread y. theassume you already possess coils are ind ivid ua lly tai­or can obtain suita ble fe rrite lored to the capacitors theypot cores. W hen we sta rt by are used with .fixing Cc then Lis se t a s well. We sta rt by pu ttin g inaccording to formula one. more tu rns than a re neces­We now try to obtain the sa ry (according to the for­correct l with wire that f ill s mu la provided by the makerthe coil form as mu ch as of the pot cores fo r obtain­possible. (No te that the e nd ing a certai n val ue of self-in­coi ls have double the self-i n- ductance). The coil is nowductance!) If the choice of tempora rily assembled with­Litz wire is li mited , we can out the tu ning slug . We nowal so sta rt by ma king t he rig up the c ircuit o f Fig. 2,C1

coils, filling the coil forms is the capacitor that will becompletely. The self-indue- used with the coil under con­tance, l , is then measu red, struction. C2 a nd CJ are asand from this fo llows C1 • sma ll as possible consistent

Capacitors C, should be with a relia ble ind icat io n onof good q u a li ty , m ica o r the VTVM (a scope can a lsopolysty rene. A sma ll tole r- be used).anceof capacitance va lue is We now tune fo r re so ­nice to have but is not a nan ce , as indi cat e d b y amust. We have to tailor t he ma xim u m o f the vo lt a genumbe r of turns for each in- over the circuit. This is verydividual co il. a nyway. Dif- sha rp! The frequency of res­f e ren c e s of up to 1 0% ona nce will usua ll y be lowe rbetween the individual coils than f2 as defi ned in Fig. 1.a nd ca pacito rs do no ha rm We now remove o ne or twoas long as eac h para llel ci r- tu rns of the coil a nd mea­wit can be tuned exactly to s u re aga in . (That soundsfo. worse than it is: The wire re-

I had a sma ll batch of 2.5- moved is simply lef t in thenF mica ca pacito rs for the circu it; it has negligible in­intermediate sections. For fluence on the frequency ofthe e nd sections, the ca pac- resonance.) During the mea­itors should therefore be 2.5/ surement, I simply press the2 or 1 ,25 nF, but those were two ha lves of the pot corenot avai lable. The junk box toget he r by hand .did p rovide ca pa c it o rs of We go on tak ing off turns1.35 nF, howeve r, so these until t h e re sona nce fre­

56 73 fo r Radio Amateurs • February, 1986

Fig. 2. How unloaded Quality fac tor <20 is measured.

re si s t a nc e "themselves.

ut

. .~,.- .- "- $. ,., " .. "- ' - So "'~j:. .. -". ;.~ ~~ ~~ y'~ . .')~ • V~ ! ~~ ".• -'---J -'---J -'---J

• n . yf- y~ yf- .y~ -y~ Yf- -Yf- • '"". ~~ ~~ -'---Jf- -'.....;~ i~ ~~ ~~

,-'---J -'---J -'---J -'---J -'---J • " .

'" y~ ~~ ~~ ......j~ ......j~ ......j~ y~• -'---J -'---J , '"..~ ~~ i~ ~~ .>.....j~ j~ .>.....j~ .>.....j~ ..~• -'---J -'---J -'---J -'---J..~ i1- i1- ~I- ~I- ~I- ~.~ 11- ..~• -'---J -'---J -'--J -'--J -'--J -'--J -'--J •.~

~I- i1- 11- ~1- ~1- ~1- if.-,,~• '--J '--J -'---J -'---J -'--J -'---J -'---J

,

ii- ii- I _)~ ..)~ ~i- ~i- ii-s-; '--J '--J '--J '--J -'---J s-;r--: f-- '- ~ - f- f- f- ~

.L, .L, .L, -'-0 -'-0 .L, .L, .L, .L,

" -li- n " " " "I I I I

.".f , •,.f • • 'of • "of • ••• f • l '0' , ..' ,I ••••

,.. , ,

i Yn. ...., , , , •y....... 0, "3.... ,

3U~.., .,..... , • 1..... , n ..... , ....... f, , ,

• , , , , , •

ITU"

' ''~'1.' •

Fig. 3. The actual c ircuit diagram o f the fifter with selectable bandwidth. Capacitor values in p icofarads unless designatedof (nano farads). Sa through 5; are the decks o f the bandwidth-selec tor switch.

Posit ion of the switch 1 2 3 4 5 6 7 8 9 10Bandwidth at - 6 dB 132 177 361 638 1.11 1.91 2.70 3.64 7.03 9.36(passband) H' H' H' H' kH' kH' kH, kH, kH' kH'Bandwidth et - 60 dB 580 715 1.04 1.50 2.20 3.41 4.71 6.32 12.2 16.0

H' H' kH, kH, kH, kH, kH' kH, kH, kH'Shape factor

4.4 4.0 2.9 2.3 2.0 1.8 1.7 1.7 1.7 1.7BM dB/B6 dBAttenuat ion at fo with att. in - 7.0 0 - 6.5 - 5.5 - 6.5 - 8.5 - 12 - 15 - 21.5 - 21pos. 2 as reference dB dB dB dB dB dB dB dB dB dB

Table 1.

73 for Radio Ama teurs • February, 1986 57

d irect ly to the switc h co n­tacts and seeing what youget in the way of pa ssband.No furt her alignment is nec­essary , In Fig. 3 you can seewhat I used , a nd Tab le 1gives you the resu Its I o b­tained Position 1 gives thesma llest bandwid th, 132 Hz,and this is wit h onl y the 3..3·pF capacito rs in pla ce. Assta ted. this switc h position isintended for a lignment o nly.but in practice it turned outto be useful as an opera­tio na l posi tion as wel l.

Switc h decks Sa and Si areused to connect the properloading resistors in pa rallelwith the fi rst and the last ci r­cuit. The va lues of these re­sistors can be found easily;they are eq ual to the reac­tance of the total couplingcapaci tance. ( 1. in effect ateach switch position. For po­sitions 2 and 1. no resistor isreq u ired a s t he lo ss re sis­tance of the co ils themselvesprovides the loading.

You see that the resistorsbecome sma lle r as the band­width increases. This meansthat the input resi stance ofthe filter, as "seen" by thest a ge d riv ing it. a lso d e ­creases. And since the am­plif ic at io n o f t he st age

feeding the filter is equal tothe mutual conducta nce ofthe tu be o r transistor multi­plied by the input resistanceof the filter, thi s amplifi ca­tion a lso decreases as the fil ­t e r ba nd w id t h be c om e swider. This effect is slightlycompensated fo r by the factthat the insertion loss of thefilter goes down as the cir­cuits beco me more tightl ycou pled, but this compen­sation is only sma ll becauseth is filter lo ss is only of theorder of one dB fo r the widerbandwidths.

This effec t is also shownin Ta ble 1. The total amplifi­cation between the inpu t ofthe stage preceding the filterand the output of the filterwa s measured for the differ­e nt sw it c h posi t io ns . Theamplificat ion in switc h posi­tion 2 wa s put a t 0 dB as arefe rence . The table shows

what ha ppens in the otherpo si t io ns . Actually, t heval ue in position 10 shouldbe more than - 21 d B, but Icho se to use the same load­ing resist ance. 15k Ohms.for posit ions 9 and 10 in or­der to keep the tota l a mpli­fic a tio n fro m going d o w ntoo much . The underloadi ngin position 10 is noticea bleas a slight ripple in the pass­band tha t does no harm.

Ifirst intended to make thetotal a mplification the samefor all switc h pos itions byswitching in suitable resist iveattenuation networks on theoutput side. and I reserved aswitch deck for that purpose.It is the one nea rest the frontpanel of the receiver in PhotoB. But I finally rejected thatrefinement. The diffe rence inrece iver ga in is hardly notice­able under the compensa tinginfluence of the a utomati c

ga in c o n t ro l. On ly if yo uwould like to have the 5-me­te r ca libra tio n hold fo r allswitch positions should youinclude the loss equalizat ion .My Smeter is used o nly as anuncali brated indicato r.

Table 1 gi ves t he mea­sured ba ndwidth a t - 6 and- 60 dB with respect to themaximum in the pa ssband.From that. the shape factoris c o m p u te d a nd it a p­pro aches 1.7 when the band­width is 2.70 kHz or wider. Avery good figure. I think.

The shape of the fi lter at­tenuation cha rac teristic wasa lso measured. Fig. 4 showstwo of the curves. fo r switc hpositions 5 (1 .11 kHz) and 9(7 kHz). It is shown clea rlythat the upper limit of thepassband remains a t about52 kHz and the lower limitmoves down as the band­width inc reases.

Fig. 5. Block diagramofsecondandthird i-fsections in PAQSE 'sreceiver, incorporating passband shift. Frequencies in kHz.

,...L.,

,,,.,,._ • """,,uCOOC

~..n..

_ . r: -~ .: __1 .

--<-

j it~·/E3

, ~~~flI ,, .,, ,

I , I t -jl I I I I

,t. +.lt+=j

I I -

-mr

o

o

, _.60 -r-r- ---+ ->- I

-+ - •

.-,Fig. 4. Mea sured filter response in sw itch positions 5 and 9.Response continues beyond - 60 dB, but this could not bemeasured with the simple test equipment at PAQSE. t he same amount up o r

down as the shift of the in­put signa l fo r the filter (4).

This is rea lized by mixingthe signa l from oscillator 7also with that from a crystaloscillator at 511 kHz (9) inthe mixer (8). The output sig­na l o f 8 is filtered and it ha sa fr eq uency betwe en 47 .0and 53.18 kHz, just the sameas the signa l at the fi lter in­put that resulted from a 511­kHz signal at the second i-f .

So a lthough it looks as ifthe passband of the filter ismoved ba ck a nd for th overthe signal, in re ali ty the sig­nal is moved up and down atthe filter input and the bfofrequency is moved with it .

There a re a few thi ngs tobe watc hed with thi s system.O ne is that the crysta l oscil­lator(9) and mixer(8) have tobe well screened becausethe 511-kHz signal is in themidd le of the second i-f andeven a sma ll leaka ge signalme an s a sta nd ing signa l inthe rece iver. It is always zerobeat w ith the bfo frequencysignal so it won 't be heard,but it deflects the S-meter.

Also, the o utput signa l ofthe mixer (8) m ust be we ll f il·tered; o therwise bird ies willbe hea rd when the passbandshift control is operated.

Helpful in thi s respectal so is keeping the signalfrom the osci llator (7) in themixer as sma ll a s possibl e . Iman aged to get rid of bird iescom pletely afte r I installeda single-se ct io n low-pass fil­ter with a cutoff frequen cyof about 55 kHz betweenthe m ixer and the produ ctdete ctor.

scribed he re in detail . Onlythe pr inciple w ill be shown,with the help of the blockdiagram, Fig. 5.

The re ceive r ha s a firsttunable i--f of 3.5 to 4.5 MHz.The second i-f is 511 kHz . Se­lec tivity on th is freq ue ncy isprovided by a bandpass fil­ter with fo ur tuned ci rcu its.Bandw idth is a bout 6 kHz.This filter is indicated as 1 inFig. 5. It is followed by anotch filter (2) with adjust­a b le re jection fr e quenc ya nd notch depth . (As men­t io ned, this is more o r le sssupe rf luous w it h the va ri­able i-f filt er now used .) Thesecond i-f at 511 kHz is con­verted to 50 kHz in the mixer(3). This f requency is the dif­ference betw e e n t he 511­kHz signal a nd the osci llatorsigna l from the variab le-fre­quency oscil lator (7). This os­ci llator affects the passbandshift, and its frequency canbe varied between 457.8 2and 464 .0 kHz.

Thi s means that a signalat the center of the secondi-f at 511 kHz can be shiftedbetween 511-457.82 = 53.18kHz a nd 51 1- 464.0= 47 .0kHz . That is to say, the spec­trum of input signa ls o ffe redto the th ird i-f filter a t 50 kHzcan be shifted upwards a nddownwards .

The output s ig nal fromthe switchable ba ndpass fil­ter (4) is am plified (5) a ndpre sented to the prod uct de­tector for conversion to a u­dio . In order to keep thetuned frequency the sa mewhen sh ifting the passband,the osci lla to r s ig na l fo r 6(bfo signa l) shou ld be sh ifted

make sure the extra load ingby generator and indicatordoes not influence our re­sult. we can repeat the mea­su re ment u si ng the ne xtbigger o r smal ler val ue forC2 and C; If the va lue of Qois the same in th is case, weknow we have a good re sult .

Passband Shift

The rece iver in whic h thefilter is used a lso feature spassband shift, o r passbandtu ning as it was ca lled e a r­lier . Th is means that t he

Finding Qo passband can be shifted upThe unloaded quality tee- o r down over the signal with­

tor, Qo. of the parallel tuned o ut affecting the tuning ofci rcuits is also measured us- the receiver. In conju nct ioning the setup in Fig. 2. C, l is w ith the passband width se­the circuit unde r te st. Fi rst lection. thi s offe rs uniq uefind frequency fo of maxi- possibilities fo r getting rid ofmum response. Now detune QRM. With o ne ha nd wethe generator slowly to the move the bandwidth switchfrequencies at which t he to progressively sma lle rvoltage is -3 dB (O.?O? p a ssband s a nd w it h th etimes) with respect to the ot he r we adjus t t he p ass­maxim um voltage. The f r~ band shift to put the pass­quency difference between band in t he optimumthose two points is deaig- position over the receivednated b. signal.

We no w find Q o fr o m In my re ceiver I even haveQo = fo/ b. A fr e qu e n c y a n ad justable notch filter incounter is a lmosta must since t he 511-k Hz i-f pre ced in gthe frequency d ifferences we the fi na l 50-kHz i-f. Th is wasdeal with are very sma ll . The put in when I had the fixedcoils I used have a Q of about 2.7·kHz filter at the final i-f .370, as mentioned earlier. The notch could be used toTha t means that at50k Hz the remove a n interfer ing het­fr eq ue nc y differe nc e be- e rodyne on the wanted sig­tw een th e - 3-d B po in ts is nal . Since I replaced the 2.7­50,000/370 = 135 Hz. kHz filte r with the o ne de-

We do not want to load scribed here , the re is nothe circuit by the internal re- need to touch the notch fil­sistances of generator and ter a ny more .indica tor. Thi s is done by How the passba nd shift iskee ping C2 and CJ smal l. To e ffecte d wil l not be de­

58 73 for Radio Amateurs • February, 1986

The attenuation extendsbeyond 60 dB but I was un­able to measu re deeperdown with the unsophisti­cated test equipment in myhome lab. You can see in Fig.3 that the "cold end" of ci r­cuit 1 is not grou nded butconnected to + 215 V. It isdecoupled by a 68-nF capac­itor. This was done becausethe filter is fed from a pen­tode tube and it receives itsanode voltage via the fi rstci rcuit.

0\

ofTwo·Way

579.95 :;.

A Realistic SimulationOn-the-Air ,Morse Code 'Ragchew'Contacts (0505).

• Makes Upgrading of MorseSkills Ea.sy and Fun

• Does Away With Drudgery• Skilled Operators Enjoy

the Realism• Opt-rate Anyttme-c-Re ­

quires Only a CommodoreCM (or C128) and A TV Set

• Removes the "Mystery" ofwhat to Say in On-t.he-AirContacts

• Excellent Practice for Be­ginners and Old "Pro's"

• Standard Format and Com­mon Abbreviations Usedfor All Exchanges

• Send Morse with your key­board

• Select Appropriate QRl\-Iand QRN Levels

• Select the Portion of the'Baud'-Novice or LowEnd

Now ..... il.b!....IC-."'T

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fJ~1• M""u18 Installs Inellle the red ... In10 m,nutes • 800Bt ."d... to ne.,.,.,one ..eW • Low pow.... dra,n 14m•s""n<!·byj • Compl.te step-by-step,nstrucl.lOns Included . CO.....ctllttleLOW .ud,o problem' • ;:)r,v••• tern.1lpe.'.'" to lull .olume, •••n 1'lIn.11w,th iow de.,etion'

M ODEL CS-64

IncludesSof1;w .....

(Prog,...m OI5~~

H• ...,w.re In~rl.CII

& Instrvct>onManuel

COM-SHACK 64SIMPLEX AUTO~PATCH

& REMOTE H.F. BASE

1..--.----; MODEL OAP·l

~~:. .¢. -,r"··= "iiiC

" '-0= ~ .I , _. r _ _ ··,... -~. ... J -.....- _. ~-=-

TOUCMTONE' DTMF "8 . 8.UI R1Io-2U-C

:wo .... UD INTERFACE

• Use,.....rcompu~w~'~.~.D""tDuchtonn • AIICefY1I •• 16d'll'U..last .. ehey CIIn biI tMlns....ut·ted • E.l6I"'P"Dll",m-,ourcomJlUtllr.. BASIC t<l~ rnultldogit "an••dlSJIloIy ""ll''''' .....nd ., obse......~t coda, control \'8 • s.m-pie to use, ",at pt'OY,d. +12 vac end.ud"" hook two.,..... too the R5-2 3 2 ·C.........1'nputon your computar.enUlf' 5..mpl.. BASIC prog...m end begIn t.odecod" • Sample BASIC pNlflramand InStruct,on. 'ncluded • Oet.indicetor • Wired end eeseed

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-;.,:," S1498 S grlrnm. bl••cce•• cod•••NI "I.d to• M<>d.1 RAf'·1 o,per.te ....I. Y" or oth.r on/ofl lunc-

REMOTE-"'-P"'D" bone . LE O da<:<>d. r lte t"S ,nd,e.-• Aud,o ton.. lrom .ny ..... rca ..... tor1lend momentary plUB ltaady .tate~toaolldatate....'tehes ",t,,(:h deeO<lar outpu ts ..... p......id.d • Allcontrol.ny16d'lI,t kaypedof.radlOor CMOS """' power dre,n (30meJ; s.s.'ot/'Ier d"",e. • Soma ...mplea .,ou 201 Oeaxlar • Hook .'IIht ,.... (4e.n control '''''lulla the Pro-sea""h- towI .n<! 4 coIumne' In pa llel ..>thRotator" lrotate beam rtlmotaly); Re- the e..Il'''II L. ypad 01 the radIO roumotecontf'Oll;. 'CO M IC_701 or ICOM w.." to control Nlmotal, Connect1C-211 when u""11 tl>a RM·2 con- audIO lrom ."y .....n:e. 12 voIU1 o.CtroI......1(._ 7950 & 751; Alden end .,ou .... ion control • T.... d....14F"CS 4000; ".ncI_ ...ch.s Y_u d'O,t daeodals ..ill tum rour linkS onA-208. A-708, ICOM IC-Q2AT; .nd and atl ...."O.,our P"Oll..........bIe ec-rnany ""'"'- a Two Ilour·d'lI, tj pro- .,.. coOa.

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II Hfjl~• SS12D1 DTMFR_ i.... . R_ai, 18 DTMF d'll,t11 • No edd,toIIna't,,-."II • Output BCD or ".. I_....t • 1.0* power [29 ..... 12V1 •1(11 ,,,,,"'dee 3.58 Mhz CI'J'l~l .... PIn'C _kilt. ....",tor. e.pooc,tof'S. det.e_t .nd IIChem.tic8

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Talk.ln on the "Mighty 525" • 145.25 MHzCom. and Inlay a show by our "Quality" Deal...

Prl""" llnd SI"' ,-ifi""lioT18 S"bj<"<" uo Cha nt«' Wilrnml-"'otic<' or ( lI>h,illlllon

ADVANCED ElECTRONICS APPlICATION5, INC.

P.O. 80. C216O, lynnwood, Wl 98036

TEl.P 1112.. I!:::AU fifT1. UW \J 1tt~""p'""" '/0 Gil

EAAEAEAEA

AEAEAEAEAEAEAEAEAEAEAEAEAEAEAEA

" When You Buy, Say 73" 73 for Radio Amateurs. FebruarY, 1986 59

• •

( ass R. l_ar,12 Ceotlt'dn DriveHolmdel NI 07733

Curious About Code?Learn (or improve) Morse from your TRS·80!

You 'll never find a more patient teacher.

Fig. 1.

60 73 for Radio Amateurs • February, 1986

t UU TO' AS$( TT(REtoAl)[R

the menus and prompts theuser. It al so sets the time re­lations between dots. dashes,and pauses between cha rac­ters and words The programsets the length of a dash asthree times the length of adot, space between words asseven dot lengths, etc. Theseand other time relation s canbe changed by modifyingprogram lines 350-390.

The assembly-languageportion o f t he p rog ramshown in Program listing 2accepts the ASCII va lueof acha racte r and translates itinto a Morse-<ode sequenceof dots and dashes by ac­c ess in g the cod e t ablesto red in memory by the Ba­sic section of the program(l ines 1140-1260). Two bytesdescribe each chara cter.The fi rst byte gives the num­ber of dots and dashes-e-n (ifn is larger than 8, then thecharacter will be ignored);the n bits of the second bytefrom the most to the leastsignificant bit correspond todots (Os) and dashes (1s). Forexample, the two bytes de-

5. listening to the codeof randomly-generated char­acters one by one and thentyping a guess (afte r eachguess the program indicateswhe ther the guess was cor­rect and if not, what itshould have been; aftergenerating 20 c ha rac tersthe computer gives you ascore of how many charac­ters were correctly guessedand what the average delayof your response was)

6. listening to the code ofa previously-stored sentence

Options" and 5 allow se­lection of a subset of char­acters (e .g., A, B, F, Z, and 7)from which the randomchoice is made by the pro­gram. Afte r listen in g to thera nd o m ly-ge ne ra t e d se­quence of ten 5-characterwords (menu option 4), youhave the choice of repeatingthe same sequence , display­ing the words on the moni­tor, or generating a newsequence.

The Basic program shownin Program listing 1 displays

~'''''''F '£~ ,SPE UE~

The program user is pre­sented With several se lf-ex­planatory menus. The prin­cipal menu gives a choiceof six options:

1 . Setting the code speed(defaults to 10 words perminute)

2_Setting the audio pitch(defaults to 1000 Hz)

3. Typing arbitrary char­acters and listening to thecorresponding code, whichis a lso displayed as dotsand dashes on the mon itorscreen

4. listening to a sequenceof ten randomly-generatedfive-character words

T'IS -80

ThiS interactive programwill teach or improve

Morse-code skills. The pro­gram, written in Basic andZ-80 assembly la nguage,puts out Morse code as a se­quence of audible dots anddashes via the computer'scassette port By attachinga small amplifier and speak­er or sim ply a pair of ear­phones to the cassette port(see Fig. 1), one can listen tothe code. The program wil lwork with eithe r Model l, It I,o r 4 Radio Shack TRS-BOcomputers and co u ld bemodified to work with othercomputers as well .

Program listing 1.

c,~ , cC WA~ T O~/O;'/&J

0~7F 1<

OfFI<O~OH

OflOOH I COtl( T"1<I.fOfOfOlt i SJ'AU l'A5></OOlOFOf:'H ;~ACC DEIW£EN . ORDSOfOf 4H ' loll : \-F.N"IHOFOf6H :I'A~I< Llll" THOFOF81< a .H AY AflH n .... IICTfROfOFAI< I f'! l I HI H Fa , hn"tOfOSOlt

GET.'f<e rcr r A:>l:1I V.... lII ff:r." r->~ IC,.,;e,NZ ,OU T!!'C.< H( HSt,SFACE sr-ur 001 Sf ACE~

ce,"I. . TA ~lE

I<l , err••<I<~) I l (jOl, UP CODE ' ''I<lE

••••,~

E ,( HU,C, 1'..5 1< I~,

,,~ ,

M~

11£ .< /<£~SS )' SF ACF AF'TH ","5'</ (101SP "'C£nA. 1'

•IIl . l 0 0HPC .<r<£ r<EIIG, 'PUI OUT f l-. Sf'1oI;£K•••cIlZ, S"ACl

... . , r«ltOO T ,M..... t4f "DS+< IC, 0 I

'"'..Z . OUI S! G

"b OlllU N..Z.oolU Il..Z , OUTl Oll00 '..~lIIITSICA. O:'( POIl T I.M(ASSfTTE OU TPUTc~Hl. , <MOlfl< I,.,~

ll£ l , f l<EllUEllC r [l(l "'Y~..,"IlZ, l OOP 2

11<flCK ' 0 WlSI C

0 0 10 0 ;14Ilf< SE COOE ~ Y

0 0 11 0 G£lA~~ EOU00 1:'0 P1lI<Y ((IU001]0 51'(" lOO00140 ''''Bl..( loo001~0 /<£ltS S £0000160 " f ltS l EOUOOllO " ( " (I{)T EDU0 0 180 "EH~SH (OU00190 "E "E N~ ( DU00100 rtf It, " Eau00:' 10 OIl'002:'0 _Sol P I00230 ( AH00:'40 LG00:50 ceOO~60 J ~

00270 UOO:'llO JI<00;090 OU T! f'US 1<00]00 I'OF'OO]I() Sl A00]20 LD003]() A~ I'

(0)40 l P003:>0 ll>~~ cr00370 f<EI00380 IIIC00]90 ll.00400 l OOf'l Sl A004 10 J~

004;>0 C"'l. t004.'10 J Il004 40 GASHI C"'lt00 4:;0 SI' '''CEl to00460 ceu,OOH O ereeo-eo LO00490 OIl~ ~

~IO lGOOS1O SJ'A([ PH~3() r.oOOS 40 O~

005:;0 ,J"00560 f<ET00!;7() ooT lGoo:;.so J il005'10 [iIlSI< LP00600 OUl tD00610 tOOF- ~ ~ I I

00620 C~

00630 J~

00640 t P00650 J f<_ ce006 70 J I<00680 CI'00610 J "00700 JR007 10 OUIC( II l D00120 J "00130 OUTt OW lD00740 DIlIS Ie 0Ul007!.O !HC00 760 r U5 U00 770 to007FJ!) l D007'10 POP00lI00 D£l OJNZ00810 ecc008:'0 LD0083 0 01<008 40 J R008"..0 ~~I

00860 £ND

cant bits do not matter in ified to other configura tionsthi s case and can be set to Os (casse tte , 16K RAM. etc.).o r 1s becau se Y c o nta in s For information aboutonly three dashes and one availability of derived pro­dot for a tota l of four svm- grams on d isk or casse tte forbois. The dots and dashes suc h co nf igu ra tio ns , andare " peeled" off by left shift- a lso fo r 6502-based com­ing t he seco nd byte a nd puters (e.g.• KIM 1), send anchecking the carry register SASE to the author. A ready­after each shift. to-run , sing le-dens ity di sk

The p rog ra m as li st e d with the machine-languagehere will run on the Radio program st o re d a s DATAShack Model I or Model III statements for Modell , 48K,computer (also Model 4 in is available from C & R Elec­Model III mode) with one tronics. PO Box 217. Holm­disk drive and 48K of RAM. del NJ 07733. for $10.95 ppd.The machi ne-language part (New Jersey residents addof the program should be as- 6% sa les tax .) You can con­se m b led and lo ad ed in to vert the disk to the TRS-80memory. where it will be ec- Model III or Model 4 dou­c e ase d by t he Basic pro- ble-densitv format by meansg ram . Both parts of the o f t he Radi o Shack CO N­program can easily be mod- VERT utility.•

73 l or Radio Amateurs • February, 1986 61

Program l isting 2.

- ,-

,-

5. 130• • I ;'SJ.I9l<. 6 4<. 20*4. 16,. .

,. .,. .601:'0S, :' 4

and BO (hex) = 1011 ooסס (bi­nary). The four least signifi-

6 .7;·.hO.9 . O. I. c,6,:'w<. 6 .13~ ,

s .I ~~, 5 . 56 .~ ol :3. S.l 9 ~, S ,22 46 . 1(.8 . 9 , O.I . O. :' . " • •10 O. <. J~ .

4,11:. 3 0160 .J,~: 4. 4. 96 .Io n 8. 3 . 3.: .< . 176 • • .tn .i, 0, 9 , 0_SE COl ,E IIY r; ~ l£ljA~T ·

9 . " .9. 0,I . O.S,~4B .

S . O.6,;>24 ,6. '3 ,3.12&.r , 0,;, .Ir.1.a, O.<0144 ,9 . 0 ,

TO l E A~:II

90 ~E" [O PY~IGH T <[> 19 0 3 [ ASS f<, LEWMT100 ~E" ~5r COl~ F'f<OC~A" UC~SION 11 / ~~ / a3

110 PI)t,E Ut 40~~,'''''0: F1lI'f IH40~ 1o IH4[

I<'OCl£"".IOOOl 30 tL S140 ~l" U( 1 00 ,. Ct I 00 > , f'< 1I 1 , ".<Ul. ~Ctu ,

I~ nIIlTU~5."_S£ CIl~£ HOCf<~" ~Y C.f<. L(WAF'I"I~O PRI Nl"Pf<OGf< M I NIIIAl IZ I NG , PlE"'~f w~ n , . '170 1' l lo'A~n.(FCHIJM "~orOPSTuvwxyr

1M 1'~lo' 1~~4"'78900: D3'~ 0 H ' . - d· >CHf< .( 34 l +CAA.< :>8 >190 fOl< 1_0 TD 1:'5:f"0tJ' ~ tl-3lI40.~:N(H IZOO "Rill:"." 'no fOR 101 10 ..4 : PCAn xC<I, .npOI'.£ ~'1-3n8,XCll>

120 ee.e . ' 1 - 3n 7 , """I ' · · ':If XC< I,-;; TIIfll .80no " XC< I I~40 f Of< J ol 10 Xly_:, . , IIF '.:'~6 !Hr.1l H t<II~ H" IH· . " IGO:O :'60;>"..(1 HI < I I_M< IH·-·:r_r_:'56~6O /lEU J~70 FRi llY"." '~ H£H I:1'90 Rr"'D GI300 "R 11+1 · • • ,310 l~ fUSf<I _UlF050

3~0 FI • • • .. ' · : f :'..· " ... "330 S_IO: F_IGOO3401'11I)OIIlH3.US/F- IO.S>J'5O 1'(1)00: 1'<:'",:'40>'$: XI'f'l:, >o7: f'<3l--I NHU/:'561J<!,O p( < '_XI_f'<3 )0<'56: 1', 9>_0]70 p( 10 I_p, ~ " 3: X3~3:'5/P( I I ,. P ( :' I : P( 6 Jo : IlY< X3/<'56 )sec P<S )oX 3-P(6 )':'56 ' X4_3U] 1 1'( 8 )_I H1( H / :' 56 >390 P(7)_X4_P(8)+:'~6

400 fOl< I_I TO 11: FOI-.[ 1'38~7,P< I>: IIFU I4 10 Hl IIIT4 ;>0 ",1111 ·10 CIOof\f+G£ lU.IIS11. 5of£H " '430 Hlllll USIIlG n "S l:I'I': !NT· OIf·.. ·I:PI':INl 1<11-1.<:361"- I·..0 PI': I II ' · 'Cl c......(;( I'ITCH" ,4 5 Cl f'I': III T USI ll e f2 . ; f f :f·fI NI· HZ· ; :f'f I KT l A ~( 36)··:'·

460 F'fI Nf'ENTE f CHAkACIEFcS FRON ~EHOAf; I. 3'47 0 F'f<IIIT·IlUTPUI fiVE CHAFA(;I[f( f:AI;J(U. _"s. .-490 PRIII '"OU1PUI SIIlGL£ CHAFcA(lEf[, 5 -490 HlIN '·1lU1FUT S1.... I""'r' Sl:CllA'WCE 6"!.OO INf-Ul f;lIf G I 01< , 6 ceresec~IO ON 10 GOlD 51O.~40 ,560.660 .660.o30

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104 0 P~I NT" I ' I Sf' cM Gil 1t~I1G~ ~.

10~O IfC 6 PP.I "Y"NE ~ St~utNC[ 3-10«1 f"III'·WEVIOUS (l{H'lJ E.HER . ,1070 100000l C:'T1f , :' I OIl C:' < THEil 10701080 011 ,: Cll TO 1090 .1I0(h870 .6001090 'OSU~ 1110 : CllI010301100 "''' " 1:fOf< I-I TO H: HINT CII~'!Cl ll);'hF.U I111 0 ~RJN Y : COl O 103 01l:'0 pO!' I_I nl ": O" USH <C< I H1130 N{Xl I: "~ TUf<N

1140 tlf.TA Q . O.1150 I",,'''' 9 . O·1160 I... TA 9, O.1 110 WlTA 5 .1 44 ,1180 DA1.. S , 8 .1 190 l'AIA 5 .:' <0 .1200 r"'l '" I. o ,1210 l""lA ',1 60 .1210 fi<;U 4 . 0 ,1:30 lOAl'" 2 . 19l .1:'40 WIT'" ~, M ,1 ~50 Ml~ 3, 96,Ino l'AIA 9, 0 ,1270 MT A ' F'l10G~"H

scr ibing the code for the le t­ter Y (- . - -) would be 04

SCOfI M. Hower K7KQ506 Sugar/and Run DriveSterling VA 221 70

W ARC, Rest, and PlayAdding 10-MHz capability to your Yaesu FT-101Z is a

simple step-by-step process. In just a few hours,you can join the fun on our newest amateur band.

The Yaesu FT·10lZJZD canbe modified to add cov­

e rage of the 3Q..-meter ba nd,a llowing operat ion in thenewly-authorized amateu rsegment as well as receptionof WWV at 10 .0 MHz. Fre­q uency coverage fo llowingthis modification ra ngesfrom 10,0 to 10.5 MHz.

When I started looking in­to modifying this rig, it ap­peared at first that adding30 meters would not be aneasy tas k. As most o f theband switch lu gs in th eJjY/w\w position a re notprovided in the transmitterPA section, it is not possib lesimply to convert W\W op-

e ration to 10 MHz and en­able the transmitter. Addi­t ionally, local oscillator andmixer components are no tprovided for the AUX posi­tion, a lthough a ll switch lugsare in place . Therefo re, acombination of W\W andAUX was used fo r this modi­fica tion.

The WWV section wasmod ified to receive 10.0 to10.5 MHz rather than 5.0 to5.5 MHz as is no rma lly thecase. Next, the bandswitchlugs for W\W and AUXwere jumpered to dupl icaterece ive operation in bothbandswitch positions. Final­Iy, the transmitte r section

was e nabled in the AUXsw itch position. The re sultwas re ceptio n of the fi rst500 kHz of the 1Q..-MHz bandin both WWV and AUXswitch positions. with trans­mit operat ion possible o nlyin the AUX position. Thistechnique prohibits the an.d itio n of any futu re ba nds,unfortunate ly, as al l switc hpositions are taken; howe v­e r, it was the on ly way toadd a new band to the FT­101 Z/ZD.

In the FT-101ZJZD, the5.o-to-5.5-MHz vfo signa l ismixed with a signa l gener­ated o n the premix loca lboard from a c rysta l oscilla-

tor. By replacing the crystalwith a 24.4875-MHz c rystal.the o utput of the mixer afte rmodifi c a t io n will ra n gefrom 18.9875 to 19.4875.This output signa l will thenbe passed th rough a band­pass filter on the premixboard to allow se lect io n ofthe d ifference freq uenc ieson ly. Following the hand­pass filter. this signa l is mixedwith the incoming rf to pro­duce an i-f freq uency of8.9875 MHz. This modifica­tion co nsists of changing thelocal oscillator frequency to24.4875 MHz by replacing acrystal and a capacitor In

the oscillator circu it.

Photo A. The FT-101Z.

62 73 for Radio Amateurs . February. 1986

Photo B. Underside o f rig showing the two new t"mmers in­stal/ed.

••••

- --- ,I,6_ ..0 t,

Fig. 5. S2D.

Fig. 4. S2A.

"

r - - - - - 'I AU' ;

;:;; '60"-, "'" .

ing directly to this unusedlug (Fig. 3).

6) 52A through 0 are lo­cated in the fi nal compart­ment. Sections A and Bareon opposite sides of theswitch wafer loca ted near­est the front. whi le sectionsC and D are on the last wa­fer. closest to the rea r. Adda 56Q.pF capacitor betweenthe AUX lug on 52A andground. (See Figs. 4 and 5.)

7) On tt , the plate PAcoil, connect a new tap 3turns from the 4Q.meter tap(towards the 20-meter tap).Connect this tap to the AUXlug of S2D with #18 wire orlarger. The connection to I Ican be made by carefu llypushing in the turns adja­cent to the desired tap pointa nd then soldering to tha tpoint; a much easier alterna­tive is to pa ralle l the 4Q.

,." ~.---- 1\' T~..,•

"" • C, :M),• , •

•

Fig. 2. SIC

" .• ••

Photo D. The new trimmer capacitor may be soldered direct­ly to the tr immer unit A circuit board.

•

lug 10 and the common sideof trimmer A unit. The trim­mer can be mounted by sol­dering its lug directly to theunde rside o f the ci rcuitboard (Photo 0).

4)On 51C, remove anyjumper that may be con­nected to lug 11 and tie lugs3 (40 meter) and 11 (AUX) to­gether (Fig. 2). The trimmer Bunit will have to be removedtemporarily to get at theswitch lugs. Simply removethe screws that hold the c ir­cuit board in place and ca re­fully move trimmer unit Bout of the way; there is noneed to d isconnect anywires.

5) O n 51D. remove anyjumper that may be con­nected to lug 11 . Then addan 8O-pF trimmer in pa rall elwith a 27o-pF silver mica be­tween lug 11 (AUX) and thecommon side of trimmerunit C. The common sidecan be traced to an unusedlug on 51 E. The trimmermay be mounted by solde r-

Fig. 3. Trimmer C unit. Fig. 6. A simple rf probe.73 for Radio Amateurs . February. 1986 63

. . "•

• I" I

III

S -------J

:'50 lAU>'1\ ..,

'-*'~'I 'C'20 3

premix board and replaceC27 with a l 00-pF silve rmica capacitor. Preset trans­formers T13 and T14 by firstbacking their slugs out allthe way in a counterclock­wise direction and then turn­ing them one tum in a clock­wise direction. Replace thepremix board.

3) Tum the rig over andremove the bottom cover.Carefu lly remove the shie ldscovering trimmer units Band C and the final amplifiercompartment. Note that thebandswitch runs from 51Ato 5lE a nd 52A to 52D. with51A closest to the front ofthe rig. O n section 51 B. fi rstremove any jumper thatmay be connected betweenlug 11 (AUX) and the wiperarm. and then remove thejumper between lug 3 (40meter) and lug 10 (WWV).NO'N add a jumper betweenlugs 10 and 11. Add an 8Q.-pFtrimmer in parallel with a300-pF silver mica between

Fig. 1. Trimmer A unit.

Photo C. The local board on the right and the premix boardon the left, near the front of the FT-101 Z.

Next. the bandpass fi lte rfrequency is shifted up toapproximately 19 MHz bychanging a capac ito r. Addi­tionally. trimmer capacitorsmust be added to the rf-in-­put section of the receiverand the driver section of thetransmitter; this is necessarvbecause the 4Q.meter trim­mer was simply borrowedfor WWV operation in thereceiver section before mod­ification. and no trimmerwas provided fo r the driversection. Fina lly, c ha ngesmust be made to the finalamplifie r stage to a llow theta nk c ircuit to resonate at10.0 to 10.5 MHz.

To modify the FT-1 01Z/ZD. proceed as follows:

1) Remove the top coverand locate the local board(PB-1965). Thi s board ismounted ve rtica lly on theright side near the front(Photo C). Remove the boardand replace Xl0 with thenew crvstel and C40 with a160-pF silve r mica capacitor.Jumper pins 12 and 13 of theedge connecto r. bei ngcareful to keep all soldera nd jumper wire away fromthe pins so as not to restrictplugging the boa rd backinto its socket. Replace thelocal board.

2)Locate t he pre mixboard (PB-1962), mountedvertically to the le ft of thelocal board . Remove the

,

Cty ""' - _l<>'- _""'''' - ---- - - - -

ments, the front pane l ageswitch shou ld be in the fastposi tion.

Mod if ication and align­ment of the rece ive sec tionis now complete, and 30­meter signal s should beheard w ith an antenna con-­nected to the rig.

AI ignment of the trans­mitter section cons ists onlyof ad justing the newly add­ed trimmer C (at 51D) topeak the d river output. Thisis done with the vfo set to10.125 MHz a nd the prese­lector peaked for maximumre ceive st re ngth of the ca li­brator signal. Witho ut ad­justing the prese lect contro lfurthe r, peak the new trim­mer C fo r maxim um drive byobse rving rf output o r PAcurrent Use as little drive aspossible, keeping PA currentbelow 100 mA, and re sonatethe plate and loading can-­trois as soon as output is ob­tainable. Be careful not toma intain a key-down condi­tion for long periods of time .Inc rease the drive leve l tofull output, recheck plateand load ing, and peak newtrim mer C a fina l time. Thiscompletes a lignment of thetransmitter sect io n.

No modi fi c at ion is re­q uired to make the digita lco unte r in the FT-l 01 ZDoperate co rrectly, as it sim­ply reads the new frequencyat the output of the band­pass f ilter and co nve rts thisto 10.0 MHz. Se nsit ivity andpower output a re co mpar­able to the othe r bands, andno problems were e ncoun-­tered during tune-up o r nor­mal operation. The prese­lect control shou ld peaksomewhe re in the l D-me terband area, wh ile the p lateand load ing co ntrols shouldbe near mid-range .•

Par1s List

X10-24.4875 MHz, HC·l8JU packageC40-160-pF silver micaC27 - l()().pF sliver micaTwo 8O-pF t rimmer capaci tors (Area 462 or equ ivalent)27G-pF, 500-volt silver mica300-pF sliver mica (270 pF In parallel w ith 36 pF may be used)560-pF silver mica, 500 volt

local board fo r maximumoutput at pin 1 on thatboard . Now tune the vfo to10.1 MHz a nd peak T1 3 andT14 o n the premix board formaximum output from thatboard; J301 may be used asan output port. This is a veryd iff icult ad justment to getat as the local board is locat­ed close and must re ma inplugged in. Use a sma llscrewd rive r and be patie nt !

Fo llowing adjustment ofT13 and T14, the output lev­el from the premix boardsho uld remain fairly con­stant th roughout the vfo'srange as this is a bandpassfilter. I found th is adj ust­ment to be not very critical,however, with merely peak­ing T1 3 and T14 be ing suff i-­cient. If the receiver's ca li-­brator marker signal can beheard at 10 .1 , the Smetermay be used to make thisadj ustment (the preselectcontrol should peak some­w h ere in t h e t o-me terrange).

O nce T1 3 and .T14 havebeen adjusted, you sho uldbe a ble to he ar the receiv­ers marker at 10 .1 MHz al­though the preselect controlprobably will have a broadpeak or two peaks. You needto tune the preselecto r tothat peak which incre ase sw he n you ad just newly­added trim mer A (co nnect­ed to 51 B). If the signa l goesdown when you adjust thenew trim me r, you have thepre select co ntrol tu ned tothe wrong pea k. Maximizethe signa l by adj usting thevto. the preselector. and thenew trimmer A. One distinctpeak should be o bse rvednow when adjusting the pre­select control. To observethe best peak on the Smetera nd to a id in fine adj ust-

LEi~ tfty ().I!IOI! us,lI:ld 52S) Ilff.... b POJOl;Jge lnl~~*",~_b~

wide band osci lloscope isnot ava ilable, an rf probecan easily be co nstructedfo r use with e ither a n in­expe ns ive scope o r high­impedance meter suc h asa VTVM o r FET voltme ter(Fig. 6).

To a lign the rig fo llowingmo dif ica ti o n , p lac e thebandswitch in the AUX posi-­tion and adj ust no o n the

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Yoo ' ~ find an your favoote issues of 73 for Radio Amateursin meores-ero in great corxirtlOll-WJth smart-looking bindersor file cases from Jesse Jones,

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meter tap, but this results inthe plate and loading con­t rols operati ng near the limitof thei r ranges.

This completes the modi­fication of the rig w ith theexception of alignment atthe new frequency. To peakthe va rious coils on the loca land prem ix boards, a me ansof sensing rl up to about 25MHz will be necessary. If a

Photo E. The new trimmer C, mounted on Sl E. The final am-­plifier compartment can be seen to the right.64 73 for Radio Amateurs • February, 1986

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••• 0 • • ** •• **

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n N or t n American ceuoooxIncl . shiPp ing within USA $25 .00met , shiPping t o foreign countries 27 ,60

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TtIe Clllbook Supplement i s a whole newIdea In C,all book u pda t es . Pu blished June I ,1 9 8 6, th is SUPPlement w ill Include all theactivi t y for both t h e N o rt h Amer ican an dIn terna tion al ceucccks lor the preceding6 months.

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AUTHORIZED KENWOODICOM RADIO DEALER

this ~icotionis available in

73 does not keep subscrip­t ion records on the premises,therefore calling us onlyadds ti me and doesn't solvethe problem,

'7!:> ~" Rudi ..I J\IIIUI_·.. r ..

don-.,'?

•

Please send a descriptionof the problem and yourmost recent address label to:

Subscription Dept.PO Boll. 931Fannlngdale, NY 11737

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tutor. line conditionerJanuary 1985

ICO~t mods. extra VIC-20 memorv.shoestring RTTY

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June 1985Special issue- RTf'!' , 9NI MM profile

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" When You Buy, Say 73" 73 for Radio Amateurs • February, 1986 65

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PaCComm also lias put fogelhe< pan,alkits IOf Ihe TNC·2OO wnich come w,'hha'd·to- find parts, a PC board. and an as­sembly manual. Gabi""IS and .ne1 plal esar. offered sep,a,alely,

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A .(().paoe calalog deacribi"g lhe lNWpreampli 'ie. lin. a"d otnee Hamtronicsproduc ts Is ava ilab le from Ham lrenics,Inc., 66-F Mo ul Road. Hilton NY laa68·9535.- (116}-392·fM30.

KallllO Electronics' Mini_II ;s a comp.aCIsu'1l'" suppressor lhal f8S.PQnds in 5 na­nos.conds, supp.esses 13.!lOO pulse·AmpS, and has a capac,ty ot 135 Jooles.Clamping Slarts at 150 vo lts, and lis filler·ing circuit femO....S 4 I dB o t noise al 10MHz In common mode aflod 49 dB 01 nolsein normal mode. Once p1uooe<l i" fOa ..a llCMlliet. lhe unused .eceptacle rece,...es tMsame crctectton as t ile lwo oullels on meMin i_II , gi.ing lhree prolecled sockets.

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-

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The LNW GaAsFET pteamp by Hamt,onlcs

Electronic Specialists has Inl'OOucedtho<! Mode miPowertS l. lic Pac. a protectiondevice !Of portable compUleB. The unitcomblnes • broado.n<l ac power IIIIIlf, apawer $pite $UpO'essor, a modem sp,ke

supp'essor and rt lilt.', and a sIalic dis·ch arge p late, Filte ' ed ac 15 aveuame I,ombolh a standa'd 3-O'ong oullet a nd . CEE­22 universal COfTIPtlle< powe< connector.Modem .ttachmenl IS IhrCMlgll moclularRJ_l1 ccnoectoee,

Fa , mo 'e in!orm. tion, conlac l El ec·tro" ic Specialists. Inc" j 7J South Ma;"St,"1. Naric~ MA 01760.- (~z>$.<f876

HAMTRONIC S~

GaAsFET PREAMPS

clude$ a balun transl~,.n ollset pipe,and all necesssfY mounling ha'dwa'e.

For sddilio na l inlormalion. contactGIO,,", £",e'p,ises. PO Box ~. B,auto..nNC 2B9tl2; 1800~I55.

T'io-Kenwood COfnmunical'ons has a ...nounceCIlhree""", 2m FM radio.. The TM­25 series oflers I choice of three powe,revers : 70 Watt s with t he TM·~70A, 45Wslls wilh Ihe TM_255OA. snd 25 weuewilh Ihe TM-2!l30A. The TM_2 570A In_

cludes a DuIU"n cooling Ian.All Ih,ee moclelS fellure a back-lit 16­

ke y DTMF pad, t wen ly·l hree memor ychannels whic h store Irequency, o Usel,• ne1 suo.udible eecese lone.•ne1 an auto­matic CI'IIe< wtltCIl "Of"" up 10 IIlleenseven·<hgil telept>Qoe numbers.

The TM·2!>-se rle s radios cover 142-149MHz a nd . fa mocliliable 10 cover 141_15 1MHL A.ailable OPlions Include a 3$-loneCTess encodel', a Dig,'al Channel Linkmodem. a voic. syntll.sizer, and. call­Sign (liSp l. y.

Complele intorm a llon is a...ail a ble !romTrlo-Ken ..OOd C<>mmunlcation" PO Box1tll55. Compto" CA 90224; (213}-639-9000

FREE TOOL CATALOGFROM CONTACT EAST

GROVE SCANNER BEAMG,o...e Enlerprises has IntrOOuce<! a new

anten"a lor sc.nner .nlhusisSIS, TheSca"ner Beam cover-s 30-960 MHz atld I~

Conlact Easl is olle<ing a tree cat.1og01 OVer !l.OOO Ilard·lo-lind proouct s tOf as·sembling, Installing, a nd repai,lng elec­Ironic equipment. The cataiog featu'esprecision hand lOOIs. tool kllS, lest j"stfU­menls. SQldering $Uppl~. a nel sti-llc-(;Qn­trol devICes.

To request your I ' .... catalog. wril" Ofceu C<>n/ac t f ast. PO Bo~ 788, NOr/II A,,­dover MA OltU5.-/800}225-5370

KENWOOD TM·2570A,TM·2550A, AND TM·2530A

Tile Sca""e, Beam trom Gro. .. f M e, ­prlses.

include an e _ternal spea _e<lmlcrOPhonewilh .n .nt""fIIl jack, a Pfogrammablescanner. and 6CIO-mAh Of l()()(knAh nic kel­c.dmium batlery packa,

Fe.- com plete deta ilS, contac l Midland

LIrAR, lrAa rlre ling Depart"'e,,/. 1690 N Top­piflfl. Kansas City MO 64120.

A new 16<:hannel proo,ammat>le h .,.quency·synU,eslzed porteble two-wa y FM,adio hal been in tr od uc ed by M.d la nCllanel Mobile RadIO, The 'adiO lealur"" aIront-panel keypaCl anel a Ilquid-(;ryalal ClII­play. VHF models cover 136-174 MHz. andUHF mcoete cove' 406-520 MHZ; bOlhVHF and UHF models ha"" • swilchableCMltPtlt 01 5 Wall••neI1 Wall.

Tone-¢oded squelch is • SlanelarCl !.._lu'e, .nd each ch.nnel may be seplralelyprog,.mmed tor any EIA tone. A DT MF op­lion 's alSO I.ailable which temporarilySlores data entered trom lhe keypad anelautomatlc.lly l,ansm,t. il when the Ptls/'l­to-talk SW'lch Is .cti....ted. Other opllon.

HEATHKIT HD·1422ANTENNA NOISE BRIDGE

Heath', new H[).1422 Anlen". Noi..eodge il an antenna luning aid wll ic tlhelps reveal the Cause 01 any mismatch

l>elw8ef1 I slation"sl,ansmi!t'" and i'.a"·lenna. A tone-modulaled btoadt>atM:l noIMsill ....1 i$ generated in the HD-1422 1Mcoupled to an impedance bridg", Usingtile feee ;"". as an Indicator, t he imped·aoce bridge is uMod to measu•., the reac·Ii... components of Ille ani en nil ".impedance. This allows "eell anle",.. tobe l,immfld to a 'avorite ope'.lIng I,e·quel'lCy. Additionally. the HO·1422 can beused to presel an antenna lune., 10 tune .Quartet·wave t,ansminion line. ilnd 10measure the value 01 un~l'lOWn capacitorsand inductors.

For more information about the HO­1422. gel H&athlcil's new catalog by wri,·ing Hut,., ComfM"Y. o.pr. 150-51n. Beon­ton Harbol 1.11 49022. In Canada, writ.Heat,., Comp.ony, 1020 Isling!on AvenIH'.Dept. 3100, Toronlo, Om8'io M8l 3

MIDLAND LMR16·CHANNEL HT

Midl. nd U AR 's lfH;fIIlt1nel FIrA po,table ,a·dio

66 73 for Radio Amateurs . February, 1986

---••••

, .- -.• 0

r~ MinI-II .u~ . uppreu or from KalQloElttcfronic•.

~"" i'IS, 1fH; .• 426 WeSI Taft A ......... Or­tinge CA 92l56S-429l5; (BOO}-854-D54 7.

l ronk;,s (;<)mpany, Inc. , 658<f RlKh Road,s..,hleh/lm PA 1801 7·9359; (2 151"83U)1()()

Tile OI-t 6 Dat ~ Inte"Oll'ItOl from Com­munlC.'IOnS Specialists IS CleSig...cl forremote ret._al 0 1 accumula ted l ime and1'..1 information t.om the TP-3ll Sha'ed Re-­peater Tone Panel. It a lso ma.y be used to.emotely KCess tile TP-3Il to enable 01

d,sabl" repeate. subs<;. ioo.s. H~'d-eopy

pnntcut is available wi th a Radio Shac ~

TP·tO se. ial pnnter. or the 01·16 may be

connec ted to a host compu te, 1m inlor­mallon processing and ai. -tima billing.

The 01·16 uses a sixleen-digit ~eyboardand has a tl ig t-..vis ibilily LED display. Anautoma tic m ~eying ci.cui t aflCl an out­PU1 POf1 101 ser ial communicalions arestanda,d equi~t ,

For c)eU,iled intOlfTlalion about .n. 01·16lnt""09.to<. contac l CommunicaUons

01·16 REMOTEDATA INTERROGATOR

UN!John Edwards Kf2UPO Box 73Middle Village NY 11379

HOW HAMSVIEW THEMSELVES

Si. y....-s of " Fun ' " poll•. That 'a along"relcn of lime, 10 say t!'le IN$t,

I.-w"tl U... <Jay I put togell'_tM IIf.t pOll. I nad just finished putting anew COil in my sparl< Iransmitter _ myI. iend HorKe pulled up ttle driveway in tlis1912 Model T,

" Hi, Jonn!" said Horace, as he loldeddown the rumble seat " How's the mobileantenna project coming along? '

" NOI bad," 1 replied . " Bu t you wouldn 'lbeueve how many windings half8 to goin to a JOO.mete. ioading coil. , .•eal be.. towind"

" TnInk inl wort<?.. he .s~ed.

" In tl\eofy if should. BUI whefleo¥er I et­tacl'ltn. antenna to my locomobile's 'earbu_, it hlts I"" car'. I.ont ""'-Is oiltile go-OUnd,MI grumbled

" Tougn tuck. OM ,~ said HorKe. as roe

played with my new mobile .ig's coupler.Okay, okay, I'm exaggerating, but it h.s

been a long time.Thil yea., al in Pfevious " Fun!" polll,

-.o.'.e .e tai ning many old qU.llions tot,ac~ dev<eloping lrends in OU' hobby andiKlding some new ones 10 ~eep up w ith tn.times. Wl'\al_ ~_s, """" 'fOUr ..spon_ 10 PO Box 13, Middle Village NY

1137'9, Or, i l 'fOU 've given up on tn. USMule, you can "ansmil you. ans~ elec·I.onically, My Compu5efve 10 i. 70007,&12(CIS! or 76CllM.174 (ElS), My Sou.ce 10, IIyou p'efe. that I ys tem. is CPlI.I17. Youmay also con tact ml! via MCI Mail ; justl ype my name al the " To,,, prompt

ELEMENT 1BACKGROUND

1) Sex;Al Mal"BI Female

2) "OIl'A)15 or~

B) 1&.21C) 22 -39

01<0-59El60 years and up

3) License ( l.ss:A) NoviceB} Tech nIcianC) GeneralD) Adv ancedE) Exi ra

&1Numbe. 01 years lic. nsed :A ) 1 year or lessB) 1- 5 Y"arsC1&,10years0) 11_20 yearsEl21 years and UP

51 Do you 1'Ia.... a ....... (po:sl ,March 78) call ?A) YesB) No

61 How many l'IOurs a week do 'fOU devoleto amateu, 'adlo?

A) 0-1 l'IOu.B12- 5 hou.sCI 6---10 rlou rsO} 11~20 hours

E) 21 hours or more

7} Which HF band do you use most?A) 80175 mel ersB) all melersCI 20 mel ersOJ 15 and/or 10 mete'sEj Don't operate HF

8) Which VHF/lJHF band do 'fOU use most?,o\)6.....lersBI2melersC1220 MHz

OJ &20 MHz and/or upEl Don'I ope,ate VHF/lJHF

91 Whicn mode do you use most?") SSBB)CWC) FMD) RITVE) Other

10) How much money tlave you spent onamaleu••adio wit hin Ihe pasl year'? (In.clude OSL expenses. magazine subsc.ip­liOnS, club dues, and Ol ne. i nc iden.alexpenses..1

AI""'"51 $251-$500C1 $5Ql - S1.000O)Sl,OOl-$2,~

El $2.501 and up

ELEMENT 2SOCIAL CHARACTERISTICS

11) On the whole hams a'8:AI too youn gB) too ol dC) Just the .ighl age

12) Do you li ~e .oc~ mUlic?A ) veeB) No

13) Po!ilica.lly, hQW would you define yotJ,­

",nA ) Con......-vali""B) MiddllHlI ·11le-roadCI Libefal

RESPONSE FORMInst,uctlons: Read each quest ion and marl< your ,esPO<>M by ei<cling Ihe appropriate leuer next to the numbe< ollne questiOn.

f leme", I; Eltlm/l",2' '" A a '" A ,'" A a

n A e '" A , C '. A a '" A e '. A a

• A a C 0 , '. A e 23, A e '. A , ' 3) A e3) A e C 0 e ta A e C N, A , '3) A e C 0 e '" A e

" A e C 0 s '.. A e 3<, A e C 0 e ." A a C 0 ," A e ts A a C 0 , Elemenl3: 35, A e '" A a C 0 a

" A e C 0 e '. A a '" A e 36, A e 'n A a C 0 an A e C 0 , 'n A a "" A , 'n A e ... A e C 0 a

" A , C 0 ,'" A , C 0 ,

'" A e '" A a '. A a• A , C 0 , '. A e '" A a 39) A e C 0 e '" A ,'. A e C 0 e '" A e '" A a .. A a

Comrne<.ts: _

73 for Radio Amateurs • February, 1986 67

•

ATELLITES

USING THE AO-10 APOGEE PREDICTIONSAI>O'Ilee predictions fo r the month 0 1 Februa'Y arll prO\llded for three secnooe 0 1 tne

United States: Wash ing ton DC at 39N 77W, Kansa s at 39N 95W, and Cali lornia at 36N122W. T,mlls arll in UTe and apogell in thia case Is me..n .. nomaly 128 rounded 10 Ihllneereet whole hour, Use the cherI as e gulde In aIming your anlenna, then IIne·t une theazimuth and elevation values 10 peak the S8telllle's beacon slgnal, I! you requlee mereaccurate orbit al pred lcll ons. cc ntect AMSAT at PO 80. 27. Wash ington DC 20044_

AMSAT-OSC AR 10 APOGEE PREDICTI ONSFe b r ua r y 19 8 6

WASH KA NSA S CALIFORB I T DAY TI ME AZ EL AZ EL AZ EL------_........_-_._-----------------=------=---2313 1 0 200 217 723 15 2 0 100 20 8 1223 17 3 0 100 224 1 202 1423 19 4 0000 216 7 192 172321 4 2300 222 3 207 11 18 2 182323 5 2300 217 6 20 1 13 175 172325 6 2200 208 11 19 1 16 16 5 162327 7 2 100 198 14 181 17 155 132329 8 2000 188 17 170 16 14 5 9233 1 9 2000 181 16 164 15 140 52333 10 19 00 171 16 154 12 132 02335 11 1900 165 15 148 92337 12 1800 155 12 140 42339 13 1700 145 82341 14 1700 140 42343 15 1600 133 02348 18 0200 229 02350 19 0 100 221 52352 20 0 100 216 8235 4 21 0000 207 122356 21 2300 197 162358 22 2300 215 7 190 172360 23 2200 220 4 206 12 180 172362 24 2100 212 9 196 15 169 172364 25 2100 206 11 189 16 163 152366 26 2000 196 14 179 16 153 122368 27 19 0 0 186 16 168 15 144 82370 28 19 00 180 16 16 2 14 139 4

68 73 for Radio Amateurs a F ebruary, 1986

I'm looir.ing for copies 0 1 lhese milllll'Ymanuals: NAVSHIPS 0967· 173-7010 vet­uene 1, NAVSHIPS 92 175, NAVSH lpS93210. and Mtl ·R.12887.

Cha~ T. Huth WBaNUIm~_sl_

TIffin OH 44M3

I'm looI<ing lor a se""",",,11f; l Ol a 1.(; lSI""gl.slol COin III"'pllo"e_ I will pay a rN$OR­able pr ice for I I>e or>g'~1 or • cop,

Mel W. rclHn I<60XE11113 FlahIII D<tft

Vinlie CA 932'll1

HU anyone had ..ny expeoenca Wl11'l a

program cal led " MOI'SI! Code in CoIot" "omIf>II December, 1962, lssueol80 Mlf;ro'

Naln.n t..kf>ty94llKnapp

G,and Ra plcla 1011 4i505

S) Pasc..1q Assembler

Ol MachineEl Other

4Q) Do you feel yoursell competenl towri l l! a short Basic prog'am?

Al VesB) No

41) 00 you fool you'self compe tenl to r.place the finals in a Iransislor-type rig?

Al YesBI No

42) Do you SOlder tOll"l he. YOU' OWn co.uconneclors?

Al Ves.,..431 00 you own • TYRO (home un" sal­ellite) s~tem?

Al VesB) No

4.4) Do you operate a packeHadlO system?A) Yes51No

4SJ Wh.t do you think 0 1 cont"t,ng?

A) Greal.,""""o OI<.yDl Dorff li ke ilE) Despise il

46l Whal do you think 0 1 a x,ng?

Al Gre<!1.,""""o OllayDl Oon'l like i lE) Despise il

47) WIl.. t do you think 01 repeaters?

A) GtII..1.,""""q Ot<. y0 1Don'1 li ke themE) Despise Ihem

48) Whal do you think o f trafhc handl,ng?

Al Greal.,""""Q OkeyOJDon't l ike i tE) Despise it

49) II you />.IIa,d an effill'gllJ>Cy nllt ;n prog.ress. wou ld you immedl..tely join In andollllr your services?

Al YesB) No

50) Have you liver sec reli y hoped lor a mi·

nOr d isaster to stri ke you' community lu stso you cou ld oemo ns trate your radi osk ills?

A) YesB) No

AM HELP

I 'm Iook;ng l or a nonworking AlOco Ma­

line VHF synthesized ' edio ",ill' a ache­m.Ul; c r all rvlCII m.nual• • nd a Halll ·cra lllll'S 2m un.t.

Jim Pen_ WB5.uGZ2$ Sct>HIIIII La...F...nokl NJ 07728

Ga", Beman:!1000""""-rt

M.mt1laland Fl 32lIS3

I nee<I a ....n""'l for . VHF Engi.-ringSynthesi.Zer II

I need e sl.liOn monitor Ih..t;s compelt·ible wllh the He.a t" HW-101. Hllal h mi>deone. bu l I u n' l 'emember liS nomencl..tu,e , I will pay UPS Cfla,r,," 10 H.wai!.

F..cl Smaltwoocl WAtJVlCOMTHtROFU

PHrt Harbor HIIl6IIO

responslblilly 10 ' ham operal ion 10 l heamateu, comm unrty?

Al VesB) No

29) Whal dO you Ihlnk of people who viewp..y·telev;8Ion services wil h "IDS converl ­

illS and satellite dishes that a'lI not . ...proved by brc.dc. sl ll's?

A) They',,, Skunks.Bl They' t11 w,th ln Ihe" "gn ts.

301 Should WII get rid 0 1, or reecee in size.

the CW subbands?Al YesBl No

31) 00 you think OX nets h."" ill ploace in".m,~io?

A)Ves8 ) No

32) 00 you think nelS in general have aplace in hem ,adlO?

AlVes.,..33) The IIIId l ime . " am QpIIfa lea 110mapace, whocl'l ba J'lO anou kl heo'aIle use?

A} 2 meters

B) 220 "'H~

Cl4-50 M HZDl An _ "'liner beII<lEl Shouldn't OOtl>lll lO opIIfatll

34) II, Mlile tuning Kroes. Dand , you

h ea,d e nel called " Jammere In l erna­tional" in prog'ess. would you:

A) Jam itB) Ignore ilo Compla;n to lhe FCC ~ some o t"""

OIpnlZlltiOn

DlU.tenEl JOin 'I

35) If ' lIQu,fII(l , could you SOlid ly copy CWa t the speed . t which you were licensed?

A) Yes8 ) NO

36) tI req ui'ed. could you p.ss the FCCtheory l esl for yOll' l icense t ins?

A) V"B) No

3n Have you ever purposely ope,ated inen amateur subband you weren't IIcllnsed

10 use?Al YesBl No

36) A,e you t1 uant In any com pute' Ian.guege?

A) YesB) No

39) It you an swered " yas" to quest ion 36,which languagll?

A) Basic

ELEMENT 3OPERATING HABITS

25) II l he useB w....e resl ricled 10 da tacommunicatiOn only (no ptlone or CW op­.....t iOnj. would you be in f.._ of • no­code 22().MHz Oigl t. I-<: Ias.s license?

Al VesB) No

261 Would you bII in f;noo<ola no-code 22().

MHz Oigital-c~ss tickllt if i l pe<milllldptlone QpIIfation;n add,liOn to <Sal . Ir.n..mission?

~ '"8 ) No

27) H. ve you """" used .. plI<:lC,>nal <;om­

pu ler in COI'IR8CIIOII wi th your amateu'.....dio activit,es?

Al Yes

BI No281 ts it lime to completely delegul.tll am·al eur ,adlo by h.ving l he FCC l um O\Ier .11

22) Should ham licenses have a minimumallll ,equirement?

A) YesB) No

231 Should ham licenses havlI a max imumaile requlrement1

Al Yes81No

24) Should hams be subject 10 periodic r.t. s t,ng?

A) V"8 ) No

14) Shou ld WII gill rid 0 1 !nil AAAL?A) VIISB) No

15) How ol d we,e you when you I lrst be­camll a ham?

A) \5 or billow

B11&-21022-39

OJ'''''E) 60 or .Dove

16) Should the FCC Inc re.se the speedson amateu' CW e• • minal lons?

Al YllsBl No

17) 00 you own. home compu ter?Al YesBI No

t8) II you .nsw....1Id "'t'II'S" 10 qUftSl iOn 11 ,

wh ich bI.nd?

~ .-8) IBMo RadIO Shack

OJ_'~ "'-

191 00 you think tn.t home computing ;ss,phonong people (inc:ttKJ,ng youngsl__1aw .y Irom amaleur 'adlO?

Al YesB) No

201 Arll hams gelung dumt>er1

Al Yes

BI No21100 buslt>l!'SS lnt....ests deHr.e some 01

our vlrtu. lly . bandoned bands?Al YesB) No

ARTER'N'BUYInd ividua l(noncomme<cla l) . . .. ... .... . ..... • . . . . •.. • .... •... 25c per ....ordCOil."..cl"r 6Ot per word

Prepayment by check Of money otdet ia qui,1Id ith)'OUr ad. Nodi$COUn, . Of

commission. are .v.llable. Please make your payment to 73. Rates 101' mult ipleInsertion. a'•••allable on request.

Ad'¥er1 ising mus. perta in to a,Tlllteur ,adlo e>roduels Of seroices. No speciallayouts or poei lionll . ' e possible, All adwlfl iSing copy mus' be aL>bml l1edlypewriU.,., (double-spaced) and must Include l ull name and aooress. Copylimited to 100 words, m.~lmum. ColOn' only words in l ex\. Address , l fflfl.

13 e.nnot ...,.; fy adYelt ising clalma and cannot be held responsible lor c l.l....m.de by the a<herl IMf . Liability will be li mited 10 making any oecesaary eeeeee­t lons In the next available Issue.

Copy must be received In Pela,borough by the 5lfl or the second monthpreceding the covet data.

Malo" CheckS payable to 73 Magazine and send to: Jim Gray. Ad'ver1 lsing 0..­~r1menl. 73 Magazll1e . 8CI Pi... 51. , Peterborougtl NH 03458.

KENWOOD 430S OWNERS! Stop 430Sscanner on busy l requencies. When clear,'esume automalically' Squelcn-actlvale<.!!Ae'<lewed O5T&85. 13 2185. warldredio 12/84. $ i9.95: $29.95 assembled. $2,50 ship­ping. JABCO Slop Scan, Al Box 386. A~

eXandria IN 4$XJ l . BNB396

SSB SQUElCH 'or any radio! Imp'ovedci rcuitry ! Act ive fiU~ ! 2~ • >< 5 Yo •. $54.95piUS $2.50 shipping. JABCO Squelch-It. R1Box 386, Alexandria IN 46001. BNB397

SOLAR·ElECTRIC MODULES. Dea'e,price lisl. $1.00. Homestead Dislrlbuling,PO Bo...51, NOI1 I'lPOfl WA 99t5T: (509).732-3142. BNB398

SURPLUS AND MOR E SURPLUS. Thou­sands 0 1 items. tree bargain·packed lIyers.£TCO Electronics. P1allsbulgtl NY 12901.BN"'"

Radio Syllem•. PO Box 0.1, 9<13 Boblftlt .Bla ine WA 96230. BN8407

HAM TRADER YELLOW SHEETS, In our241h year. Buy, swap, sell ham-radio oear.Publ ished ho' ice a month. Ads quick ly en­cu late-no long wait lor ,esults. SASE forsample copy. $10,00 'or one y....r (.24 I$­suesl. PO Box 2057, Glen EUyn IL 6013lj.­2057. BNB412

WANTED: ICOM IC·SP2 speakef, ANIURA·17.... supporl brackelS, and plug .... ta. C. T.HUl h. 229 MelmDIe St. , Tillin OH 44883.BNB413

ANTENNA_ I New Hy-Gain TH50XX s­elemell\ beam In l actory box. $275. 1 Wil·son 1.1204 4-elemenl 2O-meler beam, Used.$150. MOIl8Y oroer only. loyd H. RictlftyWB4S MO, Rl , 7. Box 146·A . BOal AL35957; (205~593-5546. BNB4 t 4

MOBILE IGNITlON SHIELDING. F..... Ill ·erature . Estes Engineer ing, 930 Mar ineD,lve , Pon Angeles WA 96362. BNBOO6

MIUTARY TECHNICAL MANUALS lor oldand obSOltlttl equ ipment oo.page catalog.$3.00. Mili tary Tectlnical Manua l Stlrvlctl.2268 $en.a$8oC Ave.. long Beach CA 90815.

ON"""HAM RA OIO REPAIR, tube ttlroug tl solid' late. Robert Hall Electronics. PO Bo~

8363. San Francisco CA 9<l t2ll; (otOB)-729­8200. BNB219

IM RA. _lnlemallonal M iss ion Rad io Asso­ci. l ion. Forty countries.llOO members. As­sists mlsslollarl..s with equlpmellt loaned,...eekday ...t. 14.280 M Hz. 2:00-3:00 pmEaslerll. Brothe' 8&,n.. rd F,..y. 1 Prye,M , no . Road . l archm ont N Y 10538.BN8326

ElECTRON TUBES: ,eceiv ing. lransmlt­l ing. m icfO'Mave all types .....ilable. largeinven lory m ealls Ilext·day stllpment Inmost cases. Dally Electron ics. PO Box5029. Complon CA \10224; (213).n4.1255.BN...,

XEROX MEIolORYWRITER_ pal1s, assem·blies, boIIrds, manual t. Free help with see­¥ice problems. W6NTH, Box 250, 8ftntonAR 72015: (50 1~nlHl92O. BN8404

DOCKINQ BOOSTERS, l he most 'anl asticHT accessory, only $129,95! Digllal-dls-­pl ay Swl melers and barilraph poweroOu l ·put Indicators, only $8 " .95! HI -M oulldkeying mecnanl_ , ma.1 ext&nsive line01 stra igh t keys, paddles. and mobilekeys! Wllte lor free catalog ue o f special.ized communications pIOdllCtS. Skywave

BE OUR VALENTINE! Yo ur un wan tedequ lpmenl 'NOUkl be g.eally apprec laledby the c..plds leamlng Eng lish lhroughamateu, ladio at JUllior High School 22 onManha ltan 's Lowel Easl Side, Sellll i l to­day via W82JKJ afld 'emember. Not on lyare we lovable, ...e·re also deductillblftBNB415

FOR SALE: HiCkock Osclltog rap/l , modelS05A. good condit ion. $100. Jofm N5HH l,505 Wesl Broadway. Kingfishe, 01'; 73750;(404)-3T5-6473, BNB416

QSlS 10 orde1". Variety 01 . tyles. colors,card alock. W4BPO QSls, PO Dra...ef Ox,Cordova SC 29039, BNB260

rHE arEAS MAGAZINE. Up-to-date, In.lormat ive. Inlefeating, Compiled and eo­It tld by Gus Bro...nlng W ..BPD, OXCCHonor Roll Cel1lticate 2..... Send for /rf#etample and sub8eriptiOn in form. l iOn 10­day. PO Dra...er OX, Cofdo.a SC 29039.BNB261

FIND OUT -..hat el se you can hea, on yourg_r.I<OVe,age transceive< or receive<.Join. short ...ave radio Iislenlllg club.COm ple l e Inlo, m . Uon o n major Nor thAmertcall clubs afld sample ......sIeUef.$1.00, Associat ion of NOI1h A..-;call Ra­dio ClUbS. 1500 BUllbury Drlve, Wtl lttier CA90601. BN8310

INDIVIOUAL PHOTOFACT FOLDERS: u to.1400, $3.00 postpaid, AJL. 414 CheSlnu tLa.... East Meado... NY 115504, BN8312

RAOIO TRANSCRIPTION DISCS WANT·ED. Any .Ize. speed. W1FIZ, Bo. 724 ­WO. Redmond WA 98073-0724. BN8347

CABL E CO NVERTERS. Lo wn l price.ONIef Inquiries acceoled. Quantily dis­counts. F..... calalog, P.G. vreee Corp.• 61Gatctlell 5 1., Otlpt 73, Bulla lo NY 1421 2.BNB349

TR·7 USERS-N6-7 noise blanker, new,S65 ppd. st.-soo CW fillel, new, $SO pDd.H5-75 headset by Drake. new. $14 p(ld.

Tony lol uu ro I';3Ul';W. (2 15)· 271·8898.BNBJBO

CABLE TV CO NVERTERS . nd equlpmeflt .Plans and ~ns. Build or buy. F'ee Inlor·mal ion. C & 0 Electronica, PO Box 1402,Dept. 73, Hope AR 71801. BNB383

QSl CARDS: 100 lor $5.00, 5OO 'or $18.00.For . sample. send an SASE to K&n HandWB2EUF, PO Box 708. East Ham pton NY11937. BNB388

IromplIge4

the t 4th 01 November. afld the Fredericksbu,g " A" ind.u jumped to a dlSturDod+evel 01 22 on me 131tl. f'ertlaps not coincidentally, there was a solar ec lipse onthe t2th and a solar·f1ux peak on lhe 15th. 01 COUrse there Is no claim that thealigllments caused lhe vok:anism. but you do see some in lefesting evenlS. TheMe.icen fIIIl1hquake 0'Stlpl ftfTlber followed by one dillY a jump In lhe FrederiCks­burg " A" Inde. 10 28, and was stlOl1ty 'ollowed by a 9<klftgree al ignmenl o f U,a·

nus a fld Mel cury . .afld. by tne way. it was on ly ltlr8e da ys alter that Hu" icaneGloria beQltn liS 'am~oe to"*ilIrd ccetact with New Eng la fld .

One stIoukl bear In mind Ihat I d id nol prediCl any 01 lhese natural diU SlefS,but A. the days between the 20th ilIlld 27th 01 Stlplember. I predicted propagill'l lo lls 01 Fair or f'QOf 'or si. 01 Itle seV(ln days. In November. on the fOUl daysbet ...een l he 121h and t5th, I prediCted Fair for two days and Poor 'or two days.wh ich jusl happened 10 coincide ...lth aclual band Condltiolls.

I th ink Ihal cncumeta ncee point to tne need lor a closer look at these relallon.Ships and. concel1ed effort 10 allempllo latlanallze them for purposes 01com­municetlons e'''c iflncy and-hopefully one day In l heluture-Ior helping savelive$ a fld property.

DIRECTION FINDING?

New Technology {patent pending) converts any VHF or UHF FM receiver mto anadvanced Doppler shill radio direction finder , Simply plug into receiver's antennaand external speaker jacks. Uses four omnidirectional antennas. l ow noise, highsensitivi ty for weak signal detection. Call or write for full details and prices.

rl DOPPLER S YSTEMS. INC. 5540 E. Charter Oak, (602) 998.1151t-' Scottsdale. AZ 85254

- _ _ .~~! ~~> 'y' ~=:=:::O~. -PR E TUNEO· A S SE lBl EO· fO R All "'A"'ES A"' ·ONl¥ ONE N EA T S A l l J ATE U R T RANS CEIV ER S .

N TENNA f OR All B A· GU AR A NTEEO fOR 2 000NOS ' EXCELlENT fOR WAT TS s se INPUT fOR,", P AR TM EN T S ' , ,,,, . NQIftC( ANO A L L CLAS SPR OVEO OESIGN ' A"'AT(UR Y

CO M PlETE .. ft~ 90 " RG 5 e U · 5 2 o~'" r••d 'n.Pl2 59 <Oftn. et "'~" ' '''' ', 30" 300"" , . " on on._ U n n• • ' on _ In • • Mn , ........,.. ....-.e. L.e... S WR _.·T~_ NOT"'l:ED£O' C..... ..... .. _ V. · -.... -.. otU<s. __ 1_ .. __ _ h. ~U ANTENNA VOO W IL LEVER NU P fOR ALL IBANOS' NO B ALUN5 NEED£01

8 0 ."0.:0'0. 15.'0.·:0' " ... 104 fl . ·"0••' 9911 0 .. ,· ,"79 .9 50 0 . 2 0 . ' $ . >0 _ :0' _· 5 . ft , 1OOl0 . "7e 9 ~

:0'0 . ' 5.1 0 ... , .. _ 2 • :0'6".· , 1007 0 "779~

SEND r ULL PRICt f OR POSTPAID INSU RE D. D£L IN USA(C ,"S.OO . <1" '" _ ,_ "" ne) O'

..... u'''o VISA • M A S TE R C ARD· AMER. EXPRESSGin ...._ .... u . ... . . "" 1·308.:0'36 · 5333 9il "" . 6P""..... . .... W . _"' 2.3da• • . All PRICES "AY INCREASESAVE · ORD£R >tOW' .oO I .. 1 . ....IO _ _ ~ _ M_ ..USil fREE INf O. ilVilllABL[ ONlV fRO""

W ESTERN ELECTRONlo;;SO.pt . • T n • • , N 6116 "7

* Interference l ocation

* Stuck Microphones

* Cable TV l eaks

* Security Monitoring

/~-----

p ............" ...22 5 •- •- - • •

-~-- -• --

* VHF and UHF Coverage

* Computer Interface

* Speech Synthesizer

* 12 VDC Operation

" When You Buy. Say 73" 73 for Radio Amateurs • February, 1986 69

-lei l i . Admission Is SUlO. Tables are S7.50in ..,....nce.nd $10.00 at thot dOor. Selle<selup begIns al 8:30 ..... T..lk';n on .01/.81and .52. For ",se~allons 01 more informa·

tlon. contact the AARC, PO Bo. 256. Marl·boro lol A 01752; (617)-393.9920.

SPOONER WI

fEB 16

Thot Wild Rivers ARC will hOld Its milf.wlnte< swaplesl on $I.Inclay, February 16.1986, from 10:00 am to 3:00 pm, ..I theSpooner e. p er lmenlll Fa'm. nst o fSpooner WI on High"'.y 70. b ..ms ",i ll begiven. T.b les a", .. "all.ble, Ta l k·i n on147.811.21 . For more inlormltlon, con tactTom Young K09FC, Route 5. Box 5239,Hay.... rd WI 54843.

MAN SFIELD OHFEll 11

The Manalield Midwinter H.mfeatlAuc·tiorl ...il l be held on Sunclay, February 18.

1986,~inn'ng al 7:00 am. et the Rich·l..nd County Fallgrounds. M..nsheld OH,AdmiSsion II $3,00 In ad"snce and S-4.00 althe door. Tables . re 55.00 In ..,....nce andS6.oo at the doOr. Talk';n on 146.341.94<W8WEI. For l icket s or more inlormation,contact Dean Wrasse K88MG. 1094 IlealRoad, Mansl ield OH 44905: (419).589-2415alt... 3:00 pm EST.

FRIDLEY MNFEB 22

The Robb;nsdale ARC will spon$()I' the

fmh annual Mldwint.... Madness HobbyElectronics 5hO... on Febtu.ry 22. 1966,from 7:00 1m to 2:00 pm, at reuee-creceHiQh School, 1350 Gardena A"en"" NE,Frid..-,. loi N. AdmiMion II $3.00 in advanceand S-4.oo .1 the door. 8-1001 tables are$8.00: 1/2 tab les .re $4,00. Eums ...111 begiven Talk·in on 147.00'.00 (I\ILTC}and.52simplex. For more inlormation or to r-ol.t.... ccetect me Robbinsdale ARC. PO Bo.22613, Robbinsdale MN 5~22. or call Bob.t (612)-533-7350(

DAVENPORT IAFEB 23

The OiIvenPOrt Radio Am..l""" Oub willhOld III 151h . nn....1 hamfesl at the 0.".e~port M u o n ie Temp'., Brady Street(Hlgh...ay 61l l nd 7th Streel, Oa"enport lA,on $I.Inday, February 23. 1986. lrom 8:00.... to 4:00 pm. Admls.sion is ~OO in aoj.

Vince: $3.00 at the door. Tlblel are avail·able by rese~ation 101 $1.00. with $2.00

e'lra lor ec hooeup. Table selup ~Ins at7:00 ..... Talk.;n on 146.281.88CWt8XAl. Forreservauons. ""'ance t ickets. Of morl in-

LA PORTE IN

f Ell 23

The laPorte ARC will sponSOf a ham­

lest on Sund..y. February 23. 1986. at theLlI Porte C,V;C; AudItorium. La Porte IN. Ad ·mission Is $3,00. Table, are $2.00 In ad·vance and S2.50 al the door, Telk·ln on .52

limple• . for more In lormaliorl. send anSASE 10 LARC, PO Box 30, La Porte IN46350. Fo. reere resetVat,ons. mart< yourco rres p o n denc e to the a!lentlon 0 11tA9PHA

GlASGOW KYFEB 22

The GI..sgo... Swapfest ...111 be held onSstunlay, Feb<uary 22, 1986. ~inning at8:00 am , at the Glasgo", Flea Ma. ke tBuilding. two miles SOUlh o f Glasgo", KY,just aU HIgh w..y 31E. Admission Is $2.00;no "dra charge lor exhIbitors. The Ilrsl te­ble 's free. and each add itional table il$3.00. T.. lk·in on 146.341.94. For more inl or·

mallon, coniact Mike Goad N4HCO. Route4, Box 354 . Glasgow KV 42141.

S~;" " ~

$ 1'" ' .%S~ I ' I " ~

$i'~"' ·>

$~ I ' I ! I~

S~~ ,., ..~S1 I""~

$11",-""

RADlO IUTBOX411SGrtemille, tlH

"'"1603187&-1(133teln &l!7697

1985-86CATALOG

50<

\1\ 11 n~ 11 .1\1 \1I . 1 ~~ , "'j .

\1\11 H2·:"'·1

\1\11 . 1-1 I ~I .'·s\1\11 Hi l m i ,S\1\11 IH 11K'S\ " IU' I ·...' .,\1\ 11.1U ·:\<I I .S

INV ERNESS FLfEB 15

The 5I<y HlgI'I ARC ...i11 sponSOf .. hamIlea market on February 8, 1966, from 9:00am to 4,00 pm. at the Citrus County Fa ir·grounds audllOlium. on US 41 sou ttl o l in­Yetness FL Admissiorl Is $ t .50 in advance

and $2.50 at ' he dOOl. License .,.ams willbe given. Talk·ln on 146,955. For more In­lormaUon. ...fIla 5HARC Hamltl$t , PO Box572, Lee4lnlo FL 32661. or Ull Bob GordonWII\UL at ~)-626.5045.

ST. CATHAfllNES ONTfEB I

The Niagara Penlnaula ARC ....11 ho ld Itsannual hamleat and Ilea markel on Satu,·d..y. February 8. 1986. ~innlng at 8:00am, at the UJoW Hall, Bunt ing Road. 51.Catharil>8$. OnlariO. T.. ,k';n on IH.2.cw.6 40. For more In l o rm a t l o n . con tac tNPARC, Bo . 692, St. Cath.. ,lnes, OnlarioLR2 6Y3. Can..:la.

ORAN GE NJFEB 9

The west Or..nge ARC will hOld a ham­lesion February 9. 1986. I rom 8:OO ..m 104:00 pm, at the Orange Elks Club. 475 MainSHeel, Orange NJ. Admission Is $3.00. T..­bles are SI O.OO. Talk -in on 146.55 and224.80. for more informat iOn. call MIke at(201)-73&-4611 afte< 5:00 pm, or call Rob ..t(201)-731 ·9506 or (201 )-674..s148 any time,

MARL BORO MAfEB 16

The Algonquin ARC wHi hOld li S annualhamlest/eleclronic Ilea market on Sunday.February 16. 1966. beginning at 10:00 am,in the Marlboro JunIOr High School cal.

POWER A~IPLIFIERS

Ifi 17) :?Ii:I·:!l ·Ei

i<"' ~'i:l" '",".~.,..i>'I ~,

.........._....._...._"., .... ... ..' I"'" -

•

70/ ' 18\-1 48

$199.95

plu, $3.00snIpping an.clnan.clling

Complete Kit

POWEll REQUIREMENTS:VoltiQe 28 VI)( fegu4.llllllCurre"l 2"- ~ln5mit. 65 rnA receoe

~" '"'' '''', " m 7""' B "~',I",R'"",..,, ~"'"!'1c.o ..... L\

IC"" "

J-1"....

ASTENN AS ,*,- ,, ,

LORAIN OHfEB 2

The Northam Ohio ARS wHi hold Its an­nual Winteriest on Sunday. February 2.1986.~,nn lng at 8:00 am. at Gargus Ha ll,

Lorain OH . Admission is $2.00 in advanceand $2,50 at the door. 8-1001 l abl" S are$7.00. Ta lk·ln on 146.101.70. For nceets 01

more inform..I Ion. ...rlte NOA RS Winl...·lest. PO Bo. 350(. Lor..ln OH «052.

The Punuuta....ney Amatev< RadIOClubwHi operate speclal"""""t stahon KA3CUYon Sunday. February 2, 1986. ~innlng at9c00 am EST. 10 commemorale GroundhogOily 1986. Frequancies are 3950 and 7.230101Hz x ORM. KA3ClJY "' il l calry a record·Ing 01 Ihe official prOClamation 101 thenext 6 ",eeks' ...eather (as delermined byPunxsuta",ney Ph il ). For a ce' ll flc at e.

send a OSL and 8 large SASE 10 P!'.RC. RO5, Box 14. Brookville PA. 15825.

PUNXSUTAWNEY PHI LfEB 2

"'Ill be: SS8-28.55O. 21 .350, and 14.250:

CW-28,0&I. 21.0&1, 14050. and 7,025. Fo'S6,OO, stalions working 1()(6BU ", l it be Is­Sued a tefi llicale, .. OSL and .. 64-pageboo" descrIbing the Bailie 01 I\ ",aial";n

and Rol·Namur. $3.00 will bring a OSL anda e...tihcate. All rll<'lueats SrKluld be sent10: KX68U. Box ...... APO San Francisco........

5''''' ' 'i W" "5:n<> ....,~.

i~........

!'>p«lrum Inltrnlliunll , tnc.PO\I Offict 80\ 1014S( ·unrnrd . "II" . 01742 l:SA

WORK THE U.H.F. BANDS

3 8-4 0 MHz05 ~V tor 10 aB SItl- 6 e1l e 24KHz. 60 d8 ,~ . +3 d8 out> 350 IfNi O'IkJ 8 ohms

•

"","".."", Il I C"" k,'I'" ~ "'c"",,"",1"'"'1 ' ''," " , IC_ I"

PEelAL EVENTS

RECEIVER:

'­Sen5l~", t,seec..,""­--TRANSMITIEIl :f requent'; 3 8- 40 MHzo.tput 30.,ns 0'110 50ohmsiKI - 30 ell1Ur ~l)I iiCS 7'" _ 47 ell. 3'" _~ eIl

SWR ImllUlIt, 30 1 0 ill phise ingIes....e Amplolled. lISt r~ .. Ie (lJl.'S' pnx:"sS#lClJ

TRA:-SVERTERS

The ama,eu f.ladi o c lub s of JohnsonCity, Easl Tennessee St ille Un i~ity. lindCart.r Coullty, Tennessee. ..ill Optl •• tt,spe<=lal-evenf Sla hon W(ABR on FebrtUlry1-2. 19l16, to celebrate " Homecoming 86"

tor the sl. l e 01 TltnlleS...ee, Frequencies..ill be the Io*er portion or a ll bands (in­cludin g Novice) lIS condo ' ions permit.Send In SASE 10 W4ABR, PO 8m 3682CRS. Johnson Cily TN 37602.

U$I'''ll'S in 'fils column . .. ptO"ldtKJ I'M01charge on II ~ee-."lIiI8b~ basis. The fo~

lo* !np mla,mltion should be Includtld If!

~ .nf/QUno-mfHI/; sponsor, _ " , ""te.t'm<!,pI_, city. sIaM, IIdmiSsion cfl " rpe (If

.nyA I",/unlS_IIJI~-In Irequant;Ms, a nd the"._ o/ *1Iom 10 con/IICf lor !urlllM in/orma·tion. An_I. must be lflCtlio«J by

73 Magazm" by,he lirst of ''''' mont". IWI;I

montfl.prior10 the montll ill ,,"iefl tfle_'llIII.es pI.ce,M. iI IOEd,tonalOffius, 73MlIg­IIllne, PmIlSI.• Pererbotough NH 03458

TN HOM ECOM INGFEB 1- 2

The K",.. ja le;n Amateur Radio Club ", Ill

operate llPeCi...-t at..tiOn KX68ll from0600 UTC on February 1. 1966, until 0600UTC on February 10, 1966. to commem<>ral e the 42nd annlverilOOry 01 the BaWe ofK",a ja le ln and ROl,Namur. Frequenc ies

COMPACT 75 M SSB TRANSCEIVER

Do,el_l$ 2" . 6" x 6"

BAnlE OFKWAJALEI N ..,NO AOt·NAMUR

f EB 1-10

70 73 for Radio Ameteure » February, 1986

IOfmation, contac t OaY<! Jon annsen, 2131Myl1le St ,ee\, Davenportl A 52804.

tALLMAOOE OHFEB 23

TI'Ie Cuyal'>oga Falls ARC will sponsori ts 32mj annu al Eleclronics EquipmentAoctloo and Hamlest 00 Sunday, February23. 1986, Irom 8'00 am to 3.:00 pm. atTallmadge H.gh Scr>ooI. Tall madge OHAdmlss ioo is 13.00 in advance ,lIIld $.a 00 atthe door. 6-1001 l ables eee $5.00 in a""aneelsend an SASE). Talk-in on ,87/.27, Forticket s 0< "'Ofe inlOfmalion, conl act BillSo ••nSky K8JS L. 2305 2 ~ t h Sireet ,Cuyahoga Fa lls OH 44221 (216p.l23--3830.

VIENNA VAFEe 23

contact MTARA, PO Box 30'901 , 5pringhetdMA Dl I01.

WIN CHESTER INMAR 2

The Randolph Amateur Rad io AsSOCia·lion WIll sponsor a hamlest on Sunday,Ma' ch 2, 1986. from 8:00 am 10 5:00 pm, a tthe W,nchesl er N;l t,0f\81 Gu-ilrd Armory.Winchester IN Admission is 13.00 {unOO<12 hee~ Spac," are $5.00 WIth a l aDle and$2.SO wltM ul (a ~a ilaDle by rese<vahon en­Iy), Talk·in on 147.901,30 and 224901223.30.FOf reservations Ofmore infoo-mation, wn teRARA. PO Box 162, Winches ter IN 41394 .orcallJake LI'e W9VJX al (311}-5&t-9361 orHer!) Jiunes WB9UlZ ill (311)-!i84~995.

DALTON GAMA R 8

Tne Oililon ARC will ho ld lIS annualhamlesl on March 8, 1996. at lhe NorthGeorgiA Fai,grounds, Callon GA. FUr/herinl Ofmallon may be obl aioed from tne IQ.cal HF and VH F nets or by writ ing l he Oal·Ion ARC, PO Box 1 ~3, Dalton GA 30722·0143.

MILWAUKEE WI

MAR e

The Miiwaukee scnecr o f EngineeringARC (W9H HX) w ill sponso. Its annualhaml,"t on $alu' d.1y, March 8. 1966. h om8:00 am 10~ pm, at 1121 NOfIh MIlwau­kee Slreel, M i l...aukee W I. Tic ket s are

$2.00 artod a-teet tables are $300. Talk·.non \46.191.79 lind 146.52 For mOle inl ot ·malion. ""d an SASE to W9HHX Fe~ t , POBox 644. Room ~. MII...aukee WI 53201

"'"AUBURN NY

MAR 15

The Auburn ARA w,1I nokl liS annuiIllWinterlesl on Ma.ch 15. 1986. Irom 9:00am 10 5:00 pm,.1 l ne Farm/Horne 4H Canl er, GIanI Ave.lRoute 5, Aubum NY. Adm lsslon is 13,00: tabies are $5,00. Tesling willbe avai lable. Ta lk·ln on 141,00. Formo,e In·l o,millio n, contac l Ro ben C . B runoW"2ITJ. I Birch Lane, A uburn NY 13021

GRAYSLAKE ILMAR 23

TI'Ie Vienna Wi' e!lr$$ SOC...ty WIll holdilS annual W.ntanest on february 23. 1996.D&ginning a t 8:00 am, a t tl'le Vienna C0m­munity center, 120 Cherry Street, ViennaVA. Admission is $-4.00(children 12 and un­der a'e heel. Ta ilgating is $1.00 (inclUdesone admission~ Talk~ n on 1-46-.311.91 ;lndl ~ 1.5 1 . For _ inlormation. ccotect meVIenna Wi.eless Sociel y. PO Box ~ t 8. vr­anna VA 22180.

ORRECTIONSAn ...rOf crept in tO Gary $a.gant·s " One-Ctllp Fac s.m ile" projecl lor the Atan 8DO (De­

cernDer. 19M. page 381, Ple4lse rep lace Fig. 1 ...ilh the conec t version shown here.

The Liberlyo,lle and M undele.n AAS * ,11sponsol l AMARSFE ST 86 on Sund.. ~March 23, 1986, I rom 8;00 am 10 2c00 pm.al Ihe Lake Cou nly Fairgrounds, G r a~ s

lake IL Admiss iOn is $2,00 in ad~ a nce and13.00 at U>e oeee. Tables are $5 00 eachTa!k~n on 147 631.03 and t 46.52 Fa< In lOf'mation Of reservat ions, ....ile Mi-rc Abl'ilm ·son. PO Box 6330, wneehng IL 6OD9D

TO "1A~,

,0.,TlOpon J

..,Co~M' 'O R[~~ .,[ ..· t .. ..Ul

RF ENTERPRISES

Radio Frequency ,\'o tes 11 15 P"'l!, . rn. on Di,krtl~ fo< IBM'

. U~. ll\n FlllN !'II~lworh. H....'n"nt Ci" uit . . ..I"

. C.. k n la l r VSWR, , ""'. 'p",d u'h

. Co n. ·.." Volt. Anlp . Po..·... ""I i<.. to d l:!' Requires IBM or IBM compa"bI.. comput..r " ·,Ih ",k Ul IUK 01 nl<moI l and ,,,,phJn '" col<>< ,'''p/>.uCII rd in",,,11NA._ -." c ..,"' ,-. .. ,_..,"...., _""_ a BO Ww'" __ , ~ '''0'' "' .... " ....". u, , -r ." " . .... " ~•.-.'-".._ ... "._T.,... _ • __ uo ••,.. p,.,_ ...

MULTI-BAND SLOPERS

.,ISIFA X 10NE oerrcro» ,~

r,-

cr ~60 0 T "-, , •I. I., • I, • I.

,~ ,..

;.- . ~ 2 ~ "

1"'"." ,

I, , I' , • !. I'

" , ,., T('

T e.,'0.

1" TOll <•.• •'"F{g. 1. TOIIe·detector schflmati<;,

3941 MT. BRUNDAG E AVE.SAN DIEGO CA, 92111

/

CHICOPEE MAMAR 2

The TeayS ARC WIll SponSOf a hamlaston Sunday, March 2, 1986, I rom 8:00 am to~ ; OO pm, at the K o f C e uild inll, 2489 No, thCOurt St reet. CirclS\lilie OH. Tic kets are$.3.00 in advance;lnd $-4.00 ;ltttle dOOf. Ta·bIet are $5.00 in advance and $6.00 al tnedOOf. For l ick etS (send an SASE) Of lTlOfeinfo rmation, con tact Oan Granl W8UCF,22150 Smi th Hulse Road, cucrevme OH43113; '6141-477-3026.

CIRCLEVILLE OHMAR 2

The Mounl Tom Amateur Repeater As·soela tion will hold its annual I lea marketon Ma<CIl 2, 19l16, I.om8:OOam to 3:00 pm,at ttle Knighls 01 CoIumDus EIde< Council69, Granby RolKl, Chicopee MA. AdmiS­sion Is $1.00; ladies and children undel 12are tree. Tables are $7.00 In advance and$8,00 al the dOOf. For more inlOfmation,

INTRODUCING SACCK,.or .... c )s"ml·...ul""'. tiC CW eon ~oybo.,,<l

(WITH INTERfACE!"""""' " . _ """__COO , .., P

~

.. ... 01_ O</T$, "" ....,.. .

.. IUG "".. CM. C G " " ~."'--"CIO" "" '_ nco.u.• • AUlOIf. nc , ...

...._ • Otf COOl -.e CMAooOt • ou.<L __ ......_ _ -0 IIOCM IIOCM_'. .

CRUMTRO NICSSOFTWARE DIVISION• .0 'roo, ' _COO CIoI.L· " ..,_ oa ,._It.•c_ , _

.....xa nc c..- _ ..

.... ...--_ "'"

ATIENTlON c ·ne OWNERS!.. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ....... Of' COlu"'''''''''''' M son w.., ""'-'"' ..•"""--"' .... ....c,. " TM. c· •• _

73 fo r Radio Amateurs • February, 1986 71

MODELSG·l00F$429 115

dfllinredI

-- .~.,..... _..~ ..SYNTHlESlZED

SIGNAL GENERATOR

MADE INU,.

• Covers 100 M Hz 10 \ 99.999 MH2 In 1 kH2 Sleps WIththumb...l\eel d ial ' Accuracy . 1- 1 pan per 10 mil·lion at a ll I raquene..,.,. · Interna l FM adjustable I rom010 100 kH2 at 41 I kH2 rate ' Ed ",nal fM Input .e.cepts tones or vooce ' Spu.s and noise ;ll leasl 6D dBbelOw carner ' Oul put a" lustable I ,om 5-~ mV at50 Ohms ' Operales on 12 Vdc tit 'I, Am p ' Availab lelor ImmedI ate de livery ' S429.95 del i ~efed • Add-on.ecesso l"les avaIlable to e",end Iraq range, add ,nl,­ni te resolu"on, AM, ilnd a preciSlQll 120 dB aU_ ·lor • Gall Of write 10< deta.ls • P!>one In your orde< aslast COO shIpment.

VANGUARD LABS196-23 Jamaicil A..s" Hol lis. NY 11423

P!>one; (7 181 468-2720

2317 Vance Jackson RdSan Anlon io TX 78213

15121 7U;'7~7~93~======~~

" When You Buy, Say 73·'

-

EVIEWASCII, and AMTOR WIth the unIt hookedup to m y 2AT, I partieuterly 11 08<1 being

eble to cperere p ac ke t and trildillonalRTTY from one setup. We have seva,alRTTY mailboxes on 2 metefs in add ition tothe packel .Ctlvity. AI' I had to 00 10$witch be tween the t1lllO modes was 10 goto lhe opllOIl menu. Select HF for bend(selling the modem 10 stendard mark endspace frequencies), and l!len go back tolhe m ain menu and select RTTY mode.

raoe a good 1000 at Iha PK-64 , For max­imum eflectl veness, I highly recommend

the optional HFM-64 module. Bolh piecescome to abou t $320 totalemallltlllill. Forthose wilhout • Commodore M .nd not

well equipped l o r assem bling e TAPRTNe-2 from the gl""nd Up. AEA has Inlro­duced the PK-tlO. 73 ...ill ~eep you po$ledon the reteet development s.

Inlorm atlon on Ihe PK-64 PAKAATT sys·lem is available Im m Adv anced EIec'fOflk:Applicetion,. 1<1(:.• PO 80. C·2160. tyn",wood WA 9!lOJ8; (206~ns-73n

Jim GI\Ibbt. KeElSpnngl;'ldll

CW TRAININGFOR THE APPLE

Le.rnlng Morse code has always been

one0' the less en;oyat>le Steps In obt.,....ing • ham tocket. C.W Tuto<so" .nd C.WTestmaster, wril1en for the Applfl II lamlty

of computers by Twin Oaks Assoc iates,cen m ake learning "the Code" a rathel en·joyab la expe rience, espec ia lly it you orsomeone you know Is one ot Ihe growingnumbe' ...1Ml are altrac led to amateur re­diO alter being first exposed 10 thl world01compulers.

The user·s guide and sh>lfy manuel sup.plied wit h the program state that C.w Tu·t o raolt and ne comps nlon. C,W.Testmaslar, are compallble wilh Apple II,

It + , III:. and lIa computers I'I aving • mln~

mum 01 &8K 01 RAM and one disk d'iva.The P«l9'8m will alS(! run on an Apple IIIcom"",ter uSing. prv--booted emulS!OI. AnApple lIa ayslem was used lor Ihls evel,... tion. throughoul wh OCh Ifle proglems per·l o rm ed Ila wiessl y, Fo. t h o se 01 youinte 'es led in tM line' cetene at th e ectt­ware, these programs utilize tha DAVID­

DOS diso oPMaling system neensec ',omDaVid-Data, rec., to provide last disk ee­usa during Plogrem axecutiotl.

WflUen by Or Thomas F. Uncle KlIT,C.W Tutorsoll IS an ...ceptlonally linetrain ing prog,am which trains Ihe user bycombi nin g t ha audib le CW tones w it hcharaclers pllnled on the Apple's hlgr..resolulion scree<\ as lhe varioos g'oops 01charactars are laught ThiS method is , 1'1

contrast t o 11'1. usual audlo-cesseU..metl>Od 01 • " Ieac her" spe.o;ng lhe char·ac ter name be,ore and alter the CW ver·sion. Th is visual/sural approach seemsmuch mOre natural s inca In most cases anQperalor will wrlla or Iype a CW messageas It is reee;......,

The program ie designed to grow wil hlhe user as helene becomes more profl·cient Each prog'am section (or FocusMen u, as the author calls Ihem) allOWs theuse' to vary the speed and pilCh of the CWwhil e lackl lng var iou s types of lessons,These menus will serve Ihe ...oul d.oe Nov·ice or lhe Extra--elass operator alike. oUer·

Ing 'our major er.. as 01 sludy: (1) thestand.rd alphabet lessons and dolls; C2Ismell . medIum, and lerge or comple.

words to teach word recognItIon; (31 c.lI·sign recognifion to prepa'e fo r FCC codetest s: (4f OSO phrases to help with on·l he.air "conversation" and again 10 maoe thaFCC exems easier. Each section allowlthe user 10 seloscl elther Noviee. Gener-el,exi ra. or "Good GneW speeds to Slud'ythe code.

your custom sellings can be saved to dlSOor eeeeette for l ecalt at enother l ime,

The PK-64 otters the slandard beaconmoda. The beacon lexl (BTEXT) is inputvia me command mode. Thare's also aneat fealure that ctnuee e messal19calledCTEXT. Thai Sl ands lor "connect ted."WIth Ihe option. ""I properly. your PK-64becomes e peckat ans wering machIne.When e slation connecls. the PK-64 $tlnds

• message 01 yoo , c l>ooslng, normally 11'1­viling tne connec l ing steucn to leave amessage fo r you and than d isconnect.

Perltaps If you aUended Ihe loulav,lIecorwention you heard the sound of lhe" conne<:l s"en" In the PK-64. It sounds abil l,oe an"end errre world" alarm - gu. r·ant eed to gel the allent ion of even thesoundeSI sleePM.

As In o t h er modas, bo t h a tran sm itbu t ta r and a receive butlar can be act i·veree. The raceive buller wil l hOld aboul20.000chalac ters. The l eYlew and ediling'eat ures of the sollware allow you to ma­ni"",la le l he received ted In any form youlike, Yoo ha... access nol only to the OSObutter Dot elso 10 10 message bu tlers.Texl can be moved sround hom one buller10 enol he' using Ihe spec ial edilo r. Ac·tually ii's a ratner complete word plo<;es·so, lI'Ia l a llo .... ed it i n g , saving, andto.ding.

Tile pa th used to connect Is d lspleyedIn Ille I\e<lder at connecl measal/l!'. Yoocan elect to stamp connected and manl.l ored packets with just Ihe ti me, the day

and lime, 0' Ihe month, day, and 1Ime,

I ean'l conclude tha discussion 0 ' lea­l u,es without lei ling yoo ebout two 01 myfaYOfiles. In lhe pacoet mode, the PK-64will keep t r,Ck 0 1 the number Of un·

acknowledged packets 'I'N ha..... sent Ih eQuenlly WQf!< over paths Iha l are verymarginal . pa r llcu larfy d U' i ng dayl ighthou rs. The counter eeeps me Instantly In·

f o rm ed In tl'l e event tne packals sla'lbacking up. Tl'>e<e Is also an on--s.c'een 0s­

cilloscope sho"*lng mart< and space tones

(more 01 a gee-*"'lz lea tu.. than it Is u_full. A perleclly·luned sig...1 maoes thepallem IooIl jusllike II should.

I'd like 10 switch Into o .....rd'i ve lo r e mo­ment and talk about using th e PK--64 on

HF. The uni t I lested InclUded tne optionalHFM--64 module. II Is iI modem mat usesthe same lechnology presenl In the CP.'compu ler pa tCh. Normally, lor the AFSK

sign.ls used on VHF operalions a muchslmplftr modem will wm k qulle wall. Wit hIha reduct iOfl in slgnill -to-noise ratio. andeddillonal tntarferance pre sent on Ih e lowfrequencias, suc h alm ple modem s don 'tperlo rm ...al l.

I..... r..ad meny accounta of high I rust.a­tiotllaYolls encountered by otl'>e<s I rylng totune pacoet signals on the popular 2().me.

l er peckel frequency (1&. 103 MHz), I'vedone a li mited ef1l<>unt of woro ther.. endhave found II 10 be much mOre dittlcullIhan woroing on VHF.

Preparing to be quite skepllcal. I con­nec led the PK·6& 10 en R·600 ".ce/Y'er-not the best or easiest radiO 10tune lor FSK slgnels. A quieo che<.:o 01the

frequency revealed packet activily and Iwenl to WQf!< tuning II in. Just as with the

CP·1, Ihe HFM -64 module mada accurateluning at the Ilgnal Qu ite easy. I had myfl'st paCket s tstlon tuned In and printing...i1hln 30 seconds! Approprlalely, it wasH. nk W'tRU 's bullelln board. I en~manyQlher 0S0s WIth almlla' ease In tu'"lng. Th e only problem I had w as I h e"bursty" natu'e of the packet signal as op.posed to the continuous tone trom a Anyslatlon ,

If thiS were all Ihe PK-64 did, it wou'dhilve 10 be one ollhe best velues In ama·teur lidiO loday. But you must not forget

that i t WQf!<s eQually well on CWo RTTY,

In my shack. It replaces _&I soU warepeckages and et least two interlKeS,

The box conlalning the PKM II lIyledin the same 'asl'l lon as Ihe PKT·l and Cpo1. It il small in slel ure and is deepe r thanilia wide. The " Ofll panel la undUllered.Depending on ...hether you have l he op.l ioniIl hlgtl-lreQuency modem (H FM~II",

atalled, the fronl panel Includes • OCO(nta carTier detecll and m l EO. WIth theHFM~ Installed, a Ihre-shokl conlrol and

a tuning indicator are visible. OthefWiMl,jusl • 'ed windo w and snap·l n hole coverround out Ihe I ron t 0' tne untt.

Emerging I rom the side 0 ' the PK~ ise shielded ribbon cable designed 10 con­neelto the~ expansion 00<1. Thel's tilesame one )"OIl use to plug '1'1 game andprogram cartridpes. The familiar 5-pin c0n­

nectors 'or radl<>inter1ecing.•udlo-in , andexlernal ·speaker jacks are Io<; ated on thelea' panel. An externa l ta ven-cc adapterIs aupplied and plugs in to. ' ear ccooec­lion. I had no troub le hooking l he unit up10 operate with _ral radios, Includingmy 1e-2AT.

WIth the PK-64 connec led and eYery­Ihlng powered UP. e simple SYS comm.ndbrlngs lhe unit 10 liIe. Now Ihe rear fun be.gin s! The main menu looks simila r to Ihat

0 1 Iha M BATO R soltw a,e pac oalie on...hieh Ihe PK-64 program is based, 5elosct­ing " P" 'or packel gell ua to tha t modeand ello*s uS 10 gain access to an options

-"The tooCh of a fu nction oey brings amen u wllh many options upon tne screen.Rath e, Ihan uSing the I,ad ltlonal TAF'Rcommand mode 10 set many Qf Iha param­eters (partieularly lhe Ofloe$ yoo seldom

cl'lange), you nHd only use the cursoroeya 10 higf'lligtlt the option you wish tochange. OnIoff funclions .r. loggled WIthl he return oey. Numeric inputs e'a enl eredI rom the keyboard fQllowe<l by a relum.The TAPR names like CONOK fm "con.nect OK" are used m are very close sothere ISno need to lea'n a new language,

Some 01 the options used In RTTY .ndAMTOR must be ec<;essed Ihrough thismenu a.s well. Thet's a IffIfY minor Incon-­.....nlence since II ' equlres coming backth rou gh the p ac ke t display to a ccessthem. t nere ale only a handful ot com.mands you will no,ma lly inpu t through IhaI:ommand mode In packet. Connect endetsconnect ;""ructions are Ih a mejolones. "'MY" ' ollo...ed by a space and yourcallsign sets 11'1.1 parameler. Incidentelly,

TO borrow a P''lril!lfl. the packet revol ....tion hilS becOfTl<l a process of evolution.Mankin<! as we kno w it hilSevolved slowly,but it !lflems that new dig ita l tech nologiesare boing lmplemeflte<l and Improved al·mQ$1 cwemighl. The C"'....,l trend in low·CO$I. WIlfNlile .mat.....' equipment takesanother gianlleap lorwa.d with ",[A'. in­

troduction of thoe PK.&t.At the 1985 Oaylon Ham.ention, \fle In·

trococncn of " ve'al padet·,adio TNC.all but stole the show. The TAPR peoplewefethe,e louli"ll ,he new IOW-(:~1 TNC2. Kant.onies brough t the F'kket Comm...n~tor. ¥Ill GLB and HNlhkjl displayed!hoe" WII'es. AU stOOd quietly in the COf·

ner with the PKT·l and showed off OoctCH050.... to the delight 01 the convention·goer•. were !!>ose all·knowlng smiles onthe faclls of the AEA stall?

With the publi<: showing of AEA'. PJl,I(.

RATT system at the ARRL Natiorlal eon......,tiOIl in louiSVille. heads lumec:t 10_the latest de,elOl>fT>ellta In digital C(IIn.

fTI\lniealiona, What Ihey sa w was notl'lingslMlrt of tl'le beat tl'ling 10 h appen to tl'lat

f ield since the Commodo"~ 64 computerslar ted selling for under S2OO!

New technologlu require a growing pe­riod. The amatlltlr commuRlly has beenforlu ...te that t". ~centeredin tneTucson, Vaneou"'9f, and washington DCarees heWl deYeloped digi tal communica­tion on tne I'Iam bends at virtuell y no coatto the emateu, I,. ternity ese who le,

Growth in any new mode ,eally ~inswhen gear becomea commerclelly avail·able. The PKT-l began the movement andcont,r>ue$ aa e solid, comme«:ial-gredeTNC useable with any com"",ter_ The PK·64 applies the tecl'lnology to tile rlIO$t fe·YOfite hem-shec~ machlne-ttle Comma.dare M. It does II at a price ($220f thatshould cert ainly prove 10 be " populer"with the ham communily.

II I slarted telling )"OIl abOut a ll of theleatures 01 the PI(~, 73 would ha... 10

add e S99Cial aecliotl just to hold Ihil r.view. The _tilltyand Cepelloil liesoithe

unit ere "most overwhelming.I can aimplily much 01 thit by suggest·

ing tha t you cheek the bac~ Issues of 73lo r my revie ws crtne CP-l compu ter patchand MBATOR sollware 'rom AEA. You see.Pl'KRAn not only operat" pecket like echampIOn, il gives y"" CW, RTTY, ASCII.and AMTOR operetiotl all In one package!

AEA PK·64 PAKRAn""DATA CONTROLLER

AEA 'a PK. -tU PAK.RATT.

72 73 for Radio Amateurs . February, 1986

T,.,. WA IGRC TPS· ' . The panl>oafTJ assembly is a modilicaflOl"l wh ich is hplame<fl In ,,.,.

/a~'

C.W Tuto ,sof t is a n ea"I 'a ,nmg p ,o­g ,am. Wi thin each 'eview. Ihe usa, mus ttype the 'e<;e ived leue, 0' ph,ase on theke yboa ,d . The p' og 'am igno'es any 'e­apcnse en tefl.d pflO' to the toomplet'on 01the mate,i al bemg senl In each 'e.,ew,lhe p ' o g 'am 'andomly sends you l h eMo ,se·co de male,ial conU"ned in lhesludy secl,on p'e<;eding il. You, lask is 10type wh a t you've jusl hea ' d OfltO tl'le kay.boa'd. In eac h 'ev,ew. tl'le p'og'am sco.-es\'OU' pe<fo<mance a nd w,1I send you OflIOthe ne . l lesson ,f YOU' lI(:ore e.ceeos mep,assmg m'lfk

The ned Slep up I,om C.W Tulorso" 's' IS comp,anoon prog'am. C.W. Tes lmas l",FOllow 'l'I11 mutoh Iha same ea,· I'a,n,nglecllnoque as C W TUlo<sofl. Tes fmaSI...goes a step beyond l)y PfO\'id,ng u SW,lh a n OPOOfIun'ly 10 copy vaflOUS 'an­do<n OSO-Iype dfliis. Add'honaily. lhe Pfo­g'iIIm p,ov'des two d ist in CI OSO~ *"0<:1'1 ll'le user is tesled on.One IS a ,an-domly-oene,aled mesn.ge",h o<:h "'iIIWS 13 Spec lfo<: poeeM of 11'1 10<'ma toon lrom a dillta pOOl 01 appropr-iataposs'Dohhes . The secOfld OSO me55a9" ISPfOll'ammaDle, allow,ng II'Ie u_ 10 seleclh '_.,..n va"able$ 10< the d'ili. 60lh 01tl'le OSO e 'e<cises a", IOllo wed l)y a corn­plelion QU'Z 10 tesl tl'le stuoenfs u_·stand,ng 01II'Ie mal""al p<ese<lled

60th C W TU IO<50h and C.W Teslmas·te.- a'e well-W1l11,,". we ll-documented pro­g,ams. Each sells 10< SJO.OO. a ,ea Mltla b lep"ce especially wl'leh compa'ed to ottle<compule.-·a,de<! inSI'uc l,on p'og'ams 10<the Ap ple . A mifl()f d'a wback a U"buled 10the use 01 a cuSlomized disk ope.at,ngsystem is the ina b iliol y 01 ma k,ng bac kupcop,es 01 e ilhe ' p'OlI'am. 8elo<e p u,cha s·ing eilhe , p'og,am. you ma y wa nl 10 cce­lact the fOlkS a! Tw,n OllkS 10 Che<; k onlhe" policy aDout bac kups. All In a ll. Ilhink you will find Ihese p'OII'ams e.·tre mely useful In learni ng CW fo ' the li'Stlime 0' p'epa ' ing to upg.ade to Ihe Gen.erar- 0 ' Ext'a -clas s lice nse

Fo' turth er inlo,me lion on the se p,od·«cts. con t act Twin Oa~s Asso ciates .Roule 5. 80.37. Kno••llle IA 50138; (5 /5;­842-6256.

TIm McOonOUllh W0 9EOTSp, lng llald IL

G.W. MORSE KEYS PEP/SCONVERSION MODULE

The,e a ,e many ,eaSOnS why it is mo,euseful 10 be a ble to ,ead pea k e nve lo pepowe , ,a th... th a n ,ms powe, on you' oul­pul or incidenl powe' mete•.

If you a,e 'unn'ng full legal pow... youneed to know wha l you. P EP is il you a'eto be su'e you a'e w,th in the ISOl). WatlPEP Ilmll. II you a,e ,uJ'll'lmgless Ihan IhatIt is sloll ......., uselul 10 be a ble to adjustYOU' o,ive 0< mIke gil"n to Ihe poll'll ...heftlyou' I,nilll is ju s t p'oducing maoimumpeak po...... on speech. Any d n"", past Iha lpoll'll is hkely 10 ,..,,,,ll in some splatt",a nd dIstortion land _, and loa' in YOU'I,nalsl.

The mo.emenl lind lhe needle 01 you'l"""II,d POW'" mel'" ha"'" 100 mUCh i"",·Ila 10 be ab-le 10 lol low speecr> pall...na. sotl>e .ead'ng you nom'lllity get on 'P"«h asII'Ie needle S"""IIS up and down <loean '1mean mucr>o You ca n lIssume Iha l ,I lheneedle bounces 10 about 50 wallS as youIlIlk. you PfObllbly a", p<oduc l"ll aboull00WailS peak ou tpul. 1/ you ma>... a lOng

....H HHH" In to tl'le m, ke. It ", ,11 p<obably,ead c lose 10 100 WlI tt S. Bul Ih,S IS allguesSWOf!< . Most people -.. to bel_the needle S1lOuId bounce 10 lull OU tPUIPOW'" as lhey la'k-t>ence II>e la."" num­be< 01 wide splan",ng signals ttle<e a,ea rotl nd .

I have seve rer po ...er and s ..., mete,abuilt inlo tbe ' ig and a nle nna ·ma lc h inguni ts. so buyi ng yet another me te , iust 10be able to read PEP was 1'101 a we lcomeprospect. t sa ... an ad I'o m Amaleu, Ac ·c"sSOfies IUnited Kingdom) fo ' a ccever­sion module t ha t wo u ld con ve" IInyforwa,d powe ' mele, 10 ,ead PEP. SO I sen t10< one. It ca me in a couple 01 weekS f,omG.W. Mo ' so Keys in Wales.

Th.. who l.. lhing is buill on II p'n nled cl,·CUl t boa,d 2.2!> incheS lOng .1 .2!> Inches... ree lind . tla<:hes ...,Ih a single mountIng11(:,...... On Ihe boa"" is one inleg,a led ci.·CUlt a nd aboul 20 p,asS;"'" companenlS. IIrequi'es II de inpul oI l,om 3 to 15 \fOIls (Ihecalltl<allOflls una" ected l)y \fOlIage tol'lanoe!lind tlll<es a bout 1 milliamp. TIle manulac·lu..... says Ihat Ih,ee .....a vy-duly AA Cf!'lIS in__ WOOJId run it 10<aboul9 monlh'scon­t ,n u o us use . 0' lIb o ul Ih , .. e y.. a , s ifSWI tChed oil wilen tl'le fig is flOt il'l use.

On the board. tneee a 'e " "0 til litl<ation'esisto<s in serie3 ""'ich ,eplace the m0ve­

ment 01 II'Ie e.ist lng mel.... The \fOItagegenerated ac'oss these is a pplied to a namplifie' ", h ic h c ha'ges a c apacllo.IhfOUllh a eeee. A second a mphl"" drivesthe mel",. The tota l ga,n is ul'li ly. WIthtOO % nega l"'" leedback.

The installa tion inS I'UClions a'e ve ' yeiIIsy 10 Iollow. a nd a dl3ll ' am is suppl iedshowing how to use II OPDT s... ifcl'l 10 ....mcr<e t..... de Inpul lind resroee lhe met'" tono<mal use. Id id no t bolher 10 dO lIlis . a s onkey_n CW 0< on the ··kx:k" pos,"on loradjUSting the rig. omS p<)We< and PEP a 'elhe same (SO I can meauSle ""'s a nyway!and I am ta kIng 12 \fOI ts de I,om the 'ig.

I installed tile boa,d in a Dent,on MT·3000A a n te n na tune'. The'e is II space 01a boul 'I. inch beto... the <:Itass is , sh ieldedt,om sl,ay rI. SO one hole in Ihe ChaSSiS lormounting afld One In lhe back 10 lake thedCca ble tOOl< o nly a lew m inutes . I just cuttbe e .isting ora ng e lead I,om s ...ifch 1ome!e, in Ihe 3000A a nd solde,ed Ihe le ad sI,om Ihe PEPtB 10 Ihe e . posed ends. Thismakes it easy to restore the 3000A it Iwa nt 10. by jus t loining the o'ange leadstogethe, again . This kind 01 le<::hniquesa ves a lot 01 notes in the manua l. Asc,eening boa,d Ihe Same s ize as the PCBis s upp lied to p ,o tecl the uni t I,om slray ' Iil it is installed close to rf fie ld s . I PUI it onjust so tha t I wou ld know whe'e it is in thefulu.e.

The p,eset pots for cahbration we,e se tdU flng manufaC lure a l halfway. and Ihisluned ou t 10 be a lmost correct tor Ihe 200­

mic,oamp mele' used in the 3OOOA. Ca li·bration was Quite smooth a nd easy (youJUSI m a ke il'ead the same on key-down a sil did belore you dabbled•. When yoo IlIlk.th.. needle «ees Quickly 10 the peak ,ead­ing and s lllYS Ihe'e. When you cease IlIlk­ing It deCa ys s lowl y. and one lap on lhem,ke pUIS il . igh t back to peak. As la' liS Ican see it WOtk s jus t a s ad'let1ised

It costs 13.15 English pounds includi"llpostage a nd packing lUS$l1.00 III thistIme).

Fo , mO,e inlo,mation. conlaC I G .W.Morse KeyS. 4 0 """, Close. Rhr l. CI""Yfi.Waltts

Bob Eldflclge V[7BS~berton, Brit is.h Columbia

WA1GRC TPS-1The WA1 GRC TP$-l is a Iw.........voIt-dc

poweI-SlJpply kil lo< lhe TA~(TucsonAm­a leu. Packel Radio) te<minal nodeconl'oI­.... and compallbles. The TNC. l comeseqUIpped 10< ac ope<ation only,,;a a POW'"I.anslorme' wh ich euscnes 10 lhe TNCcircuit boa'd ",ilh a seven-pin coneclo<.Tile WA 1GRC Tf>S. l plugs into lhe TNCpo...... conneclor in place 01the plug from

II'Ie POW" 1'. l'ISlom-. WI'>en an lHo-a·woll-dc power sou'ce IS apploe<1 10 the TP$­1. lhe TNC ope<ales as usual. USI ng 12voIlS de. the TNC d...... abou l 0 .15 Amps.

The mall'l lea tu", Ihat sepa'. les Ihis depower con.......... lrom o tl'Mt< . ystems de­v'sect 10 PO"'e' lhe TNC lrom 12 VOlts isthaI no rnodlhcalions 10 the TNC a", '.qui,ed . No components ha ve t o bechatlQed and no t,aces have 10 be cut. Itjust plugs in.

In Ia<:l. il the TNC"a Ii_volt ' ''9utator ismounled on lhe TNC's circUIt boa'd. theI,.nslam- can be .e moved ""tlfely. How·eve" ,f th. 'egul . tor Is mounled o lllhe c i.·cuil boa.d and ...nee to lhe translorme. 'sconnecting plug. the t,ansfo ' me' must '.ma in. a nd the connecting plug I,om Ih..Ifans torm.., is ptugged inlO a connecloron Ih.. TP$- l . Alternale ly. th. '''9uta lOfwi' ing m.y b. d ISc o n ne cted tr o m t heI' a ns lo .me . plug and wired to anothe'plug , which Is then inserted in to Ihe TP$- lconne<;to ,

Theo<y

Th" Tps· l contai ns voltage ·d,opping.swilching , and doub ling enecne. The 11 ·10·14·voll-dC source is crcccec th,ough10Uf diod"s 10 provide about 10 verts ec.The de sou,ce Is a lso switc hed th,ough aPNPINP N lfans istOf pai' I""d ing lhe volt·age -doubli ng c i'c uits 10 p,ov ide the . 2Svo lls and _ 25 votts (ma . ;mum) needed 10,un the RS·232 POrt on th.. TAPA TNC. Ofcourse, the Tps·1 o Ulput voll.gea will .a<yslightly depend ing on th e In pUI vollageand load cha,ac le,istics.

The TP$·I outpul vo ltage s a,e led!o theTA PR TNC's on·boa,d reg ula lors to p ,o­vide the ' ''9ul llted power ne<;essa ry 10 Oil­...at.. the boa'd

ASHmboly

The WA IGRC TP$- l ...asdesigned byGa<yField WA l GRC...o is lIOld by h im as g;11'Ie< acompIet.. kIlo< a ba'ecircu,1boa"". IOfde<edII'Ie complete kil. and if aorived by li,n c lilSSmail a lew days let....

The ;nstructlOflmanual isa lew pageslongand conla,ns brlel assembly II'I$lrucho<>a. aboard layoul olagtfarn. and a SChematic. TIleassembIy ....I smootnly,__. I Ol(! no­lICe ..",....i~WIth 11>e onslruc­t ,o n manual ", h ic h . il corrected. wo u lddeC.......... mblyt,me.

Assemtlly depends on Dotll tile boa<dlayoul d,ag,"m and the componenl 'i.t(...1100:11 a'e on dl ll"',," t pages). and l lOUndit botl'Mt<some 10 Ihp back a nd 10f1h eachtime I soIde<ed a lew components to lheboarc. The .esislon a'e ",I..'ed to by• • 1......nd t""". colo< code ia not men­tiOn«! : Ihus I had to took up lhe colo<codes to make sU'e . ...as installi"ll lharnCOf.e<;lIy The CIrcUIt boa'd Is s,ngle-sided

and does nol conta,n ma,tungs on .he

companen t side. SO cere mUSI be IlIketl 1010I1ow Ihe Illyou l dl3ll,am ca,..lully. W,IIIsucll • small kil lhese a , .. mInor annoy·ances. I\oWe1t.... il would be a good Idea to... a m ine the kil toa,e lully befOf.. begInnIngconSt'UCtlOn.

The companen!s we.-e mounled lind sol­de<e<l on tile board. II'Ie conneclo< "'11$

wi'ed, and t..... de powe.- cable ...a s ill·lac hed. I was linished ...itll a~y Aquick \fOlIage check matched Ih...aluesgi....,n in the manual . SO I ...a 5 su,e thateverything wei'll ", e ll du'ing lIssemt>ly.

Opera tion

Being able 10 . u n the TNC h om 12 \fOItsde has many advanlages . Mobile OPe,",!ion is possible, a nd it can be a 101 ot lun10 ope,ate patoke! while I'".e;;ng . Ma ny 'e­peale, siles ...he,e TNCs a,e kept lo r useliS digipealers have ba tte,y bllc"up sys·terns . a nd now Ihe TNC ca n ta ke lId. an­tage 01 !hem.

In my parlicula , euuenon. I plllnned tooceeate packet mobile and ponabre us ing12'.011 gel cells. I look my TAPR TNC· l,TPS·' , TRS.aO Mode l 100 com pute" andha ndle·talkie along wilh me on .aca tlonIhis pas l summe' and was looking forwa,d10 operating pac ke t dU'inglhe tnD.

I say "was" because on th lt fi,SI dlly ofvacation Ihe packel s ystem suddenlywen t dead. The TNC seemed 10 be o pe.at·ing no ,ma lly, bul I was no t able 10 com·m unicale ...ith it Ih,o ugh the compule.!Later, at tne I'Iolel. I di agnosed lhe crce­le m to be with the TP$-l . One 01 thes witchi n g " ansiSlO's h lld s ho'led OUI(p'obably d ue to ove fhea tino caused bypoor a i, ci'cula tion in m y ,..s l,iCled mot>il..selup) and Ihe TNC was no l gelling Ihe. 2S a nd ~ 2S volls it needed 10 ,un Ihe_ial communicalions port. As soon as IIocaled Ihe nea,es t AadiO SIlack. 1 ...pl ace d t h e S...itching I,a ns islo . a wil hhighe' Wa ttage ones in a Darling ton nel·...0<1< (see pholo) a nd was back on lhe a"in Short o<der. F,om this e .pe.-ience. I canInlo<m you Ihal il is importanl 10 keep theTf>S.l .......tilated.

Conclusion

The WAlGRC TP$-l 12·voIl po...... coe­".",... 10< II'Ie TAPR TNC I is......, uselul lorthose desiring 10 operllie a por1;r.ble or me>­bjle packet SlaliOn. II is II pleaSlJ'" 10 bea ble 10 opera t.. pack..1 independently 01the ac line .

The complele kll seilS 10< l"""'Iy dol·la , s and lhe ba,.. boa,d seilS IOf Ietl dol·

lars. For mo", inlormation. 0< to o<def,conlacl Ga<y Field WAl GRC, 5 P1u ll A_nue. NOf1h Reading MA 01864

Jonalhan Ma yo KA3TMltdill PA

73 lor Radio Amateurs · February, 1986 73

• •

SOURCES FOR TRANSVERTERS

BOVE AND BEYOND

All ~HISTO"S10011. ~ u ..1III/S r M CAR BONc""'''PSlr..,., " .,,,"" Ht WOUNDJ•m

ve' te ' port? No pmblem. The best bellS tolocale the OU lpul Irom the low·level , fs la ges before they go 10 Ihe final a mpMie ,a s semb ly. Simp ly b'eaking IhlS iine afldb,inging il 10 a 'ea'·panel conneclo'. Ihe"'unning a flOlhe ' lifle Irom a second con·eectce back 10 Ihe lina l g i...,. you the de­si,ed cOflnectioo. I employ Ihis melhOd onmy ICOM 740 10 oblaifl inc,eased d"ve forIhe MMT·se,ies modules. Jumpe"ng II\(!

Iwo ecnoectces 'eslo<es lull HF If.fl&­cerre operalion. On 'ee"iee. use troe nor·mal a nlenna COOfleClo< on YOU' HF 'Ig aflllconnect to lroe 2&MHz i·f outptll jack onIhe partlc u la, I,ansverler.

II your HF or VHF e .cile' ''''flS 10 WailSor iese. mafly 01 lhe I,ans....rter mak",SlIa .... 1!H1S pads 10 drop tee d,i"" Ie..ellowenough tor me t ' a flsmlt m..er. Or. you caflmake one yoursell oul of SIX 2·Wan 100­Ohm carbon resistors. Connect lhem asshown In Fig. 1. ThIS WIll dlSSlpale mosl 01lhe rl. leaviflQ a small af1'lOOJnl 10< U.. m,.·ers 10 work with. The allenualo< is gener.ally employed ..,th ,"·MHz multlmQ<leSwhen con'lefting 10 50. 432. or 1296 MHzUsually there IS sulticienl O"-in ifl troe 'e­cei..er ~I mi.", 10 overcome lhe lOSSes ofIhis pad. especially ...hefl used ifl Iheuansce;vs mode.

Olher HF 'adios Ihal could be used ...,Ihtn,s aUenualor include lhe Ten-Tee A,go­naut se<ies. lhe okIe< TS-l3OV, aflll .imostany ICOM ifllhe low-PO...er po$lhOfI. Nolealso that all 01 Ihe "ansl'ef1e<s cunenllyavailable ha.... bUlII-ifl SllfISlllvlly connoiS10 allow lor a ,aflOe 01 abOul S-3lXl mW ofdrive. so you musl nol e xceed 300 mWWhen in doobl. use a pad, A 1·WaU Signalpadded down by 15 dB I,anslalea inlOaboul 50 mW of d,ive-mo'e Ihan ade·Qua te.

Newe , modules p,omise inc,easedband ccvereee. Mic ,ow ave Mod ule s hasannouflced Ihe MMT 144·28R ...ilh Ga"s·FET I'ont e nd a lld 25 WaifS OUlpul PO...e'In a dd Itio n, Ihe re a ,e 1"'0 addifioflal LOI,equeflc;es incorPO,aled ifllO Ihe trans­ve rte ' to allow 10 ' s imp;e . a fld ~ 6O().kHlope,a tiOfl on FM. As p'esefltly conligu'ed.the cove'a ge is o nly 144-146 MHz Hhe Eu·'opean two·mele, ba nd>. but d,scussioflSwilh Ihe US imporle , ,eve a l plaflS 10 add alourlh LO 10 Switch cove' age up to t48MHz 10 allow ,epeale, use . 00'1'1 have atwo-meter eeee-steuco 'ig fo, FM yet?One ct the new t-aosverters amI the FMmodu le to' you' HF ,adio ",ill dO the t" ck.

The ke y nere is to ge t Ihe m,..,mum uset'om yo u' al'eady·pu'chased HF 0 ' VHFmu l1 imooe 'adios . ICOM has "nnoullCedIhe IC 127 ' m ullimode lor 1296 MHz. bul ilCarneS a ,elail p,ice lag 01 a lmosl $1000'For haU Ihe cosl, " l,ans"""le' could be

boughl thaI wo uld do much tne s"meIhiflg

Afl inle,esling development is the p,o­d uc tion ot a 22G-MHz I,ansverte ' by SS6Elect,onics o f Ge,many lor Ihe US ma'ketTh iS is not a n allOCalion Ifl Eu'ope. sosuch a device is a bit 01 a g.mble on lhepart 01 lhe fo lks t,om 1_lotm' Of eou'sa ,T,ans verle , s Unlimlled 01 Canada al,eadym.l1<els such,. device. based on lhe MI'crowave Modules design , For lhose ...hOpoeter to roIt lroe;, own. Haml,onlCs 01Rocheste, NY ma"'ets a tull!i"" 01 If"ns·'left8f"S lor 50. 1" , 220. and 432 MHz ,'''cludmg a model 11>81 perm'IS 2B-30-I,lHZ

a l 144 MHz a 'e dOlAlflcon ve,ted 10 28 MHz10 ' ,aceptiofl o n an HF ,eeeiver, Fi' s t.I,ansmined sig na ls al 28 MHz-typic a llyS- 300 mW o r d,ive_a,e led ifllO a dual·b a l.n c ed mi.e, . Iyplcally em ploying3r-l204· 0, 40822·type MOSfETs . BecauseIhiS is a II""., tra nsv,,"'''. it dOesn' t mal·lar what type o f modulation Is .mployed.The signal Can be USB. LSB, AM. fM . a lld01 COU''''. ON. This 1o...·level signal ismi.ed "" Ih the LO 'uflfling e t 1t6 MHLThe sum 01 these Ireque nc ies is ampll fl"",\1" MHz) ifl """,.1 $lages. all 01 wh icha le la"ly tightly coupled and employ m0d­erately high.Q tun'flQ ClfCu,ts 10 ensu'eadeQ ..... le ha,monlc lejechon. A POW...·am­plihed compartmenl thefl tak" the low·

level "gnal.nd ampI,h" In two s tages 10lhe raled 10-15 Wa n s outpul

On receive. a 3N204 is lyPiCally used asa tront -end ampliher. Thl' devICe usuallya .hiMs a noise hgu,e (NF) at ' " MHz ofabOut 2 dB. makIng It ""'Y acceptable lormost VHf work. This signal is l!'>en ml.edwilh tl'Mt 11&,MHz LO again arld tnis limethe dlfhH~ of t_ "equencies l2BMHz) is amplihed aflll ted back 10 l!'>e HFe 'Clter, Tun lflQ lhe~ ia 8C1;1)fT\pliSl'ledby tuning troe HF 'adio. In fact. lhe...··b1ack bo."",·· once tu....,. can Olt"" behidden . ...y out of Sight. as lhey usually'equi'e no further anention,

Simita, ufl'ls for 50. 432. aflll 1296 MHz.Iso employ i-f t,equencies a t 1" MH.z. 10allow tl'Mt person "', Ih Ihe I...o--mete, muf­llmode 10 add another band, Again. IhebeSI fea lu ,e s 01 lroe HF 0< VHF 'adio ere'elalned by USIng Iraflsvert&f1l. Say you...eot to work some ...eak OX on 1" MHz,but. local QSC close 10 you' f' eq uenc y isc aUSIng a RM or splatle', Yo u must swllchifl lroe SSB 0' CW filte<s Ofl you' HF ' ig' Tryhndiflg tn.em Ofla multimocle 'ad io .

He'" al KT 2B. I use Mlc,o",ave Modu lesOfl 14. MHz. 22Q MHZ.•M 432 MHz- a lid rlvsn by eilh.., an ICOM 740 0' a Ke fl·wood 430 On 1296 , I employ an SSB aec.tromce LT23S t' a nsv" ,le, wilh an i·I o r 144MHz. Incid"ntally, Ihe only mu ltimode Iuse_a Kenwood TR·9000-ls the " j.!"' lo rme LT23S, Th is is prima, ily because o r itssca nning a nd lasl s te pped tUfl iflg . which",e very uselui wh e fl 'unniflg up afld dowflIhe band 10 find a aso. Mosl o f theseunit s make provi sion fo, a se pa ,a le a n·teflna cOfl neclion at the lecelver Input. a l·lowlflg tne use 01 a n ou lboa ,d p,eam p 0'SWi tc h ing Ih,o ugh a fl e.,emal h igh ·powe'amplihe, il needed. I run mine alfaighlIh' ough a nd use OPST a ntenna ,ela ys 10bring e . lema! a mpii lie, s Ifl afld out 01 lheline. This is 10 al low Q>lP ope,alion whendes"ed,

Whal kind of 'ad ios c an be used ...ith "t'a flsv" ,t" ,? Mode! s wh iCh ha ve " ans·vert", p,o viSion already include Ke nwoodTS-520 se.-ies. sse. 1l2l1'll3O. 930/940. and430. Also ICOM no, 740. 1~. U5. a nd 751Many oI lheoider Yee.... HF ' ig s , includiflgthe FT·101 _ies. made pfO'lisiOn 10< a ne Itemal t'ansv"ner. and althOugh the Ufll lused lubeS. the rllevels a re surticienl 10<<!orlYlflQ a rnooe<n..:lay traflsverter. The CoI­liflS KWM-3t!O hilS a Uafl."""er connec·tion. aflll I C&fl lell you Iflal ...orkiflQ 5().

o,lHZ SporadIC E on a KWM·38Q WIIIl a Mu­I.... 5Q.MHz t'ans...",er is afl e _peri"""eyou ...,11 not bellave'

What if your 'adlO doe~Ifl'1 h..... a tran&-

MM T I,ans"""'e's. conll<lf1e's. ampli­"e,s

Tra nstnllllng a nd '8CfllYlflQ con';llf1·ers, preamps. amplifiers

Hamlronkt.. Inc.

Ha mt<on ics Corpo!-a tion6$0 Moul Road

HIlton NY 1.u6fl(711)1.392-90130

Speclfum Inlematiooal, IfIC.PO Bo. 1Q8<lSConcord MA 01742

a nd a wa y you go. Ha m u on ic s p'ima,ilym",ke ls Ihei, I, a ns _ 'e' s "S kits.

HOw does a " "flS-.erte' w0<l<1 II's reall yQu,te s imple: Incoming signals a l Ihe de­si'ed frequency a ,e a mplified by a 1.10 5 orG.....s FET device. rnese signals a ,e fhenm..ed wlIIl a n on·boa'd Iocat oscillafor(LO) 10 pooduce a dilfe,ence I,equency.This diff erence frequency is fhe LO I,.,.Quency subl,acfed lrom me incomiflQ de-­

Slfed VHF/UHF f,equency. a OO it is calledfhe i·1 I,equen<.:y-much as a SUpemel­erody"" ,ec"ivef workS. This i-f f,equencyis typ;e:.llly in me 'aflOe o r 28-1" MHz. de­

pendiflQ on ~"OU, needs anod lhe con'lefted,",00

Or> f,anstnlt. lhe poocess works in 'e­_, Troe 1·1 " equen<.:y is mi.ed w,UI froeLO f'equency 10 prO'lide troe desi'ed Ifana­mi' f,equency. Aga In . MOSFETs a'e mostconwnonly used in lroe m..er Sl.lges. Mosluansverters employ on-boa'd rt power am­plll""s 10 bOOSf lroe con'lefted I'ansm,tsignal to abOuf 10-15 Wan s out PUI. Ne.....I1'IOdefs lrom some o f the European man­u laclu'elS ,un mo'e powe, (25 WallS).maklf'll Ihem ideal 10< d'iviflQ grounded­g'id t,iOde amplllie<s. such as lhose uSing887. 0< 88n lubes a nd even tile new3CX800 and 3CX1200 lubeS.

'"How muc h?" you ask. The a nswe' isIhal you can pu,chase a l' a flSll<ll1e' 10lake CiI'e 01 you, pa rtiCula, band requne­men,s 10 ' a s tow as $199, No .... that's a bigd ille'ence I,om the p,ice o f m e mul1imodemenllOfled beto 'e , a nd you' perlo rma ncemay aclua ll y be belle ' 10 boot Conside,this : A Iraflsverte, is a line a , device , Whatyo u pUI In, you ge l out (mosl of Ihe time !f.The onl y IImila lions a,e c,ealed by Iheoertormance 01 the in di vid u al dev ic e sused ifl Ihe "ansverte" such as Ihe MOS0' Ga AsFETs ifl the Imnl end 0 ' tne mixe'd ev ice s . Still, if s an e.ce llsnl way to addto your slaliofl complement wilhoul b'eak·iflg Ihe bank . And tne addlliOfla l Saviflllscou ld be towards a powe r amp Of a mast ·mounted p'eamp it desi,ed,

Lilt's look at a Iypic a i I,ansverte, lineup.One very popula , model is Ihe Mic rowa veModu les MMT 144-28. ThiS uflil la kes 28·MHz s ig flals afld upconve rts Ihe m 10 t.4MHz ....ith 10 Walts o f rl , Received sig nals

The FoX Shack52 Slone",yck 0.,,,,,Bell" Mead r-lJ 08502(201~7HI0'3

MM T l,aflS';IIf1eB. converlers. ampli·he,s

T'.fls';llf1eB Unlim,'edPOBo.62ll6Stalion AToroniO. OntariO. Cafl&da M5W 1P3(416~;rsg.5562

MM T t'a fl$'lefte<S. COfIverle<s. ampl~,-Mul..... LId.• a nd sse ElKlronlca

tee VHF Shop16 Soulh Mounta,n 8ouleva,dMo.lfl l. ifllop Pll. 18707(8OCJI.HA M-7373(717)-<174·9399

Mic'Dwan Mod ut.1

T'.flsve"e's . conve,'e,s . p'eamps.amphfl'llfS

TlliS monU>". column is p<ompled byseve.al l"Qui.;!!. hom lOCal hams regard­

ing ll>e mQSl COSI-e tlec',we ... . y 10 gel asigna' on 'n" VHF bands. WIth lorn...~l\al hOi'll 10< the a_. amaleur,

thiS i...n ""ill of ...., conc&tn tor thosewllO WOOJId h~e to upg'~ thei. p<esenl

HF capabdihes Of ..so:! mo<e VHF/\JHFNondS 10 those already In servICe.

Conside, Ii'll! "am who purcha.e...wooing SlallOfl IOf ... melerw. ...,tll multi­

mode ''''10. be<1m. ancl amphller, MOSlh~ely he Of She wit! ha"" fa s.he41 our about$1CJO...8OO to come UP wIth the lQO.Watlstation using .. high"Ool'''' yagL WIllie 1111'might not seem an un,eaSOl\&b!e aum, i'could Yl!'fY ~I be duplicated '0< each ""'ban~ ~_ '" .,m,la. llfltup 10< ,« M Hz.

u~ng .. I(l().Wan mull'.......:lde and hilll>-o.'1'1Iong-boom yagl . would come in ilboullheume 432 MHZ would be s.milarly pOced,

and ,"" n"wcome, qUIckly dele,mine.that the e~~se lust isn't wOf'lI'l it

But Chef.. is "OOllle. solution: trans",,"­e,s. These magocal lillie bo.es allo... I I'Mt

use< 10 employ e.,Sllng HF 0< VHF gea, 10ac<=en Olhe, VHF 0< UHF b.nds, If we U

designed. II\(! perlo<mance Is lop-d'. ..."'..fMl .lIlhe besl I"alu'", of lhe e.iSllng HF0' VHF lfansc"iv", ..e ,elained n.e., llC.fl·fliflg. memofles. e . I,. vfo·s. SSB!CW fil·ters. "fMl so Ofll.

"Well, ...he,e do I ge l Ofle of t hesebo.es?"' muses Ihs crceceeuve VHFe" Agla nce Ih rough The CUffe'll amal..u' magslum s up nOlhing-.' least fo, ' hoSl! look·inll in Ihe "ds of Ihe I.'ge reten ou'lel•. Allone sees Is multimodes. mu lllmodes , mul·lImodes. Look againl The ,,, a,e at leasllo u' m.nutactu'e's o f l , a n . ve , le , s en­g aged in .cllve ly se lling thei, ware s: Mu·te k, ltd.. and Mic ,ow.ve Modu le s . ltd. , ofEn g land. SSB Elec tlonics o f Ge rma ny,a nd Hamtroorcs 01 aocnester NY, The,ea ,e ofhe, manufaclu'e's of these device s .but Ihei, ma'kellnll eucue in Ihi. counlrya,e '101 on a level wllh meee lo u,. The Eu·m pean manu laclu'e's sell thei, uni ts ascomplele lesled bo.es-jusf plug 'em in

Peter H. Putman KT2B84 Burnham RoadMorris Plains NJ 07950

74 73 lo r Radio Amateurs • February, 1986

operatIon l rom a l «_M Hz i·I ' The unl ls aresold lOfIparately as a ltan.mlt convetlerand "'eel .... conv... rte,. A typical VH F Irans·vener wou ld cost lIbout $t 2O. base<! onlhe late.llIds

I o "en hellr rumen tha t the big three inJapan l ICOM, KeniollOOd. lII>d Yaesu~ .replatltlitlg 10 come OIJt wit tl lrllnS.ef'1&tS lor

the US market The se rumors wou ld tendto be suostanti ated oy tile " transverte ,"accessory socke ts and connectors foundon many of these "gs. As 01 yet . I Ila...n· t

seen a SIngle one, bull "",n guarantee tlla tIf sales 01 the Europe. n . M NO<1h Ameri­Can Iransver!&ts increase by II sizeableamount, we'U Ila... plenty 01 p<odue ts tochoose I,om in short order, InCidentally, Imen tIoned the Yaesu transverters tor IlleFT· l0l serres; Kenwood also m arketedlfans_t&tS l or 1« lind SO "'1Hz lor useWIth the TS.520S se<.es. TI'>tty make se<.vM;eable unIts i l you can k>elIte them atIlea markels and Ilamlesls , But lor tlOW,

no tll ing ttOm Japan.It you tee l so Inc li ned, you can oblllin a

eouple 01 B&W COf,x swi lctles and selectup 10 Iix I ransver1:&tS usitlg 28-MHl i,ls'This is Iimilllf 10 a system I employ here,

Wllere 3 d<tterent bands are selecled inde­pendently lo r the T5-<l3O$, 11 makes 'ap ida SYing lor p'earranged sc hedules a realpl easure. And a s was mentioned earl ier,yOlJ Can Ilille lhe boles away il t>eeded , toN'" on shell space. All t l'>tty requi re it

138 -.oIts de afld some sort o . k llr)'ing l ine.unless'fOlJ use the in t&tnal rI·sensed key·ing tlla t many provide. Tile SSB Elect,on­tee LT235 prcvtdes an on·board etteouatcrto allow direct drive I rom a lO-Wal1 multi ·mode 1«·MHllranscelve.-.

Wllal's coming do*n the poke? Hig","perlonnance Iransver1:&tS lor SO t ll'OIJgll2J(M "'1HZ. using GaAsFETs a"" d iodeml .e' s 10 improve dynamic , ange andno ise l igure. Transverte,s will be a.ailablefor the new 902·MHz band shortly as well.

Bsndswitched crystal LOs will allo w l Ullco.e".ge ot the deSi,ed b an(l . • nd 0 1COlJrse. all-mode Ofl\II'atoon is poss,ble onany Dand, I'll be r.......... ,ng some 01 thesenew models as they appear on the USshores. Look tor review s ot the MMT 144­

28R shorUy.

M. ilbo, Depatl......t

This month we I't6al I rom Aust.alia in

the person 01 Roge< Ham son VK2ZTe whoIs th e edito' o t AuSI,. II.II ElecltOllic sMOlll llly. a slick gene ral.lnterest publica­Iioo not u nlike Popular EIBCltOlli~s hereRoge' tellS ot tl lS Interes l in 1000ecastingsporadlc-E p.apagat ion on Ii' mel &tS a""

two met"", afld is Yf!'t)' i llte,eSI"" in 11M!

s tud y p ubl l Slled by Sid Liebe, manW A2FXe w h i Ch 1 mentioned lIl . e ralmonthS ago . Il would seem that there hasbeen a su' ge Inlnter"st In Ihls topic do wnunder, and Roger tlas many cle_ OOse,·..tions pert.initlg 10 spotadic·E ptOpIQa·l ion. One in part iCula' petlains to antenNIslack'ng when ""'Of!<ing "sca tl&t waves"(as Ile relers 10 Ihem). Bs""" on Obse",a­tions he and Rod VK2eaJ made, the opti .mum performallce obtainad wit tl stacked

5O-MHZ yagls_working p'imarily sporadicE-was w ittl the two beams 10 l eet . part,or about ~ waY\llength . Roger l urt""" 00........ Ihat " an tennas SI~ked one wave­lellgtll apart c.n ott ell act 10 cencetseane, s igna lS much ollhe t ime. as slac k­

ing lo r max imum plalle·wa.e gain resultsin ga in degradat ion lor scatter s ignals."

Roge ' pu b lishes t ile 6· UP newslette,whicll contains much usel ul in lormation

.bout A ussie acti.,!ies on tIM! VHF .ndUHF b.nds, as well as . e_ at pr.ct lCalenccne 10' construction. A design lor atI .e·e lemen t 50·M Hz beam is a lSO lea·tu,ad. It makes l Ot good reading and 1

hope Roger will conlinue 10 lorw. r<l is·

sues l rom time to l Ime. One last Slorywhi~1l C.ughl my Ilr)'e was 11M! attempt byDon RiChardS VK2eXN to woO< au,o ra lscatt er I,om th.. Alll a,c t ic dU'ing a ecten­Wic expedi tion, Appa.ently Don was topursue a eourM ttlat WOlJ ld lake him un·<let the auror.1 c urtain. so he had theunique e,perience 01 tryitlg to ""'Of!< bolhcon...nt ,onar back·scane, and l rant ·sc. t·l er! Altt>oogh Don was eqUIPped wltn 100Wans and a single yagi, he made no COli'tecta w ith s ta t ions back in Tasmania andsout tlern Austra l ia but d id hea' laint CWIignals lit one 01 the ap pointed times

Inciden t ally, I he Ship on w ll iCIl Donmade his voyage was the Dick Srn,,1t b ·p lorer, which t ;lssume was the Ship de$.

tined to to w an Iceb e rg In t o Sydn ay

H arbo' some years back. What will th osefo lks I ,om VK·land think 01ned?

Unt il ne,1 monlh, see 'fOIJ Abo'ie and

...,..".

aOAL..--__I

radio? Belter we concentrate on what to

say and how 10 Ny il. Mo st 01 OIJ r c0m­

merc ia l equ ipment wm get tIM! messagelhrough QRM a"" ORN

When I'm 01'1 phone I c.n say, '·You<.u­d io is cle a r .nd unders tllndable andpteaeant to hear. How do I sound?" Arid

you can bet he'll tell me ill detail what Isw'o ng w it h my lIu diO' Tfl e ll the re li rethose contests wh&te everyone is 59 un·less you cen't he., lhem.

e,a...,. Jim, bul r ll wall !or some Olher

sugg estion that can beat YOU' ai'll.

Sta ll Sta llofd NJ8FDel.w.r. a H

Docember, 1985's "ORX" colum n tal ksabour " Tile Fin.l Exam" series by Dick

Basil. Now that Ihe AARL inclu<Jes FCCQuestio n s a " d ans",ers In the ir s ludyguides. I hope th. t you WIll rel&t to theleague as "in l ;lmous" as weli 01' you willbe guiltyo l the worst kind 01d,sc,imination!

C lyde Grubbs W8.TYAJ. meSlown N O

DiC. Ba sh lIs.ed Itams ' 0 w" te dOw "questions.nd allswers from the h llm IlS/hey ",a/"eeI ou l of lite test i llg roo m; ItlS"s /ud y fluides " we", simply .9,bal.m COp"ies 01 tne FCC 9 ...m. IlIlacl, Dic. ad.ised

'n:aminees to i fl llON! tn.. warnillg priMedOil Ihei, les'~t!te ",. rni" fl til.,s"id, " All. ttemp" .. '0 copy 0' drwu!ge e..m",atlO'Jq .....st;olls is " w;o l.t;o" 01 FCC "',., lor",/licit pellillries . re ptowided,"

Ulldflt the n9.. '9S/illg !fructu~, . It 01tile qU9stions 10 ' eaclt ,,19m9111 a~ I" l itepublic domaill. SIIICft 1 1t9~ a~ se.,...rat

Itu "d,ed pote",l a l q U9sl i0 lls 10 ' eachex.m. ,t's . irtu. lly impoSSIble to memo­rize " tIOUgh m.terl,,1 to pass a 'e,/' TheLe. gue (.lId o ,lters} publish", . tu d yguidfls witlt "IISWe's to help 1I11 appllcalllunderstand Ihe i"'o,mllliOIl h9 0 ' shetre9ds to Upg..d9; 'his is 10lally dil19,tml

from 'lte werbatim r"flurfllt.tio" 0 / an­S~ by Bash'. p,adu91"s.

CIyW. you men'~ ' ltll ' you 'H eh •Novice c/llss _f)' 1"", LIlt me IlS* youIhls: Do your s,udelllS P/ln thel, . ..ms

bec au S9 t lla y Ulld ersl.lld Ih" 'ubi9ctor because they 've m 9morized I .... ,"'tyallswet$ ?_ K W10.

1

59 -20 d B1 1

A. J. M W SVSRNew 0 1'1. LA

"Improve YOur Aud io Report" (Novem·eer. t985) is good advice. J im W20ZH has

done 1111 ou tslanding lob analyzing and<lOf;umenling the ......clIOI' goocl aut:liO anda bel1&t report Ing system. His message is599 (ORI 10).

Howe.e. , .maleur ,ldio is s ti ll a pre­

cess 01 establishing co m m u n ica t io n sl inks in a Vilr iety o t modes alld me<lia, notjust high·power aud io 0 1'1 the 'ag~heW(l('s

bands. II RsT i. OIJt 01 date, Ihen so life 0signals. TIl' e e d igi " o . RST a,e badenough, leI alone 5 digits 01 aRI' Lel ' sleave RST to aRP and IeI'll get f100d .udiOby th e use 01 l ec hno logy ~bellef eQuip.ment. mlc.ophooes. and level conUo l).

Since wh...... Is hi·li audio needed on ham

we," 11'1 1950. The Nov ice P'O{jram was stillnew, AS I recall . ttlere w&te three license

1eYeI•• tou' " I'OU eounl the TechniciallS:Noyic e . Te<; h n ic ian , Gene ral, ;lnd Ad·vaneed. (I'm omillillg 11M! Conclitional l i­cense.) The NOVice license was good lorone year and was nonrenewable. the cth­

erS good lOr l ive years and ,enewable.YOIJ couldll't be a Novice lor more than

a year, a"" you eouklll'l be an A<lvaneeduntil 'fOIJ had been a Gener.1l or at least.)'tIal. I don1 1hink the' e was a 2O-wprn £0.I . a t icket untIl t951 o r 1952. No.,ces had

only CW pfivileges on 80m and maybephone on 2m . Ttle 15m band wasn 't a.ail ·able 10 lIn)'One yet. Generals had a ll b.ndsl or CW and phone on lOrn, while Aoj.vaneedl~ gol i l .11.

Wha t in M..im's name is wrong withthat sys tem? NOlhillg thaI I call see. T1>eNovice s had incentive ;lnd the Gene ralshad apprenticeship. I think tI'lat all t tle tal k. boul inc......t ,ve licensitlg woukln 'l be nec·essary i l tnat licensing Slrue l u,e had beenmaint.ined

Olle 01 rite worst Iltillgs I lle FCC lI"s everdor>e to ham radio ",a, W!tell ''''y madrt

' ' '' N ovice t;c."se re",wable. How mallY"car_ Nov~s " do I'OU 'lt ill" .re ill rn", ,,,,,,, now? Ami how m.llY will 'Itere ".

.Itv tile " , upe, Novic,, " tic."t I' .v.i~

able? SHms 10 me Iha l Ih9 '9I1e wab/9

Novice licellse Is all illv/lalioll to slaglla·' 1OfI._J( W JO,

I

FINE WORK!

GOOD OLD DAYS

use a comp ute,- Compute,s a'e tascin.t·

ing to children. who a' e exposed 10 themboth a t home .lId at school. e ul ama teu.'adlO is jusl lIS I;lscinahng' Ou. problem isI h . t w e Ilick expo,ure. W e need10 "'00< togelhe, to .e'SO!.... this prOblem.

So. If we w.nt las l illg gro w th. maybe weshould o'~anlze and p ress",e h.m m anu_l acture,s to dollate Ot discount radio g.... ,to schools a"" yout fl gtoupt;, 01 couree,this woukl be pointlesS wit l'lOut tna sup.port 01 the amateur·,adio communily to

develop a"" ,un the P<Ollrams and cl,,1)8that would be neede<l. What good is a ClO­nated ,adio il it sit s In a closet because

nObOdy knows how to use il? Furthe" wemust not e....... te Ihe ent,ance-level exam

beyond the capabililies 01 young Clliklren,The NO'Wi<:e license Is vitatly important 10Ihe hobt»',

Regarding the Nuiler e,idge by eill Vie­88rS KAKI ("Wheatstones Are No t Cr ack .

e.s'''. Sepl"",ber, 1985l: FI"" wor1< ! Thet,llIe gadgel works perlec ll y and costsonly . lew dollars 10 build. 1'... ...- t llreeolt""'" so l ill. l he lasl one combined wltn.50·0hm. tOG-Walt dum my lo. d. Til eb'ld~e is excellent,.S ttle,e Is 110 rl beingradiated whi le resonati ng tne antenlla 0'tun ing the I,allsmi ll&t.

Barrillt Coal" VE7 AOKPuchland BC

J. B...c lt Tlnk• • N9FJOBurlnglon IL

About YOU' alls_ to Kl<2W's lett..... inthe NovemDef. 1985. issue. It's int&tesling

Ihat you and he have apparen tl y d,v&tgent.iews aboul the NOVIce license and p,M.

lelles-and Illat nertner or you Is ' i~ ht

Want to know whal' s right? Maybe I' lltell yOlJ . but lirst I"Illell yOlJ l he way th ings

1__-

1 1

ETTERS

VITALLY IMPORTANT

I musl strongly d,sagree wlUl lne opt,,"

ion "xpressed by William Itt&t N9EWA ill

th e No . em ber, 1985, " Lelle.s" column.Though It Is no t th e ma in thtust 01 tlis let·ter l11e. impl ies Ih. t the Novlce-<:I.ss Ii·cense " essen tIally worthless, not only in' Is lechniCal e 'petllse, tIllt .1'1 its priyj·-From perSOllal ",perience I Can say tflatone reason mallY people sh y aw ay I romamaleur rad io Is tllelr lea' o r a 10llg andinvo lved test 01 ' ad io theory. The Nov iceIIC......se MtveS as a relali...ly painless "1'1­try POlII! to el pO!l<t the oewcomet to thee'~II"'g posslbllllles 01 lIm.teu' 'adio.S",c" the technic.1 requirements 01 theNo vice license are sligM, the N o. iceshould 1'101e , pect to ea rn a wea lth 01 p, iv·

ileges. ey design, Ihe privi leges .re lim·uee. The idea is t flat once the Novice Ilashad ;I teere 01 whlll " am radIO is and Illisd'scowe<ed how mUCIl mote tllefe is to doin this inc.ed,bly lIe..ble tlobby, tle 01' sheWIll be motivated to st;ly In...,loted long

enoullh to uPll,ade.I agree that "an Increase III Our rank s is

nol going to come f,om elt""" l ew&t ' ....stri<:tlOtl$ 01' great&t p<iwile9"." bul thellue5hon 01 ptivile9" is essentIally irr.......ant 10 entlcinglhe newcon- to am.teu.radio. However, since amaleur radIO iscontinually c hangin g. t he p, i .llagasg,ant ...d Nov ices stlould be pe, lodically r....• ,ewad,

Anot""" point M r. Iller makes eeoc....nstIM! in'lOl\oemenl 01 youtlg child,en WIth

comput&ts. Most kidS who beCome int&t·ested ill flam radIO get the" start th,oughIhe Nov ice license, Ch ild 'en a s young asl i.e ha.e passed Ihe exem. I wonder how

m;lny child'en WOuld be turned away f,omflam radIO by the elimination 01 the NOVicelM;ense? How many fi""'Y"a,-oIds do youknow who could pass the Technician lesl ?

V;I"OIJS ,adio jOlJ,nalS have ex pressedthe ir concern about the 'is ing a.e'age ageo f the ham popu lat Ion. Do we want to all'gravate this probiem? We musl realizeIhat there is no e.am 10 take before I'OU

1__1

73 for Radio Amateurs • February, 1986 75

-

Progtam "sling 2.

just ",h a t can be done "" th packet , a nd Iam impressed , Olhe r Ihan a sho ' t tulor;alp'es ented hare a Ie'" month s baC k .though , I have not covered much in tha'ca mp. Let me know whal you th,nk, yea ornay, for lut u.e coverage of th IS new lop;e.

Intf!l'eSled in copyino commercial RTTY

s ta tio ns? Joerg Klinge l'lluss has broughto ut the fou rlh ed,lion 01 his GUIde to Uri!·

ity Slations whic h is aboul ten percentblgge, tha n last year's' He 's even Incl ud­ing VLF and LF stalions now. pIus meleo­rolog ic .. 1 FAX s tations, a nd mo re. Theguode sells for DM60 (yo .l.e on your ownlor conve,sion to dollarsl and is a.a ilable!,o m Klin ge nl uss Publicalions. Hallen ·loher St ,. 14, 0 ·7400 Tue l>inge n, federalRePtlolic 01 Germany, Yo u kOO'" ",hosename 10 drop, right?

-. few monthS aqo I mentoaned the ne_CoCo keyboard t hat ",as appealing ,ns tores. Selling lor « .95, th is hll ltl "'onderspo-ts tau' keys no t on the orig inal CoCokey board: CTRL. ALT, fl , a l'ld ea I won·de'ed out loud about some eouwere 10 pulthese keys 10 use. Well.anolhef old lr ie"".BoD Rosen, mentions thilt Soecm,om Protee t s, PO Bo> 21272. 93-15 86th Orive ,Woodha.en NY 11421, is selling a prog,amthaI allows eeee fou' ke ys to add a 96OQ.

ba ud POKE, te et-sc reen dump, LIST com·mand , a nd COld sla". The CoCo k....tlO.ardenhance. is II-Ilpplied on diSk lor $t• .95

Rea.ponse on lhe reprlnl set18S has beenmoal g ra t, fying, w,th many 01you ~ssino

along indi.idual StOf'es 01 how some ofthe inlo,malion supplied has helped youto get o n RTTY. If you wouid like a list 01,e pn nl s a.ailable, each of ",h ic h os e x·tracted a nd upda led f,om ma ler,al pub­

liSl'l8d in IhlS column 0\'lIl' I"'" pas t n,neyea's , send a sell-addressed, s lamped 111'\'

velope to me at the abOve add, IISS, Each'ep,lnt Is $2.00, In case you are c U' ious.b ul send lo r the lis t lirs l, OK?

Don·t be shy about inciuding o the r corn­ments or q uesllons whe n you aSk tor therepr ,nt hst . I.ead every one a nd try 10 a n.s_ as quickly as I can. Qu ite a lew atyou I'lavelound Ihat a nswers to ques tIOnssubmilled 0 1'1 CompusefVfI ha.e appearedon t he same day th e question was sent'Mail to Ihe abo.e address, or EnyPlex toP9'I ~2501. I look lorwa,d to you 'comments. questIOns. a nd inlormation.

Many of your quesl lOhs aboul specifocp ieces 01 comme rcia l RTTY gea' ha.'"been lo "",a,ded to Ihe ,especlive manu·facture ,s 01 th e eq u'pmen t, but Ihe re ·spcneee ha.e been slow In coming. I don 'lkno w il a ny 01 tnem 'ead th is col umn,""'ich c learly is one 01 the k.>f'lOIISl (lite10nges t ?1 runni ng RTTY columns, b u tleedback hom them is n,l, 101ks. I can onlyprinl "'hat informa lion I.eeei.e, so ill a mnot say ing muc h a boul a con.ena" nodeccnncuer computer, 0' whale.er, il ls "01

because I am blased or Ignorino that line:it's eeceuse I have 00 in larma l lon.

Inlormation to share? Welt, lhef. cee­la,nly ",ill be some ne. l month . I ~ no'" be­

cause t see some 01 ,t s illing on tneclipboard a lready. It you wanl to see whatif Is going to be, don 'l miss lhe ne xl edi·tion 0 ' ··RTTY Loop."

10 PATCH. liAS20 RTTY . LOOP f ES 8&30 MARC 1. LEAV EY, ~. O.

..0 THANKS TO RICK KOCH ~BIBRR

so PCLEAR 860 M-&H207770 READ D$80 If D$- "ENo" TH EN E~ D

sc POlE II,VAL("&H"+D$)100 !4 -!4+&KI110 GOTO 70120 DATA lA, 50 , BE, 20 ,8E ,1 0 ,8E130 DATA 01 ,09 ,EC,81 ,ED,Al,BCl~O DATA 3 r , O ~ , 2 3 , F 7 , I C , A r

I SO DATA 7E,01 ,091&0 DATA E~D

OICC I$ ~O

LOX ' ! 208ELOY ' 0109LOo X++STO Y++CMPX U3f04ilLS $2080A~OC U ArJ MP $0109

1A 508E 208E

108E 0109EC 81

"'''8C 3rO"2J F7I C AF7E 0109

20 712079207C20802082208..2087208920 88

lOAOMed . nd EXECe<l wifhou t p.oblem.WIlile Program listing 1 is Ille assembly

version ol lhe Ioitder, a more p<actical s0­

lut iOn lor many USflf$ will be Prog,am li$l­' ng 2. nils Basic progfam Will, when ",n,pullhe loader in memory a l t he correct rc­

ca tio n. TO USe thi s sche me, e nle, the pro­g,am a nd sa... It 10 diSk as PATCH ,BAS.Then Ptlt lhe tape w,lh NEWRTYCW in lherecorder. Type RU N'"PATCH and ",he n lheOK prompt comes back, type CLOAOM" NEWRTYCW",&H1f 65 . The t ape willload, a nd you will get anolher OK, AI th atpOi n l, type SAV EM"RT TY",&H20 71 ,S H3fOol ,S H2077 and you will be all set.NoW, t o go on lo RT TY, jusl typeLOADM '"RTTY a nd EXEC the p<og.am.

My lI'lankS 10 ROCk Koch , Ernie Ma,quezKP.EIH, Rob Rochelle W....o.o.z. Georgef undl s Kl).IRC, Cal.in Mcc..'t hy VE3LMP,fred Wood WB3JK C, Ga ry Be nder, and . 01course , Clay Abrams K6AEP, along withlhe milny othefs whO e xpressed a n inter·nt in RTTY on the eoc:o.

T!>e sheck of the month th is month is a

b,t unusual. InSlead 01 showing a shackwllh a ham sitting there , thiS is rea lly aham in his s hack l Cia y Ahra ma sent a longthe pncto ct his new computer shaCk, w,th

quile a displa y on the sc.een! I'll say th is ,

aay. n i$ d,II"',,"t'The f'lUSllu,g jKansasl Repeat'" Orga­

nizahon , Inc ., graced my manbox withIh .i, hU lieli n , Tne Pmcf asr inll tO' , IhiSmonlh. Looks like a n ac li.e group outInere, with a ,epeater on 1.($.&4 MHz andall kinds ol functions, Of RTTY nole in Ih,S

OOllet in is anothef version of the inc'N"ingly pDpI,Ilar ...f SK generator based onIhe XR·2206 lunc t ion gefl.." a tOf. Ham s inIhe Pltt sbu,g a'ea may wish to lis le n 10.3.(1.9-4 , or contact PRO, Il'Ic ., a t Box 1303.f'l ttsbu,g, Ka nsas 66762-

Is pecket a part 01 RTTY, or 's il il SlIP&­r~l1e interesl? I ask because I have beenCl'le<: king into H...MNET on Compu$erve

lalel y, and mu<:h , il not a ll, 01 the d iscuS'sian there in the RTTYIAMTORIPacke l sec·lio n is on the gro",ing topic 01 paCketradio. ... buddy 01 mine has ~trated

I

'/1111 111111111 1111111111

r I It

Shac/( o ll" e mo"lh.- K6AEP

This . e rsa lii . piec e olsollwa ,e is avail­a b le from Clay "'b. a m s Softwar. , 1758ComstOCk Lane , San Jose , CaUlo.nia9512• . Whiltl I don'l hayti a ClJI1'ent pOce. Iam $Ure lhat aay WOUld be glad to help you.

No "" lhefe a,e a lew problems. Unlikeeve ry other comp ute r program me ntionedhere to d a te , this nne seems to Caua. t he

hack.r inslinct to flITlllfge. NEWRTYCW isS1J Pphed on lape only, and a ay tetls me

thaI t"""e a,e no plans to .elease • d iskvers ion. ...lIhough lIans lening Ihe lilPeprogram to diSk does nOI allo'" diSk 110 oro lhe, dlsk·bued ad. ant ages, il does prp.male Iaster. more convenl.n lloadlng ",ilhless chance 01 a load error. To that end.

many-no. most of you - whO w,ot. ",ilhYOU' p<ais.ea of the p<og'am inc luded you,o wn scheme l or transleHing t h is se lf·booting copy-protected program 10 diSk.

I wrole 10 Clay and U ked him il heminded my publishi~ such a seheme.and he said that he did not mind, OOt Ihalhe f;OI,I ld not. of courw, endorse or S1Jp.port SUCh a ~Iched program. So, ,I youha Ye purchased a copy 01 NEWRTYCW,' ead on.

01 all the schemes I lOOked at, t he bes lis to ollsel-load t ile prog,am, delealingthe auto·boot, and Ihen mo.e it baC kwhere it belongs lor use. The mosl elegant01 these is shown in Prog.am listino 1.Submilled by RiCk Ko e h WB 18RR 0 1Derry. Ne", Ha m pshire, II is a short load­er ro ullne a ppen d ed to t he Iro n t o fNEWRTYCW The modi lied p' ogram ma ybe SAVEMed 10 d'Sk, from ",h ieh it Can be

o ur old fri end Ctay "' b.a m s calledNEWRTYCW, Th is program. w' ilt e n byMike MeekS w....VEf, Is a mactnre-ren­guage program ",hich leatures t-eoeee'veO(lerll ion in CW, RTTY, and ASCII . Four" s t a lio n bulle.s" a'e maintained , .achone 2Sot bytn in length. These can be

loaded a t t he baginning of a seuion.There are two la,ge bufl~, a "keyboard"butr. r a nd a "r.c.i. . .. bulle" both 01whic h ar. 12K In a 32K COCO. These bull­e rs can be typed into or p<lnted out on thestation p<inllll', as the need dictales. f ullranges of 00 and RTTY speeds are $Up.pofted , and t n e p 'ogram in t e ll a c e sthrough lhe "b1t-oanger" RS-232 port onthe baCk 01 the COCO

TTY LOOPMarc I. Leavey, M.D. WA3AJRli Jen ny LanePiKesville MD 21208

well. I do ge t taken abac k once ,n •wh ile, ancl . phone calli ,ec:ently received

dlCl jus t ,.....t. Frank Fox W....6KGD te"pI>Olled me to ,M,ca'" tllat tile news 01the death 01Supef·RATT was a bil p'ema"lure. 11 seems that he has assumed thedIStribution 01 th is program, ....,lIen lo r1M Apple II. 11+ . li lt. and 11<.: . It requ i,e.48K of RAM a"., one d,Sk dnv. and inte<_

laces w,lh an outDoll,d term"..- ' ""'I andAFSK geoe<ator us,"1l TTL-Ievel aignala.He tells me It,.u the P"Oll'am is availablefor $79 f,om him at 18ti Isabella St root ,Hayward, California 94544. If you like, you"'.Y 'each him by telephone at (415~5J6.

1832 afte< 5:00 pm C.hfornia lime. and on_ends. Do lila ... to remind rou 10 lellh ,,,, you saw i, r.e<e? I lllOuQhl not !

Now. the planned RTTY compute< tnismon th is tne Radio Snac k Color Com·puler&, alSO known as the TAs,soc 01 theCoCo. Thi s lillie g&m 01 a computer hasUUQhIII'Ml eye 0 1 many a ham. bolh for ifSeeonomy II "-ytI seen ,he 16K model selling

IQf IIISS lhan S90 ill my local SIQfIl) and IQffhllllaSll 01p<O\lrarnm,"O the 6809 CPU

Unfortunalely. fhiS eese of use, econ·omy, and con.eniencelS nof ma lched witha ple thora 01 RTTY programs. In teet, onlyIwo c o m me rci al prog'lIms were men­loaned m 11 11 of your input.

Kanl'onoc s , which p<Oducea a version 01Ihen Ha msolt program for moSI of tilepopular microcompulers. milr!leIS a ROM·carlfidge . e,Sio n for fhe CoCo, One o f youwrOle with some obse"'alions: "Opera·tionally, il requires TTL s ignals. no l RS­232. I had no f,ouble connecting ,f 10 myIllIm'linal un,t] and ll,ansceivef~ II naa abuill·in parallel p<intf!l' port, bul no oocu­menlalion on using II outside c t the peo­gram . [The ] documen lalion is onlyadequale; no sche ma tic [is supplied~ Sup.ports CW trom 5 10 99 wpm. RTTY speedslrom60 through 132. ASClllrom 11010300baud . Tflere . ,e a .....mt>e< 01 uNf ul confo~u,a ho nlopera l,ng oplions , 10 lOadablel<Kl·itable messege buffers . and a Iype.aheadbu ller, It runs wi lh a 4·way spht ecreen Ona normal 32 ~ 16 CoCo screen. On the

ltOOd side, II eeee work, liound no OOgs.b" lIII. The aboYe lu tures a ' e nice.

"Milny 'Iillltl lhinos: though. add up to apoor ,mplemenla lion 01 a ltOOd Idea. Thetime-ol<lily c lOC k loses aDDuI 1 minu te in8 hours. The control func tions on Ihe ke y·bOilrd a re eilsy to remembe" but im ·possible t o Iype oee .hand ed (li k e< CLEAR> <S ». Thefe is no 'q uick.Io&d'me-aaage OOller lor u N d urino 0S0s. Youcannol c ilia, the Iype--ahead OOller. Thesyslem is mucn too s usce pt 'ble to noise.E.en low·le . el ORN makes Ihe CW·recei . etunction use less, RTTY seems s lillie bet­t er , but s W I less n o ise immune Ih a n

seems right lor a eoc:o. The tee.... CWspeed must be ca lcula ted only O.ul, l lime;send'no et lhe receive speed is almosl a l·"'ilyS too last. The CW algorilhm taCkSslal>ility. W,th CR N II ", ill iump Irom 18 to8B wpm in ol'le Characler l ime -one O RN'pop' ",ipes ou t Iwo c ha ' ac te rs, usually,

'" I needed a progr..m, IoO I ..m glad I haveit. 001 I know I'll be "'''' ' no one 01 my ow nas eoon as I haYe the hme." "'h , yes. thelime; don 't ",e all wis h ",e had it!

Contrast lh a tllrm", a re produc t wl lh an­o the r o ne Ihal is la, a l'ld away the mostpoflu iar choice, a program markeled by

76 73 for Radio Amateurs · Feb ruary, 1986

THE MOST AFFORDABLEREPEATER

ALSO HAS THE MOST IMPRESSIVEPERFORMANCE FEATURES

(AND GIVES THE", TO 'I'OU A$ STANDARD EOUIPMENTII

HIGH QUAUTY XMTR & RCVR MODULES FORREPEATER$, UNK$, TELEMETRV. ETC,

NOW-FCC TYPE·ACCEPTED TRANSMITTERS & RECEIVERS AVAILABLEFORH!GH·BAND& UHF. CALL FOR DETAILS.

• R144/R220 FM RCVRS for 2M or 220 MHz. O. 15uV Asens.;8pole xtat filler & ceramic filler in I-f, helical / a,; . ' ~~I",resonator Irool end for exceptional selectivity. 'd'l~~ . 9 ·> l00d Bal ± t2kHz,beslavailabletoday.Flut· ~~~.; ~ C' ,.tee-proot SQuelch. AFC tracks drilling xmtrs. . '.~.':1. ~

Xtal oYenavail. Kit only$138. [ ;"cy ', ,- .~~. :.i '• R451 FM RCVR Same but IOf uhf. Tuned V .. / )

hne front end,0.3 uV sens. Kitonly $138. . .• R76 FM RCVR for 10M, 6M, 2M, or 220. As above, -,-OJ

but wlo AFC or net. res. Kits only $118. AlSO avail w/4 pole IiIter, on ly $981ki l.• R110 VHF AM RECEIVER kit for VHF aircraft ....,,$'

o r ham bands or Space Shuttte. Only $98. ~.

• T51 VHFFM EXCITER fOf10M,6M.2M, Of j" .~~~~~22O MHz.2WatlSCOflt inUOUS,up t03W \ \ , -:,0 #~

intermitten t. S681kit.• T451 UHF FM EXCITER atoawane.Kitonly$78.

Xtal oven avail .• VHF & UHF LINEAR AMPLIFIERS. For ertner FM or SSe. Power levels

from 10 to 45Walts to go with exci ters & xmtg converters. Several models.Kits from $78.

$880

$980

WiredBand Kit

10M,8M,2M,220 $680

440 $780

FEATURES:

• SENSmVITY SECOND TO NONE;0 .15 uV (VHF),O.2 uV(UHF) TYP.• SELECTIVITYTHATCAN'T BE BEAT1BOTH 8 POLEXTAL Fil TEA

&CERAMICFILTERFOR > 100dBAT :i: 12KHZ.HEUCAl RESON·AIDRFRONT ENDSTOFIGHT DESENSE & INTERMOD.

• OTHER GREAT RECEIVER FEATU RES: FLUTTER·PROOFSQUELCH, AFC TO COMPENSATE FOR OFF·FREQ TRANSMIT·TERS. SEPARATE LOCAL SPEAKER AMPUFIER & CONTROL

• CLEAN,EASYTUNETRANSMITTER;UPT020WATISOUT(UPTO':DNWITH OPTIONAL PA).

RECEIVING CONVERTERS LOW·NOISE PREAMPS MINIATURE PREAMPS

M~s locove' eNef'I ptacl lcal rf & II rangeto listen10SSB,

FM.ATV.etc. NF . 2 d Borle$$.

WIRED$34$34$34$34

KIT

".'19'19".

TUNES RANGE120- 150 MHz150-200 MHz200-270 MHz400-500 MHz

NEWMODEL

LNW·1 44LNW·l60LNW·220LNW-432

*

Hamtronics Breaksthe Price Barrier!

No Need 10 Pay sao to $125IOf a GaAs FEr Preamp.

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FEATURES:• Very Low Nose:0.7dB VHF,O.8dB UHF• High Gain: 13 102OdB, Depending on Freq .• Wide Dynam iC Range fOfOvefload Resistance• Latest Dua lllate GaA sFEr.Very Stable

-n '

' '''_1 06.~

' .... 106.~.~

27-21.4

.-~~.

~

1 1061 -1 .~.

~

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'005-1' 1' ... · 1.....lOll_WI1"'- ' 06=m=~m-~

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...$39...

VHF MODELS

Kil with CaseLess CaseWired

SCANNER CONVERTERS CopyIlO6MHzbando.,~ac.n­ner,Wiredllesled ONLYS8ll .

MODEL TUNES RAN GE KIT WIRED-

LN$-144 120-1 50 MHz $68 '98LN$-l60 150-1 80 MHz $68 '98LN $-220 200- 240 MHz $68 '98LN$-432 400-500 MHz $68 '98

• MO·202 FSK DATA MODULATOR. Run up to1200 baud digi tal or packet rad io signalsthrough any FM transm itter.

• DE·202 FSK DATA DEMODULATOR• COR·2 KIT W ith audio m ixe r, local speaker

amplifier, tail & t ime-out timers.• COR-3 KIT with " courtesy" beep" .• DTMF DECODER/CONTROLLER KITS• AUTOPATCH KITS. Provide repealer auto­

pa tch, reverse patch, phone line remotecontrol o f repeater, secondary control.

• CWID KITS • SIMPLEX AUTOPATCH

GaAsFET Pre·amp ",il ll fea·lu," ',ke LNG.Automaticallyswi'ches out 01 line cur-ing lIansmit Use with base Of mobiletrall $ceivers up 10 25W. To", ,, , mtg hd wr illcl.

NEW

ACCESSORIES

Price

$49$49$59$54$64

PRICE

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Tuning Range

143-150MHz21 3-233 MHz42().450MHz150-174MHz450-470 MHz

TUNES RANGE

2&30 MHz46-56 MHz

137-1 50MHz15().172MHz21D-230 MHz400-470 MHz800-960 MHz

MODEl

LNG·28LNG·50LNG-144LNG·l 6QLNG·220LNG-432LNG-8())

Model

HRA·l44HRA-220HRA-432HRAi )HRAi )

Low-norse preamps withhelical resonators te ­duce in l ermo d andcross-band interfe rencei n critical applications .12dBgain.

'59...$75

,.- ~-For VHF, -- """'"Model XV2 ~ 1"'_1.

•• ' 005- 1.

Kit $79 ~ ~

v -v . 1...·1....Wired $1 49 .~ =m-(Specify band) ~. =~

1"'-1011 eo-sa- ''''- 1081"'_10l1 .~

ForUHF, .~ m~

Model XV4 .~ ~,

~. m~

Kit $99 ... G.,_,a G~'

Wired $169 '''''''S20!ot 2M_

UHF MODELSKit with CaseLess CaseWir&d

VHF & UHF LINEAR AM PLIFIERS, Use with above.Power levels from 10 to 45 Walls. Several models,kits from $78.

For SSB, ON, AN , FM, etc, Why pay big bucks lor a mull imode rig lor 8ach band? Call be linked with receiV<! COllvaf\·ertI for tran_IV<!.2Walts outpul Yhl. 1Walt uht.

Phone orders 16 171 595-2275 aec:epted when paid by Me, Y iN orA mertc::1ln El(press. No COD' ' o r collect c all' please. F ree c lita loguelWailabie o r send $ 1.00 fo r first c lau service to J ohn J. Meshna Jr.,Inc. P. O. Box S062 E. l ynn, Ma. 01904.

g

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.1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111Il1II11II11ll1II1II111II1I1II1II1ll1II11II1UIIIIIIIIIIIIIIIIlJIIIIIIIIIIIIIIIIIII'l

! John J. Meshna Jr. Inc. I:: 5- P. O. Box 62 19 Aller ton St. E. Lynn, Ma. 01904 Tel : (617) 595-2275 i= =~ Mesh na IR & Starlight Ni!ttlt Scopes 5_i_ Night VisiDll for Sporti ng Pu rposes _= Security & Surveillaoce= Nat ure Studies =5 Lab & Pho to Studio Wurk ::= =- -- -- -- -- -- -5 A ::

- B §= ::= =- -i5 AllnfrilRed Scopes. We h ....e sever" fR seopes availabl B. PietlJred 55 is one of our long range scopes shown wI opt ional IR source. It "CrimeStopper" ULTRASONIC ALARM SYSTEM 5:: featu res and lSmm t ube. l OX eyepiece. 13511'111'1 f 2.8 tens wI an =:5 in te rna l niead b attery. I t is a very versa tile, c ompact instrument All-In-One Unit: Sensor, Au dible Alarm & Fl ashing V isu al A larm! =! :}~i.n~~n~rf?r42o~R ~~~:r~ :e~7~:nr~~~, se~~~=::~~~~~, ::~t:u~'a~~:e~~0~~~~~~:;I~r::~~:~;:~a~0:~~~~~~ ~- in te rnal battenes (app roll 75 ft. range) and a handheld unit wI an e ffec tive deterrents to these in truden. The Crimntopper gives you _= =:: ou tput of 200,000 candlepower for m8ll. IR viewing whieh reo- both a startling hiltl intensity sound alarm and a bririlt strobe light =:: quires ... external 12v battery pee 1ge1 pee or equ ivalen t! . to alert you and to f ri!tllen away intruders. The self contained unit _5= l ong Range IR scope SPl -133B-41 $ 425.00 producn an ultrasonic been that ewers an adjustable area of =:: Medium range IR source S Pl . 13SC-41 60.00 apprOllimiltely 500 square tee t, When the sound _e pattern is =.::: Handhe ld long range IR source SPl.1J6A-J 9 125.00 not distu rbed, the unit remains silent. However, when a movemen t ::- -= brea ks the silen t sound wcwe p atte rn . ho th the sound alarm and =:: the st robe ligh t a re ac t ivated. Featu res - manual o r au t o reset; _g_ BI 5eeond Genera tio n S tarl ight Seope. Perfec t for nigh t surve illance range control; operation on house cu rren t o r 9V battery; auto- _= It U $8S an lSmm 2nd. Gen. intensifier tube, eoupled wI a 2x eyep iece malic swi tch oeer 10 battery back-up if house current fa ils ; delay =5 135m m f/2.S lens, internal high voltage supply and rech argeabl e nlcad exit and entry ; and simple operation. Comes with warning sticken ;;;;:: ban...tes, It _iWis only 24 oz.. J O d ay warranty. l ist prie. $ 2795.00 a.:'d booklet cO\l'ering _operating instructions and security tips. New, == 2 nd Gen. :>ta rfight lCope SP l - 156A-4 1 $ 1750.00 nicely packaged In o n gnal factory boxes. Makes a nice gift fo r == Fin ed ca rry ing case f Of" above ~l-1 56B-41 $ 65.00 someone you Ieee, o r fo r younelf. 2:= Shpg. Wt. 4 Lbs, S Pl·154A-4 1 $4o. ooaa. == =- -- -- -_ DUAL FLOPPY DISC DRIVES BRAND NEW, dual f loppy d isc d rives made fo r Digita l Equipment Co rp. :::: IDEC model no. RX 180 AB). This beau tiful piece of computer hardware _- -= consists of 2 Shugart compatible T EAC 40 track, single side, double den- ::- -::: _ sity, 5"''', mini floppy disc d rives brand new in the case with their own ::- -:: r89Jlated, switching pov.er $Upply, fan, & onloff switch. Each unit also =- -= comes with a line cord & documentation. These were made for DEC, but ==- -:: are also compatible with IBM, TRS BO models I & 11 terse compatible wI =- models II I & IV when used wI E L DOS o r DOS Plus l, Color Compu ter & E_ o the r Shugart compat ible interfaces. Nat urall y y ou suppl y the cables & =- -5 disc control le r ca rd to suit you r particula r system. T he RX 18 0 runs on e= 115/230 'lac S0160 Hz., switch selectable. Each system comes in the orilt =

inal fac tory box & are guaranteed functional. A Blockbuster of a buy !II= Shpg. wt, 201b. Stock no. RX 180AB $220 .00 ;;5: Modified to run on Tl 99/4A cerscner computer system 52B5.00 e- -= Cable for TAS 80 Models I, II, or T I 99 /4 A alsocwailable 15.00 2:

e Rechargeable 12 V Battery Pac == We have a limit ed quant ity of these very h igh E:

quality n icad sub-O eeus, T he cells are rated §I I I 1.2v (i 2.2 amps. There are 10 cells /pkg. for

§ I I a t otal of 12vdc 2.2AH. T hey are the same =

I I I I I ditl meter as a 0 cell , but only 1 3 /8" tall. T he ~pac measu res 6 3/S". 2 Y".. 1( 1 3 /8". 6" color

§ coded leads. Should be perfeet for battery= back-up systems, radio controlled models &

? t hor dPo' ,t abIO, ;'Nems 0fr pull it a pa rt for tho __=~Indiv i ua eel s. BW, actory o verrun.

=

1= ~;:~:~s,~~~I~s~~:e~~~~?ea~O~ ~O~:CI:y~~:t~ ~.;~~ MO:;~;~;o!~;= ;;;;_-----==_ dard QWERTY layou t plus 5 wrry curser control and special func-

tion keys.. These v.ere originally made fo r the Adam computer by HIGH VOLTAGE H N LASER POWER SUPPLIESccteco. bu t should find thei r way into many home brew p roducts e eas well. It is a very att rac tive board which is fu lly enclosed. Powe r We have 2 d ifferent helium neon laser supplies which will -

=~ 1+5 VDC) and signals are input t hrough a co il cord wh ic h term ina tes run tu bes of up t o 2 mw. outp ut. T he 12 vde input model §= in a 6 con tact modular plug. AU new, with sc hematic. puts ou t ! Kv min. starting volt age, 1.25 Kv cont. dUty @ _=§

lihpg. Wt. 4 Lbs. KY BO 9 $ 20.00 each 6.5 ma. T he 115 vee input model puts out ! Kv min. starting vo ltage, 1,5 Kv cont. duty @l 6.5 ma. An ex t ernal tJ.I- =last is requ ired for either uni t. Both are high rel iabili ty,moi sture proof, H a led units. 12 v un it - J "x 1.5" 1( 1" .115 v unit 5" 11 2"1( 1" , New. Please call us for you r OEM _=§requirements. We can cu stom design to your spees.12 vde unit 60z, SP. l J2A $ 65.00115 vac un it 7oz. SP-133A $ 70.0 0 =

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TItO PA · ~ •• ,..., . 1'0' ,....O>U""9 .... . "Q"'"'.urn '0 '0 ' 000 M'" ' • ,,., 25 .n.~." •{IN<..­CO"ne<;'"'' • 9'''''' ' ur .M"nQ", • ,"'- ~,__ TV ,~..."",

$449 5 :.;~.",",-2. '

CT-90 9 DIGIT 600 MHzCOUNTER

-~- :--~~ d---

PR·2 COUNTER PREAMP

CT-90 • •,CN ' 0 ' PPM "'"~ "n.......,AP_. nrc"1 P<1< '

CT-I259 DIGIT 1.2 GHzCOUNTER

$1699 5 :'::::--

T... "'0>1 ......... 'or _ rr..., $.100 >""'U'ft J_ ..bOO ~.. ,,,' '''' • 9 dog ... . .,." ",<.ator.__.~v. '50 "'''' 'VP~"'"........ . '0 , ,_ lor WWV _llo"• 1 _ ~OCv

51499 5 ••~-'-AC_IO,

A heavy d uly and accurale SCO(>tl 'u' ser., ce.u ",e ll as pfO<lucloon "w. Fe" h" .,,; me l",),:• w,d e freq ue ncy band w".!t" • upt lmdlsen ·SOIo.'l y • extremely bllghr display · delayO'(lt"OOE",ng s~p • I>old o il • Al l '"99''' •""9'" sweep . TV sync ' SX nwgn d,cat ><:l<l• x YorX Yl OPef a t ,on ' l-lF .tlF _loere<Juct'on3500 Dual trace Oscilloscope

54999 5 ".<,"~•• 2"... "qu·"'Y~.""..

'99 .~1 ,9~

' IS,IS' M

­'U'.~"M

Ideal '0< !,,,Id ·ben<:h appl'CdhonS. It>1,~ope can d,splay u p 10 15 MH, s 'gn,,'SInt" ,nal battery pac. allow. "" tu 2hou rs operallon on a songle Glla'g..Featu ...s onclude • b " ,IH n ba l1e , ychar"", • 5. h""lonla! mayn ,r,c;ohon

'. • h Igh b"gnlness CRT ' Iron, panel"_ __ !race 'OTalor • mh'm al 'ecn"'9t'dble

, ..... ~tlery Pi'C "• ,. 2500 Portable Oscilloscope

• 44995 in<hod •• 2h,ghqu. "'. P'o....

MINI·100 FREQUENCY COUNTERr_........ _c-_ """".... C"O"""1 ' • .an """,h •Q)mpIo<I ' ....", ......, _ cu"''''', _ • _ • .ocCu' •

_"" ''''0""""''''\1 "'_ ' ...... '" _ ""'"'."90 ' do<><lo "'..-_ • 1<091"''1>10I.

5 9 9 95 BATT(~' CHAIIC;t ~ NICJt, O IAI HII'lSANO AC A(>AP TE" ' NClUOW

••

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35 MHz DUAL TRACE OSCILLOSCOPE

15 MHz DUAL TRACE PORTABLE OSCILLOSCOPE

•

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CI -IO ','llP·' n'C.~ """ .

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CT·5O 8 DIGIT 600 MHzCOUNTER

..;-/ CT-70 7 DIGIT 525 MHz.... COUNTER

RAMSEY 0-4100COMPACTDIGITALMUlTITESTER

-~A comc>I<1~ ""'" dK<>­de' ,,~ • "~Gle PC""'"," .u,..... .000­~(MM) HI .dIU"'bl~•__20 ....., pOO __-

'"-' ~1 OC ~I 'or 1OuCf>.I"". bu'" <10""" ''''' ' SK .'eCon ofl.<> be uSO<l OS ••to_ ,"""....'" ,."" Aun. <>n 5 10 , ~ ,.,."ComplOt. ' .I, TO-' $5.95_..... ,.,."... _ 0 • .-.;1 _ "".-d... ', ....' .. ,....."C 0 ' • porrc~

...... ~ W_ OUd«>-..o ......"" J'~ .,,,,, ..- l-.~ ""'"- -ec...- ." SU J 12toS..,.,,-­"""'~,' '' "oc "• .,"'~ " , . ~ ,, '"." """" "K'."., '" ... , .. ..'" ' .... .. ..

Save s30 on theRAMSEY 20MHzDual TraceOscilloscope

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Com pact S'~ed rehabohly and accuracyn "s LCD dog'r.j mull,lesle< eaSI ly lots ,nyour POCoe! . you can la oe " anywheren fealures lu ll OYe<load "'O'e<;I,on 0 3d'g" LCD readout 0 reeeseee ,nputjac.. 0 safely pr obe s . O'ode c hee'tu nCllon 0 2000 ho urs banery lite

5229 5 ...t lo. _...0 "" d d

Mad 8 1.oSl.... I<.i!

Color O'll"'"See musrc comea l,..,' 3 OIN """ItgtltS ftoc ,ttlmtJ5IC One I,gh'eaCh lor, h'!Oh _m,d-range aodlow~ Each In(l"..duafly a (ljuSl 'ableano dm~s UPto 300 W rurrs on

"""""Complete ..,Ml-l

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An '~ro'~"'~9 • •, .......1 m .~

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Comp'~1e , ., We-'$6.9~

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NEW RAMSEY1200 YOMMULTITESTER

....- --.•-Uosurpaued qua l'ty a , anuobealable P"ce. IheRamsey cscrnosccpe COm­pares to olhers c osl> nghund ,eds mO,e. f ealLHes

• ...clude a cOmpOluml lesl -• ,ng crrcull10r "'5,stor

capac,to<, dog'la l c"cu,1 a nd doQOe l""I'nI} 0 TV ~1080 sync I,ne< . .. ,de baod­.. odlh & h.gh SI!flM I ~,ly • ,nle<nal g,ahcu'" 0 'ronl paoeI I'ace ro,a ,O' 0 Z a ..so hogh senS,Irv"y . _y mode • regulated power wpply • bu,II"O cahbralOf 0

rOC . solod '''99'''",n9 53699 5 "'v.. ......'" - 0tIWas 5399.95 NOW ONLY ",ob.. ,,,,,ludod

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Check IranS,SlO'S. d,OGe'S and LEOs" .1l'I 11l,S Plotessoonal qUllI.ty me'erO tller fealu,,,, ,nd~. deC,bel scale 0

<'01<. vol' melM'nI}syslem • 3' • mor­ro red sca le . polarrly S.. 'fch 0 <'0melSu"og ,anges • salely probes .h'g h ,m pacI plasl,c caS<!

5199 5 I~" "ad• • ""NI'", "",Iu"",,,

MINI KITS-EASY TO ASSEMBLE, FUN TO USEBEGINNERS & PROS WILL HAVE A GREAT

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f ...._ .... u ~_ .... 10300"10..,. _,.-"'" ~ '"""'e _ on J to 9V T,I'" . .. "'- _ .............. . @ PfO'll"'l'--. ... ·' M $1.95 . ... ~ K " $.9'1

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_ 0_101"'_''''''''0' P''"'' __ "m ~9 .,,0 "" ...__ u,....!i!i!i '_OC_""'1.-,. 0''''90 '" 1'"'1> lor _

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.... m .o .". T' on.....,.. • ..­-'"' up '0 3001*'" " .Ih~.__......_,...-"'._"'000<"""" '. K, ooc...­........... __h__y ruct""", T""...... 1'........'''' ... ' , ..n.. J K " $" i!if "'-J "'''edO"O '.,,<Nj '•.9'1

30 Wan 2 mtr PWR AMPSor<>pIo e:-c _ """I' ,~'.. I'...... _ _ ' W... lor I ...., 2 w ... ""'~ I . w"''''''JO_, ... . "".....,ol JS W "'C _._~ ,..' h .. bO'" IOU~..... T_",......,.-, JO Wp'" ."'p • "

TA _" A' ...n>e<l T_R . 0f • • ., 1

Power Supply Kit~"""''''9U''_ ___..._ ' ''''1......... 200 .... _ '~ ar ' A"", ( . _ ,

_ '''9u''''"" go<><! "9 .........." SOl' e... rr.n.""' .....u".. 6 JV I.' .. · "" 569•~. VCT Comp'. 'e " ,. PS-JLT

.-PS-IOB 1.5GHz PRESCALERt._ ,he ,_ "'"...." ~ou""" ro, ""'" • 2 .._ ~,."", 1>, '000 ...e~'Y ' ' '- _ (5O"N " ....... . 11>«;. _""• • , c;'" '" , ....., ou' • , ,,_~ ,

c""n,..

PS 10-8 Prescaler

.....--.""-

" When You Buy. Say 73 " 73 for Radio Amateurs • February. 1986 79

-

AM HELPw. are IMppy to~ Ham H~p list ­

ingt f ..... on ••ptee-.wa 'I._ N a il . We.,. nor " appy ...".., _ 1M... to taU timefrom 0''''' dillies to d«ipher Cryp ticno /tIS 5c,. ..I«1 illegibly on dog_redpos te,mfs enrJ Odd·sizltd SCf l P S of ~pe'PIHU type ot print yoot , toque., ("..,ty'}._ _ spa'*', on all 8 'IJ ~ " II ~ ./>HI of

pep« . tKl u•• upper· .rH1Io......ca•• let­~ wMiw.~.,._ """ 0. tHe-d m•••

• M1M /00II 1,• • • -'. M"'" ." M" - ..fl leftcould be an ".,.. or . II ".~_ ri and so on.Ha,d lIS;r may be /0 bfI/le~. .... . " no' f.,mlli., with ....ry piKe 01t'qulpme,,/ man·IIfet; 'urMj on fert" lOt I". lUI 50 "(Nf . !

T"."". lOt J'OVf~.flOtl.

Help! I've been searctllng .......ryw/'lefe'OI I,,'ormafiOn on flOw ' 0 dOa " ' a s HK:a ,,"

mocllfication to my !COM IC02AT. Cananybody t>elp ....?

Mich... Gn ser KAlWPC7630 R.llz Rd.•144APe,.,..,.bu'll OH of3551

I a m IooIIlng tor a Ke nwood DG{i lllgila ldiaplay tor my T5-520SE.

Mik. _310 Hiska Rd. • 104

Downniew. On'arloM3N 253 Ca nad a

, wOtltd like ' 0 obtain a copy of lhe ' e­YIIw of ' he Realislic OX-400 shortwave.e­ce/W>f wIl iell appeared in the 198f Wot1dRadiO and TV Ha ndbClOk. , as we ll as a re­VIew of lhe ICOM R·70 wh icll appea red in

tile same Issue. Also, does anyone ha.-eifllonnat ion on broadw,ndlng the ICOMIC26O?

seen H lIfYIY

N. S011 Idaho Ad.Nawm,n lJIh WA lll102S

, woukllike to bonow a copy of the .....n­ual 01 the IoCl'\ematic lor a Clegg 22'ef1.4 .....1< 11. Has anyone c onve rted tlliS unit 10<

,",G~ Magarie WAWIL

33 e......sda.. ROlId

NaT icIl MA 0116ll

I need a T....7153-J' 14-9ln inlegra led eir­cuuee repair my rllClliver. I have been lo ldlhal lhis part Is used In many To s h lo a ret­evls lon sel s . Can anyone help me ?

H. Mamoll31180 7th St. HW

La'90 n 33S<Cll

Has a nyone c ome up with a Comma-

dOre 64 perIpheral tllat producet SSTY

g,aphics lind ted? AIIIO• • oeed ill ICI'>e­mat ic fo ' • Gonse! G·50 6m ';0. I willg ladly pay shipping a'ld copying costs.

K'n<llIth Johnson WA4TOP• Fal...1ttw om. North.......

Haines City Flo 33144

I wo uld like 10 gel in tcucn wilh anyonewh o uses a Timex 2000 or a Time x 2068mtcrocomccter to e .change Iden a ndprograms.

Ma_ oa....ao.kia SVUW

80. 23051-112

TO"'\hen$, G.-oo

I need a service man ua l or an opera ·nees manual lor a n Allied Communica·tions tl'IO<.teI A·2515 receiver. I'll pay .hip­ping a nd copying costa

WaRdell Titmus32115 HI,. ROlId

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10ISl .99$2.85S1.79

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G.l>Uf>d;roQ .trap, hea"Y duty tubular braid3116 in- linned copper 10C1h.3111 in. 1_ Coppef :JOcJh.

RG8U 2O!1 Pl ~9 ea endRG214U dCIs .lve l $hleld. 500hm

This Month15% OFF All ICOMNCN ELECTRONICS

436 Valley Ad., W e s t O rall'lB. N J . 07052

, I(20 1) 674-8148

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1

OEP·. eoa'''l Sa "BEl OEN 9913 3800JlOO " 39/t1 cut

No $pool, saves $hlpping charge sAM PHENO L ConneClor. & Adaptors

UG·210 N-lype Male cab~ end "'""UG-210 N-lyn Male cable end " "Pl·259 UH Plug solver plale '"UQ·l.w N plug '0 UHF IIC~ """""'" N IIC~ 10 UHF plug " "UQ.2Q'" N-type w..et conn ."• 'Spec.., fa lor eELOEN 9913 cable

COMPLETE STOCK. SAME D...... SHIPPINGOEP·. 201 ·8U·1133 ask fo. BIll

110-4 Roule 10 , E. Hanover , N.J . 01936

Q'de , s unde. $30.00 add $2 00

CO NNECTOR S MADE IN USAAmp he no <PI 259Pl·~ TefiOfl/S, I.....P l ·~9 push·on ..d ..ple' shellP l m & S-0239Doubl" U a le Con.-....;torPl ·2S8 Double Female Conne<;to.I 11 pa lch co'd ""RCA l ~ pe ph'\I$ eachendRed uc.. , UG ·175 o. 176UG 255<Pl·259 toB NC)EIIlO", 11,13591F59A lTV type )UG 2 10,U Amp he nOI Tvp.. N M,,'e 10' RGBBNC UG88C1U male).'16 ,nch M'_e Plull 100Colhn$ e tcUG273 BNC 10 Pl~

FREE CAT"'LOGCO D add S2.0Il_FLA. Ra• . add 5"4 Sales h.

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Connectors-shipping 10% add'l , 53.00 minimumCable-Shipping $3.00 per 100 ft .

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lOW LOSS FOAM DiElECTRICRG8X~.'. sh... ld ...... $14.951100 II. 0< l1eltl .RG!l9IU 10% Coppllf llra id."•." ...._.._...__.. ..9cII1.RG6U 80"4 $h>eld 11c111.RG58U 80% $Il"!'ld OTentRG58U % ''-' sl'l~ 10C11t.RG59LJ 100 '10 lOll Sh>eld. T... l~pe .. .lo.m.RGSU 97 '/0$h~ 11 03 lllQu" Belden 82141 31C1h .He avy DUI~ ROlo, Cable 2·16 oa. 6-18 ga 36c1ff.Ro la ' Cable a·co n 2 18 ga. 6·22 ga 19cJIt.

W1RlUSS REMOn CONTllOL IXnlotSlOM snnM

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Control your TVRO, VCR, or CABLETV from Any Room!

Works on most infra red contro lled devices .Immediote Shipping - W holesa le 8. Reto il

MERRIMAC

SATELLITEMERRIMAC. ~_WI 53581 __

", -. SlG..Al GE.. ER...TOR, 50 ~"Z TO 65 MI1Z., RFOlfTPUTO. l "'V TO 3V I" 50 OM "'S. CRYST"'L CAl~

6 RATOIl. ~1ooo HZ MODULAflCl'l WII.OU", -e SlG.....LGENERATOR, 10"'HZ TO 48QMI1Z., O TO

0-1 lotII TO 1V RF OUTPUT INTO 50 OMMS. "'WCWPulSE. OR «0"1000 HZ IoIODUL..ATION CAU IlRATED.UTE_TOIl . . . . PILIO

"" _ SIGHAt GENERATOR. 10 MHZ TO <20 MHZ ......CW 0IlPlL'lf. 0VTf'VT. 000'1000 HZ lotOIlUL.AlIONoevro 5V IlllO 50 OH MS. CAliBRATED"'TTENUATOIl . . . sa&.011

T$-$lOAJU SIGN"'l GE NER...lOR, 10 "'HZ 10 . 20 MHZ"' ILISPEC "' ll IT"'~ VERSIO N. SA"'E /oS HPllO!ID

~

""" .... SIG.....l G ENERATOR, 900 MHZ TO 2100 MI1Z., I"·TER"Al OR EXTERN"'l PUlU OR FM JoIOllUI.A.lION. 0.5 VV TO 1V INTO 50 OH MS. CAlIBRATED0VTf'VT . •• .. ~.

IW .,.... $lG/oIAI. GE ..ERATOR. 1.1 GHZ TO U GHZ 0. 'VV TO IV INTO 50 OHMS. CAlJBRATHI 0U1l'VT."ltRtol...!.. ExTHlloIAl PuLSE.. FM fIoIClOlI..AlION

~

"'-11111 SIGN"'L GENER...TOR 3.8 G"Z TO 7.11 GI1Z., O. I"'V TO IV IN10 50 OHMS, CAlI6R...TED OUTPUT, IN·TER.....t . EJrr'ER.....l PuLS E OR FM "'ODULATION

W~

SG-557 I\1RIlt-U S1G.....L GENERATOIl 11 Goa ro 1.' GHZ....1U$PfC "' IUl"'~ vERSION. s,o."'E /oS HPel811

~

"_ SlGHAl GE..(RA'!OR. 1 GHZ TO " GHZ. CAU-IlAAT"fD OUTPUT INTEIIHAL., EXl'ER L PulSE.F'" lolOClUL.ATlON IIoISO.OIl

ttl' 826A SlG N"'L GE..ERATOR, 10Goa TO I~ Goa INTER­.....t , EXTERN"'l. PULSE, SQUARE w...VE. F'" "'00­ULATION CAlIBR"'TEO OUTPUT. 10MW10 1 PW

" " " " .. " "" .. SMO-.ttl' t2U SIG"Al GE ..e ......TOR, 15 Goa TO 2' GI1Z., CALJ.

BRAYED OUTPUT 10 "'W TO I PW INTER.....!.. EX·T£RtoIAI., SQUO.R£WAVE, PUlSE. F... ltoOODULAlION

~

UfIIlt-2$ "'1U7"'~ $IGI'<.AI. GE "' ERATOI'. 10 KIiZ TO 50MHZ, IIF OUTPUT 0 MV10 2 VOlT! ANJCN «01000HZ MO DuLATION . $0 Otl '" S TOP "'TTEN U"'1OR.S MilU. PQIIT"'Bl.E UNIT .. _... . S24 .

URM·2e "' ll lT...RY SIGN"'l GE"ER...TOR, , "'HZ 10 00Il"' HZ. CALIBR...TED OIII PUT ...nEN IJATOR 0 MV TO 2VOLTS. "''''ION 000'1000 HZ "'OOUlATION. S... ...llPOR7...ll l E UNIT . . . . . • .....•• SN5.00

MAIICOtll" 1000 SlGNAl GENElllATOII I0 MHZ TO t70"'11Z., "'WI'''',CAUIlRATED OUTPUt'. INT£F!I<Al F...C. I .....0 5 lO1Z W!TH 1011 KHZ VAAIA8I.E DEVIA­lION. "'M lIoIOOUI..ATION OF , .....0 5 KHZ. CAU­6RATEOM0U7PUT OlO 2OD "'V ..... IMG-OD

HI' 52.~ FR EOU ENCY COUNT ER. ... E"'SURES FR E­QUE NCY. PE RIOD , R...nO ..... 0 MULTIPLE R...TIO"'U LT IPlE PlO RIOD "'VER"' GE. FR EQ. R"'NGE 0 TO 50"' HZ WITH HI"525311 f'lLHl-IN SUPPLIED. ExTE NDSRA..GE TO eco ... 11Z., SOliD ST...TE COJNTER

.••. U1$.0II

WE ACCf:1'T~ IIIC OIl CHECIL ADo S1M"1I111WE SHIP HIl w~.,WORI.OWIOE SAnsn.cTIO/II _ANT'EED. 1....EtU:TE SHI.... ENT. _ rrf OR I'I1O NE TO­tItoY. flILL ILEP J'M.S24-tilI-OUR :lOTH YEAR!

8 L.E ... E L ECT R O N IC ta ~W C O", ,~

U.$. "IGHW"'Y "',

OTTO. _Ttl CAAOU"'" .m

RE-CONDITIONED ANDLAB CAUBRATED

TEST EQUIPMENT

80 73 fo r Radio Amateurs • February. 1986

e..-lo lIo. Mnxo 522.91. I _ only. US r..ndo ....... on US b.nl<.I'omtn ",r&c. SJ9.91, I~ only, US fur>do dtO'*Tl on US t>.nk.I'orei.., oinnail, p1e_ ;nqIlit• . PIo_ allow 6-a ....,k. fot d<~"",,, _

FIRST WITH US, .111I11THEN THE WORLD!Better communications start with your subscription

to 79 for Radio Amateurs----------------------------------------------

YES' Start my no-risk subscription today and send me 12 issues• of 73 for $19.97. I'll save 33% off the newsstand price!

o CHECK/MO 0 Bill Me lI>l- ..... <hod ~oblo "" 1J1

Name _Address _

C ity State Zip _

'7!:>1M Rudio ~I ~Am..teurs M

PO Box 931, Farmingdale, NY 11737

-

ONTESTS CALENDARRobert Baker WB2GFE1S Windsor Dr.Atco NJ 08()()4

VERMONT aso PARTYStarts: 0001 UTe February 1Ends: 2400 UTe February 2

Sponsored by Ihe Central Vermont Am·ateu, Radio Club (W1BO). Each slallonmay be conl itCted once on eitCh bilnd ilnd

mode (CW. p4'K>ne. RlTY}. ON and RTTYconlacts must be in tl'>e ON and RTTY

subbands. Dupllca le and repeate, con­tacIt are In.alld.

EXCHANGE:

RS(T) and state, prl,Wince, ARRL coun­try, or t ....o-.eller designator ror VT cOlJnty(AD. a N. CA, CN. EX, FN. QI, LA , 00, OL,AU, WA. WM . WR).

EXCHANGE:

Signal tepOf1 and ARRL ~hon te<>unty

'0/ He Itations).

FREOUENCIES'

CW-3.52S. 3.m. 1.02!>. 1.12!>, 14.025.21.025.21.125. Pho ne-3,aOO,7 .29O,1'.290,21.275.

SCORiNG.

Count one poInl per p4'K>ne OSO; lWO

poonts per ON 050. NC slil1ion$ mulhplyby total NC counl ies worlled. NC mobilesmay add 500 poln lS to their score l or eachcounly outside thei r home counly in ....hkhthey mal<e 15 OSOS.

AWARDS;

Certillcates will be awarded 10 the h igh.est-scoring non-N C entry, higl'>esl·scorlngNC stationary efltry, and higl'>esl-sconng

NC mobile entry.

Feb 1_2Filb 1_2Feb 1-3............Feb 15-16

feb 22Feb 22-23

"a' 1-2... , t - 10"a. 1$_ 16"8.1 5-16Apr 12_13

... ..

... "

... '"May a

" Iy 17Jun 7-1J..... 21-29Jul 1Ju112_1 3

""ll 2-3AuQ 16-17s.p 13-14

North Cuollna QSO PI"yVtlnnO<lI OSO PIor1yN_ Ha mpahire OSO PIortyOulc:h .....00 Conl..t

Yl-lSSB OSO Plrty-"'-AARL Intam.lkM\ll l OX Conla.t-CWRTTY World Chmplonahip Co nln 'AI.bII.... 000 Parl y"Ai'lL Int.....t iorul l DX Contnt_Ptlone

Wbconsin 000 "'rt,Yl -lSSB QSO ""rty-CWBermuda Ama'au, Radio ConleslCARF Com_ wHlth "'- Conl..tARA L l U M H, SprkrtARRL :z2O.MHz Sprint"I'l l'll 432-IoI HI SprintARRL 1298-MHz SprlnlAARL 5O-MHz Sprint

"RRL VHF QSO p"rtyAARL AMd D.,CARF CJIn-.da Day Conl..t

IARU Radl...porI ChamplonahlpARRl UHF COtlI• • tN_ Jerwy OSO PIorty

AARL VHF OSO PIIrty

WINNERS OF THE 1985BERMUIllA AMATEUR RADIO CONTEST

RESULTS

ENTRIES:

Score 3 poinls 101 each lwo-way mem­ber conlacl on own cont rnent, 6 points It

d ill" refll continent. Nonmember cootectscoun l one point . Only member·slatloncontacts count rOl multiplief5. Mult ipl iera

are each US, VK, ZL ilnd VE st"l" 01 proor.ince . nd each OX counlry. AI!lO, eacl'l OX·WIK 01 YL.QM team cont;t<:ted, bul onlyonce lor eacn team . When OX·WH( pa,t·ners ccmect each othe, it counts as ,double mult iplier, 11 you. 10 t. I de inp<llpower is ZIO WallS 01 .... durrng the en­l i re aso Plarty. lhefl count an addrtion,,1power mUlllphe, or ' wooFinal Scare Is su m01OSO points times l he tOlal mulllplier.

Spec ial certif icates wrll be awa,ded tothe 0....01 11 win"",s 0 ' each category. Reg.

u la. ce<!iltea,es 101 OX country, US S'''l''.and Cilnadran PfO"In<:e winners

AWARDS:

SCORING'

f REOUENCIES:

On HF uHl ll>e USA General-clau bilndpotI,OfIS. On 20 melers be a....a'e 01 tl'>enets On 1• .313, 1• .336, et c, Slay away ',om14.332 : leave it open l o r OX memb erstrying to make conlacts, Check 80 and ~mel,,", on 1M houf. VHF and UHF use si ....pie. only.

NEWSLETIER OF THE MONTH

ENTRIES;

Send your efl l ry no la ter man March~,

t986, to Mount Moriah Repeater Anoela·lion. cia Bud Valcourt N1BYO, 19 TugueDrive, salem NH 03019. Include. largeSASE 101 a copy 01the res-ults.

YL·ISSB aso PARTY-PHONEStarts: 0001 UTe February 8Ends: 2359 UTe February 9

Tt>e OSO Plarty is 0f)IIn 1<;1 all btll empha·sis Is on memf)er Pilrt ic lpal lon and mem·ber·t o-member conIacts. Operating cal<>­gories Include: single oPeralor, OX·WIKpart..... ilnd YL.QM leam• . All US Gen­eral p4'K>ne bands will be used, VHF andUHF may be uaed but eu eeotecte must beeueet and not through ,epeal' lfs N..ts arenol allowed '

EXCHA NGE'

Signill leport , s l al"'province or cou nlry,name. ISSB number (II memf)er'j, and OX·WIK PiSrtner'a call. It flO PiSrt""', tuveblank. If nonmember. send ~no number.~

February', ilwa,c).winnrng ptlbl iCatiOn is tM Artzona Repeal'" AuocriltO 'I"SSqIWk/l Tal" edrted by Betty Karse< WA6H RX. TI'Ie T"i l is mechilniCally 0f'Ie ofthe best newslette~ we have seen In a long time. o r course, good looks a,en ·ttha only thing lhill the Squelch T(li! has go ing for it ' Betty snd her staU fill its

pages wllh interesling news clips and featu,e art iCles. drawing I rom sourcesauch a.s w.$I//,, ~ and I". ARRl l#tf""

To enter your club's newslener ;n n . N_slen", of I I'>e Month Contest. sendit to 73 M" gazine, Editor ial Ofl ices, 80 Pine St'eet. F'9terborough NH 03458, Ann:Ne....s leUer at th.. Month ,

minimum 01 5 OSOs In e<ach NH counly,

ARRL IleCtion, and oxeceoYntry. Plaque10 tr.. higheSt 5COnIf in NH courlesy 01ConcOrd 8,asspoundefS. A Wor1<ed All NHAward , sponsored by W1JB, ....11I go to pat ­I lc ipants ....ho wor!< a ll 10 NH counties.

137,750

".,ro137,020117.480

1,31• .135

AWAROS:

Cer!l l i<;alllS to highesl scor", with a

Ma il logs by Ma rch t , 1986, 10: NorthCai'olina OSO Pilrty. cJO K4EG, PO Box

3ClI>4 . Burlington NC 2n15.

NEW HAMPSHIREaso PARTY

1900 UTe February 1to 0700 UTe February 2

1400 UTe February 2to 0200 UTe February 3

SpotlSOled by tl'>e NH Amateur RadIOAssoc i.l ion. St. l ions may be wOfk edonce per band and mode. NH stations maywork each o l he,.

SCORING:

NH IIlatiOl'lll !lCOfe 1 point per OSO, mul·

tiplled by lhe su m <;II NH countres, ARRLsec tions, and oxec countries worked (e.·cluding NH, US, Canada. and oxec ecce­I ries with in ARRL seclionS!. Others score5 poinl. per NH OSO l imes I"" numbef 01NH countoea worked (10 ma. imum). tn a<S­d illon, aU stOll ions coun l 20 bOnus pointseach tor work ing the 'o llowlng NHARAmember ClUb stallOf\S; N1BYO, WB1CAG,WB1FFl, KB1KJ, W1OC. K1RO, W1WOM.

"nd K' UNJ lor a fI'l/f.,mulfl 01 160 bonuspoints.

f REOUENCI ES:

Phone-l .815, 3 .97S, 7.235, 14.280 ,

21 .380,28.580,50.115, U4.205. CW­1 810, 3,~, 7.OSS, 14,OSS, 21.OSS. 28.055.Nov lce _ 3,73O, T.13O. 21,130, 28. t3O.

EXCHANGE;

Send RS(T) and ARRL sectlOfl1counlfY01 NH county as approprh.te.

orazG4BWB

"" "VEt NGVpgHK

West GermanyUni led Kingdom

Uni led Slalesc._"""'."

NORTH CAROLINAaso PARTY

Sta rts : 1400 UTe February 1Ends: 0500 UTe Februa ry 2

Tl>e North Carolrne OSO Pilrty ;s lipan·

sored by t l'>e Alamance ARC. Wort< sta·lions once per band and mode JCW andphone). Work mObiles as l h ey c h angecounloea.

EN TRIES;

S<lnd SASE 10 ' oUic lal log and scoresheets. send logslfKsim iles, name, c las.aof license, and addrf!'5S_not lal er tnanMal cn 1, 1988, to; O. Loverin WA1PON, 50

Liberty Streel , Mon tpelle, VT 05602. In·clude an SASE lor a copy or the ,esults,

AWARDS

FoI tIOfl-VT stations, certihca te to hiOh­

esl '!ICOflng sl ation in each state, province,and country. Ceflrhcatea will be given 10eacn VT stallon submitting a log. A plaquewill go 10 lhe h lghest-sco ' ing VT sl at lon,WNT Award given 10 sl ations wOlk ing 1301 VfIn'I'IOf1U 1. counlies.

SCORING,

see-e one poinl per p4'K>ne cootect. 5poi nts per CW 01 RTTY ccetect. VT sl a·l ions m ulhpty OSO points by lIlJm of VT

counties, s tates, Canadian provinces. andA RRL countlles (..etcee USICanad illOthers mulliply aso polnl s by Ihe number01 VT count_ 11. ma.imum~ Add 20 be­OlJS points l or working Wl BO.

fREOUENCIES:

Phone- 3.9 t O, T.23O. 14.260 , t 4 ,320.21.360, 28.570, 50.110,144,2. CW-3,5o«l,3.720, 7.040, 7.120. 14.040, 21.040, 2 1.1~.

28 ,0<'0. RTTY-3,620 and 90 kHz h om

lower edge 01 ot twl< RTTY subbands

82 73 fo r Radio Amateurs . February, 1986

EGE Has Reduced Prices

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~.~--~... . , ..-_.....-. _. .

-

-_.­'ilL .

~.._-

KENWOOD

' ! SY1OTI '""f ~ ~ .'-'f1!.S

---

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.. .-. .. .-

----._----

IDIC OM..._ .. _..

"'-1'"-. " ~

~-, ... ..

. . .

".

RADIO".C~AGE

$nO.'$

n· ,"._,_.... -,

• •

--

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f ... _ .,." 0.00" c._ r"" F__»t-<IrH......- --'......__.,,-

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.• ..... $..."'"..........,-~.

------__eO....."....,

•

:!m!lII!!l S .'. T: II" , IlIIh"='=-. now -"e m n, at

Call Toll Free for Orders & Quotes: 800-336·4799In Virginia: 800-572-4201

73 for Radio Amateurs · February, 1986 83

EN TRIES:

Logs must $hOw ,,$Usl conlacllnlo plu.Isse nUf'l'>De<S al'ld anlS. Ma il entries be­

tote April 30. 1986, to Bill Early WA9AEA.PO Bo~ .al, Mc HenryIL~Ol.

DUTCH PACe CONTESTStarts: 1200 UTe February 8Ends: 1200 UTe February 9

Use all bands, 160 through 10 mete...CW and sse. No crossmode opera tionsar••llowed arK! please use the band sec­l iolls lICCOtd,ng to the IARU recomme<l­

dalions . Each Itallon~y be wo<l<ed onlyonce per band ,ellardlesa 01 mode_ Opol"ating cat"llQ<ies Include single operalor,

multl-oper.,tor. lind SWL

EXCHANGE:

RS(Tl plus sequential OSO serial num·ber starting ...ith 001. Dutch 5t.Hons willsend tlleir lwo-leller lI'ovince llbbfevi.tion;nste ild 01 ., asa number: GR. F:\ OR, (N.

GO. UT. YP. NH.lH.lL Ne . and leo

SCORING,

EilCh000 ...ith "". PB. or PI counts OMpain!. Multiply asa paints ~ tile numbe<01 ,HOy lnCeS worked on e.ch b.nd(6 ~ 12.72 maximum). SWLs coun t onepoint per Dutch etencn heerd and muiliplyby p'Q\llnces he.rd on e.ch band (72 I'll• • '

irnUlTlI.

ENTRIES '

Ae u.uel, a score celc ula llon Is reoQUi'll'd. P1&lIse use. muilipliercolumn.,ndi~ mult'pl~ only il they .re new Alog must be Signed lor ot>sen<-etKln 01 llIecontest rules. SWl logs must containe(Kl1J groups g iven by Ihe DutCh s t. lion.nd llle fo<e lg n st.llon worked , Send logs~ I.lar than M. rch 31. 1986. 10 : F. Th.

"When You Buy. Sa y 73"

aosthoek PA0INA, PO eo. 499, <1600 ALBergen OIl zoom, Net llert.nd e.

A eerllfiC.te will be . ...rded 10 eachcountry ..i~ in each category .Iorlgwith the second- and thlrd-pl_ st.,tKlns.p'Q\lidll'd there is suffiCient pert ic lp. lIonIn that country. ce-uueetes ... 111 erec go towinne'll In each call d latricl of JA, W , PV,1IA9II, VENa. VI(, W, zt, and lS.

AAAL INTEANATIONALOX CONTEST

CWStarts: 0000 UTC February 15Ends: 2400 UTC February 16

PhoneStarts: 0000 UTC March 1Ends: 2400 UTC March 2

The lln nual ox con test 10< .,11 ox hu nt­e'llis sponsored by th e ARAl .nd open to.,11 .,m.,teurs Worldwide. WNE .......teufll.,re to work ae m.,ny _ teur SllllKln' in.,s mllny oxec counlrles IS possible on1,6 to 30 MHz, excludl~ th e to-MHz band.FOlelliln amateu'll are to ...0 11< as men y WIVE st.,lions in IS m.ny 5t.t....nd PfO\"inces .. ponible. Check J.nu.ry, 1986,OST lor .,ny IUI-<ninult rule Ch.roges. Op­

"'.Iing categories Include:(A) Sing le opera to r-one pe'son per·

fo rms . 1I oper.tlng.nd Ioglillng lunctlons.Spoil... nets .,re not "Iowll'd and only OM"ansmllled signal may be used a l anygiven time. Wit h in Ihe s ingle·ope'eto,ca t&Qory participants ma y com pete within.,lIband or single-blind cat&QOrle5 as we ll.S ingie-band enCr.,nls who make COI'ltacllon o lhoer barwh shOuld SUbmil logl lorclleCking pu rpot.a-S.

(BI Mult l-opera tor- morlJ th.n One pel'son ope''''''.checkl lor du plicates, logs,e le. Wilhin Ih lS category enll.,nlS may

compele ...Ithin single ·t ran,ml tter. Iwo­Ira nl m ltte r, 0< unllml led-t,.ns mltter e . le­goOes. Single t••nsmiller Implies only onellansmittlKl algnal al any given lime .tIdonce station has begun opeIatlon on agi....,n b.,nd . It m USI re main on th.,t bandfor a t least to minutes. listening limeCQlJnll., opeI.ling time. MUlli-oP .Ingl....trensmi ltef st.tlon. must kIM!'P a ,ingle.chronological log lor lhe entire COI'l IHI

""'''''T"'O-Irans miller mUlll-op e ntrants a reIImi lll'd 10 only two tr.,nsmiUed signals atany g iven lime. AIlilIn, e ilCh st.,tKln must'IllY on II given band lor., minim um o f 10minutel. Both transmltle.. may wort< .,nyand a ll sta llons; the second Irana mlttlJr IInol Iimil ll'd to only worI< lng new mult;'pliers, Each 0' tile tr.nsmlllera must kMf)a sepIIlate log.

Willi an untimltll'd number 01 t,.,nsm"·ters 10< mu lll-op e nt r.nl s , onl y one I,.n l ·ml llll'd signal pet band IS pemlittlKl .t .nygiven lime. Sepalate. Chronological logsmust be kepi lot each band,

(C) OAP-10 w., ns inpul or less (or 5Wll ltS o ulput o r le n ). sing le opere to r, all·band only.

Each opfi.lor must 00....... llIe limit.lions 01 his IlcenH at a ll limes- You, cal;',ign must Indlc., le yo ur OXCC-counlry, t. 1I0n loe .lIon. One o per. lor m.,y noluH more lh a n onec.llslgn from .,ny g ive nIocaIKln d uring IIIe COI'llesl petlod. Theume ItlltKln may be work ll'd only oncepet band; no cro&smo<le. c'os'bilnd. orr.pe. ter conl.els. Ae ronaut lc . l- a nd m.d·IlmtHI'IOIlila SI a tlOns outeioe the US .ndcanada m.y nol be ...ort<lKl 10< asa ormult.plier c recl lts ~ WIVE statKlns. AllIrlln,mi tle'l and re<;eive<s musl be 10­ca tll'd wllh ln a 5llO-me1",r-<!l.m"'ler c irc le .,"clud lng direc tly connec led an tennas.Thll prohibltl the UH 01 remote recelvlng

in,t.,lI11llon,. Ho ...ever, muf\I-operslo< Sla·lion' m.,y use spoiling net, lor muillplierh unt ing only.

EXCHANG E:

WIVE st a tions Hnd RS(T} a nd stll'e orprov inc e . OX I la Uolls sand AS(T) andpo_ ill lhree--d lg it number appro.I....' ­ing transmitted inpu l pawer.

SCORING:

AI' st ati o ns counl 3 points pel" . a lldOSO. WNEs mull iply aso paints by sum01 oxcc counlries (except US and Can­ildal WOfkll'd pet band, DX ' tatlons multi­ply OSO poi nts by number 01 US , l.,tes(e.upt KH6IK l 7) and Olslrict o f Columllil(OCl, VE1 . 7. va. .,nd VE6/VYl ...ort<ll'd pelband (5ll maximum pet blind}.

AWARDS:

PI.q ues . ...s rdecl 10 lOP WIVE ecce... inellCh e ntry utegory. lap scorer In Ihe Ii"..g,-,.Ior .,lIband u tl9Of)' wor\OwiOe.,nd on each COI'llinent, worId..ide te.llersIn Ihe single-Qpera to< 'Ingle-band, ORP,mulli-op slngle· ll.nlm,tter, multl-op Iwo­t'an,mltter, .,1Id multi-op unllmltll'd C.".gorIes. plUI ..:Iditionlllipeci•• plaQues a ,sponsored.

Certi ficates ..ill be . warded 10 lap sin­gle·op..elo, allband entries from e.,c"counl ry and AARl section ; top lingle·band enlries In each US c.ll.re••fld.ilChcounlry; top multi-openlries in each coun­try. US c.,1I .".,.. a nd In canedll . Add i­tlon .,1 lingle-band .nd m ulll·op c llrtlll·c.,te, will be . w.,rded it ,ignl llc.nl e \fOllor competition Is di,pl.,yed. AlSO. OX en­trants ....king more th.lln 50ll 0S0s on a;.ther mode will recei.... ceflihca'es. ARAl ·aWh a led c lullS .1'0 compele 10< g.vels onmree Illvels: unlimited, medium, a nd loealclubs.

-

DA2CH

QSL OF THE MONTHTo enter your OSL, mail It in an errveIope 10 13,80 Pine Street, Peterborough NH lXW!i8.

Attn: OSL 01tile Month. Winners recei¥e a one-yNr subaCripiion (or e.tenslonlto 13. Enllie!lnoIln .,.,I . f;&I1f'lOI be accepled.

EXCHANGE:

Signal repot1.nd OTH (f;ounty 10< A'.,bamII statoons; state.11'000 ioee.0<<:oontrytor~,

AWARDS:

Trophies will be awarded to the top oul-ol·s taleSIal ion. lopAlabama I;.edIportable11'­l ion. and the l op Alabama mofliltt statIOf'.Cefhhcatea wilt be a..ardell to tM topllCOferfrom each state, province. country, and AI.bama county.cert if icates will also be issuedfor top Novice and Technician scores in and

outolA~

f REOUENCIES

CW-1.810. 3.!!>50. 1.050. U .05O, 21.050.28.050.1'!lone-3JlOO, 1.260. 1..:100. 21,360.28.600.50.110. 1•• ,20. 1"6.52. Novice - tOkHZup from the low end.

EN TRIES'

Mall entr ies byMarch lS, 1966. toBiIl Levey

WA.FAT. 3629Datlney Drive. BItrTlingham AL

352U IncluOe an SASE tor feSlJlts.

SASE 10 the contest address l or 011'<:111lorm s, All ent ries must be postmarked noI.ler than Man=h 22. 1986,~ ,.,1 to RTTYWorld ~;P.<:JO r""RTTY~.

l1!i5 Artletl Dfivoe, Encinitas CA9202.Of)efaling in eecess 011&\181 powe<,manip­

ulating scores o<limes. or tanuee lo omi! d....plicate contac ts which wo uld 'educe Ifill_al. SCOffI mote thaon 2% _ "I IIft'U"lds!of irrvned<ate d'lIQuallliulion DeeisionS 01the contest commiltee are tinal.

SCORING.-

CQunl2points perphonl105O.3painlSperCW 050. Alaooma stations mUltIpl y by 101;111stales. prov inces. Alabllma counties. andf;ountries. All otllers multiply by total AI. ·b.m. f;oun liesl81 m••imuml. M ull ipl yaoor8Sby 1.510< 200 Wil tts 0< Ies$ and mult~

ply by 1.510<noncommercial power (mobilese_cluded I'om noncommerci al mullipl ler).MOOles add 500bonus paints 'o<each coun­ty from ""'ich 10OffTlOre OSO$ aremade.

ALABAMA aso PARTYStarts: 1600 UTe February 22Ends: 2300 UTe February 23

Spon!l()fed by tne Birmi" gham AmaleurRadioClull.Wort< slationsonc:e perll;llnd andmode. Wort< mobiles and porl_ aga.n asthey changecoonl __

AWARDS:

Contest awards wilille issued in each en­try category end ope<atorclass In eacn01lheUS call distr icts, Canadian 1I'000ncesllerrtlG­ries. as well as in e;IICh OX f;ountry repre­sented. Other awar<.ts may De issued at tiledlscret ,on 01 tile awards o;ornmittee, A mini·mum 01 25 OSOs must be W()(ked to be ellg l.ble torawards.

Sta llons w itn"" the.8 con linen'.1 USstates and canada must transmit AST. andstate. provlncelterrlt ory. All others mustt.ansmil AST and consecutive contact nom-

"".

RTTY WORLD CHAMPIONSHIP0001>-2400 UTe February 22

sponsored by Til" RTTY Journal and 73Magazlne_The same stat ion may be wOfl<ed

once on eacl'l Dand. Ctossmode contacts donot count. Single JPlI'lotOt slalions may "'011<'6~ma>: lmum, .......,Ie mullklperlllor!lt.lions may opIIfate ,he ent ire 2~, period.Off times are no leliS than J() mlnutu eacnal'ld muSI be noted in YOU' Iogls).

Oper;llto< f;!asses .... l;llj tingle QPefato<,tingle 1•• n.Tlm.....and (bI mutti<JpBr.to<, tin­gle tran!ll'Tlitt.... Entrycategorie's are(a)singleband.and (b) allband. 10-BOmeters,

EXCHANGE:

SCORING;

SOSO points tor contacts with WNE st.tions located w,thin !he continen\;lll US and

CanIda. 10050 painls 'o<,,1 othefconlac1s.1mulhphe. painl wil i lle ;IIwal'Oold 10< eaen 01the 018 cont;".,ntal US states (a DlSlr ict 01Co­

lumb4. l:Otlt;IICt may be lIIlDstl tuted '0< • Sl. te01Maryland mulliplief1. Car\ildian prov;ncesIterrt\Ofioe$.;IInd OX countries *OfI<ed on eaenband (e_eluding US . nd Canada~ ToI &I 050poinfs times lotal multlplillr$equa lSClaimedscore

Entr ies m ust include a sepa..le log !mNch band.a dupe sheet. a summary sheet. amultiplier dlecJ<list. and a I,sl 01 eqUIpment

used. ConleSlants are as~ed to ,..,nd an

EN1RIES:

ru les. Iic ensinll 8uthoril~, elc., and the de­c isions of the ARRL Awards Commitle<lare I ina i. Usual ARRl dlsqualiltcationrules apply. Address entrieS.no lorms ..quests to ARRL Headq"arten>, m Mainstreet. Newington CT 06111.

snsets). All ope,al ors 01mull i-op steucnem ust be tisl ed

Entrie$ must Ile postmarl<ed within 30days Ol lhe lasl c:ootest weel<snd. Olher·wise I lley witt Ile f;lanihed as cl>ec~ logs;

no " . te"sions. no e.cap tions. All st.tionsars requesled to send lhei, ent,les In asearty as possillle. Each " ntrant ag.ees to

Ile bound by tile prO\'lsions o ' ttle ARRL

EN1RrES,

All enlrant s are encouraged to uSe 011I·er•• larms available I rom ttle ARRL 10 re­po<! contesl rellllils. logs must inclicatelimes in UTC. bandS, caliS, and o;ornpletee.changes. Mult ipliers sllOUkl Ile clea,tyma,~ed In l he log the l ifSt t ime worl<edE" tr _ .. ith more l han 500 0S0a lola lmust include f;rosa-chec~ SIleets (dupe

COMPUTER PROGRAMSI

RADIO SYSTEM DESIGNCALCULATIONS & RADIO

INTERFERENCE ANALYSISFOR YOUR:

IBM PC-C64-APPLE IIR.S. Mdl. 3/4 , II & COCO.

Both are in an easy to use menu drivenformal and have practiCal as well as tu­torial value. See review in Jan. B6 Issue01 73 Prices from $35. to $45.00.

~HORSE SENSE SOFTWARE

P.O. BOX 214GARDINER, MT 59030

Plus ShiPp'ngmade In U.S.A.90 day limited warranty

C.O.D. S2

See through keypad window and instantaccess to all switches Iront, top, backplus unique zippered battery door. Fitswith or w /o ICOM clip, Looks. feels andf it s great. Black or burgundy tailoredvinyl. Call (6 17) 599-3090.

C rowley MIg . Co. 95 Feder.1 St. Lynn MA Ol905

84 73 for Radio Amateurs • February. 1986

NOW - AX.25 VERSION 2for ANY computer, thePacket Communicator II

Can you imagine a TNC that has abuilt-in HF modem and tuning aid,AX.25 version 2 protocol, multipleconnects, and both TTL/RS-232 levelsat the computer port? Well, it's here!Introducing the Kantronics PacketCommunicator II, KPC-2 for short.

KPC-2 is the only TNC you will need,even if you change computers. KPC-2interfaces with ANY computer that has aserial RS-232 or TTL (C-64/VIC-20)port. The generic command structure,similar to KPC-1 but enhanced, fits anycomputer, even the PC compatibles.

In addition, KPC-2 features totallynew hardware and software - KPC-2 is

Suggested Retail $219.00

not a clone. And , of course, KPC-2 isenclosed in the now industry standardKantronics extruded aluminum case.For more information contactKantronics or a Kantronics dealer.

Want more information on Packet?Contact us about our new PACKETVIDEO, great for a ciub program orinstruction. $22.50, VHS or BETAformat.

lit!! Kantronics1202 E. zsro Street (913) 842-7745

Lawrence, Kansas 66046

MICRO CONTROL SPECIALTIESDivision of Kendecom Inc.

23 Elm Park, Groveland, MA 01834 (617) 372-3442

No other repeaters or controllers matchMark 4 in capability and features . That'swhy Mark 4 is the performance leader atamateur and commercial repeater sitesaround the world. Only Mark 4 gives youMessage Masterrv real speech • voicereadout of received signal strength,deviation, and frequency error • 4­channel receiver voting • clock timeannouncements and function control. 7­helical filter receiver. extensive phonepatch functions. Unlike others, Mark 4even includes power supply and ahandsome cabinet .

Call or write for specifications on therepeater, controller, and receiver winners.

The only repeaters and controllerswith REAL SPEECH!

Create messages just by talking. Speak any phrases orwords in any languages or dialect and your own voiceis stored instantly in solid-state memory. Perfect foremergency warnings, club news bulletins. and DXalerts. Create unique ID and tail messages, and theultimate in a real speech user mailbox - only with aMark 4.

" When You Buy, Say 73" 73 for Radio Amateurs. February,1986 85

ATTENTION

Foreign Computer StoreslMagazine Dealers

You have a large technicalaudience that speaks Englishand is in need of the kind of ml­crocomputer information thatCW/Peterborough provides.

Provide your audience withthe magazine they need andmake money at the same time.For details on selling inCider,80 M.icro, Run , HOT CoCo..nd AmigaWorld , contact:

U's easy. The new TEN-TEe Model 2510 simplifies station assembly. reduces thenumber of interconnections, and makes operating easier.

It's low cost. Eliminates buying separate converters and another HF rig.II's rull duplex. The 25 10 is a 435 MHz, H)·watt SS B/CW trans mitter and a 2·10-10

meter receive converter all in one package 10 give you full duplex t ransmit/receivefunctions in Mode B. It converts your HF station into an OSCAR station!

Exdusil'e single knob tuning. Provides tranceive-type operation.Just add antennas, rotators, and go. The 2510 transmitter section has a frequency

range of 435 to 435.5 MHz (up to 437 MHz with o ptional board), adjustable ALe.and full controls. Main Tuning sets uplink frequency. Spot Control helps find yourdownlink signal. Drive Control, Microphone Gain, Band Switch, and Push-Bu ttonswitches complete the front panel. Push-Button switches are: DUPLEX/M UTE(for dup lex. operation o r for disabling receive converte r during transmit); CW/SS Bselects mode; USB/LSB selects side band. The receive converte r frequency cover­age is 144 to 146 MHz (converted to 28 to 30 MHz) with dynamic range of85 dBtypica l. Rear panel connectors are provided for antennas. amplifiers, key, 12Vdcinput , and HF receiver.

Enjoy the most exetttng event in

Amlteur radio loday - with the new ,r;ilrTEN-TEC Satellite Station . See your •dealer 0' write for information to TEN-TEC, Inc. Sevierville, TN 37862.

SANDRA JOSEPHWORLD WIDE MEDIA

386 PARKAVE.,SOQTHNEW YORK, NY 10016PHONE (212) 686-1520

TELEX-620430

, ­~ -'# ,..

r---~ ~--- ..I Rush me my copy of the Dick Smith I

Catalog, I enclose $1 to cover shipping

I Nome II Address· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·1

If 'Icily . .. . ..... . II ZIPDl~~·~I~ ~;~~~~I~~ ;~~,""" II e.o. Bo. 2249. Redwood Cirv CI" 94063 I

Custom Systems Custom Programming

BILL ASHBY_ANDSON~

K2TKN-KA20EG 201·658-3087BOX 332 PLUCKEMIN N.J. 07978

PAC/N ET SYSTEM $240.00Sys tem Tested 4.5 x 6" board complete

with all IC s and programmed EPROMsperson alized for each purchaser. Re­qui res only sing le 8·10 volt 'h amp power.1 year gua rant ee of nardware.sc tt.ware/AX .25 standard RS232 serial ASCIIat any user baud rate.RS232 HDl C tor 202modem used for AFSK or di rect to AFequipment for FSK.

Ir EN-TEC Satellite~tation.

New

PAC/NET board only $80.00AssembledfTesleci NoICs.90day warrantyPackage of all ICs except 2·2716EPROMs $80.00

Q

\1;1~ i CASCII-USAJAX.25HOlC CONVERTER

USAiAX.25 is the AMAAD approved digitalformal STANDARD used on amateur pack­et radio networks.

86 73 for Radio Amateurs . February, 1986

Kantronics UTU-XTNOW - for ANY computer,

the intelligent terminal unitthat can change its spots.

Can you imagine a terminal unit (TU)that has user program mableparameters? Would you like to be ableto vary the MARK and SPACE tones youuse by computer control, save theseparameters for next time, and be able tochange the center frequency andbandwidth of the CW detector? All th iscan be done with the Universal TerminalUnlt-XT by Kantronics.

Imagine a CW/RTTY/ASCII/AMTORmachine that operates with a TNC- li kecommand structu re, including 54commands. The UTU-XT does just thatwith a 6303 microcomputer, 2K of RAM,NOVRAM, and 128K of EPROMembedded inside.

~---- -- .

UTU-XT is also compatible to anycomputer with an RS232 or TTL (C-64)serial port - the circuit is bui lt in . Thisallows you the flexib ility to changecomputers at any time.

UTU-XT operates CW from 6-99WPM, RTTY from 45 to 300 baud. ASCIIfrom 110 to 300 baud, and AMTORmodes A, S, and L. Selective RTTY andSELFEC are included.Suggested retail $359.95

Ell Kantronics1202 E 23rd Street 19131842-7745

Lawrence Kansas 660<16

'.SC37.·0 1.POI fIop-FIOI> No<V' n.'.SC533-1..n_.-- la'tfll""a".o'.~·OTypao Foo- FIOl> _ .oa~ e.-</t_ On.- In.a~'·O<:'Ial e.-<I t_ 0..- '''111' . sce.6J-T_ l al<:lll_,.~ O Typao Foo-flo» "'_' . SC51 J -T",n_,.", late/L Non/ I" ., .SC5a,o Typao Fhp-Fioo """""n.D.al. _ F", AllA~ ." 2 soC~ IV Mi<;to-Conlrol.., Kil- '129.50• • U H L 8-60. 'oIhO"Ol)fO:ft8O"' ..... r "'.S607J,• Conlt'" Buoc " 1"-" 0n-C"'lI. ........... $0..., Ol>e<.''''''""_-On• Fast 16- EId M.....,pIy And 00_• RS-2J2. SuPQOfls CRY I sen.. L,n•• 2a 81·00""',,''''''1/0 t.naa 18 25 5 ""• RAM "'. m"..,.. 2 K [._!lIe To '60(• £ _ Memory E.pa_ To ' ~ K·_ ,n~pr""" ""'9'...........• Pall ,cen,,,.n' j PM'.. _aoa• 0cII__. _ CI<>cI< W """,,,uo

UHF-TV PREA.plAs INI""'" In R..:IoO ( 1fM:" ""Q t,!a 'c"lt,lay a'hcIM. 19821""" _ 'pen_ an'..""" m(t<jnlao_'....., Un _ morer_15 "S ol~ 10,...... . ...... lor' ot ""........ C".-._ _ ,or-. /ollfttl llogl'l~ . " ........,,, _. all compoo .... " pans. PC8 D. Case. 1>0_ SI4JP/Y."., Qalun u a 50Assembled V....""" '5 1 50

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P.y TV Ii. ' ''ataU-bOnK'' _ 0..,Aa L.- AaS2.l15 ' SJ.~5h_ _ un."", 0(,,, COf'la ,n 5 ~ Conn"",,,,, 100 1(' hQI-l '-l Balun. 3OOOH"l T.'....""'!Ilo<. 2 F''5 QI-l "l Pol'" Gon:12 F'300 QI-l "l 1ton leadN.,.".. ca_ 1..... And U...~ ",,,..n,,,,_ '.'2"S2 . ~5 1~ ,,"I()I, .... _ Po.lS 25 Fee ' Coaa~ e- A....._ '''9_,-". For ,_ W" "c---..In,'-''''''_ .all8O-&2 .9 5 Incl udeS ..... ()1'IIe _ Plus 15 f ee l eo.a" al Cot><" AnoAU rae',• • b Pa"<la llle Pol . IU-Bolt f '"~..y 1_ln"a"a''''''_ .4M~&3 9 5 "",:I"C.,. "',, ()I1.... _ _ 6'> feel Co&&~ e.-A"".....~.. U- Boil " . '_""

20Cent(.20) 74SCXXSeries Special• 0CIal I_ aoa Clfao~• E......._ TD 74L.S.U; _;::.._.L.-_I$O-C_ho::..........._Pl; 9 _,_y. ,...... D. ad M_ ........• IlI9h C" .....t, Sl nlllSoul'c. C_ ' ....7a SCI3' -1 01 8 l..--le<l Dacode', l.ICl>e<17a SCI 38· 1 018 In...fle<I Dace. ' .llaSCI J9·1 ()I . In"""'.... DacocIftf7. SQOJ 7·1 01 8 Non- ln...-led. l.'Cl>e<I7.SQ03lII ·' ()I11 __.o7.S(;239-' OI a __ad,.SQO~_Il._~._

' .SQ041-(l<taI _Il._~-N/I

74SC244 0<." -"'l'''' o..--N/IaSQOa~o<"" Bu. f ....sca,_-_ I14SU1J· f ,a n_ ' . nl l a ten ·No<V l""

MICROART

151'1.. _1_.... ' 'eO\ilwt MTIPC •1~c.r- ..... _. _... 51100

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). 3l».JF )!,V ,....... , Yo 7 .. • ~"'" , . . .. 21' IIl5Coolr. FDI _ Eleoc". F_ .. '""'oJeC' . Tollo "$ T-1. ' ·2 , l ·T (12""1.. L-2 I_Ol 1 .. H) Comp.... set Of '"• Coil• . . , ... . . ,. __ ... , •.. .. . . . ..... ,8.SO0,0(;1 J.JIO- Pnme ( I<lQlOl 2J 1 00lIl'Q-es 1'........... 1sol)o!;ee- 001'" 2<111001"1:).",-,Nall .)1100.700./1 ~VI_'" :11100.roo.r'6V .... ,.~ ~'OOI N:J904 10,01 002 N3906 101100l N9 14 10/ 100l N41 48 __ . . 1 01/ 1 00' N523,e (Sl VZ_~ !JI'100__~,"(_T().l<'01 ,_.1811,782• .1_.1912- ..... .." __ .)11 00.-:.oo-.nr.. r Q- l 1OPkQ 2<11100__~1 1 6O'io """"" lola,~po•.;r_Neo&A4usI 15/'00r8 l06 VOII_ Ae9I D... , O&. ' 0- 9 2. 201100P>l2 222" 2OJ! 002 N30SS _ . _ so2N50308 :I'lI," 0015 e- f.1S1_ 1C TTl..10003 r....2, _ 7.!>O

' "10 r17.7~1 ' " 167ol36 '.957~ '.'0'IS e-l l-151 ..... IC ,.LSIlX14l.S02 '.lSJ21"lSCJe 1.&LS1O1.ul1O 1~1"'l.S2O 1.&LS151211 e-~ ,.. IC CMOS_ «:II ' a, <10508. _ I IIlIIC838 (DTlI " . " " , . . . " . . ", . _10i 100OflIo l..,..,'or IHl lG;'-6P1N011'1 Si><K3 <I()2116EII'0'" . la52732EII'0'" 19511~£",,,,,,, _2 a 521128 £ PAOM _ _• UI5~K 0.....1~ _ IM«:I'lo1_ Foro.o.: U9Qo'_aE._ Prqect• . •~120t3111O~ IQ W/ScleCa- , 2MUDN IiIIIlIUo_Ut_IC-SpecIl 115UON 6 1211 ..... .. . __ .. .. ...9 5UCNa' 1 6IH>SC.lF"", o..CIod<IO~~1UCH 4II011IIo-O'...... LalCl\lO.......-I- 100lM3J9 0lMJllO IUl NZ2llOl _____ . S

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•

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PO Bo~ 12/ 18 Copac"bana20000 Rio (it Janeiro. RJB,ull

BRAZIL

would w. lt under _ .l leet 01co-c..te,he ret racted his sugges t ion, we reverledto Ihe original p lan. and the antenn. swere lowered salely In about two hourS.

PAULO SlMPlICIO PY1AOA

As I 1'1_ wrillen belore, $OITMIllmes Iha... to tr. vel due to my job. Duri"ll lhasetrips when I have Iree lime. I li ke to visitfnends. moSI 01Ihem known lor more thanlwenty y.... through otH contacts Ofl radio.

On my last trip to Recile l$late 01 PlIr­n.m buc ol . I asked Bart PY 7AKW (a­

PY'CO alld PYlDX on 51. Peter &. PaUlRocks) to go with me to Tlmbauba. a verysmall city with many Shoe ' aclories. Asyou surely know, Brl.!lIls the grealest ex·porter 01 shOeS to the Uniled Slates andyou may be pu lling on. pair made in TIm­

"'''''-In Illat city I was .n.ious to visi t Paulo

SlmJll lc lo PY7AOA, who i s the lirst II·censed amateur there. He Is • very wellknown petSOfl by e~erybody. We didn 'tha~e his . ddres.. but II was nol dill icuil loreach h is houle. We juel asked people andtl'l<ly showed us tile dIrect ion . Thto housewas IDeated on • very narrOW st ,eet nearlhe m.in squ....

The last lime I met Paulo person.lly wasabout eighteen years ago. On the bandshe had an unmlstak.blevolce-very grave.nd sounding like. thunderstorm.

Un lortuna tely. he lost lha t beaulilu lvoice, $0 _ will .-. hear it .gain. Hegot .ick with cancer. and the llOel ors ...moved the upper part 01 the trachee cOn·tain lng Ihe vocal cords.

He lold uS thaI . I ter lhls serious sick ·nns he thought thai he would nol ha...

NEW TOWER LEOISLATION IN VK3

New planning conlrols h.... been Intro­dUCed In the MetfOl)Olilan .r.. 01 "'*bourne. Alter . lOng Dallte by tile WIA.wit h many submissions to the pl.nnlng.uthorltles On beh aU 01 all .mateurs. Itaeems we ha~e . galn gotten the shOrl end01 the stick. It .Iso appears that no mall..-""I we do In the way 01 COfT\fTIUnity ser·viC., we .m.teur• • re sUlI • m inorUyvoice. as you will note by the regulat ions.

TV viewe's can h... antenn•• Ofl I l'Ilntowe" as high as tney Ilko~ CB oper·. Ior, can 1'1..... lhel. 4< Of 5-e1......,t yaglsup In the . Ir with vlrlually no conlrol . bulwe amateurs are governed down by tnaregulatiOna II we want beam . nl.......s on15. 20, 0< 40 met.... Pari 01 tl'll new regu­I.tions tOIlOW:

A Radio Masi is a mast wh ich. togetherwllh antenn. :

(I) e. ceeds . height 011. meters above

,~""(2) when allached 10 a building e.ceeds

a height of 5 met.....bove the rool line.(3) has any horizontal dlst.nce In ex·

cess 016 melers. Of(.) has a enccture, not Including the an·

tenna, exceeding 50 cent lmet In widlh.t ..,y polnt In exeeaa 01 3 met aI::lOve

g.ound .......With the atlllude 01 some 01 OUr local

councils. • ny new amalsulS. without priorcouncil .pp,oval. wil l h.ve li ttle hope 01gelling even a 15-meter dipole up Into the.Ir, let atone • TH60JOt al a ra.sonablehelgtll.

Groupl. SOUnd Out Se<vicas. t ile Ren.I.sance Towe. Rest . ura nt M ana gement,and the m. ny . mateurs themsel ~es whocontributed lime .nd ellort .

STICKY TAPE AND STRING

Tha p1ob1ems 01 erect ing len'IpOf&r)' HF..,Ien.... on t l'll root oIa City building _emany. Thto moal Import.nt consill<lr.t ionwas 10 ensure sa le ty lot bo th the c.eweractlng the antennas and Ih e gener.l pub­lic below. Membe<s 01 the antenna crewwere no ...1worry, beclluse one 1001< overthe .. 01 an elght-sloty building Is . 11 ittakes lOt aetI-p I ,,,,.t ion 10 take over; ..,ythoughts 01 daring deeds v.nish inst.ntly.

The sa tety of tha public Is .nother mat·ter. We had 10 eteet an elUc lent antennasystem that wou ld stay put lOf the dura·tlon 01lhe project, not lall oil the buildingand cause Injury below. not 10 menl ionl earrangi ng the nwr and al""", ,1 !lPIC lng01 the antenna.

The antennas we decided on were. 204SA. ....Iemen l. 2O-meler monoband yagl.which was kindly made av.ilable to u. by• gentleman lrom the ne.r country.' hall.wave dIpole on eo met.... with t.aps for 40met...... couple o l trappe<f vert lc.ls, and

• VHF Slim Jim.Thto Inslallation of all these antenn.s

took one and a haU days work ing at amoderate pace• • nd although tbe roof nowresembled .., elaborate bI.d I rav• • ntennaperformance was Interesting II nol pre­dlclable.

The 204 BA exhibi ted a VSWl 01 1.1:1right acroas the band. I suspec:l thal the300 molers 01 R(HI mlgh l h a~e been re­spons ible for mak ing illook slightly better

lhan It was. The dipole, . Iso l ed with 300met.... 01 RG-8, un6erwent apparent vew.ch.ngo,s, as originally it w• • tune<! u.lng

• s.I'IOrI le-Ier. How...... tna result wasstill ...sonable.nd well with in the teOpe01 tha ectomanc AT units used. These an­tennas enabled the station 10 l ransmltstrong . Ignals. and generelly we receivedvery good reports.

Due to • high noise level, .eceptlon wasno! as good as we had hoped. The noiselIfoblem was the result 01 a ttade-olf be­

tween going lor the ellic lency 01elevat ion.nd the loc al noise generated In tne ele·vator CQnlrol room• . The trapped vert iC.l s,needless to say, we.. particu larty suscep.t lble 10 tna noise. • 1Id as • lesult t l'l<ly-...·t very successlul.

Su.prlslngly. the Slim Jim performedwell In spite o i lM l act that II also wa. ledwith 300 meta" 01RG-8.

wnen Ihe antenna craw assembled todiussemble lhe installal lon, one genlle­man (u usuaQwas hea.d 10 iWgge8t cut·l ing Ina lillY ropes aod running. Whenhanded • stlarp knile and told that we

L 10 R. PYI APS. Paulo PY7AQA. an<1 B.lrf PY7A1(W.

wide and 2.000 aw.rd. during 11l96.. Thtospecial i_ wetc0rT4. amaleu. partic~

PIllion in S.A.'s 2.000 plus planned Jubi leeprograms and extends " Happy Blrlhday"greetings 10 SA In eight dillerent Ian·guages. The I lrst Grand Prix 10 be held InA u. tra lla will coincide w llh Ihe ecm­mencemef1t 01 • year 01 birthday parties.December 28th was S.A.'s ProclamallonOIly. • nd 1M Is its 15011'1 birthday or ses­qulcentennl.1 year. Come on over .nd en­

Joy SA!S.A. has chosen 10 share and twi n Its

15Oth-year celebfaUons wll h Te_•• ' Ade­I~ and Au.l in, Teu • . btring linked astwin Cities). In exc... 01 170 lowns allddlllr!ets and 300 a<:l'IOOlS ha.. been dis.t lnctl..ly linked ilnd exchSJ19ll'S h.ve . 1·ready commenced. S.A . • maleurs see arole In pl"O\lldlng the communications linkt o auls t . where possible. w ith l owns .school., aoel l'o'ity gfOl.lPS, .nd commun ity.nd .ervice organ izat ions- a d.unllngI...... but looked upon as . re.1 cn.llenQewith . spint 01 advent ure wtl ich l>opelullywil l be rewerd lng insolar as the hobby 01amataur radio Is concerned. Promol lon.l·type acllvlt ies and wOf1<lng wll h Jubileeaoet lvltiea. II I' hoped, will provide a p0si­

t.... exposu.. ot the hobby as well as ''1aw.reness and • better underst.nding 01.maleur acllvltln In tne long t<lflTl .

" Amaleur R.dlo week. Promol lng SA "tired the Il rst Shot and launc hed the pro­gr.m. The olllcl.1 leuncn was by Dr. IanMcPl'll-i l, Cllairman oIlhe BI-State Cenl.nasy Commillee. In ttle VIP .... of theRenaissance Center Restau•..,t on the 6thflOOl'. Esconed tOUIS. preas releases• • ndmedl. Involvement In . mplilied amateur·r.d lo li nks with Tuas vi. San Francisco11'110 the Mall l ocused the public 's ette....l ion on amat.... r radio. Lat.... . pec:lal loP.PCIIf.nces by Mr. Gavin Kenel-Ily, ttle Han.I,h nl" er of Tourism .1Id Local Govern­~t,.nd. spec:I.1 amateur li nk l)<ltwefJ1\Adel. lde's Lord Mayor. Mr. Jim J.... ls. andA ust ln ' S M . yor Fr . nk Coo k.le w ereSCheduled.

The WIA committee 01 Jenny Wamng­ton VK!>ANW. Rowtalld Bruce VK5OU. alldVK5 AQZ . ckno w ledged the I ln.ncl.1spon.ar-snip 01 the SA. Department 01Tourlam. ESlrow (Clvit Englneefs .nd Suope...lsory Consu ll ants). Radio Rental s. In·ternatlonal Communication se",lces, DickSmlth ·s. The Elect ric Bug, Captain FlashAdvert ising, Norm.n'. Estal es W inery.ICl, the SOUtn Coa.sl ARC. lhe Rena i.sance Cenl.r M. nagem enl ,Emanual

:i~H:Z "~~ " .•1* "

73

Following the shott reporl In . n p l1 l".,.column abOu1 the l Sl).YN' celebrat ion, lnVK5. • '-Iler senl to me by Mr. G.ah/lmHOflin-Smilh VK5AQZ should be of inle<"••1, I feel, to any llroup planning II similarevent. G,atlam Is II controllef ot the SoulhAustrali an 150-year celebratlOfls. and thel ollowlng I. h is fftPOI1;

THE VK5150-YEAR REPORT

Elghte&n month. 01 planning to link am­ateur radio wltn S.A.'. 15011'1 blrthd.y In\966 reached IrultlOfl on Monday. May 27.1985. when VK5JSA, the speclal-e.enlscall slgn. was act ivated lrom tha cent... 01the city 01 Adelaide. The locat ion was theRerY.laaance Cent... ....nich O¥e<IOOI<s theRundle Mall.

Three operating polnts w&reeatlbl is.hed.At str&el level. a gfOUp ot HF Oll"'ato~

worked lwo ngs Irom .n OB r.dio van.•Kenwood 930 and • veeeu 751GX out 01 •2OIBA, .. elemelol monobander and •~meter trapped d ipole, ..spectlve ly . 10­caled on the root 01 the _tory build­ing .bout200' above ground level .

The ll8COfld operat ion l or CW and RTTYwas locat ed In R.dIO Rental'S (Adelaide)grou nd-lloor shop windOw (~b.nd tr appedven lCai .lIS(! at 200 ' ), .nd Il'IItnird~allied 01 UHFNHF. ATV, alld a satel li tedispl.y on the 6th llOOl' ,the leslauranl),....nich had a commalldlng view 01 Ade­I. ide and Repeale~ 5 and B In the Ade­laide Hill s.

Computers by ICL demonstra ting thelink with am.teul ladio and subslant lalvisual displays by lhe WlA S.A . Divisiotl,Int...naHonal Communicat ions services .l);ck Smith·.jAdelaide), tile Deparlmel'lt 01Tourism. and the Jubllee- l!loO Commilleecomplemenled all operallng points. Out·side scenic lilts open Into the res taurant .and an aver. o t 2.000 visitors dal ly haddirec t~II contact with amateur .io(jioduring lhe w....·s oper.,iofl.

The ac livi ly launched a Pf"OlI.am ....n ichwill continue lluoughoull9B6. As a result01 this and other planned activit ies. VK5• mateur. e_peclto propag. te 100.000spec ial Jubilee Souvenir OSL cards wort cJ.

Each month, 73 brings youham-radio news from around theworld. In this collec tion of re­ports trom our foreign correspon­dents, we p resen t the la tes tnews in DX,contests, and events,as welf as keep you abreast ofthe technical ach ievements ofhams in other coun tries.

If you would like to contributeto your country's column, writeto your country's correspondentor to 73 Magazine, Pine Street,Peterborough NH 03458, USA,Attn: International Editor.

AUSTRALIAJ. E. Joyce VK3YJ« WntIl SI,..'Alfon/l 3018Vk;tori.Australill

88 73 for Radio Amateurs • February, 1986

turns 0IJt. with Israel'l ricfl ethnic mosaic.there ase matly thou..nd Israeli, wll fl rei-­atr"llI in I flll striCken lend. Wl'Ia.t ensuedwas one 01 the IlIrges!, if not the largest.public·servlce operation In the history 01I..aellamateu, ,adlo.

When news of the d isaster was given bythe local media, It was stated Ihat since allnormal channels 01communlcations OIJI ofMexico had been disrupted, the only melfls01' relaying~ was via radio .....teurs, Almost imlTllH:lia'ely. hams alt CHef

I...... began to ree.ive phone call' frompeople concemed aboul the l ate of theirdear ones in lhe dlaast.. area.

ane 01 tfle lirst contacts wa, made bIl­Iwe" n Da. id e en BII..t .X"WH (seepflOtO) , nd Shimon Kushnir XE1GGU, Theamateurs around the ccuntry organiZedthemse lves, with amateurs In each city r"cel¥lng phone call, l rom those concerned.collating them, and having the ........tages

handled I)y IhoSe In contact with Mex ico.The .8fl1O and TV ga... out lhe phone nurn­~ of the key amateurs in each area. andtor a w..... the ll/'IOfIa1; were ringing almostnonstop at their hOmes.

With l he ionosphere being quite lickle attfll, l ime of Ihe sunlpot Cf'=le. especially0_ 'uch a long haUl nbetw""", ISf_ l andM..lco, stai ions In between flelped ou twil fl t fle relays- , uch n Mel G4WM P andIwo Washington area iiams, David K35TMand Jim IUIW. who put In overtime. Latlll'on, aboul a weel< all.. I I'>a lirsl quake. theMln illry 01 COmmunica.tions eU'ld the, lllin on the ionospI>efe by PUlling in alree t....x line 10 IUIW lrom Isr""

As Well. earty on in the OjlIlfatlOn. a listof the areas 01 Me.1co City that wereslruck Of were OK was cif(;u lated amongthe amateurs so that In many cases theycOlJld put callers Immediately at ease, The" mail box" In the Haila RTTY repeat.. was",essed Into service. carrying a lot 01 therness.age load . and proved to be qUIte In­strumental In ea"ng pressures.

Wherl the operatIOn wound _n, aboula _ and a hal l aile< tile earthQuake.thouu nds 01 lelephone calls had beenprocessed. Quite a lew amateuls had lit ·..ally wOfked them selves 10 ..flaustion,and a few score had been Involved In thisccenc , e'vlce , Am ateur rad io had .e·ceived, once again. 10 soon alter 4Z4ZB'scontact wit h tile spece ' hullle, great pub­lic ity. wit h piclur.,. 01"x..WH lind hi. ,ta·t ion .nd anlennas having appeared on tl'>analional TV new..

I he.... really not _ beogun 10 name 1M

amateur, here who _ad !'lard in tflll ....deavor, as they are many. and I woulddoubtlessly risk O\IerlOOking a lew. Hats0 11 10 them IIU'

THE SIL ENT KEYS' FOREST

One 01 the moet popular way, that weIn I'..el remembar tho'e wh o havePaSsed~ is 1M planlong of tree$. • livingmemorial to l hem_ With this CUSlom inmind. Quie ofX4CW. the chairman 01 theIsr", cflapter o l lhe Ou.rter Cenlury Wire­less Assoc iat ion and 1....l"s lirst l icensedham , conceived the Idea 01 a grove tocommemorate Our Si lent Keys,

At tef negot iations wltfltfle Keren Kaye·mel (JNF). tfle l8<ael ReIOfestalion AulflOf'ify. and a drive amongst hams and lhefamilies of the Silent Keys. enough moneywas ..,sed tOf the planllng of l he grove.and dally contribullOns cont in.... to comein lor mor" tree$.

On OC: lobe< 22nd. lhe Silent Keys' For·est was offi(;ially inaugurated WIth a cere­monyat ii , e.te In Ihe Ben Shemen lorestsIn the h ills overlook ing the coastal pla innear the Ben Gurlon alrporl . The . iewthere I' qu ile specl acular. and it Is Indll'edan ideal 'POI fOf Fie ld Oays Ihat no doubtWIll be heI<l lhere in I I'>a future.

less Planning and Coordination Wing_In­dia'a FCC) flas now gone the whole hogand announced a complete .",ision of tfleelllier enccancee. The new announce·ment opens up all the HF, VHF, UHF, andmicrowave amateu r bands to Indl&n ama­teu rs, with t fle notabl" e ' cept lon of Ihe 6­meter band.

This relaxation I' ganeralty in line wilhthe lit>eral(zatlOn In all spIIefe'-Parlicu-­..rty .adio communica.tlOns (mote on tllatIn a lat.. column~ In a strange .nomaly, 2·metlll' I'Iand--l'IeIds ltill cannot be used inl he motliltl mode without a special 9CklayauthOri2ltion Involving a USSO.80 fee andinterminable wai ling! In t fle ~nerally lib­eral atmosphere, however, ever!lody tc­nOres this lequ lrement and nobody hase_ been cited fOf breach ct tne la w!

ISRAEL

ROll GallO 4Z4MKKibbutz UnmNegey Mobile Po. t at/Ice 855J(l

Israel

THE MEXICAN EARTHQUAK E

It wOlJ ld seem I flat with I lle huge dis­tanc e separating Israel and Mex ico. Iheeart hquake disll ster wou ld flave had very1I111e repercussion here. However. as it

••'. " ~·.'••• ••... ,·' .. ' .• •· ... .

INOlA CATCHES UP

One 01 the main demlindS 01 the Feder·a toon 01 Amateu. Radio Societias of India.in lhei. discussion. wilfllhe communica­tions MInistry 01 the Government 01 Indiil,was Iflal all inl..national IIl locat ionl tolhe amat servICe I/'IOuId be ....aH.bIe 10IndIan amat rs.

After some foot·dragg i ng and hal f·hearted releases 01 some band segmentsduring the past Iwo years, WPC {the Wlre-

M,ss R. Subha

3, r "I",,·V;'Ka RoadPB NO. 125Medras 600006Indl.

authofi2ed 10 Ulll up to .-00 Watts de Inputin the IoI lowing subbands: 3520-35oW kHz,3890-3900 kHz, 7050_7100 kHz, 1"050­1. 150 kHz, 1.220- 1.320 kHZ, and 21100­21400 kHz. On VHF, the maximum cc Inpu tla 50 Watt , lor terrestrial ope,atlon .

In general, radio am ateurs in Indla flavealmolt ali lhe frequency alloca.t ion, pol-­

'ibis In Region III . the besl being the1820-186O-l<H2 and ~37ClO-t<Hz alloca­tions. This i, especlelly true at Ihl, t ime,_ l he MUF OOM down considerably Unight sell in. And fOf the reself(;!HTlindede.periment..... l he bands above UHF alsoare available , The allocation 01 1820-1860kHz Is on the primary ' flared basil : 18068­18168 kHZ on non·lnterl e' ence and thencn-protectron bas il , and 1260-1270 MHzlor Earth to sl!*Ca. Satelli te seosce only.we hope that l helll new aull'Of(zations 01emi,sIon, and f'equ&nCiea will boost up_teur act;"ity in India conalderabty,

Os V1J2A,RL

L ro R. fi""lfIQ PY7$J, pnA P$, and "'a";/(Io PY7MM

Inaugulet;on celllmon;es al tile Sllen l Keys' folllll./l to R) SMomo Aflev and Mrs VickyAIU lal, Foresta tlOll Autllorily, Q12~ OSfin 4;if4CW. and Aharon K;rsc" ner 4X4AT. IPholOby 4;if4G T)

INDIA

_ II'Ian a I.... months 01 IiI • . 10 he nt­

lu"" 10 INm how 10 spNk again. Alte<u.. lirsllesson, he ga... up. diaappointed.

In Ihls way he lived tor a I.... months.One early morning, he got up luddenlyI nd to ld himsell. " 11m a man; I am not acal!" At Ihat moment he tried 10 work ou thow he could pronounce a syllab le.

Day /ltler day Paulo d id the ..me. No­body at 1'IOrne. IIIVIlrl h is wile. knew aboulhll decision. A I.... monthl lat lll' he wasable 10 speak '9I,n. and _ his wilecame to the breaklut table one day, Ile

aald, " Good mo.ning_hOw a•• you?"T~ We<Il a sign Ol lhei. happiness.

Paulo himsell wanted 10 teU tM goodnew I t o his dOCl or , 10 lu ,prlle h i malSO. ..and he did, In spite o f many yearsIn fl lS profe ssion. the doctor cou ld not be­1I0000e what he was hearin g. Paulo PY7AQAwas 'uch a perlectlonist that he flad de­. eIoped h is own method, and he WIS lalk­Ing almost al a normal pefSOfl.

On OIJ' wl y nome we stopped. In Ol indaand viSIted Flnnlno PY7SJ and hranildoPY7MM. we had oyatefS and beef and re­l lected upon the e,cellent day .....·d had.

JalfHt. Kalas...., IIU2ARL411 Gin Nelli 'Cocll;n 682 020India

AMATEUR SERVIC E RULES REVISED

The Wireless Planning and CoordinationlWPC! Wing 01the Minis try 01Communica·tiont of Ille Gowwnment oIlnd... by a notl-­

IlCItion dated OC:10bef of, 1985, has twvisedl he Indian Wi••I,,, Tele'llra"" (Amateu.SefYiceI Rules, 1978, 10 include _ bandsand operaling p.ivlleges 10. dllle"niclasle$ 01radio amateurs in India,

A lillie whi le ago. wilen the Rest rictedClass Licen se - the then no ·c ode U·cense-was inlfoduced, the hol ders we..authOf(zed operallon only on l he 1«_146­MHz band, With thll ,,,,Ision, they are eu­IllOtiled DOIfl 1«_1.t6 101Hz and Ut~MHz on A3E. H3E. J3E. R3£. and F3Emode-s. Only tlll'restrial operltlOn is per­m,tted tor which the muimum POW" us­able is IOWaltl.

For holders 01 tile Grade II license (Ihen.. t h lgfler ClaU), t fl e lreq uency andpower authorized On V/lJHF I' the same,However, they are perm illed to operate OnAlA, A2A. FI B. and F2A mod" S alao. rnem.jorchang&$ IOf thl. category 01licenseara in operational Parameters_ lhey arenow allOwed AI "" AJE, H3E, J3E. and RJEmode-s--<ll\ HF bands. HOW_ , autnon-­2.lIIon to _ on ¥Oice mode-s I, subject10 the sU!)minion 01 prool 01having madeat IN$t 100 con tacts with o ther lIfTlateurson CWo The new bands added on HF are1820-1860 kHZ and 3500--3700 kHz ,

Grade I Ilcenu holders , In addit ion t .:­the modes permilled l or the Grade II Ii·cense holders. ha.. AlA, FI B, F2B, FJE,F3C. .-.JC. and A3F modes on HF, VHF,and UHF. The muimum input p(/'<IrIlf eon­Ii_ to be 150Walls on HF and 25 Wallson V/UHF le"e"".1. Add i tional bandsgi......... 1260-1300 101 Hz, IOOס3300-3 MHz,and 5725-5840 101HZ. Amateur utelii te 0p­

eration II also permitted in the app.opri·ate lubbandl with a m aximum ou tput(elrpI of 30 dBW.

The holders o t me Ad.-anced Class n.CIlf'lse. the highe" category possible fOf a.adlo amateur In India. are entitled to alltl'>a pm-ileo" 01 a G.ade I license and are

73 l or Radio Amateurs e February, 1986 89

•

YAWN

In these da~ of ,ap;et de.a'~,ts intechnology, ye-slflO'd.y's achia ,emehla ere

taken IOf g,anled-commonplace. Suchwas the case on satufllay. November 2nd.when One "xcl ted ham phoned the hot line0 ' a pcputar ,adio slallon to be Ihe fi'st toreport on 4X4AS, 4X4GI, and 4Z4ZT mak·Ing di,ect two-....ay contact on FM ....lthOJISL on the otbltlng Spacelat! dUIlng Of·

I)jj 41 . (On all other otblls, OJISL onlymade reco«l'nDI 01call1ng stations.)

The YOiU at t.... 011'1e< end 01 me tele­phone .ns_ed, "So whatr

Afle' Ihe huge publicUy ' e<;eived by4Z4Z8's contact ....i lh~RE on. pleviousIlight 01 the shultla. ilIppa,ently IhiS is nolong.e, naws. Incidentally, thls ....as 4Z4lT'1I lrst sateli lle nso. using only a 5f8.wa ve·length ....hlp. and, In his e.cllement, leav·Ing his set In t!'le ~Watt poIllion! HV2VO aflfi K07RO with t2SM.

Tha Knlg"" of tha Laid T.bla.

Ozzie 4)(.CW (leff/ .... t<;N. G.nenlll.lotfHlCq; a., D.g.".rtd Prol. Amn(Hl RutHmstemshake "'11(/' at",. $JIM , .0:.,,'Forest ce<ormony. Datlid a- Bu",,' .lI.4WH IS bHlirtd.and FfO<,t. fJI..AF is OIl'''' rig"'.(I'tlolo by UIGn

He has r~ved ..lose to 90% of . 11 the

voles 01 lhe ""fl iament "nd lhe Senateand IUr&ly the IUP90fI 01 100% 0 ' l he lta~

Ian h.ms.Tho! prese l'Ia' not repaned con-eclly hIs

l'I.m aclivily, having some conluslon withCB, but our hobby has received a lot 01

I'ee " . dvertl. lng" In all new.papers.A lew minutes on tl'le lirsl channel 01

the national lelevlslon have been devoted

.Iao to And'" l8WY-who.1 the end 01July contac ted lhe space shu ttle on I WO

meltli'L A simulated conl act ...."1'1 the ..con:Iing 01 me aso has t-'l .-n du'·Ing lhe main ""'s broadcilIst.

The RadloRMsla , the magazine of t!'le

Itall.n lsague. la devoting more space 10microcomputers, From. sUNey It appear.that locally the ave,ag-e amateur 15 31ya.rs old , I. Inlerested In computers, hast,led at some t ime to build something him­

sell (mainly .nteon.asj, and Is Inl e'ested in.w.,ds (37% h.ve Oblain lKl Ihe loc.1

.watds wh ile 31% are In some w.y Inter·ested in the OXcq.

Our average h-am is ffIllding 2-75 mag.a­l ines devoled to ,edio or computers perII>OIlth and spend. S600 per ye.' lor rigs.He Is mainly ualng sse (92 % 1. aome CW

( ~2 %), an d F M (66%). He likes to ex·change aSL card s via bureau (82%) andeuect (73%). even II this second methoddoes not wori< too well.

Th is firsl su....." wlll be lollowed shortlyby • second _ on • bn:lotdet basi.. . nd it....ill be ""'Y uselul to g ive 10 the \.e.aguelIOfIIe lndical iOnf; on t..... poIi<:iM 10 lollow

In the near ""tu...A r>ew contesl group hllll Sl.rted oper.

.tin" 110m lhe Milano area. II consista 01th'ee ham•. Glo,glo t2VXJ. Ihe ARI Con­tast Manage,. Paolo 12UIY, tha Sec'etary01 the ARI OX Club, and M.rio 12MQP, the

ITALY

Mario Ambro. 112MQPVia Slradalla, 7321029 MI~rIO

Iraly

we had t!'le opportun ity lIOfIIe monl.....go 10 lnUoduce you to IllFCG-F'an.ceecc Cossiga, the Presidelll 01 the lIahan

Senate. The molll impanant Information10 ,eport 10 you flOW is Ihat he has beeneiectee President cttee Italian Republic.

Jalla stations for I i..... and II you ....ere lor·tunat" enough to ha........ori<ed 4X75TA....hen it ....as in Qpefation last yeal dUllngtha 75th annlv"rsary 01 the loundlng 01Tel·Aviv. then you ,eceive ten pojnts lorthat cont.ct Only contaclS made afte,January 1. 1~. cou nt.

Do nol Hfld OSLs but ,atlle< . net cce­taining llIe detail. of a ll t ile contilCtS: t....

Ust Should be signed by 1....0 o l l'1 e' II·eensed amateurs. The lee I. eitlle< S3.00.8 0_1.1 _. or 2 pounds $tel1ing. and . 11 t....abote should be sent 10 the ilI....ard man­age,: Shlomo Mussall 4X6LM . PO Box

6225, Tel·Aviv 61081. ls,ael.

THE TEL·AVlV....AFFA AWARD

A ""' ilIrd ha.s been made ilIvilli labie10 lieenNd 1!lUrs.nd SWL. eilIlled t....Tfll.A........U. A ard. Issued by tee ci ty ofTe4-A-.rN.Il• . it is in calof. bears a pielura01 tl'la clly·. boa.rd....alk. aOO I. s igned pe'.

sonally by tha mayo"

A minimum o! ten points ia reqUi'ed.Tel-Aviv $l.tlons counting lor one point.

At the ceremony. many VIF'w, _e pte$­

enl , including Ihe Hono<.b!e ProfessorAmnon Rubolnslein, Minl"lI' of Commu­nications, Leland Smllh W5Kl. presidentof the OCW" who had come in from an ar·chaeologlcal trip In Egypt for the ceca­sion, III, chief otlie., o' the .a,ael neteoeeForces SiO~1 Corps lGenetal Morde<;h.iBar ~ganl. the head 01 the Kefen ~l"It"

mel Aelotest.tion branch. and. of course.lhe Israel Amateur Radio Club officers

• n(llhOM ''''''p()I'l, ible lOt~no tile Pfoj·eel IhfOUOh· The _ I ...n alten<!ed byower 100'0hundred amat"u~. tllei. families,and famille. 01 the Silent Key•.

Speal<lng at the podium, the Minister 01Communlcallons praiaed the llilfTl.lor tl>eirsl,OfIil record o f ¥Olunla.y public eeosceand saki tn,tln the ••peeled eraof peaoce,radio ..,....,....rs win play. "fila! role, helping

10buIld btldQel; belwtWl ut and our ne;gn.IXIr$, ntC!I.c: lng I'lolIl ilrty it l'l frk!lndS/'lip.

Tho! (>Mtli.iOl'y c~ Itl'l tile planling 01saplings by t!'le famil ies of the Silent K~and t!'le ¥1F'a. Although the torest is , ....llyonly In Its Infaney, ....ilh about 2OCIO t ,ees do­

nated. al'aady picnic tables and benchesare tllefa. aOO II .... ill be a placa close to thahearts of all t!'le ,ad io amateurs in Israel.

lAland Smith W5KL, OCWA world pro~ldfmtlrlghfJ. Helan Smith WA5WAIl, .fIfi S/rlm,hOflLotan 4UGF.t lhe Si /eflt Key, ' Foresr eeremon~ /Photo by 4"4G T) 128 VS operating from I~,

90 73 fo r Radio Amateurs • February, 1986

CASSETIEMECHANISM

TRANSFORMERS

~-::. 6t.. r.,:01541-t:=Oll== r,,:thU ~ In:t«.c .~ __. UloCI:_C,f. ,~.::e. $lOG

_C ,f, tam $:lODCIp. IS

WALLDCI

TRANSFORMERS

~.:1~ ,'''''''--

"When You Buy, Say 73 " • February, 1986 91

POLAND

mount..in ,escue., The Polish raello-ama·teur mo _emenl ha l los t a Ilrong 111. nd.

The lilSl Conference 01 the Polish RI·dio-VidIIog,aphy CM> look place In Toruliin May. Presenl wer. lOot delegalas IromPoland .nd the 10000ign visilor. Y23NE. A.poris commls.ion ve ril l. d OS La a ndgr.nted the lirs t IIcenS4ls lor the lull memoblIr!I, SP2JPG, SP3CMX. and SP3LRS.~lurlS _. delivered on club activll" bySP2JPG. SP200V. SP3CAI. SP3CMX.SP3LRS, SP3GAX, SP6GTN. SPtiNVA,SP7CHY, SP!lJMW, S P9BWJ, ..nel TomaszIIko.....

Many palticipanls Clemonalfated lnair~ Items and OIhl1ra brought lac·lory-mada de'IIelIs. The reaoIution com­millee plepared a eomp<ehensi"" ",portlor PRAA a ulllorltl.l.

Polish hams took part In lntelnationalcontests In Ina IaSI Ih•• montna 01 1965In"O/'wlng Oceania. Spain, Portugal. Amer·Ica, Aust••lia, and Canada.

lui. Wiguel Cle Stwu CUVEPO 80_ 32S, JOIIO do Eslori/2765PO/lugal

SATEUlTE TV IS HEFIE

AeeorCling 10 Ille Mayor ol Lagoa,. par·aboIic dish will be Installed in Val_de lorthe roceptlon 01 salelllte TV signal. Iromse_era l TV networks. Talka wim tne sec·rel.ry 01 Slate lor Communlcationa ha~.

started 10 lind out 11M! belt l>laee 101 eon­slruclion o. Ille reeel¥ing station-

The projecl is part 01 an o!1iclal programwhich will Includ. Installation 01 severaloth.r dish••, one In Sanlarem and two InllsbotL The priorily projecl will be 11M! onelocated In VaIYerOe due to 11M! big COl ..........

trllion ol vtlilOl'S in llIal particular ."'lIlotna_al w. lI-l<.nown holiday resortl.

Butlhll tsn't ali. Similar equ ipm.nt, ona red...:ed eceie. ....as built and Installed bya amall group 01 CT operato,. whereF'eneh and Gemlan hams also wer. In­~olved . With Ihls l impl. but eltecliv.homemade TVRO. tlley'~e had good ee­sultl. Signals fro m eeverat European TVnelworXs ..... re seen .... ithoul too muchlrouble (HI).

WOFILD TEL ECOMMU NICATIONS DAY

Thll year, the e;o.nlS lor Ihl. celll\lr.tlontook place In Oporto, The assoctecao Por.lugU"Sa Pala 0 Deaen"Olvlmento das Te­IecomunieaeollS (Port uguese Associationlortna Oe,alopmenl 01 Communicalions)pultogell\lll an inl ..esting schedul. withOIh.r stale depanm.nts In this 11.ld, Thl!)'..... r. to leI people kno .... a 111lI. more aboulth. wireless wOlld; HIl!)' ....ere appreciatedby atuClenll, technic ians, engi_I, .IC.

f IRST CONGRESS OfTELECOMMUNICATIONS

II elfllrylhlng goel on schedule, this 1m­portanl meeting .... ill be nald this monlh(february. 1986). It will be _ad 10 de­_eIopmenta and changes, Fore;gn rllP'e­sentatives .r. expec led. fotum Pieoas inLllbon (opened recently) has a ll the lael li.ties needed lor I...:h meetings, 80 theCongress will be tl'lftre,

PORTUGAL

VlSITOFlS IN LISBON

Once again, we've haCl • .,jailor here Inth. ahac k, Tom Phipps KA.CSG, IromTe. as (I'm sorry, Tom! We don 't have any '0­

deos in this COUnlr)1 was 1\lII. and _ had anielI chat. Many ItIank.a, and keep tlOPngIna Atlanlic. You .re a lways~.

~...

n01n

•. .. ,.... ,..,.,',...~

•

J..-zy SZymczak7"-2()1) Bialogan1

BuW. '"Po/and

The IX Nationa l COngress 01 PAAA,which look place in W.rs.a ...., adopled •program 01 aelhrity ineloding work on cru-­Cial problema 01 de' elJP'TOlH'1 ollhe A.aoaoelalion . The COngle.. recommendedtnat PRAA ,econsldel Ih. organizationalslf...:tur. 01 the Assoe la tlon and e _en toliQuldal. ncn-acttve . amall OislrlCI6oards. The Congle-s5 also lecommendlId'estrleting tile number ol dOmeSlic com­peilliona and ClIf1llicates.

The PRAA pianned to obtatn permiss ion10 work with portable and mobile devices,wilh a second QTH, and on _ bandS'OIIII rnemblIrs. n. Association would worklor cancellation ollhe order ollila Mmls­try 01 Communlc.tlon .lIowing possiblerelusals 10 Issu. or the canc.llation o . aham lieenlll withou t giving th.e reasona.T.... Headquarters ol PRAA I'I0ged to pub­II.,.. a regl"", ol PoIi$/'\ amateuHadio sta·lions and bring II up 10 CIale.

The PRM will collaborate willi othel In'slltu tlon. to work OUI national Slandard'!ol leehnlCal ~amel". 01 eIlIelronic de­vice. r.latlve to lhel, .lectro-magnel iCcompatibilily.

The 10llowing were s.laeled to PRAA:Jerzy Rutkowski SP5JR, Plesldent~ WiktOfCI>ojnaekl SP5QU, StanIslaw Maelejklew·iel SP2JS, and Pawel Kaniul SP9HG , VicePresidenta; Secretary Genelal-Jerzy 1.4'$0k l.wlc Z SP8TK; T' . as u re' - Zb ig n l. ....Klossowskl SP.BQW; SW Manag.r_ J a ·c.k Rutyna SP9AKO: UHF Mana ge r­Zblgniew Malik SP6AZT; ARS Manage<­J.rzy Klabon SP3FFN , Ind Me m be' InCh.rge 01 propaganda .nd youth-JanlJldno SP5XM.

I will wrlle l" t. r on whal tlle PRAA ....orkaccomplishes.

In AprIl. 1965. • lespected member 01PRAA., Wiklor CI>ojnaekl SP5QU , died. H'.wfillng i Inlomled r.aders 01 Po/ish Hemmagazine a bout cu rren l events in the ra·dio-amateu. fhO'<ement. EClltor·in-chiel 01th.e Bulie,in 01 PRAA. na prepaled histwenty·llltn Juililee Issue. SP5ClU won Inasecond prlz. ol ·'MaSlel 01 Technology·'lor collaboration on the produc tion 01a ra·dlo te lephone. "Klimek," lor needs 01 the

Tom Phipps KA4CSG. F,. Hood. 7e_as, ie'I, ..it/l cr.UE.

RAO UL ISLAND

Chria HanlllQan ZL8OY!ZM80Y will beoperating lrom Raoul lal.nd (Kemladeea\th ro ug h september, 1966, ....hlle on a tour01 duty a t Ih......a th.r slallon on Ihe Is­I.nd. Chris wltt be operaUng moally in Ina_Inos (aboul 0600Z onwardS) on theua.ual OX aloI. ol tile v.riou. IrllQueoein.both phone and CWo H. does NOT operatenets or 1111s. He will be using an 100M lOtand a home-b,ew linear on the HF bandsand an ICOM 5IlO lor six melef$.

Anlenfll$ witt be della lOopS tor 80 and'-Ornel.... a Ihr~ement TET yagi lor 2011511 0 meters (II th.e pans arrlv.ln time), aIflInical lor 160 m.ters, anel a liv_lementyagl on 6 mel....

Chrla lookl forwa'd 10 m.ny OSOswhile on Raoul_many OX operalOl'S willhave wo r ke d him wh. n he was onChalham Islands rocenll y. and may alsohalfll worked him hom the Auckland Is­lands-ali QTHa Ch'ia has been 10 onlours 01 duty with Ina weatl\lll seMee_asLa 10 ZUOY (Chris Hannagan, The T..·race, Warrington. Dunedin, New Zea land)or Ihe OSL BU'.lu will be handled duringhis at>s.ene. by his XYL

WAFININQ

FlecenUy an amateu,'eeeived a warningI.tt", because hi. station was net beingoperated In a mannel In keeping with theIpiril 01 amateur radiO and Ilia regula·lions. He had been monllored by Ina oll~

cial monl lorlng .tation. whieft observ«IIna following: The st.tion Irled 10 breakInto a con~.rsatlon between t....o oth",o_erseas .tatlons by repealing lusl theflrst lwo phonellcs 01 hla slalion callslgn_ and 0¥lIf. He repeated this conlinu­ously lor 20 milWtes belore na was linallyac know-Iedged. Only then did na gllfll hiSFULL call1ign.

How often do we h.lr Ihis on Ih. OXb.nds? Harmle.. e no ugh. some migh lIIY. bul if is in confl;et with reoulation.blIeauaell creates Mharmlul Inl.l1..enee.M

Inllif\081 on the proper use 01llle callslgn,Ind I. ....ay ou l 01 line ....Ith Ihe Amat. uraCode. Think how otllef amat.urs hearingOIItbu-rltl o f Ihi. Iype would judge lellOwamaleurs In tna ollender'. country. Con­sldeoralion lor 0I1'Iftr. i•• virtue nol plIC-­

Ii<:ed aa well loday as !t used 10 be In my• a rty d.ys o . h. m radio.

gion III, the rest 01 Ille world.NZART is a fo unellng member 01Ihe Re­

gion III associa lion and plays. leadingrole In ita aclhritin. Eeoch IARU Regionholda a Iriennia l ccot..eoee so II\.aI t.......la a reoional conlerenee each yo:tar.

A. NZART was tile host socl. ty, I .... 111report on tile ev.ntln my next column.

D. J. to..)Chapman ZL2VR. 59 If.ennedy RoadNaplf#rNew Zealand

IAFlU CONFEFI ENCE, 1$85

19l1S was Ina Diamond Jubilee ol IARU.and New Ze.land was lIonofed 10 be tnahosl COUniry lor the Region lit Conler­.nee_the 60th .nnlver1-llry 01 the fo und­Ing o. the Inte rnat iona l Amate ur RadiOUnion. II Will nald In Auckland.

The IARU IS Ifla' link belw--, 00-'" 2 mil­lion rl(fio lImatoura in t22 countries .ndIh. Internatlon.1 T.lecommunlcatlonlUnio n, 01 ....hlCh the Amateur service andthe Amateur Satellite servlc. ar. part.Formed In 1025, Ina IARU has OOsefVlll

Italua .t all ITU conl..enees. It Is eon­lIoIled by an admlnlstrati"" council drawn110m II l lhlee 'eolons.nd an Int.rnationalSeerelarlal provided by the American Ra·dio Relay Leagu•. The Regions 01 IARUale Region I , Europe , Alr lc. , and theUSSR; Region II. Ina ""-'cU, and Re-

92 73 for Radio Amateurs · February, 1986

NEW ZEALAND

Mu t2DM K

~'a {l'iYIl a \(X)k 10 ....1'Ia11lll been dORIlby 12DMK during his 26lh and 21th expedi­tions. The IlflIt was from June. 10 12 wilhMax I20MK and ENo 12BVS 10 IBe. Vento­t_ laIand, IOTA EU 45. The i.land is in IlleTYf1T*Il.n SM. 15 mileS !rom tile COIoII. It1.2 milellong and Ina than 1 mile ....Ide. tt....as ulMld lor a prison during Ih.e Roman Em­pire and during the Jalt war. AGP lor 040 and80 met_ ....as l"'Jtalled together wilh • 2­ela''',1 tM.m lor 10. 1S, and 20 meI_.

oGOOOSOs were m.,;le, 60% ON and.a(l%pI'Iona. On June8. the i.land 01 Sanlo Ste­'ano wII act ivated on all bandl with 0400conlac... The .tatlon ....a. In.talled In asentry post 01 lhe old penitenliary-.

A"""" was Ina month 01Ifla' expeCl,11OII01 Max 12DMK 10 Slromb<Mi.IOTA EU 11,willi the u.ual call.ign 01 I20M Kn 09. Op­llfalion. we ra on a ll HF and VH F bands,both CW and SSB.

Stromboli Island has a surtaee area 01 5square miles, and illIIIll'Ill only YOleano

In Europa..tle«l pttrennial omopllonS comeIrom Ilalhr" moutlll, alIoOllng ineaneles­Celli masaea and burning lapllli to wardStna "y,

for' bcMh operaliona. OSL ~ia 12MOP,

HF and OX Manage<. The grOlip hall beencalled "The Knights 01 the If.ld Table" andIntends 10 particiPate In all lhoe main con­tesla. One problem eluring II'Ill lirsl oper.tion was lhal no OM agreed 10 operatewh ile Ihe othe,a wel e eallng-he wasal la ld 10 lind nolhlng left lor hIm.

II you 1001< al the photo you ....i11 under·stand. t2l,JIY and I2VXJ ale wllh guelt op­..ator Jimmy WA.2JNN during lhoe WP)(r::-I<I. II was one ol _al p.izza borN_s,and lrom Ifla' piUal sIle you can u""",,­al.nd it Will not ••ncrt one. It can jeop­a rd ize resu lt., bu t It does no t mailer.Food, wine, and da",., are OUI main in t..·eat; ladio is only!\ollCOnd.

IK2OVG. 12CZQ, and IIGPV operaledlrom HV2VO. Many conlee.. have beenmade on the low bandl from the Vallcan,thank. 10 • apeeial anlenna, a vertical....ire 80 mel_ high. ..ected with a amall_tal_It has performed ><elY well on 80and 160 mel.. and will be used agUI inthe luture .

Another phOIO I ho ws HV2 VO wil hK0 1RQ and 125M.

INVENTORY REDUCTIONPRICED TO GO!

EXPLOSIONOF

VALUES!

VISA/IIIASTER CARDFREE SHIPPINGON MOST RIGS FOR CASHI

MIRAGE

SANTEe

•NYEVIKING

We must make room for yourtrade-ins. Check row lor lowest priceson prevkMJsly owned bench-testedequipment!

~~ S.A.S.E. FOROUR~..... " BENCH-TESTED"

'-.- ,,0 usen EOUIPMENT LISTING

CALL TOLL FREE FOR QUOTES

I I

HUSTLER

b

,NEW! (COM R70()() RCVRe-rs oontlflUOU5~ mhz 10 21Jhz!99~"ori.s ..... f"III-.te.• eI(:

lCNldItd with ",.Iures, Available NoYemDe<, 1985.

MON-FRI 9 AM - 6 PM CENTRAL TIMESATURDAY 9 AM - 5 PM

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•

MOVING?SUBSCRIPTION

PROBLEM?Get help with your subscription bycall ing our new toll free number:

1-800- 227-5782between 9 a.m. and 5 p.m. EST,

Monday-Friday.

If possible, please have your mailing labelin front of you as weI! as your cancelledcheck or credit card statement if you are

having problems with payment .

If moving, please give both yourold address and new address.

" When You Buy, Say 73"

Selling 73 for Ra­d io Amateurs wi ll

ma ke mo ney for yo u.Consider the facts:

Fact #1: Selling 73 for Radio Am·ateurs increases store traffic-our

dealers tel l us that 73fo r RadioAmateursis thehottest -selli ng amateur radio magazine

on the newsstands.Fac t 112: There is a di rect correlat ion between store

t raffic and sales-increase the numberof peoplecomingthrough your door and you' ll increase sales.Fact #3: Fact#1 + Fact #2 = IN CREASEOSALES,whichmeans more money for you. And that's a fact.

For info rm ation on sel ling 73 tor Radio Amateurs, call8Q(}343-0726 and speakwith our direct sales manager.Orwriteto 73 forRadio Amateurs,60Pine St., Peterborough,NH 03458.

'7!:) for llildioI J Anmteurs

80 Pine Street Peterborough. NH 03458

800·343·0728

73 for Radio Amateurs . FebruarY,1986 93

DEALER DIRECTORYf Oll la.. CA

c 11.. _K.UN.O'l l ...T... _ .e-. e- __ "'"_ ., I - . .......C8_.---_ -..- -.. ......,__. f .\ nm.tU."'I .

PI'fttOIl IP__ ..~Z_ _.of_ _...... 1 .. • _ _ _ ,......c..._1.... ._°. ,'lI .

"'_. _10 IlloOJ, 151&lC.

ROPAGATIONJ im Gray WIXU

73 Staff

EASTERN UNITED STATES TO:~" c...-UE GMT : 00 00 • • • " " .. " " • »

S.. J ..... CA~ ...__ o..l<r'~_ICOM.l...l • •

.~~ '" zc.....-.._----._..- Kll':. K_ . .-.EA..~._. F.._..,..,... ,odoo_ 1; _ ...... r......." "'_ . A ~C ! ..~' .... zo '" '" '" eo eo '" " is

of _ . No oaI<i ,.. ;" Dolo...... , On< mil<..USTRAL'A zc zc .. .. ao ao ", ",100"1. ~. ~..... r",·loc. Son'", " ......, off I ·" . ll<Io.... A_..... ~...... 71 _C......L ZOOIE " '" zu .. .. ao ro " " '"

, ,..,..._... __,,•.,I"'" ~. "'...._ _ ._ C_ .1M: 197]1. J:..na,

'" .. so '" sc '" '" zo ac '" '"...... (·_CA_~. 1....U.OOO

...._ 11 '" zo .. .. ao '" ", ",_.. ao '"' ac ",_..'" zo '" '"

Uttklon MA l )torry NH _XIeO " ao zo su .. zo zo t s " ". ",Tho _ltk ..... ""'. ........ 1'<~. FuU b... of s.rw... 'ho ..... """''''''''' ' ..',h ..... ond _ " " L' • • '''l' zo1COIot .. K_ . Dt• ••. 0.;.•• Il.lW_ "l_. ..... _ I Mol _ _ ...jo<_: !'VI RlO."eo " ao zo .. .. zc an " " '" '"...... c..... .. l"" \ ...... 1M-. H_ . Tdo1I .-.EA.. -. Illl...... e-:nn. f ..-, 1-t7. MlUTH ..,~,C4 ..' ," rs " " '" '"Hy....___.• _ P-S. ."'- <-.. H_ . K.UN. K_ . KLM.~ U. $.$. " co so so '" '" '" '"

,....~_.....~ .. . - -..~-" ........_--- ..... COAST ee ee '" co so '" '" ao__...._.-.--..F.._of.... ......_-.. IO-T-,~~

' ''''''P. n:.l--O>M U ...._ ( . • dA, . n d 10·) frida~ and Sa,.rda~ . 1.1...""..

." Gttoo Otd. (It,. 11'1. 1..._ . "' ... f l _ , .... I_ . IL •• • IJ .. ' ....... u...,N H 8JOJI.

JoAOI'_, 4J4.5J7!, ao....CE .." .... '" .. so rsoWCTRAU,t, " '" zo '" zo

lJt:.ALEk-'i CAIOAl l Olll zc so .. .. .. '" zo ac " " " '"Your comp;on~ mum and mn.5a.e can contai n up 10 2S words for as lillie as UOG LA..O '" '" .. " '" " '" ..SI SO ~earl~ (prep;oid j, Of SIS per mont tl (prepaid quarter l ~) , No mell\ K'" of " ....A" " zc .. su .. " "mail-order bu, inC'is or area code pcrmiltw , Dircctor~ text and payment must ,..0 ' .. " ao ao -o ao '"'reach us 60 da~s in advanL'c of publication . For exam ple, adver tis ing for the

_..'" ..' ao

April ' 86 i",uc m""l be in our tlamb b~ February l SI . Mail 10 7) ~agazine ,w.~ zu eo .. .. .. .. zo '" " " " zc

Pfterborougtl. NH 034S8. ATTN : Nancy Ciamp;o."" l _ n zo_RTO"OCO ec " " so so zo " , z$OUTH " 'RICA '" " ac auU.I . S. ~

F

""1

4F

FEBRUARY ,.

1 = May be open on ly once or twice during month.• = Try next higher band.

G =Good, F =Falf, P =POQf.

!3G

~~ " " " " " " " ""'~GE"T'''. " ac " " " '" " " " "_ TIt"L'" ," " '" " " " "CA....llOllE zo " " " " " " " "( lOCl .... O '"' " zo ac

.... ..AlI " " ao au zo eo''to'A ac_..

" " " " " " " zcw.~ zc " " " " zc ,""U""'Nn " ae " " " zc!'V. IITO ~ I(:O zu zc " " " ao " " "SOU TH "," ,e.. " ", ", " "U. I ,S. ... " " ", ", " "EAliTCOoUT " " " " " " " "

Plea<;e delete my name from mailing li~ sent to othercompanie; or organizations.

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ATTENTIONI---SUBSCRIBERS------i

94 73 for Radio Amateurs · February, 1986

ADVERTISERSAEA/Advanced Electronic Application s... . . .. . .. . .. . . . . ..... ... .. . . . . . . .59Advancad Computer Con trols .••. .••. 13AU ElectroniCS ••. . .. . ... ... . .•••••. 91Amateur Comm., Etc 71Amateur Etectroo ic Supply ••.• . .. 48, 49Amidon Associates ...•••••••••...•. 13Ampro Computers , Inc.••••••••••••• 18BJX Supply Co 35Barker & Wil liamson .. ... ....... . • . •35Barry Electronic s .•. .•. . •.... . . . . . . 19Bill Ashby & Son . . . . . • . . • • . . • . . • . . .86CW Commu nications, Inc.• •. .• • . • • . •50CES, Inc.. ..• .••.•• . .•• .•. . .. . .••.•96CeCo Communications .47CMC CommunicaliOfls ••••••• . ...•..3o'Charge-R ite ... .....••.••••••••..•• 12Communications Special ists, Inc••.•• 11Computer Trader 8-4Conneet Systems, Inc. .... . . . . ..••••. 2Crowley Mfg. Co 8-4Crumtronics . ... . . . . • . . • • . • •.. ... . . 71Dayton Hamvent lon . •..••..• . .•... •35Dick Smith Electronics •..•. .•• . •• . •. 86Doppler Systems . .. • • • . • • . ••• .. • . • .69EGE, Inc..•••••••. ..• ... .. . . ..•.••83Etron RF Entefprises 71Engineering Consul ting . . . .. . • • • • • • •59GLB Electronics 43H.L Heaster, Inc.••••••••••• . .. .... 65Ha l·Troni ~ .•••••• . . ... .•. . . . .•••••. 46Ham Radio Outlet • . . • •. . . . .. .... • • • . 1The Ham Station .• .... . •. . .. . . ... • .46Hamtron lcs, NY .. • . . • • . • •.. . . . ... • .77Horse Sense Soft ware • .• . . . . . .. . .• .84ICOM America, Inc . • . • • • • • ••. ... Cov. IIIndiana Hamfest ....•••••••••....•. 59Jan Crystals ••••... ... ... .. .•••••••39John Meshna. Jr. Co., Inc. .. . . . . • • • • •78Kantror. iCs •••.....••••••••••.. .85, 87Kenwood 5, 6, 9, Cov. IVLarsen Antennas •. . ... ... .. . ..•.••. 39MFJ Enterp rises . • . . • • . • .. . .. . .. 14, 15Madison Elec tronic Supply . •• . .. . . . .33The Mart in Co. • . .. . . • .. •.. •.. • •.• •. 80Merri mac Satellite • .. • •. • . ... . .... • .80Micro Con trol Special ties •. .. . .. .... 85MiCro l.1art •••••.. .....•• ..•••••••. 87NCN Electron ics 80Nemal ElectroniCs 80P.C. ElectroniCS 38The " PX" Shack .....••.•••••. ..... 23Pac-Comm Pack et Radio Systems, Inc•• . . . . . . . . . . . . . • • . . . . . . . . . . . • • . . • . . 47OEP's .. •.. • . .. . . • •. • . .. • . .. . . . .. .80Radio Amateur Callboo/(, Inc . . .. . . • ..65Radiok lt ••.••.• . . .. . ... . .. . .•..••. 70Radio Engineers ••....•.... . .••.••. 71Ramsey Electron ics •••.• .... ...•••. 797:J

Back Issues 65Binders .....•••••.•..... . ...•••.&4Dealer Ad 86 , 93Maili ng uet 94Moving . • •. • • . .. . . . . .. ... • • . . • . .47Subscriptions .. • • . • • .. . . ..65, 81 , 93

Salman . •.. .. . .. . • • . • • . . . . . .. . . • • . 13stec Electron ics . .••.•••... .... .••.80Spectrum Communications .. ....••••95Spectrum International •........••.• 70Ten-Tee ••.••... ....•••••••........86TNT Radio Sales 93TransleleroniC 39University Micros 65Vanguard l abs •.•• ... .... . . . .••.••71W9INN Antennas .• . .•• .• . . . . . .•..• 71Western Electronics . .•• . .. . . . . .... .69Yaesu Electronic s . . • . • • . . • .. . .. Cov.11I

" When You Buy. Say 73 "

And that's not all. ..We also make-"Super Monster" ~

150 Wt. 2M & 100W 440 MHz VMobile Amps• 2M: 30 o r 10W in. 440 MHz:

40 or 10W In.• Unusually massive " deep fi n "

heats ink allows h igher dutythan competi tive units!

• Many built-in protect ion features• Automat ic AF sensing SCA100M

Rcyr., Xmtr., Control Boards, Duplexors, Antennas, Cabinets, xews, etc., alsoavailable. Amateur & Commercial .

m;m:..", C.1I Of wrile today to< detaila, Sold Fac tory OJ,ocl through E_porl Reps, only

/SCI SPECTRUM COMMUNICATIONSDEPT. $201OSS W. GERMANTOWN PIKE"NORRISTOWN. PA 19-4030(21SjI31.17100TlX U6-211

73 for Radio Amateurs • February,1986 95

WAHIlANTY?YES , 180 days or werran­Iy protecnon. You simplyca n't so wrong .An FCC type acceptedcouple r is available fo rSMART PATCH.

,

Placing a ca ll is simple.Send your access codefrom your mobile [exam­ple: ·731. This brings upthe Patch and you ..~II

hear dia l tone transmittedfrom yUUf base stenon,

Si nce SMART PATCH ischecking about once persecond to SO?(' if you wantto dial . all you haoe to dois key your transmitter,then dial the phone num,

ber. You will now hearthe phon' ring and some'one answer. S ince the en­heeced control sY1"tem ofSMART PATOI is coe­s tantly c hecking to we ifyou ..-tsh to talk , you needto simply key your trans­miller a nd then talk .That's right , you s implykey your transmitter tointerrupt the phone lme.The bese station auto ­matically s tops transmit­ting after you key yourm le . SMART PATCH does110t require a ny specialtone equipment to contro lyour base station. It sam­ples wry high frequencynoise present a t yourrE'CeiWT$ discriminator todeterrnme if a mobile ispresent . No words or syl!a­bles a re ever lost .

SMART PATCHIs AU You NeedTo AutomaticallyPatch Your BaseStation To YourPhone Line.Use SMART PATOI for:

• Mobile (or re mote base)to phone line via Simplexbase. (see fig I .)

• Mobi l.. to Mobile via In­terconnec ted base ste­tiom fo r ex tended rang£'.(see 6g. 2.)

• Telephone line 10 m obile(or remote base) .

• SMA RT PATCH usesS IMPlEX BASE STA­TION EQUIPMENT. Useyour ordinary base sta­lion. SMART PATCHdoes thi s without inter·Ien nq wilh the norm<ll0 St' uf your radio ,

How To UseSMART PATCH

.­---

- --.~.

- -I

. ~h ~1E3't.=-- --

--,-

--

-_.

-- ~---

The best way 10 decidewhat perch is rig ht for youis to fi~t decidl" y,'hat apatch should do . A piuchshould:

• Giw com ple te contra l tothe mobil!', <lilt/wing fullbreak in operation.

• Nol Interfere wi th thenonna l ooere uon of yourba se Mation. It shouldnot require you to con­nect dod djscormect cab­les (or flip switches! )t'Vt'ry lime you wish 10

use your rad io as a nor­mel bdw station.

• Not: depend on volume orsquelch wllings of yo urradio . It should work thesame regardless of whatyou do with these con­truls .

• You should be able tohear your bese s ta tionspeaker \...ith the patchinstd llt·d. Remember, youhave a base s tation be­ca use there a re mobiles.ONE OF TIiEM MIGt-rrNEED HElP.

• The patch should hawstanda rd features atno exira cost. ThI'5t'

should include program­m able 1011 restrict (dips"••ilchl'S). tone or rotaryd ia ling, prcqrammablepat ch and aetivllytimeT$, and front panelind ica to rs 01cha nnel a ndpatch sta tes.

ONLYSMART PATCHHAS AIL OF THEABOVE.

Now MobileOperators CanEnjoy AnAffordablePersonal PhonePatch••.

What ToLook For In APhone Patch

• Without an expensiverepeater,

• Using any FM trenceivera s <I ba se ~ t<l ti(Jn.

• Th.. secret is <I SIMPlEXa utoperch . Th.. SMARTPATCH.

SMART PATCHIs Easy To InstallTo inst a ll SMAHT PATCH,COIU' ''Ct lhe mulncoloredcom pul..r s tyit' ribborJ cableto m ic audiu, recejverdrscnnunator. PTT, andpower. A modula r phonecord i~ provided for con­necnon 10 your phone sys·rem . Sound sim!lle'? . . .IT IS!

-

Communications Electronics Specialties. Inc.P.o. Box 2930, Winter Park. Florid" 32790Telephone : (305) 645.0474 Or eeu toU-nee (800)327-9956

High power to get you out.Battery saverto keep you there.Where other HTs don't make it. 'aesus 2-meterFT-209RH and 44O-MHz FT-ID9R keep goingsuoog, Here's why:

Our 2-meter model offers you 5 watts out­put And our 44O-MHz model offers 4lh watts.

Yet theres no excessive battery drain,thanks to a un ique user-programmable FbwerSaverWhen activated. it puts the rig "to sleep"while monitoring. and "wakes it up" when thesquelch breaks.Thus. you can listen for hourswhile keeping plenty of power in reserve.

And despite the wealth ofadvanced fea­tures. operation is actually simple and intuitive.That's why our radios are so much easier to"learn' than any other advanced HT

At the push of a button, you can recall theinformat ion you've independently stored ineach of the ten memories: receive frequency.standard or non-standard offset. even toneencode/decode.

Monitoring your favori te repeaters orsimplex frequencies is just as easy Just touch abutton to scan all memory channels, selectedones, or al l frequencies between adjacent mem­ories. And use the prionty feature to returnautomatically to a special frequency

Bring up controlled-access machines withthe optional plug-in subaudible tone encoder/decoder. independently programmed from thekeyboard for each channeL Then use the decodefunction to listen for tone-encoded signals onselected channels - without a lot of chatter

Finally. both HTs cover 10 MHz,and comecomplete with aSCO-mAh battery. charger andsoft case. Options include a VOX headset andhard leather case.

So next time you visit your dealer. pick up'raesu's 2-meter FT-209RH or 4'lO-MHz FT-ID9RBecause they not only get you out they keepyou there too.

~ SUOur 30th Anniuersanj:

'taesu Ele<:bonlc:s Corporation6851 'Nilthall V'ohf. Paramount CA rxmJ(213) 63J-400Z'taesu Cincinnati Service Center9070 Gold Park Drive, Hamilton. OH 45011(513) 874-3m

Prices iIld $pee;iflQltion$ $ubject to change w ithout notice.

s!

Super-compact mobiletransceiversTheTM-201B boasts a powerful 45watts output, easy-to-operate frontpanel controls, and ultra-compactsize. The GaAsFET receiver frontend provides high sensitivity andwide dynamic range. Receive andtransmit characteristics are tailoredfor minimum distortion and excellentaudio quality. Both the TM-201B andthe TM-401B are supplied with ahigh-quality external speaker, 16-keyDTMF microphone and mountingbracket.. 45 watt outpu t, with HI/LO power switch

(TM- 401B has 25 watts oulput.)5 W low.• Dual digital VFOs

TM-201B covers 142-149 MHz, includescertain MARS and CAP frequenciesTM-401B covers 440-4 50 MHz

. 5 memories plus "COM" channel, withlithium battery back-up

• Programmable. multi-function scanning• High quality external speaker supplied• Audible beeper confirms operation

Optional accessories:• PS-430 power supply• TU-3 orTU-3A two frequency lone

encoder• FC-l0 frequency controller• MC-55 (8-pin) mobile microphone• SP-40 compact mobile speaker

• SP-50 deluxe mobile speaker• SW-100AJB SWRJpower meters• SW-200AJB SWRIpower meters• SWT-12m antenna tuner• SWT·2 70 cm antenna tuner. PG-2K extra DC cable• PG-3A DC line noise filter• MB-201 extra mobile bracket

Optional FC-l0 frequencycontrollerConvenient control keys forfrequency UP/DOWN, MHz shift,VFO AlB, and MR (memory recallor change memory channel).

More information on the TM-201B/401Bis available from authorized dealers.

1M-401B 's SO'71lii1r ro rhe 11./-:xnB_ buI covers 440·4 50 MH# and ~ 25 ...ensSpecdlCartOllSand ptlCes subjec1 ro change wlfllOulroorlCe or OOllgarionComplere se-vce man",,'s are available /of d rnO·Kenwood lransce'vers and most eccessooes

KENWOODTRIO-KENWOOD COMMUNICATIONS1111 W e st Walnut StreetCompton. centome 90220