UNCLASSIFIED

AD 402 262

DEFENSE DOCUMENTATION CENTERFOR

SCIENTIFIC AND TECHNICAL INFORMATION

CAMERON STATION, ALEXANDRIA, VIRGINIA

UNCLASSIFIED

NOTICE: When government or other drawings, speci-fications or other data are used for any purposeother than in connection with a definitely relatedgovernment procurement operation, the U. S.Government thereby incurs no responsibility, nor anyobligation vhatsoever; and the fact that the Govern-ment may have formulated, furnished, or in any waysupplied the said drawings, specifications, or otherdata is not to be regarded by implication or other-wise as in any manner licensing the holder or anyother person or corporation, or conveying any rightsor permission to manufacture, use or sell anypatented invention that may in any way be relatedthereto.

Jxly 5t 1962

QUARTERLY REPOMT

Prepared On

C0•RACOT NO. NObar 81262

Prep:Grcd For

BUREAU OF SHIPSDapartmu,,n. of the Navy

Washington 25, D. C.

491.-oi

Prepared By

APPLIED RESEARCH INC.76 South Bayles AvonuoPort Washingtonp N. Y.

I

TABLE OF ,CONTENTS

S~Section

1.0 - ABSTRACT 1

[2.0 - PURPOSE FOR THE DEVELOPMENT 2

3.0 - TECHNICAL PERSONNEL ENGAGED IN THE PROGRAM AND -MAN HOURS 3

4.0 - DESCRIPTION OF WORK

500 - PROGRAM FOR THE NEXT THREE MONTH INTERVAL 9

11II[T

[

I[[

V

LIST OF ILLUSTRATIONS

Fixure Description

1 Block Diagram RF Signal Surveillance System Envelope

S2 Partial Schematic of Lin-log Amplifier 10

L 3 Schematic 475/775 MC Converter 11

w 4 Passive Network Matrix 12

5 Block Diagram of Control and Shaping Circuitry 13

S6 Schematic 405.2 MC Oscillator 14

7 Schematic Strip Line Local Oscillator Unit IA7AI3 15

8 Schematic 775 MC/30 MC Converter 16

9 Schematic Low Pass Filter 17

[ 10 Schematic E-2(A)775/6 Amplifier Unit lA7A1 & 1A7A4 Envelope

S11 Schematic HFW-C(A)4070-775/15 Converter Unit 1A5A2 Envelope

12 Schematic UH-C(A)701OO-475/15 Converter Unit IA6A2 Envelope

13 Spectroscope Project Performance and Schedule Chart 18

[=7Li ii

ii__ _

1.0 ABSTRACT,

1.10 This report covers the work done on the development of an 7r

Spectroscope in the range from 100 MC to 1000 MC for the three

month period from February 1, 1962 to April 30, 1962. It deals

Ii with the following subjects:

1.11 Purpose for the development.

1.12 Names of technical personnel engaged in the development

program, together with a summary of the wm' hours work

performed by each.

El 1.13 A description of the work done during the period frda

1.14 A project performance and schedule chart is included.

S1.15 Program for the next three month interval.

'LiILIc

11'1

S20 PURPOSE FOR THE DEVELOPMENT

2.10 The RF Spectroscope shall be developed for the visual display of

amplitude and frequency of RF signals in the frequency range of

1oo MC to 1000 MC.

f2.20 The frequency range of 100 MC to 1000 MC shall be displayed inI four swept bands on a 5" osoilloscope screen.

2.30 The spectroscope shall have sweep coverage up to 300 MC e10c-

tronically with high resolution, with no spurious responses and

no internally generated interference.

2.40 It shall be useful as a search receiver, spectrum ana'lyser,-no~se

interference. analyzer' or as monitoring equipment.

[2 °I. ".. ..'ii , •

• i . "S1 *

.i... :

ii:S-2-

I3.0 TECHNICAL PERSONNEL ENGAGED IN THE PROGRAM AND MAN HOURS

3.10 The following is a list of technical personnel engaged in'the do-

velopment of the spectroscope together with the total number of

hours spent by each during the period from February 1, 1962' to

April 30, 1962.Total Hours

Martin Heller 458.75'

[ Leonard Pollachek 169925

Earl Morrison 191.75

Frank Sokolski 341.50

I'Charles Copp 2.1.00

Joseph Fazzino 67.50.

Daniel Smoley 16.50

Harry Brown 10.75

Al Kennard 57.95

-1,334.25

I-

I,

4.0 DESCRIPTION OF WORK

4.10 During the period covered by this report the following tasks

have been undertaken.

4.21 A survey of the scope of work required to complete the de.-

velopment of the spectroscope was firmed up. It was decided

that the spectrosoope would comprise the following packages:

4.11.1 The Control Package - This package includes all

1 switohing and control funotions such as channel and

band selectivity and RF and IF signal attenuators.

SA metering facility fot self-'hecking and tro'uble-

shooting is'provided. All sweep functions are oon-

trolled, including dispersion, under frequency and

11 sweep rate. Power awitching and overload protection'

are included in this paokage4

S4.11.2 The RF Heads - Each RF head consists of a bandpaes

filter, RF preamplifier, converter, post amplifier

07) and self-contained power 1oak. The four B?

F units encompass the. range from 100 MC to 1000 MC

in the following steps:

SUnit 1A3 - 100 MC to 200HMC

Unit 1A - 200 MC to 400 MC

.Unit -A5, - 400 *MC to -700 MC

I Unit 1A6 - 700 MC to 1000 MC

4.1.1.3. The Pwer Suvl Pc -This package contains this-

pow er supplied to all cirouitry not i-,cluded, In the

RF heads.

4.11.4 Te Sesmi oscillator+ Poka, +- tUs package contais

I .- 4.-

ii

the two sweep local oscillators encompassing the

sweep span from 875 KC to 1475 MC in two ranges

as follows:

Unit 1A2Al - 875 MC to 1175 MC

Unit 1A2A2 - 1175 MC to 1475 XC

In addition, the paokage contains coaxial switches

for selecting the desired sweep range.

4.11.5 ITe IF Amplifier Packa&e - This package includes two

IF amplifiers, IF bandpass filters, the !in-log amp-

I lifier, the power IF amplifier, linear detector and

video output stage.

4.11.6 A block diagram of the unit is shown in Figure 11,

7" IDwg. No. R700458.

4.12 A paper design of a lin-log amplifier was nearly o6mpleted

during this period. The unit combines logarithmic and . "

linear amplification in a single amplifier. A. solector*"

switch on the control panel will *nable the choice of.'"

either function. The logarithmio response is obtained by"

a feedback arrangement which controls the conduction of.

U diodes shunting the plate circuits of the IF amplifier.' A

video detector followed by a DC- coupled transistori:zed video °

amplifier develops the control voltage for the plate load-

ing diodes. For linear amplification, the video amplifier

is disabled while the loading diodes are slightly back

biased so that they cannot load the interstage networks.

In this mode, the amplifier has a linear response. A par-

2, Dwg. HO. B600760.

[ _ __

4.13 During this period, work was performed in trying to Improve

i the tarbility of the 1250 MC oscillator in the.4?75 to 775 KC

Sconverter. The oscillator tank cirouit •comprises a strip elne

which in inherently stable and rugged. The unit was paper de-

signed, breadboarded and aligned, A partial schematic diagram

of the ugit is shown in Figure 3, Dwg. No. B600784..

S4.14 Circuitry was designed and breadboarded to improve frequency

linearity versus sweep voltage for the varactor swept oaciL-

lators. The sweep voltage is fed to a passive network matrix

which combines the sweep with the DC center frequency voltage.

* The combined output is amplified and fed to shaping circuitry

"'.Ei. which properly shapes the sweep voltage, to give the desired

linearity. The passive network matrix shown in Figure 4, Dwg.'

. .e. 600759, combines the DC center. frequency voltage and the

.1: sweep voltage in such a way as to. maintain the correct balance

"between these two to permit proper shaping while varying the

S...setting of the dispersion control. The, shaped sweep voltage

is then fed to a difference amplifier, tho output of which Is

l .. applied to the varactor of the sweep oscillator. Figure 5,,

SDwg:. No. A700464 , is a block diagram of the control and shaping

.+. circuitry.

S4.15 A 402.5 MC oscillator with dua~l output was' designed and bread-

boarded during this period. Each. of the "dual, outputs feods a

converter. One converter transla.tes the 17ý MG IF, signal to

30 MC. The other cdnverts the 30 NC signal back to 775' 1C4.

The 775 MC reoonverted signal is then fed to the lin-log ams+

lifier.. Either a 5 rC crystal filter paor 5 25 £(C crystal fil-

-ter, each centered at 30 NCI, is interposed between thei. 775 1C

-.6

to 30 MC converter and the 30 MC to 775 MC convertor to ob-

I tain the greatest resolving capability of the spectroscope.

The second harmonic of the 402.5 MC dual output oscillator,

or 805 MC, is used as the injection frequency to convert the

775 MC signal to 30 MC and then the 30 MC signal back to 775

MC respectively. Since the oscillator feeds both converters,

the intention is to isolate the two oscillator outputs from

one another at the signal frequency of 775 MC. This is ac-

complished by using a low •ass filter at each of the two out-

i puts of the oscillator which passes 402.5 MC and rejects 775

MC. Figure 6, Dwv. No. B600783, is a schematic diagram of

Sthe original 402.5 MC oscillator. Figure 7, Dwg. No. A600812,

is the improved version of the same 402.5 NC oscillator.

S4.16 The 775 MC to 30 MC converter has been paper designed and

P breadboarded during this period. It consists of a single

grounded grid mixer using tube type 7784, a "pi" soeption at

the input matched at 775 MC and a "pi" section at the output

matched at 30 MC. The second harminia of 402.5 10C, or 805 MC,

[1 is generated at the input of the type 7784 tube due. to its

Snon-linearity. Figure 8, Dwg. No. B600782, is a schematic

diagram of the converter.

4-.17 A low pass filter has been papr designed. It has a :rejection

of better than 60 DB at 775 MC. Two of these will be usoe qn

I either side of the 402.5 MC oscillator, .as discussed inpara

graph 4.15. A schematic diagram of the unit to shown in Figure:

9, Dwg. No. 3600781.

*1.8 The following units have been completed by engineering and re-

leased for fabrication during this period:

-7

A. One LP..HP Bandpass Filter, 100-200 MC, Unit 1A3Al.

B. One LP-EP Bandpass Filter, 200-400 MC, Unit UkAL.

C. One LP-HP Bandpass Filter, ,00-700 MC,, Unit lA5A1,

D. One LP64P Bandpase Filter, 700-1000 MC, Unit 1A6Al.

N. Two 775 MC IF Amplifiers, Figure 10, Dwg. No. %W750r.

F. One 400-700 MC/775 MC Amplifier/Converter in the 400 to

-. 700 MC RF head, Figure 11, Dwg. No. D600747'

G. One 700-1000 MC/475 MC'Amplifier Converter in the 700 to

1000 MC RP head, Figure. 12, Dwg. N-..D6007,•4

4.19 A project performance and schedule chart is. given in Figure

1-3, Dwg. o.. SF-138.

'ii

H-8

5.0 PROGRAM FOR THE NEXT THREE MONTE INTERVAL

5.10 During the next interval, it is hoped that the following tasks will

Fr 'be compl~eted.

*5.11 The power supplies, oscilloscope and oryst~al filters wil1 be

ordered and delivered to the laboratory.

5.12 All individual units will be fabridated.

5.13 The. cabinet will be ordered and d'elivered to 'the laboratory.

.5.114 The assembly of the total system will be completedi.

[1v

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