t1 mod transformer meter sheet: of thai · pdf filethe frequencies for transmitter ... the vco...
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56
D C AB
C
LTR
RF
GAIN
RF
ATTEN
D2,3
RF
AM
P
Q1
1st
MIX
ER
Q3,4
10.6
95 M
HZ
RF
AM
P
Q5
2nd M
IXER
AG
C C
TRL
U1
U1
AM
AM
PAM
DET
FM L
IMIT
FM D
ET
AU
DIO
AM
/FM
SW
D4,5
SQ
CTRL
AF
VO
LUM
E
AU
DIO
AM
P
U6
AM
MO
D
ALC
AM
/FM
CTRL
LPF
RF
AM
P
Q65
DRIV
ER
Q43
PRE D
RIV
E
Q42
DO
UBLE
R
Q40
TX I
NH
Q505
LO/D
X G
AIN
MID
LAN
D 2
48XL
MU
LTI
BLO
CK D
IAG
RAM
TH
AI
RAD
IO C
OM
PAN
Y
CH
UTCH
AW
AL
P.
U1
TK10931
8 8
LCD
DIS
PLA
Y
CLO
CK
X901
REG
U7
TX/R
X S
W
P H
I/LO
REG
EEPR
OM
IC9
PLL
IC 6
VCO
Q503
BU
FFER
Q504
IC 1
01
CPU
MIC
AM
P
U5
MIC
GAIN
FM D
EV
RV501
CF2
SW
201
TX S
-METER
SQ
CTRL
SQ
CTRL
RX S
-METER
LOCK
DWF
CH
9
SCAN
ESP
AM
/FM
AN
T
AN
T
Q25
AM
/FM
CTRL
NO
ISE B
LAN
K
Q29,Q
30,D
13-1
5
CF1
EXT S
PK
PA
SPK
EXT S
-METER
METER
X1
10.2
4M
Hz
455K
T1
MO
D T
RAN
SFO
RM
ER
X401
4.5
MH
Z
MIC
RO
PHO
NE
A
B
B
B+
midland 248xl multi 29JUNE09.sch-1 - Mon Jun 29 11:43:14 2009
MIDLAND 248XL MULTI CIRCUIT DESCRIPTION INTRODUCTION 1.Multi BAND:Italy,Italy-34CH, Germany-80CH, Germany,Germany-80CH-40CH-4W Spain, Europe, CEPT, England, England-CEPT, Poland ,Poland-400CH, Russia-400CH ,France,Sweden 2. BLUE COLOR DISPLAY 3 . THE FREQUENCIES FOR TRANSMITTER AND RECEIVER LOCAL FREQUENCIES ARE ALL DRIVEN FROM A SINGLE 10.240MHz CRYSTAL (X1) BY MEANS OF A PHASE LOCKED LOOP. THE FIRST LOCAL OSCILLATOR FREQUENCIES ARE 14.915MHz(Poland-400CHCH.1) TO 20.875MHz(Sweden CH.24) FOR RECEIVER. THE SECOND LOCAL FREQUENCY IS FIXED AT 10.240MHz(X1) TO GENERATE SECOND IF 455KHz. DURING TRANSMIT, THE VCO OF THE PLL OPERATES 12.805MHz TO 15.785MHz.
TO MCU IC PIN 9 Q503 Q504 Q505 Q507 D503 D504
VCO
Q506 BUFFER
RX LOCAL FREQUENCY : 14.915MHz(Poland-400CH CH.1) TO 20.875MHz (Sweden CH. 24) TX FREQUENCY : 12.805MHz TO 15.785MHz THE VCO OPERATING FREQUENCY FOR THE RECEIVER IS 14.915MHz (Poland-400CH CH. 1) TO 12 .805MHz (Sweden CH. 24 ) AS THE FIRST LOCAL OSCILLATOR, INJECTED THROUGH THE BUFFER AMP Q506 INTO THE FIRST TR MIXER Q3,Q4
DESCRIPTIONS OF EACH BLOCK INTRODUCTION THE SYNTHESIZER IS IMPLEMENTED WITH THE FOLLOWING COMPONENTS : PLL (IC6), CRYSTAL(X401) VCO, VARICAP DIODE(D503,D504)
THE IC 6 IS A HIGH PERFORMANCE DUAL FREQUENCY SYNTHESIZER WITH TWO INTEGRATED HIGH FREQUENCY PRE-SCALARS FOR RF OPERATION
THE Q503,Q504,Q505-507,L401,C314,D503,D504,C522,C511,C512 ARE CLAP OSCILLATOR CIRCUIT TO OPERATE AS A VCO OF THE IC6. THE Q505 IS A SWITCHING DIODE TO CONNECT OR DISCONNECT THE TUNING CAPACITOR IN THE VCO OSCILLATOR TANK CIRCUIT FOR TRANSMITTER OR RECEIVER. THE Q506 WORKS AS A BUFFER AMP FOR RX LOCAL FREQUENCIES AND TX CARRIER GENERATING FREQUENCIES. THE D503-504 IS A SWITCHING DIODE TO CONNECT OR DISCONNECT THE TUNING CAPACITOR IN THE VCO OSCILLATOR TANK CIRCUIT FOR BAND SELECT. REFERENCE FREQUENCY (CRYSTAL)
THE CRYSTAL, X401(4.5MHZ) AND OTHER COMPONENTS AS PIN.14 OF IC6 AND IC101 CAN MAKE A REFERENCE FREQUENCY OSCILLATOR WITH CK (Pin8), DATA (Pin9), EN (Pin7) TERMINALS IN IC103 ARE USED FOR MCU SERIAL DATA INTERFACE . THIS SET IS USED EXTERNAL CLOCK SOURCE BY THE CRYSTAL. THE REF_FREQUENCY(4.5MHz) IS ADJUSTED BY CT401 EXACTLY. VCO THE Q503 , Q 5 0 4 AND SURROUNDING PARTS ARE CONSISTING A CLAPP OSCILLATOR WORKS AS A VCO OF I C 6 WITH APPROPRIATE CONTROL VOLTAGE ON D301.THE VCO CAN BE OSCILLATE OVER THE REQUIRES RANGE OF 12.805MHz TO 20.875MHz . PHASE DETECTOR AND VCO CONTROL THE PHASE DETECTOR IS A DIGITAL PHASE COMPARATOR WHICH COMPARES THE PHASE OF THE REFERENCE SIGNAL WITH PROGRAMMABLE DIVIDER OUTPUT SQUARE WAVES AND DEVELOPS A SERIES OF PULSE WHOSE DC LEVEL DEPENDS ON THE PHASE ERROR OF EACH SIGNAL. THE PHASE DETECTOR PULSE OUTPUT IS FED TO AN ACTIVE LOW PASS FILTER, AND FED TO VARICAP D503-504 CONTROL THE VCO FREQUENCY.
SWITCHING OF TUNING CAPACITOR IN VCO THE VCO CIRCUIT MUST USE WITH A WIDE RANGE OF FREQUENCIES 12.805MHz TO 15.785MHz FOR TRANSMITTER AND 14.915MHz(CH.1) TO 20.875MHz FOR RECEIVER. TO COMPLY ABOVE RANGE OF VCO, THE TUNING CAPACITANCE SHOULD SWITCHED FOR TRANSMISSION OR RECEPTION. THE TUNING CIRCUIT CONSISTS WITH C 5 2 2 ,Q 5 0 5 WHEN THE VCO IS WORKING AS A RECEIVER, WHEN TRANSMITTING MODE, C 5 2 2 ,Q 5 0 5 BECOMES TURN ON. WHEN RECEIVING MODE, C522, Q505 BECOMES OFF,L401 AND THE D503-504 CAPACITANCE OF MAKE TUNING FUNCTION. RECEIVER LOCAL OSCILLATOR OUTPUTS 1ST MIXER : THE OUTPUT SINGLES OF Q503 IS INJECTED TO THE SOURCES OF 1ST MIXER Q3,Q4 IN THE 1ST IF MIXER SECTION. 2ND MIXER : THE OUTPUT OF 10.240MHz OSCILLATOR CIRCUIT WITH X1 IS INJECTED INTO THE U1. INCOMING IF SIGNAL AND 10.695MHz SIGNAL ARE MIXED INSIDE THE U1 TO EXTRACT 2ND IF SIGNAL 455 KHz. DESCRIPTION OF OTHER CIRCUITS TRANSMITTER RF AMPLIFICATION THE OUTPUT OF BUFFER AMP Q40 IS FED THROUGH TUNING C525,L10,L11 TO THE BASE OF PRE DRIVER AMP Q42N. THE PRE DRIVER AMP OUTPUT SIGNAL FED THROUGH TO DRIVER AMP(Q43), FED THROUGH TO POWER AMP(Q65) TO THE ANTENNA. CIRCUIT FOR SUPPRESSION OF SPURIOUS RADIATION THE TUNING CIRCUIT BETWEEN THE OUTPUT OF FINAL AMP Q 6 5 AND ANTENNA, 3 STAGE "LPF TYPE" NETWORK L15, L16, L19,L22,L314, C169, CN9, C99, C100,C82,C126,C127,C170,C172,CN7,CN11,R35 SERVES AS A SPURIOUS RADIATION SUPPRESSOR. THIS NETWORK ALSO SPURIOUS RADIATION SUPPRESSOR. THIS NETWORK ALSO SERVES TO MATCH THE IMPEDANCE BETWEEN TX
POWER TR Q65 AND ANTENNA. MAXIMUM MODULATION CONTROL MODULATION SIGNALS ARE FILTERED WITH RC NETWORK AND GOES TO THE AUDIO_AMP IC(U6) TO MAKE NOMINAL SIGNAL LEVEL TO ACHIEVE WANTED MODULATION.TO CONTROL INCOMING AUDIO SIGNAL BY ALC CIRCUIT. THE ALC ARE Q12,D16,RV5 THAT’S CIRCUIT CONTROL MAXIMUM MODULATION CAPABILITY AND MAXIMUM MODULATION LIMITTING. RECEIVER (1) RF AMP Q1 AMPLIFY RF SIGNAL FROM ANTENNA(Q27 Q28 BAND CONTROL), AND THEN THE AMPLIFIED RF SIGNAL IS FED THROUGH MIXER(Q3 Q4) TO THE BASE OF MIXER Q3 Q4, ALSO VCO SOURCE'S FREQUENCY LOWER 10.695MHz THAN THE FREQUENCY OF EACH CHANNEL IS SUPPLIED TO MIXER. (2) THE SOURCE OF 10.695MHz FREQUENCY IS FED THROUGH CF1 TO 2’ND MIXER U1. (3) THE 455 KHZ FREQUENCY SIGNAL IS PRODUCED FROM U1 BY MIXING THE OUTPUT SOURCE OF CF1 10.695MHz FILTER AND THE SOURCE OF 10.24MHz FREQUENCY FROM CRYSTAL OSCILLATOR X1. (4) THE U1 IS IF AMP, AND D4(AM),D5(FM) IS DETECT DIODE. AUDIO SIGNAL RECOVER BY THAT DIODE. THE AUDIO SIGNAL IS FED THROUGH C37 TO AUDIO POWER AMP(U6) FOR DRIVING SPEAKER. (5) Q29,Q30,D13-D15 IS AUTOMATIC NOISE BLANK CIRCUIT
Explode view
Terdsak
00-00000-00
29,Jul,09
MidlandMODEL Midland 248 XL
Thai radio Co.,Ltd.787 M.1, Banlane, A. Bang Pa-InAyutthaya 13160Tel. 035-351-787-9,Fax.035-351-790
SCALE:2:1
SIZE DWG. NO.
AREV.
MATERIAL
FINISH
xxxxx
--
DO NOT SCALE DRAWINGAPPLICATION
USED ONNEXT ASSY
NAME DATE
DRAWN
CHECKED
ENG APPR.
MFG APPR.
Q.A.
SHEET 1 OF 3WEIGHT:
COMMENTS:
DIMENSIONS ARE IN INCHES
TOLERANCES:
FRACTIONAL
ANGULAR: MACH BEND
TWO PLACE DECIMAL
THREE PLACE DECIMAL
NAME&TITLE
CUSTOMER
8
7
19
18
9
10
15
2
131
1711
5
4 12
6
3
20
16
22
Front Explode view
Terdsak
00-00000-00
27,Jan,09
MidlandMODEL Midland 248 XL
Thai radio Co.,Ltd.787 M.1, Banlane, A. Bang Pa-InAyutthaya 13160Tel. 035-351-787-9,Fax.035-351-790
SCALE:2:1
SIZE DWG. NO.
AREV.
MATERIAL
FINISH
xxxxx
--
DO NOT SCALE DRAWINGAPPLICATION
USED ONNEXT ASSY
NAME DATE
DRAWN
CHECKED
ENG APPR.
MFG APPR.
Q.A.
SHEET 2 OF 3WEIGHT:
COMMENTS:
DIMENSIONS ARE IN INCHES
TOLERANCES:
FRACTIONAL
ANGULAR: MACH BEND
TWO PLACE DECIMAL
THREE PLACE DECIMAL
NAME&TITLE
CUSTOMER
ITEMNO.
PART NUMBER DESCRIPTION QTY.
1 86-00006-00 E.S.C ABS 94HB BLKL380-9001
1
2 84-00017-00 LENS LIGHTINGACRYLIC MD001 CLEAR
1
3 83-00013-00 KNOB FUNCTIONSILICONE RUBBER
1
4 84-00010-02 LENS ACRYLIC MD001CLEAR
1
5 83-00007-00 KNOB CH ABS 94HB BLK 1
6 83-00006-00 KNOB CB/PA ABS 94HBL380-9001 BLK
1
7 15-00037-01 CONNECTOR SOCKETN-16-6R(PCB)-1 ASS'Y
1
8 32-00000-11 SW PULSE YPS210125SK25MM
1
9 17-00503-01VR
550KA:0952-25FP-B10KVOL/SQ
1
10 17-01503-01 VR 50KB:0951-25FPMIC/RF GAIN
1
11 83-00022-00 KNOB SQLABS 94HBL380-9001 BLK
2
12 83-00024-00 KNOB VOL ABS 94HBBLK
2
13 60-00009-01(+)MACHINE
SCREW(FH)2.6X5ZN-PLAT
4
15 18-00110-03 P.C.B LCD 149 X 48.2 X1.6 FR4 1/1
1
16 06-00012-41 LCD DISPLAY ISO7167P 1
17 91-00026-02 LED PLATE PC22.8x54.3xT=0.25MM.
1
18 32-00002-11 SW PUSH SPPH221AP011 1
19 11-00001-00 METER E.I (BLUE)H-321-S0221
1
20 32-00002-20SWITCH TACT
5.5x6.0x6.0MM.(SMTTYPE)
7
21 78-00011-00 SPRING(FOR VOL)SUS/4H T0.2
2
22 AssemMic248
1
DETAIL A SCALE 2 : 5
12
20
28
18
11Explode view
Terdsak P.
00-00000-00
29,Jul,09
MidlandMODEL Midland 248XL
Thai radio Co.,Ltd.787 M.1, Banlane, A. Bang Pa-InAyutthaya 13160Tel. 035-351-787-9,Fax.035-351-790
SCALE:2:1
SIZE DWG. NO.
AREV.
MATERIAL
FINISH
xxxxx
--
DO NOT SCALE DRAWINGAPPLICATION
USED ONNEXT ASSY
NAME DATE
DRAWN
CHECKED
ENG APPR.
MFG APPR.
Q.A.
SHEET 3 OF 3WEIGHT:
COMMENTS:
DIMENSIONS ARE IN INCHES
TOLERANCES:
FRACTIONAL
ANGULAR: MACH BEND
TWO PLACE DECIMAL
THREE PLACE DECIMAL
NAME&TITLE
CUSTOMER
ITEM NO. PART NUMBER DESCRIPTION QTY.
1 70-00007-00 MAIN BODY EGI T=1.0 1
2 74-00007-00 bottom cover SPC+VIN.SHT.T0.75BLK(ALA
1
3 74-00006-01 UPPER COVER SECC+VINYLBLACK SHEET T=0.75MM
1
4 82-00014-00 CORD STOPPER PP 1
5 20-00002-00 JACK DC.SLDPRT 2
6 28-00000-00 MOLEX PLUG ASS'Y UL1015 /LENGTH 210MM. PITCH 2.5MM.
1
7 12-00000-83 SPEAKERYD077A008007P(ID)-R0304K
1
8 72-00001-00 HOLDER(SPK)EGI T1 USCOATING 3
9 20-00004-00 JACK MINIATURE FJ-2506 2.5MM 1
10 18-00033-02 P.C.B MAIN 146X153.5X1.6 FR41/1
1
11 03-00019-00 KTB1367 TRANSISTOR 2
12 10-00028-01 IC TDA2003H 5 LEG.SLDPRT 1
13 04-00003-00 RF POWER FET RD16HHF1 1
14 03-00036-00 TRANSISTOR 2SC2314(F) 1
15 90-00006-00 FELT &77XT0.3 1
16 60-00064-02 (M3x6) TAP TITE 4
17 60-00053-02 (M3x6) Tapping screw 4
18 60-00028-01 (M3x10) Machine screw 5
19 62-00004-00 SS41 M3-1S ZN-PLAT 5
20 63-00014-00 WASHER SPRING M3 RoHS ZINC 5
21 63-00007-00 WASHER FIBER ?7x?3.2xT=1.0 RED 1
22 71-00009-00 BRACKET SPC T2 BLK-SPRAY 1
23 60-00003-03 SCREW(SECURING) 2
24 15-00005-01 CH-239(A) SW-1229.SLDPRT 1
25 60-00066-02 (+)TAP TITE SCREW BH 3X4-3S BLK 2
26 26-00001-00 MICA 1
27 85-00014-00 BUSHING 1
28 73-00003-00 HEAT SINK ALP3 13x26xT=2.0 MM. 1
29 63-00002-00 WASHER RUBB.&7X&25XT1.5 BLK 2
30 60-00054-02 (+)TAPPING SCREW(BH) 3X8-2SBLK
3
31 90-00013-00 10X130XT0.5 FELT STIC. 4
32 76-00012-00 SHIELD HOUSING SPTE T0.339.5*53.5*25
1
33 76-00014-00 SHIELD PLATE SPTE T=0.3 40*53 1
34 76-00011-00 SHIELD HOUSING 1
35 76-00047-00 SHIELD PLATE 1
DETAIL B SCALE 2 : 5
14
19
26
21
25
6
33
4
13
24
24
2
1
9
5
23
10
22
3
16
17
29
35
32
34
8
7
15
30
AB