February 2001
Part No. 001-9800-001

6-15

C578
.01uF
R546
42.2k
R550
12.1k
C576
100
C575
.01uF
R539
100k
R544
10
R549
7.5k C577
10uF
R545
17.8k
C564
10uF
R541
100k
R525
47k
510
10k
R518
47k
R520
47k
5.5V REGULATOR
CTRL
V OUT
FDBK
VIN
8V
C574
100
R542
100
+
+
UNSW BAT
VOUTVIN
1
U501
MC78M08
GND
6
2
15
4
3
CR505
CR507
R543
1k
UNSW BAT
(FROM PA BD)
CR506
R548
54.9k
8V REGULATOR
8V
R800
20k
R803
20k
R806
20k
R809
20k
R812
20k
R814
20k
R816
20k
R801
20k
R802
10k
R805
10k
R808
10k
R811
10k
R813
10k
R815
10k
C501
100
R513
220k
CR503
U801
MC14094 4
5
6
7
14
13
12
16
15
8
Q1
Q0
Q2
Q3
Q4
Q5
Q6
1
3
2
10
Q7
STR
CLK
DATA
QS
VCC
OE
GND T/R
SHIFT REGISTER
(D/A CONVERTER)
2
3+
–
U500A
LM2904
8
4
1
UNSW BAT
C503
.01uF
R522
4.7k
R521
4.7k SOURCE
8V TX
C552
13 R535
1.5k
R531
10k
R810
4.7k
R821
0
R807
4.7k
R834
12k
R840
10k
C820
100
C825
1uF
R826
10k
R841
10k
R850
100
C828
.01uF
C829
100
+
+
–
U803
LM2904
5.5V
8
4
1
2
3
C809
150
5.5V
14
1
15
16
17
RF OUT
GND
GND
GND
GND
VCC
MOD IN
GND
GND
GND
8
7
18
19
20
U806
REF OSCILLATOR
14.850 MHz
L501
3T
8V
2
1
C513
100
C561
470uF C562
.01uF
C563
100 C560
10uF
+
+
+
–
U500B
LM2904 R512
1k
R515
10k
C504
0.1uF
C500
.1uF
R501
10k
C502
100
5
6
7
CR500
R517
120
R511
680
8V
F500
4A
SOURCE
UNSW BAT
6
R519
1k
R516
1.2k
R504
10k
C505
.01uF
SW BAT
Q501
7013
R500
2.2k
R506
10k

EXCITER

POWER CONTROL

CURRENT
SENSE
AMP
FIRST AMP
R804
4.7k
R822
10k
R820
0
C832
.01uF
C819
1uF
R828
0C830
.01uF
C833
100 C834
.22uF
R845
10 R846
5.6k
C835
.01uF
R848
18k
C836
.0047uF
C840
.01uF R854
10k
R852
1k
C838
4.7uF
R851
47k
C839
100
R853
10k
R838
24k
C821
.001uF C816
.001uF
C122
100
L103
150nH
C841
0.001uF
C842
3.9
R855
150
C120
100
R113
47k
C116
1
15
7
20
19
8
2
3
1
RF
RN
GND
GND
PHP
PHI
RF IN
RF IN
17
16
4
12
14
13
5
6
VCC
VCC
VCC
TEST
REF IN
DATA
STROBE
CLK
LOCK
R831
100
C815
.01uF
+
5.5V
U804
SA7025
SYNTHESIZER
R507
1k
UNSW
BAT
C118
9.1 C115
12
R112
12k
L102
150nH
C112
5.6
C119
10
C113
3.0
R107
8.2k
R110
10k R111
270 C114
100
R114
330
C102
2.0
L101
3
4
5.5V
C570
100
C569
.01uF
+
C565
470uF
C108
33
Q502
3658
Q514
1300
Q516
1300
Q507
3658
8V
5
7
J501
2
3
+C568
4.7uF
SOURCE
8V
SUPPLY SWITCHING
U502
TK11900
SOURCE
5.5V
9
C201
33
CR200
R200
1k
CR203
Q201
3636
R208
4.7k
21
1
17
20
18
19
9
5
3
4
2
23
22
24
11
14
12
6
8
7
15
10
16
DGND
GND4
GND3
GND2
GND1
A2
W2
B2
A1
W1
B1
CS
CLK
SDI VCC
SHDN
RS
A4
W4
B4
A3
W3
B3
5
2
3
U802
AD8403
R824
0
R819
0
5.5V
R818
10k R817
10k
R829
4.7k R823
33k

SYNTHESIZER

DIGITAL POTENTIOMETER
8V TX
BANDPASS FILTER
C227
22
R223
4.7k
C222
.01uF
R206
3.9k
Q200
3612
R205
1k
R207
100
C223
.01uF
R209
470
C224
100
8V
C226
100
C225
.01uF
BANDPASS FILTER
C258
.01uF
R222
3.3k
Q203
3612
R221
1k
R220
100
8V
C259
100
Q204
3636
L210
22uH
R224
1k
C260
9.1
C261
9.1 R225
270
R226
18
R227
270
C252
150
C266
27
C268
150 C269
5.6 C270
22 R228
8.2k
R245
680
R246
390
R244
15k
C283
.01uF L219
.22uH
Q207
3634
R248
180 C286
.01uF
C287
47
C288
7.5
C284
.01uF
C290
36
R249
47
R250
390
R251
100
R231
4.7k
R232
4.7k
C275
.01uF
R835
100
C823
.01uF C824
100
C811
.01uF C812
100 C104
100
L105
150nH
C109
100
L106
150nH
R825
100
R827
4.7k Q800
1300
C807
.01uF C808
100

RECEIVER

45 MHz CRYSTAL FILTER
Z204A
C271
27
C272
.01uF
Z204B
C285
.01uF
R247
4.7k
R243
10
8V
L217
.27uH
8V
8V
Q206
3616
Q205
3616 C277
.01uF
TRIPLER
2
10
1
3Q4
Q1
Q0
CLK
STROBE
QS
DATA
Q2
Q3
Q5
Q6
Q7
4
5
6
7
14
13
12
11
U800
14094
5.5V 16
15
8
VCC
OE
GND
+
C814
4.7uF
CR800
5.5V
15
4
3
5
6
7
W100
W110
W112
W113
W114
W115
5V In
C Shift 1
C Shift 2
Mod In
N/C
Control
CR101
2.1-18.7
CR105
R229
0
C274
.001uF
R254
2.2k
R253
3.3k
C298
.01uF
C293
.01uF
C295
.1uF
+
C294
47uF
R252
100
C301
10
C278
.01uF C282
.01uF
C299
.01uF C300
.01uF C296
.01uF C297
.01uF
R255
56k
R256
27k
R258
10k
C303
0.33uF C305
100
R259
330
C302
.01uF
C281
.01uF
CR207
R237
20k
CR209
R239
510
R238
20k
C276
.01uF C289
.01uF C291
.01uF
R241
20k
R240
510
CR210
CR208
R242
20k
R108
10k
R109
10
C106
100
R100
100
C101
100
Q100
3651
R101
6.8k
L100
18nH R102
470 R839
39
C822
100
R833
15k
Q801
3636
C817
100
C813
.01uF
R830
100
C818
9.1
C827
9.1
Z205
450 kHz CERAMIC
FILTER
W202
5.5V
L218
1
2
420181312191715
8101161416
9
5
7
IF AMP
OUT LIM INVCC
RF IN +
RF IN –
OSCE IF AMP
IN
MIXER
OUT LIM 2 LIM 1 IF 2 IF 1 GND RSSI
OUT
RSSI FB
AUDIO FB
AUDIO
OUT
QUAD
IN
LIM
OUT
U201
SA676
SECOND MIXER/
DETECTOR
WIDEBAND
NARROWBAND
Z202
W111
W109
W101
W103
W102
W104
W105
W106
W107
W108
RF OUT
RF OUT
8V
BUFFER AMPLIFIER

A900 VCO MODULE

BUFFER AMPLIFIER
VCO
20
19
C306
100
C304
.01uF
Rx Audio Out
RSSI Out
PART OF
J201
11
8V
8V Out
C567
100
10
Sw Bat Out
C566
100
SW BAT
4
Unsw Bat Out
C571
100
UNSW BAT
R538
510
6
7
8
TO J302 ON
AUDIO/LOGIC
BOARD
450 kHz FILTERS
PART OF
J201
TO J302 ON
AUDIO/LOGIC
BOARD
17
18
1
12
13
14
16
15
2
3
5
SHIFT
REGISTER
R524
47k
2
3
4
6
4
1
3
1
2
3
4
3256
W201
ALL RESISTORS ARE IN OHMS AND ALL CAPACITORS
ARE IN PICOFARADS UNLESS OTHERWISE SPECIFIED.
1.
NOTES:
1
2
8
9
10
11
12
13
14
16
CR103
R547
10k
CR504
5.1V
Tx On
On-Off Ctrl
Temperature
Transmit (Delayed PTT)
Lock Detect
Tx Wideband Data In
Data In
Clock In
RF Strobe In
Synth Strobe In
Tx Audio In
Tx Data In
Q101
3651
Q102
3651
+
AUX IN
10
18
11
Q503
3612
Q505
3658 Q504
3658
R523
10k
Q508
3658
SOURCE
SW BAT
R540
100k
Q513
2057
Q515
6027
Q517
3612
Q506
3612
Q509
3618
8V TX SWITCH
BYPASS
+
C573
4.7uF
GND
SUMMING
AMPLIFIER
R508
10k
R502
10k
Q500
1300
R509
10k
R505
10k
SW BAT
C572
100
DATA
SYNTH STROBE
CLOCK
C837
.01uF
L802
39nH
C502
CR501
5.5V
C805
100
C810
100
C803
100
C800
100
C512
100
C507
100
C801
100
C802
100
C804
100
C506
100
C509
100
C508
100
C111
2.4
C110
4.3
C124
1
R849
470k
+
C831
1uF
CR104
R103
1k
C103
5.1
R836
18
L800
22nH
R837
68
R847
18
L801
12nH
R844
1k
CR801
C826
6.8
R843
150
R842
150
R856
82
R832
1k
C105
100
C100
100
C107
100 R105
390
C123
100
CR106 L107
150nH
L202
15nH
C221
6.8
C220
100
C215
5.6
R257
62k
C292
.01uF
L203
12nH
CR206
L209
12nH
C255
100
C256
6.8
C262
3.3 C264
7.5
L211
12nH
C263
2.7
C251
18
R218
10k
L208
.68uH
R219
100 C253
0.01uF
R217
47k
R216
390
C246
3.9
Q202
6234
8V
C247
0.01uF C249
.01uF
L220
27nH
L207
15nH
R214
330
C245
8.2
C243
4.3
R215
10k
C242
6.8
L206
0.3nH
C244
10 C238
3.3
CR205
R213
10k
C240
3.3
C239
1.8
R212
10k
C230
100
R211
10k
C233
1.8
CR204
C232
3.3
R210
10k
C241
22
F1
F2
F1
F2
C229
100
L204
0.3nH
C231
3.0 C237
10
C236
22
L205
47nH
C202
100 C204
6.8
C235
6.8
L201
0.3nH
C217
2.7 C216
6.8
CR202
R204
10k
C219
1.5
C218
3.3
R203
10k
C210
100
R202
10k
C208
3.3
CR201
C207
1.8
R201
10k
C213
47
F2
C209
100
L200
0.3nH
C206
2.7 C211
6.8
C205
47
C203
5.6
C212
2.2
F1
C214
6.8
RF AMP
8
Q510
3618
L502
3T
SECOND
AMP
6.3
6.8
1.1
6.8
.7
0 (RX)
7.9
1.4
0
.4
6.1
5.6
1.3
6.1
.7
7.9
1.7
1.0
0.6V P-P
6.6 (WB)
0 (NB)
0 (WB)
6.1 (NB)
0.1V P-P WITH -30dBm
INJECTED AT ANT JACK
0.1V P-P WITH -47dBm
INJECTED AT ANT JACK
0.3V P-P WITH -47dBm
INJECTED AT ANT JACK
5.2 2.9V DC
0.1V P-P WITH -47dBm
INJECTED AT ANT JACK
< 0.6V DC WITH
NO RF SIGNAL
14.850 MHz
400mV rms
5.6
4.7
410mV rms
(430MHz, TX)
1.5-5.2V DC
.7
6.6
8V (RX)
3-10 TX
0 RX
1.4-5.0 TX
0 RX
11.6 TX
13 RX
2-6 TX
0.3 RX
2-6 TX
0.3 RX
1-5 (TX)
12.9
0.6 (OFF)
4.7
.1 (OFF)
9.1
13.3 (OFF)
4.3
4.0 (OFF)
12.8
13.4 (OFF)
13.8
8.7
12.9 (OFF)
7.9
12.9 (OFF)
7.2
13.7 (OFF)
R604
100
R611
4.7k
C640
47
C649
68 C648
100
CR602 R605
330
C601
470 C600
.01uF
Unsw Bat
Out
C602
68
C653
68
HARMONIC FILTER
R603
220k
ANTENNA
JACK
J601
R607
100k
CR600

25W POWER AMPLIFIER BOARD

C611
68
W501
C604
68 C603
.01uF
R601
10k
Current Sense
Temperature
T/R
Forward Power
UNSW BAT
FINAL AMP
J600
ANTENNA SWITCH
Q602
3658
J603
+
–
A600
R610
100
R609
100 R608
220k
CR603
C652
30
R606
68k
C614
100 C625
2.7
C620
2.7
L603
3T
C622
3.3 C623
3.3 C624
3.3
L604
3T
C618
4.3 C626
4.3 C619
4.3 C628
3C629
3C630
1.5
L602
4T
C609
4.7 C642
4.7 C646
27
C627
47
C616
47
DIRECTIONAL
COUPLER
RX RF OUT
EP
L607
6T
EP602
R613
470
Q601
4402
C615
47 C638
47
C617
47
L601
4T
C612
.01uF C613
100
EP
EP601 C608
100 +C607
6.8uF
R600
.03
C637
12 C634
2.7 C635
2.7
POWER
JACK
CURRENT SENSE
UNSW BAT
R602
220k
CR601
.4 TX
13.6 RX
.7 TX
0 RX
SUPPLY V MINUS .24V
C540
100pF
L503
2T
C550
13 C551
13
L504
1T
C526
.01uF
C527
100
C523
.01uF
C521
100
R529
68
C541
16
C555
5.1 C556
5.1 R536
1.2k
R533
10k
C542
10
J502
C537
100
C546
12
C532
12
L500
6T
C545
12
C535
12
Q512
2070
C554
39
C536
39
R537
51
C547
12
C533
12 C548
5.1 C579
7.5
C549
7.5
C539
12
C538
12
C559
12
C558
10
R534
33
Q511
6450
C543
100
L505
2T C544
100
EP
L506
9T
EP2
C531
100
R532
15
C529
.01uF
C528
100
C520
100
C519
.01uF
C511
6.8uF
C510
100 EP1
EP
C524
100 C525
.01uF
EP
C514
10uF C515
0.1uF
+
R528
10k
C517
.01uF R527
5k
C516
100
C530
.01uF
R530
68
C522
.01uF
C518
100
EP3
PREDRIVER
THIRD AMP
W500
C557
2.0
L606
C643
2.7
C655
3.0
C651
2.2
C650
12
C248
0.01uF
R233
22k
C228
8.2 C234
4.3 C307
3.9 L213
0.68uH L215
0.68uH
R234
22k
Z206
R526
3.3k
FIRST MIXER
FIRST INJECTION AMP
FILTER
SELECT
RF BOARD SCHEMATIC (REVISED 430-470 MHZ) PA BOARD SCHEMATIC (25W, 430-470 MHZ)