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S100-1 (2)
C154
S100
R194
R191
P100
AUDIO AMPLIFIER
.1
75k
75k
2
15
TXS+ 3
R196
U131C
R265
SECONDARY
300
9
3303
2.2k
AUDIO
8
FROM RNT
10
+
R195
C153
R193
300
.1
75k
3
14
TXS- 4
R192
4
13
75k
C282
R286
.1
75k
HIGH-PASS FILTER > 300 Hz
C151
R188
R187
.1
75k
75k
R314
TXA+ 15
U167B
43.2k
R190
U167A
6
3303
C300
C301
300
3303
2
MAIN
.0056
.0047
1
5
+
AUDIO
3
FROM RNT
+
R189
C152
R186
R315
300
.1
86.5k
75k
TXA- 16
R185
R307
75k
36k
TX VOICE
AMPLIFIER
C304
R269
R306
R305
.1
36k
36k
100k
TX VOICE 32
CR113
U130A
15V
2904
2
1
CR114
V REF EX
3
15V
+
V REF EX 7
+3.5V
U116A-2 (2)
U116B-7 (2)
MAIN AUDIO AMP
3
U117A
U157-19 (1)
1
TX INTCOM
TX INTCOM
GATE
2
R219
180k
U117C
J102
LOCAL MIC
C161
R220
LOCAL MIC
U164A
MUTE
.1
16k
JACK
GATE
2
2904
1
10
11
R285
3
+
2.2k
9
R223
+5V
U106-17 (1)
+5V
6.8k
LOCAL MIC MUTE
R225
Q101
10k
U105-5 (1)
3657
R226
LOCAL MIC
10k
PTT
Q102
3658
R227
10k
CR103
LIMITER
R145
150k
+5V
R144
CR112
1k
2.4V
CR111
R279
C130
470pF
2.4V
150k
U127D
CR104
CR105
R138
R137
3303
13
121k
121k
14
12
+
R280
150k
-5V
-5V
R278
0
C257
+
47
U153D
TXS TO FSK
R264
R242
GATE
100k
10k
15
14
U153A
U131D
16
DATA LEVEL
U107-18 (1)
13
3303
TEST GATE
TXS TO FSK
14
3
2
12
+
1
U107-13 (1)
DATA LEVEL TEST
U116D
R316
25.5k
U167C
TXA TO FSK
R267
R266
R243
GATE
9
3303
C302
C303
2.2k
10k
100k
8
14
.0033
.0039
U116C
7
10
+
U167D
TX AUDIO
R317
2904
GATE
U107-17 (1)
13
TXA TO FSK
909k
14
10
11
12
+
9
U107-15 (1)
R268
TX AUDIO
R244
100k
36k
U153B
U130B
TX NET
GATE
6
2904
7
6
7
5
+
8
U158A
U155-19 (1)
TX VOICE
TX NET
GATE
2
3
1
U107-14 (1)
TX VOICE
HIGH-PASS FILTER > 300 Hz
TX AUDIO BUFFER
C139
R154
R152
R309
.1
43k
22k
R151
25.5k
U127B
43.2k
9
R153
C298
C297
C138
U164B
6
2904
C132
C133
.0033
.0039
.1
43k
2904
6
7
10
.0056
.0047
7
5
+
5
+
R308
R150
909k
86.6k
C131
.0047
LOWPASS FILTER
BUFFERS
U128C
R139
U128B
3303
9
R312
R313
35.7k
U127A
3303
8
2
R310
R311
0
0
3303
2
1
10
0
0
+
1
3
+
3
+
C129
470pF
C232
C170
C171
C172
C173
C174
C175
C176
C177
C269
C270
47
47
.01
.01
.01
.01
.01
.01
.01
.01
.01
+
+
Part No. 001-2009-201
10-33
C156
.1
U110-5 (2)
TO TX FSK
R198
100k
U153C-10 (2) REPEAT GATE
COMPANDOR OPTION A301-5
U158C
U159A
TX OPTION
LEVEL DETECT
GATE
GATE
10
11
2
3
9
1
+5V
U106-19 (1)
U106-18 (1)
LEVEL DETECT
TX OPTION
R298
16
10k
15
15
14
16
U158D
8
OPTION
6
7
WO
WO
U158B
7
100
103
U155-13 (1)
A301-5 (2)
A301-4 (2)
COMPANDOR OPTION
A301
U117B
U126A
TX DATA
2
3303
ENABLE GATE
R202
7
6
1
1M
U111-13 (1)
3
+
8
TX SHAPE
U111-14 (1)
TX DATA EN
R201
R204
270k
47k
U111-12 (1)
TX DATA
CWID
GENERATOR
U100B
U100A
74HC02
R174
C136
CWID CONTROL
5
74HC02
4
2
160k
.0047
U107-12 (1)
6
1
3
C148
R175
U127C
R170
R169
.01
4.3k
3303
1M
54.9k
8
R172
+
10k
-5V
TX AUDIO AMPLIFIER
7
U155-15 (1)
CS
U118A
VH
DIGITAL MOD
R143
R320
MUTE GATE
3
180k
3.3k
2
3
1
U157-14 (1)
LOWPASS FILTERS
R271
DIGITAL MOD MUTE
180k
U118B
C126
C128
.01
U128A
NORMAL MOD MUTE
GATE
.0033
U128D
3303
2
R141
R142
3303
13
1
6
7
R140
22.6k
17.4k
14
3
+
27.4k
12
8
+
C125
U106-15 (1)
680pF
C127
NORMAL MOD MUTE
680pF
C178
C179
C180
C181
C182
C183
C184
C185
C219
C220
.01
.01
.01
.01
.01
.01
.01
.01
.01
.01
October 1999
J103
J100
A-D LEVEL TP
DC RESTORATION
U125A-1 (2)
TX DATA AMPLIFIER
U151
IN
1
CS
U106-13 (1)
X9C10415
C
100k
U/
U111-7 (1)
2
U106-12 (1)
R164
CR100 (2)
D
100k
VH
VW
VL
3
5
C142
.01
R275
U126B
C144
R163
R165
R274
U126C
36k
3303
.047
13
6
100k
36k
47k
R167
3303
7
9
56k
R166 56k
5
8
12
+
V REF EX
C143
10
+
.022
C136
+3.5V
R160
R161
.0068
1.1k
3.01k
C136
R159
R221
R162
C137
100pF
100pF
2.74k
0
18.2k
+5V
R173
430k
U129A
C150
R176
3303
2
.022
6.8k
1
3
+
J106
R171
1
10k
P106
+5V
2
3
P107
4
5
U149
IN
1
U106-13 (1)
X9C10415
C
R158
100k
U/
82k
2
U106-12 (1)
D
+
VW
VL
R157
6
5
82k
C141
.1
C165
R270
39k
360pF
U129C
C140
R155
3303
9
.1
82k
8
10
+
C221
C222
C223
C224
C225
C226
.01
.01
.01
.01
.01
.01
MAIN AUDIO CARD SCHEMATIC (3 OF 3)
P100
28 A-D LEVEL
U159D
U159C
DATA TO A-D
TX MOD A-D
GATE
GATE
10
11
15
14
9
16
U107-16 (1)
U157-16 (1)
DATA TO A-D
TX MOD A-D
U159B
LOGIC SQ A-D
GATE
6
7
8
U157-17 (1)
LOGIC SQ A-D
U126D
3303
14
+
R168
2.2k
R322
0
8 TX DATA OUT
R323
0
9 TX DATA IN
U118D
U129B
TX MOD
R321
3303
MUTE GATE
100
14
15
29 TX MOD
16
R156
U106-14 (1)
82k
TX MOD MUTE
C146
390pF
U118C
EXTERNAL MOD
R218
C160
MUTE GATE
82k
.1
11
10
11 EXTERNAL MOD
9
U106-16 (1)
EXT MOD MUTE
FIGURE10-38
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