Table of Contents
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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
R242
300
3303
9
2.2k
100k
AUDIO
8
FROM RNT
10
+
R195
C153
R193
300
13
.1
75k
3
14
TXS- 4
12
+
R192
4
13
75k
C282
R286
75k
.1
HIGH-PASS FILTER > 300 Hz
C151
R188
R187
.1
75k
75k
R314
TXA+ 15
43.2k
U167B
C302
R190
U167A
6
3303
C300
C301
.0033
300
2
3303
7
.0056
.0047
MAIN
1
5
AUDIO
+
3
FROM RNT
+
R189
C152
R315
R186
300
.1
86.5k
75k
TXA- 16
R185
R307
R244
75k
36k
100k
TX VOICE
6
AMPLIFIER
C304
R269
R306
R305
5
.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
C139
U117C
.1
J102
LOCAL MIC
C161
R220
LOCAL MIC
U130A
MUTE
.1
C138
JACK
16k
2904
GATE
2
.1
1
2
3
R285
3
+
2.2k
1
+5V
R223
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
LOWPASS FILTER
150k
+5V
R144
CR112
1k
2.4V
C130
CR111
R279
2.4V
150k
470pF
U127D
CR104
CR105
2
R138
R137
13
3303
121k
121k
14
3
+
12
+
C129
470pF
R280
150k
-5V
-5V
C232
C257
C269
C270
+
47
+
47
47
+
10-33
U153D
TXS TO FSK
R264
GATE
10k
15
14
U153A
U131D
DATA LEVEL
16
3303
TEST GATE
U107-18 (1)
14
3
2
TXS TO FSK
1
U107-13 (1)
DATA LEVEL TEST
R316
U116D
25.5k
U167C
TXA TO FSK
R267
R266
R243
3303
GATE
C303
9
2.2k
10k
100k
8
14
15
.0039
U116C
10
+
U167B
TX AUDIO
16
R317
6
2904
GATE
U107-17 (1)
909k
7
10
11
TXA TO FSK
5
+
9
U107-15 (1)
R268
TX AUDIO
36k
U153B
TX NET
U130B
GATE
2904
7
7
6
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
R154
R152
R309
43k
22k
R151
U127C
25.5k
43.2k
U127B
3303
9
R153
C298
C297
U164B
2904
C132
C133
6
8
43k
.0056
.0047
2904
6
7
10
.0056
.0047
+
5
7
+
5
+
R308
R150
909k
86.5k
C131
R143
R320
.0047
3.3k
180k
BUFFERS
C128
.0033
U128C
13
R139
R140
U128B
3303
9
R312
R313
35.7k
17.4k
U127A
3303
12
R310
R311
2
8
0
0
3303
1
10
+
0
0
1
3
+
C127
680pF
C170
C171
C172
C173
C174
C175
C176
C177
C178
C179
C180
.01
.01
.01
.01
.01
.01
.01
.01
.01
.01
.01
.01
March 1999
Part No. 001-2009-600
C156
.1
U110-5 (2)
FSK GATE
R198
J103
100k
U153C-10 (2)
REPEAT GATE
J100
A-D LEVEL TP
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
14
U158D
8
OPTION
TX DATA AMPLIFIER
6
7
WO
WO
U151
U158B
7
U155-13 (1)
CS
100
103
X9C10415
100k
A301-5 (2)
A301-4 (2)
VH
VW
3
5
CR124
CR125
6.2V
6.2V
R275
U126B
36k
3303
6
U117B
7
U126A
TX DATA
5
+
V REF EX
3303
ENABLE GATE
2
R202
1
7
6
1M
U111-13 (1)
3
+
R160
8
TX SHAPE
1.1k
U111-14 (1)
TX DATA EN
R201
R204
R159
270k
47k
2.74k
U111-12 (1)
TX DATA
CWID
R173
GENERATOR
430k
U100B
U100A
74HC02
R174
C136
CWID CONTROL
5
U129A
74HC02
4
2
160k
.0047
C150
U107-12 (1)
6
1
3303
2
.022
3
1
C148
R175
3
+
R170
R169
.01
4.3k
1M
54.9k
R172
R171
10k
10k
-5V
+5V
TX AUDIO AMPLIFIER
U149
IN
7
1
U155-15 (1)
CS
X9C10415
C
100k
U/
2
D
U118A
VL
VH
VW
DIGITAL MOD
MUTE GATE
3
5
6
3
2
CR122
CR121
CR123
6.2V
1
6.2V
U157-14 (1)
LOWPASS FILTERS
R271
DIGITAL MOD MUTE
C165
R270
180k
U118B
360pF
39k
C126
NORMAL MOD MUTE
.01
U128A
U128D
3303
GATE
U129C
2
R141
R142
C140
3303
6
7
3303
1
9
22.6k
17.4k
.1
3
14
8
+
8
10
+
+
C125
U106-15 (1)
680pF
NORMAL MOD MUTE
C181
C182
C183
C184
C185
C219
C220
C221
C222
C223
C224
C225
.01
.01
.01
.01
.01
.01
.01
.01
.01
.01
.01
.01
U159C
U159D
DATA TO A-D
TX MOD A-D
GATE
GATE
DC RESTORATION
10
11
14
U125A-1 (2)
9
16
U107-16 (1)
U157-16 (1)
DATA TO A-D
TX MOD A-D
U159B
IN
LOGIC SQ A-D
1
U106-13 (1)
C
GATE
U/
U111-7 (1)
2
6
7
U106-12 (1)
R164
D
CR100 (2)
100k
VL
8
U157-17 (1)
C142
CR126
LOGIC SQ A-D
.01
6.2V
C142
U126D
R274
R163
R165
U126C
.047
3303
13
36k
100k
47k
R167
3303
9
14
56k
R166 56k
8
12
+
C143
10
+
.022
C136
+3.5V
R168
R161
.0068
2.2k
3.01k
R162
18.2k
R176
6.8k
R322
J106
0
1
P106
2
3
R323
0
P107
4
5
U106-13 (1)
R158
U118D
U129B
82k
TX MOD
U106-12 (1)
R321
3303
MUTE GATE
+
100
14
15
R157
82k
16
R156
U106-14 (1)
82k
6.2V
C141
TX MOD MUTE
.1
C146
390pF
U118C
EXTERNAL MOD
R155
R218
C160
MUTE GATE
82k
82k
.1
11
U106-16 (1)
EXT MOD MUTE
C226
.01
MAIN AUDIO CARD SCHEMATIC (3 OF 3)
FIGURE10-38
P100
28 A-D LEVEL
15
8 TX DATA OUT
9 TX DATA IN
29 TX MODE
10
11 EXTERNAL MOD
9
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