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March 1999
Part No. 001-2009-600
10-33
MAIN AUDIO CARD SCHEMATIC (3 OF 3)
FIGURE10-38
TXS+ 3
R196
300
R195
300
S100
2
3
413
14
15
S100-1 (2)
TXS- 4
SECONDARY
AUDIO
FROM RNT
P100
C154
.1
C153
.1
R194
75k
R193
75k
+
U131C
3303
R192
75k
R286
75k
C282
.1
R191
75k
R265
2.2k
R242
100k
+
U131D
3303
9
10
8
14
13
12
R264
10k
U153A
DATA LEVEL
TEST GATE
23
1
U107-13 (1)
DATA LEVEL TEST
U153D
TXS TO FSK
GATE
14
16
U107-18 (1)
TXS TO FSK
15
R190
300
R189
300
C151
.1
C152
.1
R188
75k
R186
75k
+
U167A
3303
R185
75k
R187
75k
2
3
1
TXA+ 15
TXA- 16
MAIN
AUDIO
FROM RNT
C300
.0056
R314
43.2k
C301
.0047
R315
86.5k
+
U167B
3303
6
5
7
C302
.0033
R316
25.5k
C303
.0039
R317
909k
+
U167C
3303
9
10
8
HIGH-PASS FILTER > 300 Hz
R267
2.2k
R243
100k
+
U167B
2904
7
6
5
R266
10k
U116C
TX AUDIO
GATE
1110
9
U107-15 (1)
TX AUDIO
U116D
TXA TO FSK
GATE
15
16
U107-17 (1)
TXA TO FSK
14
C156
.1
R198
100k
U110-5 (2)
FSK GATE
U153C-10 (2)
REPEAT GATE
A301-5 (2) A301-4 (2)
WO
100
WO
103
OPTION
U158B
7
8
6
U158D
14
16
15
R298
10k
+5V
U158C
TX OPTION
GATE
9
1110
U106-18 (1)
TX OPTION
U159A
LEVEL DETECT
GATE
1
32
U106-19 (1)
LEVEL DETECT
A-D LEVEL TP
J100
J103
U159D
TX MOD A-D
GATE
16
1514
U157-16 (1)
TX MOD A-D
U159C
DATA TO A-D
GATE
9
1110
U107-16 (1)
DATA TO A-D
DC RESTORATION
U125A-1 (2)
U159B
LOGIC SQ A-D
GATE
8
76
U157-17 (1)
LOGIC SQ A-D
U111-7 (1)
CR100 (2)
TX VOICE 32
V REF EX 7
+3.5V
V REF EX
C304
.1
CR113
15V
CR114
15V
R269
36k
R305
100k
+
U130A
2904
1
2
3
R306
36k
U158A
TX VOICE
GATE
32
1
R244
100k
+
U130B
2904
7
6
5
R268
36k
R307
36k
U107-14 (1)
TX VOICE
U153B
TX NET
GATE
67
8
U155-19 (1)
TX NET
J102
LOCAL MIC
JACK
R285
2.2k
R223
6.8k
Q101
3657
+5V
R227
10k
R226
10k
Q102
3658
R225
10k
+5V
U105-5 (1)
LOCAL MIC
PTT
C161
.1
R220
16k
+
U130A
2904
1
2
3
R219
180k
U117A
TX INTCOM
GATE
3
1
2
U116A-2 (2)
U116B-7 (2)
MAIN AUDIO AMP
U117C
LOCAL MIC
MUTE
GATE
32
1
U106-17 (1)
LOCAL MIC MUTE
U157-19 (1)
TX INTCOM
C138
.1
R153
43k
+
U164B
2904
7
6
5
R152
22k
C139
.1
R154
43k
C132
.0056
R151
43.2k
C133
.0047
R150
86.5k
+
U127B
2904
7
6
5
R308
909k
C298
.0056
R309
25.5k
C297
.0047
+
U127C
3303
8
9
10
CR112
2.4V
CR111
2.4V
R144
1k
+
U127D
3303
14
13
12
CR103
R279
150k
R280
150k
+5V
-5V
CR104 CR105
R145
150k
R138
121k
TX AUDIO BUFFER
HIGH-PASS FILTER > 300 Hz
TX VOICE
AMPLIFIER
AUDIO AMPLIFIER
LIMITER
+
U127A
3303
C130
470pF
R137
121k
C129
470pF
1
2
3
R310
0
R311
0
+
U128B
3303
1
2
3
LOWPASS FILTER BUFFERS
R312
0
R313
0
+
U128C
3303
8
9
10
R139
35.7k
+
U128D
3303
C128
.0033
R140
17.4k
C127
680pF
14
13
12
LOWPASS FILTERS
R141
22.6k
+
U128A
3303
C126
.01
R142
17.4k
C125
680pF
1
2
3
R143
3.3k
C131
.0047
R320
180k
U118A
DIGITAL MOD
MUTE GATE
2
1
U157-14 (1)
DIGITAL MOD MUTE
3
U118B
NORMAL MOD MUTE
GATE
7
8
U106-15 (1)
NORMAL MOD MUTE
6
R271
180k
CR123
6.2V
U149
X9C10415
100k
VH
VW
VL
CS
7
U155-15 (1)
3
CR122
6.2V
5
+
U129C
3303
C165
360pF
8
9
10
6
CR121
6.2V
R270
39k
C140
.1
R155
82k
+
U129B
3303
R156
82k
C146
390pF
R218
82k
C160
.1
R157
82k
C141
.1
R158
82k
U118C
EXTERNAL MOD
MUTE GATE
10
9
U106-14 (1)
TX MOD MUTE
11
R321
100
U118D
TX MOD
MUTE GATE
15
16
14
5
4
3
2
1
P107
P106
J106
R323
0
R322
0
R176
6.8k
C150
.022
+
U129A
3303
1
2
3
R173
430k
C136
.0047
R171
10k
R172
10k
+5V-5V
R175
4.3k
R174
160k
C148
.01
U100A
74HC02
3
2
1
R169
54.9k
U100B
74HC02
6
5
4
R170
1M
CWID CONTROL
U107-12 (1)
CWID
GENERATOR
TX AUDIO AMPLIFIER
2
1
U/
D
IN
C
U106-13 (1)
U106-12 (1)
U111-12 (1)
TX DATA
R201
270k
R202
1M
U111-13 (1)
TX SHAPE
+
U126A
3303
1
2
3
U117B
TX DATA
ENABLE GATE
6
8
U111-14 (1)
TX DATA EN
7
R275
36k
CR125
6.2V
U151
X9C10415
100k
VH
VW
VL
CS
7
3
CR124
6.2V
5
+
U126B
3303
7
6
5
CR126
6.2V
R274
36k
TX DATA AMPLIFIER
2
1
U/
D
IN
C
U155-13 (1) U106-13 (1)
U106-12 (1)
R204
47k
+3.5V
V REF EX
R160
1.1k
R159
2.74k
R163
100k
R165
47k
C143
.022
R161
3.01k
R162
18.2k
+
U126C
3303
8
9
10
C142
.01
R164
100k
R167
56k
R166 56k
C136
.0068
+
U126D
3303
14
13
12
C142
.047
R168
2.2k
U106-16 (1)
EXT MOD MUTE
11 EXTERNAL MOD
28 A-D LEVEL
P100
8 TX DATA OUT
9 TX DATA IN
29 TX MODE
C232
.01
+
C257
47
-5V
+
C269
47
+
C270
47
C170
.01
C171
.01
C172
.01
C173
.01
C174
.01
C175
.01
C176
.01
C177
.01
C178
.01
C179
.01
C180
.01
C181
.01
C182
.01
C183
.01
C184
.01
C185
.01
C219
.01
C220
.01
C221
.01
C222
.01
C223
.01
C224
.01
C225
.01
C226
.01