Table of Contents
Advertisement
LOW -PASS FILTER < 3 kHz
C104
R106
820pF
C105
.001
C102
U101B
.0022
6
2904
U101A
R104
R105
C101
2
7
R101
R102
2904
147k
69.8k
1
5
P100
.1
+
29.4k
54.9k
3
RX WB AUDIO 27
+
C106
R103
C103
100pF
1M
.001
+9V
R118
6
6.2k
5
+
R119
C124
1k
.1
HIGH-PASS FILTER > 30 kHz
C126
100pF
R121
150k
C125
C127
NOISE AMPLIFIER
SQ ADJ
100pF
100pF
U105A
C128
R122
R124
R123
2
33178
.001
5.1k
47k
100k
1
R120
3
C157
+
18k
20pF
U105B
C129
R125
6
33178
1.5k
.01
4
5
+
R147
100k
RECEIVE DATA FILTER
C135
.01
DATA AMPLIFIER
R146
R148
U108B
R153
R154
6
U108A
C136
2904
100k
47k
R151
51k
100k
2
.047
7
2904
56k
1
5
+
C134
3
+
R152
.022
2
56k
C137
.0068
3
R150
R149
+
7.5k
10k
-5V
+9V
+5V
NOTES:
+5V
1. ALL RESISTORS ARE IN OHMS AND CAPACITORS IN MICROFARADS
UNLESS OTHERWISE SPECIFIED.
R205
R208
Q201
WHEN VEGA OPTION IS USED (023-2000-960), S100 SWITCHES MUST BE
6.8k
10k
2
IN THE "OFF" (OPEN) POSITION.
3657
U14-2 (1)
R207
LOCAL MIC PTT
10k
R204
Q202
2.2k
3658
R206
10k
R210
180k
J102
C201
R209
U203A
LOCAL MIC JACK
.1
16k
2904
2
1
3
+
10
U16-14 (1)
9
U134C
LOCAL MIC MUTE
11
C203
.1
R212
C202
R213
43k
.1
43k
HIGH-PASS FILTER > 300 Hz
TX AUDIO BUFFER
R214
R217
22k
R215
25.5k
U204C
C208
R219
U204B
43.2k
9
3403
C206
C207
.0047
3.3k
U203B
3404
C204
C205
6
.0033
.0039
8
6
2904
7
10
.0056
.0047
+
7
5
+
5
+
R218
R216
909k
86.6k
10-23
C112
HIGH-PASS FILTER > 300 Hz
C117
.022
.022
NARROW BAND
AUDIO ADJ
R107
R108
C113
C118
43k
100k
390k
.0022
.0068
C107
C109
C110
C114
C115
68pF
.22
.033
.0047
.047
U103A
C108
R109
R110
R112
2
2904
15k
.033
100
110
1
3
+
C111
U103B
C116
.068
6
3403
.1
9
7
5
10
+
+
+1.25
R111
R113
1.07M
1.07M
U104B
33178
7
C131
R128
NOISE RECTIFIER
.1
10k
R126
R129
6.2k
47k
RT100
-5V
R127
10k
CR101
CR102
SCHMITT TRIGGER
U107A
U107B
C130
12k
2
3403
6
3403
.01
1
7
9
3
5
+
+
10
R131
C132
.1
R130
47k
10k
R132
330k
DC RESTORATION
R156
47k
U110B
5
3403
+
CR104
7
COMPARATOR
6
U110D
R155
+ C138
R159
R157
12
15
3403
270k
+
10k
100k
C140
14
13
-5V
.001
U110A
R158
3403
U110C
CR106
R160
1
10
100k
+
3403
5.1k
CR107
CR105
8
+5V
9
+ C139
R161
R162
15
1k
18k
-5V
U17-19 (1)
C158
U137C
9
.1
DATA TO A-D
10
11
C231
CWID FILTER
.0047
CWID GENERATOR
R258
430k
U209B
U209A
74HC02
C232
CWID
R256
5
74HC02
U208A
CONTROL
4
2
.0047
C233
150k
3403
6
1
2
U15-12 (1)
.022
3
1
C230
R257
3
+
R254
R255
.01
4.3k
1M
54.9k
R260
R259
10k
10k
-5V
+5V
CR201
LIMITER
R223
LOWPASS FILTERS
150k
+5V
CR202
R220
2.4V
1k
C211
CR203
R221
.0033
2.4V
150k
U204A
C209
R226
R227
U204D
CR204
CR205
470pF
2
3403
R224
35.7k
27.4k
3403
13
1
121k
14
3
+
12
+
R225
121k
R222
150k
-5V
August 2000
Part No. 001-2001-200
OPTION
C121
.022
WO 101
WO102
DE-EMPHASIS
C122
R116
C123
.022
18.2k
.01
10
C119
9
U132C
.068
11
R114
R117
110
47k
U15-17 (1)
U131C
RX
U131B
NORMAL
RECEIVE
OPTION
C120
U103C
U103D
U104A
RX GATE
MUTE GATE
1
.1
13
2
3403
3403
33178
8
14
1
6
7
11
10
3
12
3
+
+
8
9
U132A
RECEIVE
OPTION GATE
R115
1.07M
CONNECT IF NOT USING EXTERNAL
SQUELCH GATE CONTROL
J105 P105
+5V
R144
2
10k
U15-18 (1)
1
NORMAL RX
R175
R174
15
U131D
10k
10k
U15-19 (1)
RX SQ
16
RX SQ ACT
ACTIVE
CR215
R176
CR109
14
GATE
100k
5.1V
CR217
TIMING BUFFER
R140
+5V
470k
U107C
R138
R139
R142
3403
U107D
CR103
100k
100k
R141
3.9k
8
12
3403
4.3V
10k
14
+
R133
+ C133
13
+
1M
1
R143
1k
R134
-5V
R190
3.9k
1k
R137
CR110
R135
CR108
10k
5.1V
2.4k
U133A
+5V
REPEAT GATE
R136
2
3
1k
1
U15-13 (1)
OPTION
WO 100
WO 103
+5V
R211
10k
R201
R203
R202
U136D
36k
36k
100k
14
15
C227
100pF
16
U16-16 (1)
U136A
TX OPTION
U202A
TX VOICE GATE
9
2
33178
1
2
3
10
11
CR212
3
+
U136C
15V
1
6
TX OPTION GATE
8
U137B
U16-15 (1)
CR213
U16-19 (1)
LOGIC SQ
15V
7
A-D
TX AUDIO AMPLIFIER
U207
7
1
U18-15 (1)
CS
INC
U15-13 (1)
X9C10415
100k
2
U/D
U15-12 (1)
R244
82k
VL
VH
VW
3
5
6
R230
R232
180k
39k
C235
C218
.01
360pF
7
U135B
U208C
U17-19 (1)
8
C219
R241
3403
NORMAL MOD MUTE
9
.047
82k
6
8
10
+
R243
R261
TX DATA
18k
240k
AMPLIFIER
C224
R242
100pF
36k
.22
R238
R236
R237
1k
47k
100k
C229
U206A
100pF
6
7
5
+
U206B
C217
2904
C213
100pF
.01
U205A
U205B
2
2904
R228
R229
2904
6
1
22.6k
17.4k
7
3
+
5
+
C214
C212
680pF
680pF
MAIN AUDIO CARD SCHEMATIC (3 OF 3)
+5V
+15V
R145
10k
+ C141
6
220
8
U132B
U132D
LOCAL AUDIO
+ C144
7
R163
MUTE GATE
15
5
47k
2
14
15
C142
R191
10
1k
R164
16
1
4
10k
U111
R165
U15-16 (1)
TDA2003
39
LOCAL AUDIO
ON/OFF/VOL
C146
.1
2
C143
C147
.01
220
P100
15 TPI SQ ENABLE
15V
C300
R268
R270
R272
R273
R269
S100
2
15V
10
10k
2.2k
100k
300
100k
1
8
1 RX+
C298
300pF
C299
300pF
U210A
R271
2
33178
U210B
C301
100k
R274
1
6
33178
10
300
2
7
3
7
+
2 RX-
5
+
16 TPI LOGIC NOISE SQ
22 TPI RX DATA
U133B
R171
R173
R172
RX VOICE GATE
36k
36k
100k
6
7
C150
8
360pF
U133C
RX VOICE TO
U15-15 (1)
U113B
C153
R188
BACKPLANE
6
33178
10
1k
7
10
11
INSTALL IF
13 TPI RX VOICE
5
USING EDACS
+
C154
9
SYSTEM
.1
U15-14 (1)
R264
R265
C296
S100
2
.1
75k
75k
3
6
3 TX+
R262
6
300
6
8
7
U136B
5
+
7
U202B
R263
C297
R266
33178
300
75k
.1
4
5
4 TX-
P106
R267
75k
J202
J106
3
1
CONNECT IF
2
STD TPI
USING WITH
2
2
JOHNSON
1
U16-17 (1)
E-OPTION
LTR LOGIC
1
17 TPI TX AUDIO
U137A LEVEL DETECT
3
P202
C225
.1
28 A-D LEVEL
CR208
CR214
J100
A-D LEVEL
3.9V
3.9V
TP
J103
CR209
CR216
3.9V
3.9V
23 MA
R240
82k
C234
C221
.01
100pF
U17-17 (1)
R239
9
C222
U129B
82k
13
11
10
1
3303
+
20 TPI HS DATA
14
C220
15
12
U135C
U137D
1
16
EXT MOD MUTE
U15-18 (1)
TX MOD
GATE
A-D GATE
14
R245
82k
C223
390pF
U208B
6
3403
7
29 TX MOD
5
+
P201
R235
10k
J201
2
C228
U135A
1
TX DATA
C216
C215
R234
R250
ENABLE
220
220
1.2k
4.7k
2
2
3
18 TPI SUB TX DATA
1
CR210
3
+
1
3.9V
2904
U17-14 (1)
CR211
3.9V
+5V
R247
U17-13 (1)
5.1k
R251
R252
16
10k
10k
TX TONE
R249
R248
14
15
U7-11 (1)
330k
470k
R253
U135D
R233
24k
TX TONE ENABLE
1k
7 V REF EX
C226
.1
FIGURE 10-28
C145
.1
+ C149
R166
470
1
C148
.1
LOCAL AUDIO OUTPUT
J104
EXT SPKR
R167
220
J101
SPKR/MIC
R168
2.2
R169
51
(TO ADAPTER CARD)
(FROM ADAPTER CARD)
(LOW SPEED DATA ENABLE)
(HIGH SPEED DATA)
(LOW SPEED DATA)
FOLDOUT
Advertisement
Table of Contents
