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P100
VOTER AUDIO
VOTER AUDIO
AMPLIFIER
MUTE
VOTER AUDIO 25
U120A
U115A
U108
LOW-PASS FILTER
Rx AUDIO
HIGH-PASS FILTER
< 3 kHz
AMPLIFIER
> 300 Hz
Rx WB AUDIO 27
U121A/B
U122A
U122B/C/D
+1.25V
U163B
HIGH-PASS FILTER
NOISE
NOISE
> 30 kHz
AMPLIFIER
RECTIFIER
U121A/B
U135B
U123A
U123B
Rx DATA
Rx DATA
DC
FILTER
AMPLIFIER
RESTORATION
U124A/B
U125A
U125B/C
U125D
TxS - 4
Tx AUDIO
TxS TO FSK
AMPLIFIER
GATE
SECONDARY AUDIO
U131C
U131D
U153D
FROM SWITCH
TxS + 3
DATA LEVEL
U107
TEST GATE
U153A
TxA + 15
Tx AUDIO
TxA TO FSK
AMPLIFIER
GATE
MAIN AUDIO
U167A
U167B
U116D
FROM SWITCH
TxA - 16
Tx AUDIO
U107
U116C
Tx VOICE
AMPLIFIER
U130B
U153B
Tx VOICE
Tx VOICE
AMPLIFIER
GATE
U130A
U158A
Tx VOICE 32
U107
6-51
NORMAL RX
RX MUTE
RX OPTION
DE-EMPHASIS
GATE
GATE
GATE
U163A
U113B
U113C
U114A
U157
U108
U114B
Rx ACTIVE
U113D
U157
GATE
RX OPTION
SCHMITT
TIMING BUFFER
TRIGGER
U123C
U123D
LOGIC SQ A-D
GATE
U159B
A301
U157
COMPANDING
OPTION
U111 Rx DATA
DATA TO A-D
GATE
U159C
U107
U107
Tx OPTION
LEVEL DETECT
GATE
GATE
U158C
U159A
U106
U106
U158D
GATE
Tx OPTION
U158B
Tx OPTION
GATE
U107
Tx NET
GATE
U155
Tx INTERCOM
GATE
U117A
U157
LOCAL MIC MUTE
Tx AUDIO
HIGH-PASS FILTER
GATE
BUFFER
> 300 Hz
J102
U164A
U117C
U164B
U127B/C
LOCAL MIC PTT
U106
Q101
Q102
U105 LOCAL MIC PTT
October 1999
Part No. 001-2009-201
Rx VOICE
LOCAL AUDIO
GATE
OUTPUT AMPLIFIER
U114D
U132
U108
Rx VOICE
TO BACKPLANE
Rx VOICE
VOICE
GATE
GATE
AMPLIFIER
U115B
U120B
U115C
U108
U108
Rx NET
FSK AMPLIFIER
GATE
REPEAT
U115D
U165B
GATE
U153C
U155
U108
U107
MAIN AUDIO
RX AUDIO
AMPLIFIER
GATE
U114C
U116B
U166A
U108
SECONDARY
FSK TO AUDIO
AUDIO AMPLIFIER
GATE
U116B
U131A
U108
FSK AMPLIFIER
U165A
Tx MOD A D
GATE
U159D
U106 INC
U157
U106 U/D
Tx SHAPE U111
Tx DATA ENABLE
GATE
U126A
U117B
Tx DATA U111
U111
Tx AUDIO AMPLIFIER
U106 INC
U106 U/D
SPLATTER FILTER
NORMAL MOD MUTE
LIMITER
LPF
BUFFERS
LPF
GATE
U127D
U127A
U128B/C
U128D/A
U118B
U106
J104
EXTERNAL SPEAKER
J101
SPEAKER/MIC
BUFFER
U166B
BUFFER
U131B
TxD
Tx OUT
TxD
U162C
U109
P101
23 SWITCH Tx DATA
RS-232
RxD
22 SWITCH Rx DATA
U110
Rx IN
U162B
J100
A-D LEVEL
TEST POINT
Tx DATA AMPLIFIER
U151
U155 CS14
Tx DATA FILTER
U126B
U126C
U126D
CWID TONE
CWID FILTER
GENERATOR
U100B/A
U129A
J106
P106
P107
SUMMING
Tx MOD MUTE
AMPLIFIER
U129B
U118D
U149
U155 CS12
EXTERNAL MOD MUTE
U129C
U118C
MAIN AUDIO CARD AUDIO BLOCK DIAGRAM
FIGURE 6-22
P100
31 Rx VOICE
14 Rx AUDIO -
MAIN AUDIO
TO SWITCH
13 Rx AUDIO +
2 RxS -
SECONDARY AUDIO
TO SWITCH
1 RxS +
28 A-D LEVEL
8 TxD OUT
9 TxD IN
GATE
29 Tx MOD
U106
GATE
U106
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