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TM 11-5820-890-20-2
1-29
1.11.
RADIO ANALOG RECEIVE PATH.
a.
SINCGARS Radios Using the AM 7239 Series.
MOUNTING BASE
VAA
J5
J4
J3
POWER
AMPLIFIER
P1
P1
P1
J1
J7
•A"
E
J6
P1
B
B
B
B
W2
B
B
HANDSET
HANDSET
W4
W4
1 W AUDIO
AMPLIFIER
D
D
J8
N
P
F
H
H
K
H
K
B
B FIXED AUDIO
A
A FIXED AUDIO
VAR
AUDIO
VAR AUDIO
AUD/DATA
AUD/DATA
CABLE
CABLE
A= RT A or RCU A
B= RT B or RCU B
CABLE
J2
J4
J3
J5
•B"
Voice signals are limited to the baseband bandwidth of 300 Hz to 3 kHz. The analog voice signal is
amplified and sent to the AUD/DATA, AUD/FILL, and rear system connector P1. From RT-A or RT-B
AUD/DATA connector, audio is taken by the W4 cable to the VAA. In the VAA, audio is amplified and sent
to speaker (SPKR) connector J6 and VAA system connector P1 as variable audio. From RT-A or RT-B
rear system connector P1, audio is sent directly to the VAA system connector P1 as fixed audio.
The audio of RT-A and RT-B are summed in the amplifier for the speaker connector J6. A mute circuit
is provided to mute the speaker during transmission. A muting line is provided at MB connector J2 for
external muting of RT-A or RT-B audio.
•A" and •B" variable audio lines are used by the VIC
•A" and •B" fixed audio lines are used both by the VIC and the LS 671.
•C", •D", and •E" models of AM-7239 do not have a connection for speaker LS-454. Only fixed audio
is sent from the RT to the VAA. Variable audio is not sent to the VIC via the W4 cable. Audio from either
radio will be the same and cannot be adjusted to differing levels to differentiate which radio is receiving.
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