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TM 11-5820-890-20-2
1-33
1.13.
INTERCOMMUNICATION SET, AN/VIC 1(V).
a.
General. The AM 1780/VRC audio frequency amplifier is used in track vehicles. They provide control of
the dc power to crew member control boxes and the radios. The amplifiers also amplify and control the
audio signals.
AUDIO
AM-1780/VRC
RADIOS
C
CREW C 2298/VRC
C-2298/VRC
CDR
AUDIO
CREW C 2298/VRC
DRIVER C 2297/VRC
There are two control boxes used with the VIC: C 2297/VRC and C 2298/VRC. The C 2297/VRC is the
driver's control box. The C 2298/VRC is used by crewmembers and the commander.
Cable schematics for the VIC are located in chapter 2.
b.
Main Junction Box (AM 1780/VRC)
J504
INSTALLATION
SWITCH
OFF
LINE
INPUT
AUDIO
POWER
OFF
ON
OFF
INT
ONLY
NORM
J505
J506
J507
INT ONLY
LISTENING
SILENCE
ON
INT
ACCENT
MAIN PWR
J511
J509
J510
J508
J501
J503
CDR
CREW
CDR
ONLY
RADIO
TRANS
OTHER
RETRANS
(1) Circuit Description
The main junction box has ten cable connectors used to connect to control boxes and RTs. It has
four selector switches, one circuit breaker, one power indicator, two sets of binding posts, and an
audio amplifier.
RT-A, the bottom RT in a VAA, is typically connected to main junction box connector J501 and is
controlled by setting the control box MONITOR switch to •A". RT-B, the top RT in a VAA, is typically
connected to main junction box connector J503 and is controlled by setting the control box
MONITOR switch to •C". The single radio mount uses a power supply adapter which allows only one
RT to be installed. The RT is connected to main junction box connector J501 and is controlled by
setting the control box MONITOR switch to •ALL".
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