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TM 11-5820-890-20-2
1-23
1.8.
DESCRIPTION OF COMPONENTS. Continued
INTERCOMMUNICATION SET AN/VIC 1(V) (INTERCOM) COMPONENTS
CONTROL,
INTERCOMMUNICATION
SET C 2297/VRC
CONTROL,
INTERCOMMUNICATION
SET C 2298/VRC
AMPLIFIER,
AUDIO FREQUENCY
AM 1780/VRC
BINDING POST
(LANDLINES)
BINDING POST
(AUDIO)
INDICATOR
LIGHT
The AM 1780/VRC (main junction box) controls dc voltage and audio to radios and control boxes. All controls
are located on the front panel. Dc voltage is controlled by the MAIN PWR switch. It has three positions. In the
OFF position, all voltage is removed from the system. When placed in the INT ONLY position, the crew can talk
to each other. The NORM position supplies dc voltage to the VAA or power supply adapter and turns the radios
on. The power CKT BKR controls the voltage to the control boxes. A power indicator light shows when the CKT
BKR is set to on. The INT ACCENT switch is used to reduce the RT audio and prevent confusion as to the
source of the voice in the handset or helmet. In the ON position, the INT ACCENT switch reduces the receive
audio. Intercom audio remains the same. The AM 1780/VRC may also be used to control dc voltage and audio
to RCUs.
Control Box C 2298/VRC is used by the commander and the crew to talk to each other. The crew use radios to
talk to other tank crews or commanders. There are four connectors on this box. Two are for audio accessories.
Connector J803 is used for intercom. J802 is used to operate the radio. J801 and J804 provide all power and
control signals. They are wired in parallel, so that, one jack can be connected to the AM 1780 and the other
jack connected to another control box (tandem). When connected in tandem the control boxes operate
independently.
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