OPERATION WITH EXTERNAL EQUIPMENT Continued
VIC SYSTEM (Intercommunication Set AN/VIC-1 (V)). The VIC system provides
control of power to crewmember control boxes and the radios. The amplifiers also
amplify and control the audio signals. The main junction box (AM-1780/VRC) has
ten cable connectors used to connect to control boxes and an RT or RCU. It has
four selector switches, one circuit breaker, one power indicator, two sets of binding
posts and an audio amplifier. Four connectors are used to connect control boxes.
Connector J504 is always used for the commanders control box. Crewmember con-
trot boxes are connected to J505, J506, or J507. Three RT or RCU can be connected
to the main junction box. The main junction box and control boxes can be used with
a radio or RCU mounted in either a mounting adapter or power supply adapter. Refer
to the following applicable cabling diagrams. For control box C-2298/VRC and main
junction box switch settings, refer to page 4-19.
MOUNTING ADAPTER WITH ONE OR TWO RT/RCU
SINGLE RADIO MOUNT WlTH ONE RT/RCU