Main Junction Box (Amplifier, Audio Frequency AM1780/VRC). The main junction box controls power to the radios
and the control boxes. Refer to the following list for main junction box switch settings:
Removes all power from the system.
Allows communication between crewmembers.
Supplies power to the mounting adapter or power supply adapter (power to radios).
Removes power to the control boxes.
Supplies power to the control boxes.
Reduces receive RT audio (intercom audio remains the same).
Disconnects PTT capability between radios and control boxes.
Used when main junction box is connected to radios.
Used when main junction box is not connected to radios.
Allows all crewmembers to use PTT for radios.
Allows commander (only) to use PTT for radios.
Does not allow PTT for radios.
VIC Control Box (Control, Intercommunication Set C2298/VRC). The control box is used to allow communication
between commander and crewmembers. If you have a different control box (C2296, C2297, or C10456) in the VIC
system that you are using, refer to the appropriate operator's manuals for switch settings. Refer to the following list
for control box switch settings:
VIC CONTROL BOX FUNCTIONS BY SWITCH POSITION:
RADIO "A" (TALK + LISTEN)
RADIO "B" (LISTEN)
INTERCOM (TALK + LISTEN)
* Position B is not used with SINCGARS.