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Page Title: INTERCOMMUNICATION SET, AN/VIC 1(V). Continued
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Figure 1-2.  AM 1780/VRC SINCGARS Radio Interface P ath
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TM-11-5820-890-20-2 Ground ICOM Radio Sets Manual
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INTERCOMMUNICATION SET, AN/VIC 1(V). Continued - TM-11-5820-890-20-2_51


TM  11-5820-890-20-2 1-38 1.13. INTERCOMMUNICATION SET, AN/VIC 1(V). Continued J504, J505, J506, or J507, pin F keys RT B. This PTT ground passes through the RADIO TRANS and INSTALLATION switches and exits on J503, pin S. The control box must be set to the C position. (d)   RT Transmit Audio. The amplified transmit audio for RT A or SRM enters J504, J505, J506, or J507, pin K and exits J501, pin U. The control box setting is set to ALL or A for RT A or A for the SRM. The amplified transmit audio for RT B enters J504, J505, J506, or J507, pin V and exits J503, pin U. The control box setting is C. When intercom is keyed, K502 energizes which cuts off transmit audio. c. Control Box C 2298. ALL C 2298 J804 J801 J803 J802 AUDIO ACCESSORY CONNECTORS C B INT ONLY A (1)   Circuit Description.  The C 2298/VRC is a control box connected to the main junction box. It has a MONITOR switch, a VOLUME control, and a microphone (mic) amplifier. Power and control voltages used by the control box are supplied through connectors J801 or J804. Multiple control boxes can be connected in tandem. Audio accessories are connected to connectors J802 (RAD) and J803 (INT). Pins A, B, D, and E of J802 and J803 are wired in parallel. Pin C of J802 is used to key a radio. The radio cannot be keyed from connector J803. Audio signals from the intercom or radio are applied to pins B and E of connectors J802 and J803. Audio signals from the mic are applied through pin D to the amplifier A80 and the main junction box to the other control boxes or to the transmit (XMT) circuitry in the RT. The MONITOR switch is used to select intercom or radio functions. (2)   Functions of the MONITOR Switch Positions.  Refer to Figure 1-3. The MONITOR switch  is used to select the audio and mic circuits to be connected to J802 and J803. The MONITOR switch can select one of five positions. Positions •ALL" and •A" permit control of the bottom RT (RT A). Position •C" permits control of the top RT (RT B). When using a single radio mount the only position that can be used is the •ALL" position.

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