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TM 11-5820-890-20-2
1-34
1.13.
INTERCOMMUNICATION SET, AN/VIC 1(V). Continued
NOTE
When using a VAA, exchanging the cables also exchanges the keying and audio lines. This
reverses the operation of the radios. Controls for RT-A operate RT-B and vice versa. Radios may
be installed this way in some types of vehicles. Install your radio according to the Technical
Bulletin for your particular vehicle.
When using a power supply adapter, exchanging the cables at the MB will make no difference.
However, there must be a connection to the main junction box J501 for power.
J504 should always be connected to the commanders control box. J505, J506, and J507 are
wired in parallel. They are used by the crew members. J508, J509, J510, and J511 are not used
with the SINCGARS radios.
Two pairs of binding posts are provided. One set, labeled AUDIO, allows for connection of an
additional receiver. The other is labeled either LINE or TEL/REMOTE and allows for connection of
a field telephone or switchboard.
(2) Functions of the Installation Switch. The switch has three positions: INT ONLY, OTHER, and
RETRANS.
(a) INT ONLY. This position allows for dc power application through J508 when radios are not used
with the intercom set.
(b) RETRANS. This position allows for dc power application through J508. Used as a radio relay
operation with the C 2297/VRC.
(c) OTHER. This position is used for SINCGARS radios.
(3) Functions of the MAIN PWR Switch. This switch has three positions: NORM, INT ONLY, and OFF.
(a) NORM. Allows for dc power to the intercom circuits and radio.
(b) INT ONLY. This position allows the commander to turn the radio off and still use the intercom.
(c) OFF. Removes dc power from the intercom circuits and radio.
(4) INT ACCENT. When set to ON, the audio signals from the radios are reduced, making the intercom
sound louder.
(5) RADIO TRANS.
(a) LISTENING SILENCE. No one can key (transmit on) radios through the intercom set.
(b) CDR ONLY. Only the commander can key the radios.
(c) CDR+CREW. All crew members can key the radios connected to the intercom set.
(6) AM 1780 Power, Intercom Keying, and Voice Path. Refer to Figure 1-1.
(a) INT ONLY Power. Power is applied from pin B of MB J3 to the AM 1780 connector J501. When
CKT BKR CB501 is set to •ON", the power lamp DS501 lights and power is distributed to pin C of
J504, J505, J506, and J507.
(b) NORM Power. The radio is powered as in section 1.10 g. Remote Control. When CKT BKR CB501
is set to •ON" the power present at J501, pin C is then distributed to DS501 and pin C of J504,
J505, J506, and J507.
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