intercom. When CDR ONLY position is used, only the crew commander can key the radio(s). In
CDR+CREW position, all crew members can key the radios connected to the intercom set. Without
radio, the intercom can be operated with the RADIO TRANS switch in any of its three positions.
Figure 9. AM-1780 control and switch locations.
n. See Figure 10, C-2298/VRC jacks and controls. Jacks J801 and J804 (A) provide a
connecting point for interconnecting cable CX-4723, which provides operating voltage and a signal path
to the C-2298/VRC. Jacks J801 and J804 are wired in parallel, and another control box can be
connected in tandem. Jack J802 (RAD)(B) provides for a connection of an audio accessory. Jack J802
is used to key, talk, and listen on either the intercom or radio, depending on the setting of the
MONITOR switch. Jack J803 (INT) (C), marked with a yellow band, provides a connection for an
audio accessory. When jack J803 is used, key, talk, and listen only for the intercom is available in all
positions of the MONITOR switch except C. The MONITOR switch (D) provides the selection of the
different radios and the intercom. The VOLUME-control (E) adjusts the level of the audio signal being
applied to the audio accessory jacks.