(b) ICS. Selects intercom system. Intercom will be activated when control wheel microphone switch is
depressed to the irst or second level, or when cockpit loor microphone switch is depressed.
Position 1. Selects VHF-AM #1 transceiver.
(d) Position 2. Selects VHF-FM (SINCGARS) transceiver or VHF-AM #2 transceiver depending upon
the position of the AM/FM alternate communication selector switch (pedestal extension, Fig. 2-19.
Position 3. Selects #1 UHF transceiver.
Position 4. Selects HF transceiver or VOW transceiver.
Position 5. Selects #2 UHF transceiver (BU VOW)
(6) Intercom mode selector switch. The three-position intercom mode selector switch, placarded HOT
MIC, NORM, ICS OFF , controls the operating mode of the intercom system.
(a) HOT MIC. Microphone will be continuously connected to intercom system except when transmitter-
intercom selector switch is set to a transceiver, and control wheel microphone switch is depressed to the second
level, or cockpit loor microphone switch is depressed.
(b) NORM. Microphone will be connected to intercom system only when the control wheel microphone
switch is depressed to the irst level. If the transmitter-selector switch is set to the ICS position, the intercom will also
be activated when the control wheel microphone switch is depressed to the second level.
ICS OFF . Deactivates intercom system.
b. Normal Operation.
(1) Turn-on procedure:
(a) BATTERY switch (overhead control panel, Fig. 2-13) -- ON.
(b) AVIONICS MASTER POWER switch (overhead control panel, Fig. 2-13) -- ON.
(2) Receiver operating procedure:
(a) Master VOL control -- Adjust as required.
(b) Receiver RADIO MON controls (audio control panel, Fig. 3-1) -- ON and adjust as required.
(3) Transceiver operating procedure:
(a) Transmitter-intercom selector switch -- Set to desired transceiver.
(b) MIC selector switch (instrument panel, Fig. 2-23) -- HEADSET or OXYGEN MASK.
(c) Control wheel microphone switch -- Depress to XMIT (second level), or depress cockpit loor
MIC switch to transmit.
(4) Intercommunication procedure:
(a) MIC selector switch (instrument panel, Fig. 2-23) -- HEADSET or OXYGEN MASK.
(b) Intercom mode selector switch (Fig. 3-1) -- NORM or HOT MIC.
(c) If HOT MIC is selected -- Speak into microphone.
(d) If NORM is selected -- Depress control wheel microphone switch to irst level (XMIT) and speak
c. Shutdown Procedure. AVIONICS MASTER POWER switch - OFF .
3-7. UHF TRANSCEIVER (AN/ARC-164, HAVE QUICK II).
The ARC-164 transceiver, located on the left equipment rack, is a line-of-sight radio transceiver which provides
transmission and reception of amplitude modulated (AM) signals in the ultra high frequency range of 225.000 to
399.975 MHz for a distance range of up to 100 miles. Channel selection is spaced at 0.025 MHz. A separate
receiver is incorporated to provide monitoring capability for the UHF guard frequency (243.0 MHz). UHF audio output
is applied to the audio panel where it is routed to the headsets. This system provides for secure communications
through interfacing with a voice security system. A frequency hopping, or anti-jam mode is also available. The UHF