I A P 2 0 2 3 . 0 0 1 - A F M / I R I S T E X A N I I P A G E | 87
FOR SIMULATION USE ONLY ā NOT A TRAINING AID
The interphone amplifier for ground crew communications is powered when the
battery switch in either cockpit is activated. Volume control is provided through the
headset control.
COMMUNICATIONS
The communications system includes a COM1 (UHF) transceiver and a COM2 (VHF)
transceiver which provide voice communication for air-to-air or air-to-ground
communication.
Control of communications transmit capability is provided by the COM1/COM2 key
toggle switch on the inboard face of either PCL (Figure 1-13). To transmit on COM1,
press the toggle up; to transmit on COM2, press the toggle down.
Any time either cockpit is transmitting on VHF or UHF, the cockpit not transmitting
can receive incoming transmissions on the radio not in use (e.g., front cockpit
transmitting on UHF, rear cockpit can receive incoming transmission on VHF).
COM1 - Ultra High Frequency (UHF)
The COM1 transceiver provides two-way air-to-air or air-to-ground voice
communications over a frequency range of 225.00 to 399.975 MHz in 25 kHz
increments (7000 channels).
The audio output has automatic squelch (internally adjustable carrier to noise) with
manual disable and squelch override. When COM1 UHF mode is set to BOTH (via the
UFCP or the FMS FREQ controls), the UHF continuously monitors both the primary
frequency selected and the GUARD frequency (243.00 MHz). Communication
frequencies and tuning functions are entered using the UFCP or MFD in the
respective cockpit. If the preset database is loaded, up to 99 preset frequencies can
be selected from the IACs for retrieval by the UFCP.
The active COM1 frequency is displayed in W1 of the UFCP persistent display.
Power is provided by the generator bus through a circuit breaker, placarded COM1,
located on the generator bus circuit breaker panel in the front cockpit.
COM2 - Very High Frequency (VHF)
The COM2 transceiver provides two-way air-to-air or air-to-ground voice
communications over a frequency range of 118.00 to 151.95 MHz in 8.33 kHz
increments (1358 channels).
The audio output has automatic squelch (internally adjustable carrier to noise) with
manual disable and squelch override. Communication frequencies and tuning
functions are entered using the UFCP, MFD, or by the VHF standby control head
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