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Speaker/Headphone
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Speaker . Adjusts the audio level of the flight compartment speakers.
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ST switch . Sidetone switch adjusts the speaker audio level in transmit. Turns the speakers ON/OFF unless oxygen mask is in use.
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MKR/MUTE . Marker beacon controls on-side receiver sensitivity. Mute silences the marker beacon audio. Rotating MUTE selects HI or LO SENSitivity.
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H’MIC . Button selected out, interphone functions operate in hot mic mode. Button selected in, connects microphone to the interphone PTT function.
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Headphone . Adjusts the audio level of headphone (master volume control).
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
The capability for controlling the operating modes, frequencies and codes can be accomplished by using the Radio Management Unit (RMU) which is the central control unit for the entire radio system.
The RMU controls all of the VHF COM tuning functions and allows emergency tuning by the FMS. When an FMS tunes the radios, the digital signals from the FMS enter the system where they act in much the same manner as if the RMU tuning knob was being operated. This will allow the FMS to enter into the system in an organized manner. For FMS operation, refer to Pilot’s Operating Manual Pub No A28-1146-185-00.
The audio section of the VHF COM provides SELCAL outputs used for airplane addressing by transmitting tones across a VHF COM channel.
VHF 1 and 2 Communications Systems
Two separate, but identical, narrow band width VHF communications systems (VHF 1, VHF 2) which can be operated separately or simultaneously, are provided. These systems are used to provide AM voice communication between the airplane and a ground station and/or another airplane. Frequency tuning and mode selection is by CRT pages and controls on the RMU.
The integrated communications units with transceivers (located in the forward fuselage avionics bay) provide VHF communication (VHF COM) and Mode S Transponder data link capabilities. The communication transceiver tuning range is as follows:
VHF 3 Communications System
The VHF 3 is located in the forward fuselage avionics bay and is used primarily as a data radio. It does not have an ATC transponder but has the capability of operating in the data mode as well as the voice mode.
The RMU automatically senses when the third VHF COM radio is installed and adds a menu selection to the MENU page. Control of frequency and operating mode is performed by the RMU and FMS CDU. VHF COM 3 works in conjunction with the Data Link System as the data radio. The communication transceiver tuning range is as follows:
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
The radio communications unit provides VHF communication (VHF COM) and Mode S Transponder data link capabilities. It interfaces with the FMS, SELCAL, TCAS, HF, audio control panels and is controllable from either RMU.
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