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Electrical power supply to radiocommunication and radionavigation systems is automatically interrupted during the engine starting phase. In reception mode, VHF NAV/COMM. transceiver receives the signals detected by the antenna. Once the useful signal of the carrier wave has been extracted, an audio signal provided by the transceiver is applied at the input of A50 audio control panel. The position of the headset and/or loudspeaker selection buttons assigned to COM 1 installation (on A50 audio control panel) determines the application of the audio signal, once the latter has been adapted and amplified, to the loudspeaker and / or the headsets. In transmission mode, the function selector of A50 audio control panel enables to connect the push-to-talk and microphone lines to the VHF NAV/COMM. transceiver inputs. Switching to transmission mode can therefore be obtained either by the push-to-talk switches located on the control wheels, or by the hand microphone control button. Actuating the push-to-talk switch triggers the transmission mode of the transceiver. A modulated VHF signal is transmitted in all directions by the antenna. AHAH Validity : KX 155A 23 12 00 ( C m ) NOVeo 81 COM 1 INSTALLATION DESCRIPTION AND OPERATION 1. GENERAL The optional radiocommunication COM 1 installation allows radio transmissions necessary for air navigation. The installation consists of : - the A78 COMM.NOR-ILS/GPS transceiver, - the E31 antenna, - the radio master relays, - the S120 radio master switch. With "Ground Clearance" - "Ground Clearance" assy consists of : . two K201, K202 relays, . a K200 switch. All For the description of navigation function of the A78 COMM.NOR-ILS/GPS transceiver, refer to 34-51-00. For the description of GPS function of the A78 COMM.NOR-ILS/GPS transceiver, refer to 34-57-00. The installation also uses A50 audio control panel - refer to 23-11-00. Without "Ground Clearance" The installation is electrically supplied by "BUS 1" and "BUS 3" bars. With "Ground Clearance" The installation is electrically supplied by "BUS 1" bar or by the battery and "BUS 3" bar. 2. LOCATION (Figures 1 and 2) COMPONENT QTY AREA ACCESS DOOR REFERENCE A78 COMM.NOR-ILS/GPS transceiver 1 251C / 23-10-00 E31 antenna 1 220 / 23-12-02 Radio master relays 4 230 / 23-12-06 S120 radio master switch 1 251C or 254L / 23-12-00 K201 relay (option) 1 230 211R 23-12-00 K202 relay (option) 1 230 211R 23-12-00 AIAI COMPONENT QTY AREA ACCESS DOOR REFERENCE |
