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A radio master switch controls relay operation.
When the radio master switch is set to "ON", the radiocommunication and radionavigation systems are electrically supplied via the de-energization contacts of relays.
When the radio master switch is set to "OFF", or during the engine starting phase, a voltage is applied to the relay coils. The switching of the relay contacts interrupts the electrical power supplied to the systems.
Radio master relays are mounted on a U15 printed circuit, located on the L.H. side forward of PL1 circuit breaker panel.
The radio master switch is located on PL30 radio rack or in variant on the L.H. panel strip of the instrument panel.
Radio master relays are electrically supplied by "BUS 3" bar and protected by CB 60 "RM SWITCH" circuit breaker.
AFAF
Validity : GNS 430 23-12-00Page 4
(co NOV 01
1 - Digital display
2 - Concentric knobs
3 - COMM display window
4 - "C<->" pushbutton
5 - ".C" button
1
COM 1 installation — A78 COMM.NOR-ILS/GPS transceiver
Figure 3
AFAF
Validity : GNS 430 23-12 00Page 5
(ci) NOV 01
4. OPERATION (Figure 4)
The radio master switch controls the energization of all the radio NAV and radio COM systems.
Electrical power supply to radiocommunication and radionavigation systems is automatically interrupted during the engine starting phase.
In reception mode, COMM./VOR-ILS/GPS A78 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 (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.
Press and hold transceiver "C<->" pushbutton to select directly the 121.500 MHz emergency frequency as active frequency.
In transmission mode, the function selector of A50 audio control panel enables to connect the push-to-talk and microphone lines to the A78 COMM./VOR-ILS/GPS 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.
AFAF
Validity : GNS 430 23 12 00 (CI) Page 6 NOV 01
BOITE DE COMMANDE AUDIO
AUDIO CONTROL BOX
( 23 - 11 - 00 )
EMETTEUR - RECEPTEUR COMM. / VOR - ILS / GPS
COMM. / VOR - ILS / GPS TRANSCEIVER
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