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- "C<->" pushbutton (4) is used to transfer the standby frequency in active frequency and vice versa,
- two concentric knobs (2) are used to modify standby frequency over the cursor when the cursor function
is enabled. If necessary, push momentarily the inner concentric knob in to enable cursor function.
COMM./VOR-ILS/GPS transceiver is electrically supplied by "BUS 3" bar via a radio master relay. It is protected by CB 88 "COM 2" circuit breaker.
COMM./VOR-ILS/GPS transceiver is mounted on PL30 radio rack.
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Validity : GNS 430 23 13 00 (BM) Page 1 NOV 01
A - A77 COMM./VOR-ILS/GPS transceiver
B - E32 antenna
COM 2 installation — Identification and location of components
Figure 1
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Validity : GNS 430 23 13 00 (BM) Page 2 NOV 01
1 - Digital display
2 - Concentric knobs
3 - COMM. window
4 - C<-> pushbutton
5 - ".C" button
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Validity : GNS 430 COM 2 installation - A77 COMM./VOR-ILS/GPS transceiver
Figure 2
23 13 00 (BM) Page 3 NOV 01
B. E32 Antenna
The antenna is a vertical polarization aerial, with a 50-ohm impedance intended for omni-directional transmission and reception of signals within 118 to 136.975 MHz frequency band.
The antenna ensures the propagation and the reception of data-conveying electromagnetic waves. The antenna is mounted on top of the fuselage between the cabin access doors.
4. OPERATION (Figure 3)
The radio master switch controls the energization of all the radionavigation and radiocommunication systems.
Electrical power supply to radiocommunication and radionavigation systems is automatically interrupted during the engine starting phase.
In reception mode, COMM.NOR-ILS/GPS 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 2 (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 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.
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