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- a "CHAN" button to enter the channel mode used to recall preset frequencies stored in memory.
- a transfer button "<-->" which enables the frequency displayed in the "USE" window to flip-flop with the frequency displayed in the "STBY" window.
ACAC
Validity : KY 196A 23 13-00Page 1
(CA) NOV 01
A - A52 VHF transceiver
Variante de localisation Alternate location
®
COM 2 installation - Identification and location of components
Figure 1
ACAC
Validity : KY 196A 23-13 00Page 2
(CA) NOV 01
A - E32 whip type antenna
B - E32 faired antenna (variant)
COM 2 installation - Identification and location of components
Figure 2
ACAC
Validity : KY 196A 23 13-00Page 3
(CA) NOV 01
1 - "USE" window
2 - "STBY" window
3 - Frequency selector knobs
4 - "OFF - PULL TEST" knob
5 - "CHAN" button
6 - Frequency transfer button
COM 2 installation - A52 VHF transceiver
Figure 3
The VHF transceiver is electrically supplied by "BUS 3" bar via a master radio relay. Supply line is protected by CB 88 "COM1" circuit breaker
The VHF transceiver is mounted on PL30 radio rack.
B. E32 antenna
The E32 antenna is a vertical polarisation aerial, with a 50-ohm impedance intended for omni-directional transmission and reception of signals within 118 to 136.975 MHz frequency band.
Pre-MOD. 151
The E32 whip type antenna ensures the propagation and the reception of data-conveying electromagnetic waves. It can be replaced by an optional faired antenna.
Post-MOD. 151
The E32 faired antenna ensures the propagation and the reception of data-conveying electromagnetic waves.
All
The E32 antenna is mounted on top of the fuselage between the cabin access door.
4. OPERATION (Figure 4)
The radio master switch controls the energization of all the radiocommunication and radionavigation systems.
Electrical power supply to radiocommunication and radionavigation systems is automatically interrupted during the engine starting phase.
In reception mode, VHF 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 VHF transceiver is applied at the input of A50 audio control panel. The position of the headsets and/or loudspeaker selection buttons assigned to COM 2 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 set to COM 2 enables to connect the push-to-talk and microphone lines to the VHF 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 VHF transceiver. A modulated HF signal is transmitted in all directions by antenna.
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本文链接地址：TB20 MAINTENANCE MANUAL 23 COMMUNICATIONS TB20飞机维护手册 通讯(43)
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