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- a "OFF / PULL TEST" knob to turn on the equipment and to adjust the audio level. It also controls, when pushed in, the automatic squelch.
- a "CHAN" button which enables, when pushed in but not held, to enter the channel mode used to recall preset frequencies stored in memory (concentric knobs enable to select the channel). When it is pushed in more than two seconds, it also enables to enter the frequency programming mode (channel mode). When the channel mode is selected, the two concentric knobs are used to select the channel number and, when the "-›" pushbutton is pushed in but not held, to select the associated frequency.
The VHF NAV/COMM transceiver is electrically supplied by "BUS 3" bar via a master radio relay and protected by CB 88 "NAV / COM 2" circuit breaker.
The VHF NAV/COMM transceiver is mounted on the radio rack.
Displayed frequency Operating frequency
(MHz) Receiver selectivity
)00(.000 )00(.0000 25 KHz
)00(.005 XXX.0000 8.33 KHz
)00(.010 )00(.0083 8.33 KHz
)00(.015 )00(.0166 8.33 KHz
XXX. 025 XXX. 0250 25 KHz
)00(.030 )00(.0250 8.33 KHz
)00(.035 )00(.0333 8.33 KHz
)00(.040 )000416 8.33 KHz
)00(.050 )00(.0500 25 KHz
)00(.055 XXX.0500 8.33 KHz
)00(.060 )000583 8.33 KHz
)00(.065 )00(.0666 8.33 KHz
Displayed frequency Operating frequency
(MHz) Receiver selectivity
XXX.075 )00(.0750 25 KHz
)00(.080 )00(.0750 8.33 KHz
)00(.085 )00(.0833 8.33 KHz
)00(.090 )00(.0916 8.33 KHz
Displayed frequency / Operating frequency correspondence
Table 1 — KX 155A KX 165A, 8.33 KHz version
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 MHz to 136.975 MHz frequency band.
Pre-MOD. 151
The 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 faired antenna ensures the propagation and the reception of data-conveying electromagnetic waves. All
The antenna is mounted on top of the fuselage between the cabin access doors.
4. OPERATION
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, 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 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.
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