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The VHF NAV/COMM transceiver is electrically supplied by "BUS 1" bar via a master radio relay and protected by CB 86 "NAV / COM 1" 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 )00(.0000 8.33 KHz
)00(.010 )00(.0083 8.33 KHz
XXX.015 )00(.0166 8.33 KHz
XXX.025 XXX.0250 25 KHz
XXX.030 )00(.0250 8.33 KHz
)00(.035 )00(.0333 8.33 KHz
XXX.040 )00(.0416 8.33 KHz
)00(.050 )00(.0500 25 KHz
)00(.055 )00(.0500 8.33 KHz
)00(.060 )00(.0583 8.33 KHz
)00(.065 )00(.0666 8.33 KHz
)00(.075 )00(.0750 25 KHz
AHAH
Validity : KX 155A 23 12-00Page 6
(cm) NOV 01
Displayed frequency Operating frequency
(MHz) Receiver selectivity
)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, 8.33 KHz version
B. E31 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.
C. Radio master relays
Radio master relays enable all radiocommunication and radionavigation systems mounted on PL30 radio rack to be electrically supplied.
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.
4. OPERATION
The radio master switch controls the energization of all the radionavigation and radiocommunication systems.
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