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AFAF
Validity : GNS 430 23 12 00 (CI) Page 1 NOV 01
 
A - A78 COMM.NOR-ILS/GPS transceiver
 
Variante de localisation Alternate location
 
COM 1 installation — Identification and location of components
Figure 1
AFAF
Validity : GNS 430 23-12 00 (C,) Page 2 NOV 01
 

  A - E31 antenna
B - U15 printed circuit (radio master relays)
C - Radio master switch
Variante de localisation Alternate location
 
COM 1 installation — Identification and location of components
Figure 2
AFAF
Validity : GNS 430 23-12-00 (CI, Page 3 NOV 01
 
3. DESCRIPTION
A. A78 COMM./VOR-ILS/GPS transceiver (Figure 3)
The COMM./VOR-ILS/GPS transceiver enables air-to-ground or air-to-air communications within the 118.00 MHz to 136.975 MHz frequency range.
The COMM./VOR-ILS/GPS transceiver is a rectangular box installed in an attachment rack. Connections are made through three electrical connectors and four antenna connectors located on the box rear face.
For communication function, the equipment panel front face includes :
- A digital display (1) subdivided in three main windows. The COMM. function window (3) is located in the top left part of the display. This window displays the frequency being used (active frequency) and the window below displays the standby frequency,
- ".C" button (5) enables equipment energization, audio level control and squelch control, "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 when the cursor function is enabled. If necessary, push momentarily the inner concentric knob in to activate cursor function.
COMM.NOR-ILS/GPS transceiver is electrically supplied by "BUS 1" bar via a radio master relay. It is protected by CB 86 "COM 1" circuit breaker.
COMM./VOR-ILS/GPS transceiver is mounted on PL30 radio rack.
B. E31 Antenna
The E31 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 E31 antenna ensures the propagation and the reception of data-conveying electromagnetic waves. The E31 antenna is mounted on top of the fuselage at the rear of C6 frame.
C. Radio master relays
Radio master relays enable all radiocommunication and radionavigation systems mounted on PL30 radio rack to be electrically supplied.
　
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