4. Installation wiring
A. General
The installation wiring diagrams are shown in Fig. 2-4 - 2-6.
NOTES :
(1) Use only cable which is fit for use in aircraft (self extinguishing).
AWG 20 for power supply and AWG 22 for other cables.
(2) Fit rubber sleeves over the solder joints on the equipment connector.
(3) Protect the power supply with a 5 A fuse or circuit breaker.
NOTE : The VHF transceiver is protected internally by a 5 A automatic
cut-out.
(4) Type-specific cable harnesses are also available for the aircraft wiring
(details from manufacturing works).
(5) No HF cables should be included in the cable harnesses of the system
and the routing of connecting cables alongside cables which carry audio
power or pulses should also be avoided.
(6) Carefully check the wiring before switching on the unit and check
particularly that (+) and (-) have not been reversed.
B. Microphone connection
The VHF transceiver enables a maximum of two dynamic microphones and
two standard microphones (d.c. supply) to be connected at the same time. A
symmetrical input transformer with an impedance of 150 Ohm is fitted at the
input of the dynamic microphone.
Note:The dynamic mike input sensitivity can be changed in the service
mode (SF16).
Note: When the STD mike input is used, we strongly recommend to set the
sensitivity of the dynamic mike input to zero using SF16 of the service
mode. This measure will prevent disturbances from the dynamic input.
INSTALLATION AND OPERATION
AR 4201 - ( )
Page 2-2
23-10-01 December 15/95
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