Becker Designed AR 3201 - Manual (Page 16)

The temperature measuring circuit in the VHF transceiver and the temperature sensor are calibrated
in the factory together for optimum temperature measuring accuracy. Should the device or the
temperature sensor develop a fault or should the transceiver need replacing, the device will need
recalibrating according to the instructions as given in Section 5, Item 5.7.
2.4 Installation wiring
2.4.1 General
Fig. 2-5 illustrates the installation wiring of the VHF transceiver. In wiring the VHF transceiver the
battery voltage feeder cable should be AWG 20.
NOTE
a) Only use airworthy cable, i.e. self-extinquishing in suitable AWG for power supply and the other
lines.
b) Pull rubber sleeves over the solder juctions on the instrument connector.
c) A 3 A fuse or circuit breaker must be incorporated in the power supply.
d) Prior to switching on the unit, carefully check the wiring, particularly making sure that +ve and -ve
are not confused.
CAUTION
The AR 3201 - ( ) is only protected against wrong polarity when a fuse is incorporated
in the power supply, i.e. so that the fuse blows, leaving the unit undamaged. If no fuse is
provided, the unit can be ruined. In this case, the unit is not covered by our guarantee.
Suitable type cable sets are available for aircraft wiring (contact manufacturer).
CAUTION
Never tie any aircraft wiring into the connecting lines. In addition, the connecting cable
must not be put down together with line carrying pulsed information (IFC’s, DME, XPR,
SLAVED GYRO) the same applying to autopilot supply and control lines.
2.4.2 Microphone connection
The VHF-transceiver features a microphone amplifier as standard which is compatible with both a
dynamic microphone and a standard microphone. Unless stated otherwise, the transceiver is set in
the factory for a dynamic microphone connection. By resoldering jumper Br 4001 on the audio module
the microphone input can be changed from a dynamic microphone to a standard microphone. This
jumper is accessible after unscrewing the case and removing the audio module. As of serial No. 86,
conversion from dynamic to standard microphone has been simplified, jumper 4401 then no longer
requiring resoldering but merely reconnecting, without requiring removal of the audio module.
AR 3201 - ( )
Page 2-2 DV 28110.03/.04 Issue 04/92