INSTALLATION
MOBILE STATIONS
398 ENVOY™ TRANSCEIVER REFERENCE MANUAL
Troubleshooting the mobile installation
Common problems caused by incorrect installation are listed in Table 34.
Table 34: Possible faults in the mobile installation
Symptom Possible cause Action
No power The internal fuse of the
transceiver has blown
Replace the fuse.
Poor connections Check that the battery is connected correctly to the
transceiver.
Power not switched on Check that the AC mains supply and the
transceiver supply are both switched on.
Battery not supplying the
correct voltage, or is in
poor condition
Check battery supply.
Tuning fails Inadequate earthing of the
antenna
Antenna mounting bracket should be welded or
bolted directly to the chassis.
All paint should be cleaned from mating surfaces.
The earth braid provided should be connected to
an independent earthing point going to the
bodywork of the vehicle, or to the battery negative
if possible.
Distortion of the
transmit audio signal
Inadequate earthing of the
transceiver to the vehicle
chassis
Improve the earth of the transceiver by connecting
an earth strap (braid or copper strip) from the earth
screw of the transceiver to the vehicle chassis,
keeping the strap as short as possible.
Transceiver is not
responding to
instructions
The transceiver may not be
connected correctly
Check that the cables and connectors between all
items of equipment are securely connected and not
damaged.
Faulty cables and/or
connectors
Check that the cables and connectors between all
items of equipment are securely connected and not
damaged.
Voltage drop in the
fuse, the control
leads, or the battery
Voltage less than 12 V DC Check the voltage; it must be greater than
12 V DC on transmit.
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