User's Manual

INSTALLATION
MOBILE STATIONS
360 ENVOY™ TRANSCEIVER REFERENCE MANUAL
Noise reduction
In some cases, noise can be reduced by connecting the case of the transceiver directly
to earth. If an improvement is noticed, the existing functional RF earth may be
inadequate and need improvement.
Where the antenna and transceiver must be installed in close proximity, directly
earthing the transceiver may be necessary to eliminate RF feedback.
Troubleshooting the mobile installation
Common problems caused by incorrect installation are listed in Table 34.
Table 34: Possible faults in the 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 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.