INSTALLATION
MOBILE STATIONS
ENVOY™ TRANSCEIVER REFERENCE MANUAL 393
The cabling must be in a position that:
• is away from operator’s feet
• is secured and concealed as much as possible
• ensures all control cables are separated from the DC power cable (08-03255) by
at least 200 mm (8 in), except over short distances where they may pass through
the same hole in a bulkhead
• ensures the handset and speaker control cable (08-06022-001) is separated from
the antenna control cable (08-05627-00x) and antenna coaxial cable
(08-01503-00x) by at least 200 mm (8 in), except over short distances where
they may pass through the same hole in a bulkhead
• ensures excess cable bundles are secured separately
• is secured behind protective metalwork (only if the cables run under the vehicle)
Keep cables in the engine compartment away from:
• heat, for example, exhaust, air-conditioning systems, and water pipes
• oils and corrosive liquids, for example, engine oil, battery fluid, and brake fluid
Power supply
WARNING: All installations should be checked by a qualified technician before
power is applied to the transceiver.
Power must be provided by a 12 V DC battery for mobile stations.
Battery power supply
Batteries need to be well-charged and in good condition to ensure effective operation.
Poor condition of the battery usually leads to poor performance of your transceiver.
This includes reduced power output and signal distortion during transmission.
If a mobile transceiver causes a heavy drain on the vehicle battery, a two-battery
system can be used. Generally the vehicle alternator and charge system copes with the
extra battery, however, an isolation circuit should be provided between the batteries.
Power supply factors
Voltage drop
The most common causes of voltage drop along a cable are:
• the diameter of the wire is too thin
• the length of the cable is too long
The average current consumption of a transceiver is low except during transmission
of voice and data peaks, where high current is needed for short intervals. The power
supply cable needs to be sufficiently heavy to supply these current peaks without
excessive voltage drop.
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