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User's Manual

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INSTALLATION
MOBILE STATIONS
ENVOY™ TRANSCEIVER REFERENCE MANUAL 357
Connecting the power supply
Power and control cabling
The connection from the transceiver is made directly to the battery/power source via
a twin core cable.
The cable should:
• be of adequate electrical capacity
• be fused in the positive leg at or near the battery terminal
• not be used to provide power connections to any other equipment
The cable from the battery must be able to carry the full supply current, so it must be
of correct size. As the distance between the transceiver and the battery increases, the
cross-sectional area of the cable must increase proportionally to minimise the voltage
drop. For example, a 100 W transceiver positioned 2 m (2 yd) away from the battery
requires a cable with a cross-sectional area of approximately 4 mm
2
(11 AWG),
whereas a transceiver 5 m (5 yd) away from the battery requires a cable with a
cross-sectional area of approximately 10 mm
2
(7 AWG).
A heavy-duty power cable is supplied with the vehicle-mounting cradle for mobile
stations. This cable minimises the voltage drop between the battery and transceiver
during transmission.
CAUTION: If you use a thinner cable, signal quality may be affected.
Related links:
Voltage drop on page 356
Connecting the battery supply
A battery supply may be used as a direct source of power in a mobile installation, or
as a back-up source of power in a fixed installation.
To connect the battery supply:
Connect the red positive and black negative wires from the power cable of the
transceiver to the positive and negative terminals of the battery, respectively.
Fit a suitable fuse as near as practicable to the positive side of the battery
connection.
A 32 A cartridge fuse (Codan part number 15-00711) is recommended.
CAUTION: Do not connect the power supply to the ignition switch or the
body next to the transceiver due to voltage drop and noise
interference.
Route the power cable away from other vehicle wiring, including high-voltage
ignition wiring between the spark plugs, distributor and coil.