INSTALLATION
MOBILE STATIONS
394 ENVOY™ TRANSCEIVER REFERENCE MANUAL
Incorrect wiring techniques, including poor choice of connection points and incorrect
use of terminal lugs, can also cause a voltage drop.
Related links:
Power and control cabling on page 394
Fuse protection
An external fuse must be fitted in the positive wire as close as possible to the battery
to ensure there is no risk of fire if the cable is damaged. The fuse must be of a type
that has a low voltage drop at peak currents.
NOTE: A 32 A cartridge fuse (Codan part number 15-00711) is recommended.
Related links:
Protecting the cables on page 396
Noise interference
The transceiver has noise-rejection circuitry and, provided correct connection and
routing of the power cable are established, noise interference via the power cable
should be kept to a minimum.
For situations where noise and interference from the vehicle is excessive, Codan
recommends that you use the Vehicle Interference Suppression Kit (Codan part
number 15-00704).
Related links:
Connecting the battery supply on page 395
Wiring techniques
Correct wiring techniques can reduce voltage drop. These include choosing good
connection points and using terminal lugs correctly.
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).
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