Using the 9350 Automatic Tuning Whip Antenna with a 2110 Manpack Transceiver
56 Manpack Transceiver 2110 series Reference Manual
Low-voltage wiring
The low-voltage wiring from the coil to the contact-breaker points on the distributor
must:
• be as short as possible
• not be included with other wires in a harness or loom
This wire must be shielded if it is greater than 300 mm (12 in) long (see page 58, Noise
suppression). A suitable shield can be provided by a twin flex or ‘figure eight’ cable
(consisting of two conductors).
Shielding is achieved by:
• connecting each end of one of the conductors to a good earth
• connecting the other conductor in place of the original wire
Coil-to-battery wiring
A low-pass filter, such as a Marine Technology type MAR-ACE, should be fitted at the
coil end of the battery wire. The earth connection of the filter should be short and bonded
to the coil body.
Noise from the vehicle’s battery-charging system
Alternator/generator-to-battery wiring
A low-pass filter, such as a Marine Technology type MAR-60A (up to 60 A), should be
fitted to the main battery lead at the alternator to minimise noise. The filter must be rated
for the maximum current available from the charging system. The earth lug of the filter
should attach to the alternator body or the engine block.
Alternator-to-regulator control wire
The alternator-to-regulator control wire carries switching pulses that often contribute
noise to the receiver.
To minimise noise:
• separate the regulator control wire from all other wiring
• keep the wiring as short as possible
If the wiring is longer than approximately 300 mm (12 in), it should be shielded.
WARNING
Suppression via capacitors or filters is not an option because it may cause
damage to the regulator.
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