Ignition Noise Interference - Cobra 25 NW Operating Instructions Manual

Ignition Noise Interference

Use of a mobile receiver at low signal levels is
normally limited by the presence of electrical
noise. The primary source of noise in automobiles
is from the alternator and ignition system.
Typically, when signal level is adequate, the back-
ground noise does not present a serious problem.
Also, when extremely low level signals are being
received, the transceiver may be operated with
the vehicle's engine turned off. The unit requires
very little current and therefore will not signifi-
cantly discharge the vehicle's battery.
Even though the Cobra 25 NW has an automatic
noise limiter, in some installations ignition
interference may be high enough to make good
communications impossible. Many possibilities
exist and variations between vehicles require
different solutions. Consult your COBRA dealer or
a 2-way radio technician for help in locating the
source of a severe noise.
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