Radio Shack TRC-442 - Manual (Page 16)

16
REDUCING NOISE
Because your CB is exceptionally qui-
et, any noise you hear through the CB
is probably from an external source in
your vehicle such as the alternator, an-
other radio, or spark plugs.
The transceiver uses an ANL (Auto-
matic Noise Limiter) circuit to reduce
noise. However, if possible, try to elim-
inate the noise by finding its source.
You can determine the noise’s source
by turning off the engine and operating
the CB with your vehicle’s ignition set
to ACC. If the noise is reduced, the
problem is in your vehicle’s ignition or
electrical system.
Here are a few hints to help you re-
duce or eliminate such noise:
• Make all CB power and antenna
wires as short as possible.
• Route the power wires away from
the antenna wires.
• Be sure that the chassis ground
connection is secure.
• Replace old ignition wires with
new, high-voltage, noise suppres-
sion wires.
• Install noise suppressors on your
spark plugs, or install new spark
plugs that have built-in noise sup-
pressors.
• If problems persist, check your
alternator/generator and regula-
tor gauges. You can reduce the
noise from these sources by using
bypass capacitors at the various
output voltage points.
Your local RadioShack store has a
wide selection of noise suppression
accessories.
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