Noise Reduction - Radio Shack TRC-495 Owner's Manual

21-1579.fm Page 15 Thursday, August 5, 1999 9:34 AM

NOISE REDUCTION

Since the receiver section of your CB
is very sensitive, it easily picks up
even the smallest signals and ampli-
fies them. Any noise that you hear
from the CB most probably originates
from external sources. The receiver
itself is exceptionally quiet.
If the noise is continuous and fairly
loud, it cannot be totally eliminated
by the automatic noise limiter (ANL)
and noise blanker (NB) circuits. You
must solve the problem at its source.
The sources of noise might be high-
voltage power lines, fluorescent
lights, electrical motors, automobile
ignition systems and so on. Also, in-
correct installation of your CB, anten-
na, or cable might cause noises.
• Try relocating
antenna away from any noise-
generating sources.
• Provide a good ground for your
antenna with UL-listed compo-
nents.
• Ensure a good shielding con-
nection in the antenna coaxial
cable. Check the connectors
and cable, and make repairs if
necessary.
• Check the routing of the antenna
cable. Reroute the cable away
from any
sources.
your CB or
noise-generating
In some cases, an AC line interfer-
ence filter added to the AC input of
your CB can help. If a particular ap-
pliance or motor seems to be the ma-
jor cause of noise, try to reduce or
eliminate that noise problem at the
source (the appliance or motor). You
can find many useful accessories in-
cluding AC line interference filters,
cables, and connectors at your local
Radio Shack store.
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