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21-1576_rsj_012604.fm Page 10 Monday, January 26, 2004 11:39 AM
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• The number of nearby CBs operating on the same
channel.
• standing wave ratio (SWR) between the antenna and
the CB.
R
N
EDUCING
OISE
Because your CB is exceptionally quiet, any noise you hear
is probably from an external source in your vehicle, such as
the alternator, another radio, or spark plugs. Your CB has a
noise blanking (NB) circuit to keep background noise to a
minimum. However, strong sources of electrical noise,
generated by spark plugs or the ignition of your car, or
another radio, might be more than the circuit can
compensate for. If you suspect engine noise as a source,
turn off the engine and operate the CB with the ignition set
to ACC. If most or all of the noise stops, the problem is in
the vehicle's ignition or electrical system.
These hints may help reduce or eliminate such noise.
• Replace old ignition wires with new, high-voltage,
noise-suppression wires.
• Install noise suppressors on your spark plugs, or install
new spark plugs that have built-in suppressors.
• Be sure that the black wire ground connection is
securely attached to your vehicle's battery's negative
(GND) terminal or to a good electrical chassis ground.
• If problems persist, check your alternator or generator,
voltage regulator, and any stand-alone gauges. Noise
from these sources can be reduced or eliminated using
bypass capacitors at various output voltage points.
S
W
R
TANDING
AVE
Most antennas are factory adjusted. However, you can
usually improve antenna performance by matching its
characteristics to the CB's RF output power. The built-in
SWR meter enables you to do this. The impedance of a
CB's output compared to the impedance of the antenna is
usually slightly mismatched. By adjusting this impedance
ratio to be as close to 1:1 as possible, you maximize the
efficiency of your system.
(SWR)
ATIO
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