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18
MAXIMUM RANGE
The maximum range and quality of CB
transmissions vary depending on these
conditions:
• The type and quality of antenna
used
• The height of the antenna’s mount-
ing location — the higher the
antenna, the better the signal’s
range
• The surrounding terrain — moun-
tains and tall buildings limit the
range
• Weather conditions
• The number of nearby CBs operat-
ing on the same channel
REDUCING NOISE
The noise blanking (NB) circuit helps
keep background noise to a minimum.
However, strong sources of electrical
noise (such as your vehicle’s ignition,
another radio, or spark plugs) might be
more than the circuit can compensate
for.
If you use the CB with the engine on,
you can determine the source of the
noise by turning off the engine and oper-
ating the CB with the ignition set to ACC.
If most or all of the noise goes away, the
problem is in your vehicle’s ignition or
electrical system.
Here are a few hints to help you 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 ground connection
(black wire) is securely attached to
either your vehicle battery’s nega-
tive (–) terminal or to the DC power
supply’s negative terminal.
If problems persist, check your alterna-
tor/generator, regulator, and gauges.
Noise from these sources can be re-
duced or eliminated using bypass ca-
pacitors at various output voltage points.
Your local RadioShack store has a wide
selection of noise-suppression accesso-
ries.
21-1573.fm Page 18 Thursday, August 5, 1999 9:22 AM