Realistic TRC-422A - Noise Interference in Mobile Operation

A. The vertical ground plane antenna is the most popular fixed station
antenna. It is omni-directional and provides good performance for
contacting other fixed and mobile stations. For medium-long range
communications. We suggest Radio Shack 21-901.
B. The coaxial antenna is a high-efficiency radiator with omni-directional
characteristics. It performs as well in most applications as the ground
_ plane. For medium-long range communications. Try 21-902, 21-1133
or 21-964.
C. The directional beam antenna provides maximum gain and maximum
directivity. The directivity can be a disadvantage unless a rotor is used.
Since a beam antenna is directional, it greatly reduces noise and inter-
ference from all other directions. For long range communications.
The antenna system should be adequately grounded.
Always use a lightning arrestor for your antenna system.
For maximum efficiency, we strongly recommend using an SWR meter
to aid in the proper matching of your antenna and Transceiver.
Your Radio Shack store carries a complete line of base station CB
antennas and accessories.
For more information, we recommend that you obtain a copy of CB
RADIO FOR TRUCKS, CARS AND BOATS, at your Radio Shack
store.
NOISE
In Mobile operation, your vehicle or boat can be the cause of much noise
interference. Since the receiver section of your transceiver is very
sensitive, it will pick up even the smallest noise signals and amplify them.
Any noise that you hear in the Transceiver is almost totally 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) Circuit. You must solve the problem
at its source.
To find out if the noise is from your ignition system, try this simple test.
Turn off your ignition switch and set it to ACC (accessories). This turns
off the ignition, but supplies power to the Tarnsceiver. Most of the noise
will probably disappear, indicating that the source of noise is your
vehicle’s ignition or other electrical systems.
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