Do not hold down PTT when you are not talking. (This is called dead keying.)

Assist callers with directions, information about road conditions, and any other reasonable requests.

MAXIMUM RANGE

Your CB radio’s transmission range is generally line-of- sight. The maximum range and quality of CB transmissions vary depending on the following conditions:

the type and quality of antenna used.

the height of the antenna’s mounting location — the higher the antenna, the better the signal’s range.

the surrounding terrain — mountains and tall buildings limit the range.

weather conditions.

the number of nearby CBs operating on the same channel.

standing wave ratio (SWR) between the antenna and the CB.

REDUCING NOISE

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. You can determine the noise 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.

To reduce or eliminate such noise:

Make all CB power and antenna wires as short as possible.

Keep the power wires away from the antenna wires.

Be sure the chassis ground connection is secure.

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 noise suppressors.

If problems persist, check your alternator/generator and regulator gauges. You can reduce the noise from these sources by using bypass capacitors at the various output voltage points.

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Radio Shack TRC521 CB owner manual Maximum Range, Reducing Noise