21-1573.fm Page 18 Thursday, August 5, 1999 9:22 AM

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.

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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.

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Samsung TRC-445 owner manual Maximum Range, Reducing Noise