Realistic TRC-422A - Troubleshooting and Maintenance; Ignition System Noise Reduction; Basic Troubleshooting Steps

Ignition System
Ignition-type noise can be identified by the fact that it varies with the
speed of the engine. It consists of a series of popping sounds. There are
a number of things that can be done to reduce this type of noise:
1. Use only the “‘radio suppression type” high voltage ignition wire. Most
new cars come already equipped with this type of wire.
2. Inspect the high voltage ignition wire and all connections made with
this wire. Old ignition wire may develop leakage, resulting in hash —
sound (a harsh, hissing sound).
3. If noise still persists, replace the spark plugs with spark plugs that have
suppressor resistors built-in. Be sure to use the correct type for your
vehicle.
Other sources of noise are: generator/alternator, regulator, gauges and
Static discharge. Most of these types of noise can be effectively reduced
or eliminated by using bypass capacitors at the various output voitage
points. We suggest you check your Radio Shack store for a selection of
noise reduction accessories.
SERVICE AND MAINTENANCE
Your Transceiver has been built in accordance with Radio Shack’s
exacting quality control standards. However, it should be treated with
reasonable care accorded any electronic equipment. Avoid exposing it to
severe shock, dirt or moisture.
If you run into problems with the unit, we recommend you check the
following:
1. If trouble is experienced with receiving:
@ Check the VOLUME ON/OFF switch setting.
® Be sure SQUELCH is adjusted properly. Is it over-squelched?
~ @ Check if the unit is switched to an active channel.
@ Be sure the microphone plug is securely in place.
@ Check for good antenna connection.
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