JRV212T
21
CARE AND MAINTENANCE
•
Keep the product dry. If it does get wet, wipe it dry immediately. Liquids might contain minerals
that can corrode the electronic circuits.
•
Keep the product away from dust and dirt, which can cause premature wear of parts.
•
Handle the product gently and carefully. Dropping it can damage circuit boards and cases, and
can cause the product to work improperly.
•
Wipe the product with a dampened cloth occasionally to keep it looking new. Do not use harsh
chemicals, cleaning solvents, or strong detergents to clean the product.
•
Use and store the product only in normal temperature environments. High temperature can
shorten the life of electronic devices, damage batteries, and distort or melt plastic parts.
Ignition
The most common source of noise in reception is the ignition system. This is often a result of the
radio being placed relatively close to the ignition system (engine). This type of noise can be easily
detected because it will vary in intensity of pitch with the speed of the engine.
Usually, the ignition noise can be suppressed considerably by using a radio suppression type high
voltage ignition wire and suppressor resistor in the ignition system. (Most vehicles employ this wire
and resistor, but it may be necessary to check them for correct operation.) Another method of
suppression is the use of additional noise suppressors. These can be obtained from most CB/A
radio or electronic supply shops.
Interference
Radio reception in a moving environment (automobile) is very different from reception in a stationary
(home) environment. AM reception will deteriorate when passing through a tunnel or when passing
under high voltage lines. Noise can be picked up from passing automobiles. Although AM is subject
to environmental noise, it can received at great distances. This is because broadcasting signals
follow the curvature of the earth and are reflected back by the upper atmosphere.
