Maintenance; Ignition And Interference Noise - Sondpex RUSX112 Manual De Usuario E Instalacion

9. MAINTENANCE

For System
The following suggestions help you protect the product so that you can
enjoy it for years.
1. Keep the product dry. If it does get wet, wipe it dry immediately.
Liquids might contain minerals that can corrode the electronic circuits.
2. Keep the product away from dust and dirt, which can cause premature
wear of parts.
3. Handle the product gently and carefully. Dropping it can damage circuit
boards and cases, and can cause the product to work improperly.
4. 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.
5. Use and store the product only in normal temperature environments.
High temperature will shorten life of electronic devices, damage batteries,
and distort or melt plastic parts.
10. CAUTION
1. This unit is designed to operate on 12-volts DC, negative ground
electrical system only, do not attempt to install this unit in a vehicle
having a positive ground system.
2. Your unit has built-in filtering to eliminate most of the noise that might
come through the power source. However, with some vehicles,
particularly older models, some clicking or other unwanted noise might be
present.
11. IGNITION AND INTERFERENCE
NOISE
Ignition
The most common source of noise in reception is the ignition system. This
is normally due to the fact that radio is 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/Amateur radio or electronic supply
shops.
Interference
Radio reception in a moving environment (automobile) is very different
from reception in a stationary (home). It is very important to understand
the difference.
FM reception is just the opposite of AM. It is not subject to environmental
noise and it does not have the ability to be received at great distances
(usually 30 miles=48 km). Also, the FM signal can be blocked by tall
buildings, mountains, or hills.
To reduce the possibility of these problems, ALWAYS FINETUNE a
station, and if possible, set the antenna height to 30 inches (=76.2cm).
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