Noise
filter installed in the radio
A noise filter is designed to reduce or eliminate noise that
the radio is receiving through the power cord. The noise filter
is primarily designed to eliminate alternator whine, windshield
wiper noise, and blinker noise. This filter is designed in
house by Clays Radio Shop technicians. It has more filtering
capabilities than off the shelf filters costing twice the
price of our filter. Over the years we have tried many high
end filters offered by several manufactures and they simply
don't work well. We have designed this filter to do what a
noise filter is intended to do, eliminate electrical noise.
Other
Types Of Noise &
Possible Cures
There are many sources of noise in the radios receiver. Each
noise type must be dealt with in a unique way. TV, phone chargers,
inverters, AC fan motors, refrigerators, coolers, and radial
tires can all generate a significant amount of noise in the
radios receiver. Try these recommendations if you have excessive
noise and can not seem to pinpoint the source.
Find a channel on the radio that has no traffic from other
radio users. Turn the RF gain all the way to the right. Notate
the amount of noise level in S units by your signal meter
in the radio. Unplug each device, one at a time. TV, phone
charger, inverter, refrigerator, and cooler. Look at the signal
meter and notate any reduction in noise level after each device
is unplugged. When you see a significant drop after a particular
item is unplugged you have pinpointed the source. You can
verify AC fan motor noise by turning the fan to the maximum
position. If you see the meter on the radio raise you have
fan motor noise.
Noise from radial tires can be verified with the same procedure.
Find a channel on the radio that has no traffic from other
radio users. Turn the RF gain all the way to the right. Notate
the amount of noise level in S units by your signal meter
in the radio. Now, drive down the highway at highway speed
limits. If the noise level increases you have noise from the
tires.
Once the source has been pinpointed you may try our recommendations
in order to reduce or eliminate the noise.
Phone Charger - Install a ceramic disk capacitor
(value .001) close to the cig plug from the positive wire
to the negative wire.
Cooler - Install a ceramic disk capacitor
(value .001) close to the cig plug from the positive wire
to the negative wire.
AC Fan motor - Install a ceramic disk capacitor
(value .001) from the positive wire to the negative wire as
close to the fan motor as possible. Install two additional
ceramic disk capacitors, one from the ground wire to the case
of the fan motor and one from the positive wire to the case
of the fan motor.
Radial Tires - Purchase anti static/tire
balancer from an auto parts suppler. Fill each tire with the
recommended amount (per your tire size)
TV - no cure, unplug the TV when not in
use.
Inverter - If your inverter produces noise
you have an inverter that uses a modified sign wave. The cure
is to replace the inverter with another type that uses a pure
sign wave.
Refrigerator - no cure. The noise is produced
from the compressor.
Other Source and the cause.
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