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MAINTENANCE
How
to
Eliminate Radio
Noise
AM
Reception
AM reception noise can often be eliminated by
changing the position of the antenna.
If
you are
located far from the broadcasting station, or in the
mountains, a thick-walled building or a block of
such buildings, radio waves will not be well received,
resulting in unstable reception and increased noise.
If
reception
is
poor, connect a vinyl wire (supplied)
to the
AM
antenna terminal and position it for best
reception.
If
this does not reduce noise or improve
sensitivity, erect an antenna outside the building
and
apart
from the wall. Some noises are peculiar
to a certain broadcasting frequency or a certain time
of day.
These
result from the
nature
of
AM
signals.
In
some cases the noise can be eliminated by ground-
ing
the
amplifier or reversing the power-cord plug
receptacle connections.
FM Reception
Noise during
FM
reception can be generally attrib-
uted to either insufficient antenna input or interfer-
ence from other electrical appliances.
Antenna
input is insufficient when the antenna
is
not
installed properly or when the station
is
far away.
Extend
and
fix
the attached antenna so
that
noise
is
minimized and the antenna input
is
at
maximum.
For
better
results, install an exclusive
FM
antenna
in a position to receive signals most effectively.
If
you use a
T.V.
antenna for both
T.V.
set and
FM
unit with a splitter, make sure
that
the televi-
sion reception
is
not affected.
To
prevent noise,
avoid using a long antenna wire.
FM
reception
is
affected considerably by the trans-
mitting conditions of certain stations: usually their
power and antenna efficiency. You may receive one
station quite well and another poorly.
Noise Common to FM and
AM
In an area with many ferroconcrete buildings, noise
may occur at a particular time of day.
This
noise
is
easily distinguished from
that
discribed above.
To
eliminate such noise, attach a noise arrester to
the
interfering electrical appliances or to the power
source of the 350A.
When
you are listening to an
FM-MPX program, you may notice a noise not heard
with monophonic
FM
broadcasts.
In
some cases,
you can also eliminate
the
noise by setting the
TREBLE
control to "flat" or lower.
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