Hints On Use - Sansui TU-70 Operating Instructions And Service Manual

HINTS ON USE
HOW TO ELIMINATE UNPLEA-
SANT RADIO NOISE
A) AM BROADCASTS
An AM radio noise is often eliminated simply
by replacing the antenna.
Usually the noise is heard in the area where
the station signal is too weak due to topogra-
phy, buildings etc. To eliminate it, connect
PVC wire to the AM antenna terminal of
this tuner and put it up on the wall of your
listening room. If the noise is stil heard or
the sensitivity of the tuner is stil poor, an
outdoor antenna should be installed.
A noise may be heard depending time, fre-
quency, station etc. To eliminate such a noise,
ground the tuner or turn the power plug
upside down.
B) FM BROADCASTS
There are two trouble-sources in the FM radio
noises: one is caused by the insu6cient anten-
na input and the other is caused by other
electrical appliances placed near the amplifier.
The poor antenna input is due to badly in-
stalled antenna or remoteness from the station.
In the latter case, set the FM sensitivity
switch at ' 'DISTANT". Change the height
and direction of the FM antenna (supplied).
If the noise is stil heard, use an outdoor
antenna exclusively for FM reception.
Note that an excessively long antenna may
rather cause a noise.
The sensitivity of the tuner varies depend-
ing on the transmitting conditions of the sta-
tion. It happens, therefore, that one station
signal is well received but the other station
. signal is il received.
C) NOISE COMMON TO FM AND AM
BROADCASTS
If you live in a closely built-in area, noÌses
may be caused by some outside factors. To
eliminate, install a noise arrester with the
electrical appliances or the power source of
the amplifier.
D) FM MPX STEREO
When you are tuned to an FM multiplex
program, you may notice a noise which does
not accompany monaural FM broadcasts. This
does not mean that your tuner is out of order.
In such a case, turn on the noise filter. In
some cases, you can eliminate the noise by
setting the treble knob of the amplifier flat
or lower.
E) FM MPX STEREO ON MONO
When you receive FM multiplex stereo broad-
casts monophonically-with the selector at
"FM"-the sounds from both speakers mix
into a monaural reproduction as if you are
tuned to an ordinary monaural FM station.
Use this method if you find too much noise
when receiving an FM multiplex stereo broad-
cast because the waves, field intensity or input
are inadequate.
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