Technics ST-8080 Bedienungsanleitung Seite 9

This unit includes a highly sensitive ferrite-bar antenna for
reception of AM broadcasts and, therefore, there should be
no necessity for connection of an outside antenna except in
an area where signals are especially weak.
FERRITE-BAR ANTENNA
While listening to an AM broadcast, move the ferrite-bar
antenna away from the surface of the rear panel and secure
it in the position where reception is best.
Note: If the AC power cord or speaker wires are near the
ferrite-bar antenna, interference noise may be heard.
Never lift or carry this unit by using the ferrite-bar
antenna as a handle.
In weak-signal areas distant from broadcast stations, or ina
reinforced concrete building, this ferrite-bar antenna alone
may fail to provide good reception of AM broadcasts. If so,
connect a length of vinyl wire to the AM antenna terminal
(marked "AM ANT,"' on the rear panel). Then place this
wire outdoors and use it for an antenna terminal a short
distance away from the building. Because the sensitivity
of an outdoor antenna varies greatly with its position,
install it in the position which affords the best reception
while actually listening to a broadcast. For safety reasons,
the antenna should include a lightning arrester.
AM outdoor antenna
"AM ANT"
terminal
Vinyl-covered wire
When the unit is correctly grounded, noise interference
during broadcast reception is reduced.
When grounding, use vinyl-covered wire and add a copper
strap to the end of the wire, which should either be buried
or connected to a water pipe for efficient grounding.
Absolutely never attempt to connect this wire to a gas pipe.
rae a e
|
CAUTION 00 ft Re NE SCREWS. SEE BOTTOM NOTICE,
Ground terminal ('GND')
Viny!-covered wire
Mii:
Ground bar
Reflected
waves
Direct waves
Multi-path
interference
i , Special
} antenna
for FM
reception
Transmission
antenna
\
FA FGF
| oh oe
ABOUT MULTI-PATH DISTORTION
FM signals, in the same way as light waves, have a tendency
to move in a straight line, and, when they encounter an
obstruction, are reflected. Because of this characteristic,
if there are tall buildings, mountains or other similar ob-
structions nearby, signals which are received directly
from the broadcasting station antenna and signals which
are reflected from the obstruction will reach the receiving
antenna simultaneously, and the interference which results
when the two signals mix is known as multi-path interfer-
ence and causes distortion.
Such distortion is called ''multi-path distortion.'' This
signal distortion passes through the IF stage of the tuner
and ultimately appears as distortion in the reproduced
sound.
In order to receive FM broadcasts in the optimum condi-
tion, therefore, it is necessary to install a special antenna
for FM reception, and to face it in the direction in which
the reception of such multi-path distortion is minimized.
For this reason, this unit includes special multi-path output
terminals which are used for the detection of multi-path
distortion.