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OBSERVATION OF
FM
MULTIPATH
RECEPTION
FM
signals are
reflected
from
objects such
as
large buildings
or hills,
etc. and arrive at the antenna from many directions.
The signals sometimes become
distorted.
If
multipath reflection
can be
checked,
this type of distortion
can be eliminated
or
minimized by repositioning or changing
the
antenna.
If
an FM tuner
provided
with
FM multipath
terminals
is
available,
FM
multipath reflection can be
checked
by
the
following
steps.
1.
Connect
the
MULTIPATH OUTPUT terminal
of
FM
tuner
to
the FM MULTIPATH
INPUTS
of
the
SD-1100
with the
supplied cord.
Note that the
upper
jack of
the
FM MULTIPATH INPUTS
of
the SD-1100 is
for
vertical
(VERT) and the lower jack is
for
horizontal
(HORIZ)
as
shown
in Fig.
30.
2. Set
the FUNCTION
SWITCH
to
FM MULTIPATH.
3.
Adjust
the
amplitude
of
the
pattem
on the
screen by
controlling the VERTICAL GAIN KNOB
and
the
HORI-
ZONTAL GAIN KNOB.
4. Select an
FM station which
is located
far from your
area
and tune
in
to
the station at the time
an announcement
is
being made.
5.
If
there is no multipath reflection, the
screen
will
show
a
straight horizontal
line
as
in (A)
of
Fig.31.
If
there
is
much multipath reflection, the
screen
will
show
various
patterns
as
in
(B). Reposition or redirect the
antenna
so
that the pattem on
the
screen becomes
as
close
as
possible
to
a
straight line.
(A)
Fis.
so
CHECK
OF ANTENNA DIRECTION
IS REOUIRED.
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31
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