Operating instructions

-
JO
Some useful
hints
Compared
with AM, FM is inherently
of
higher
quality
with less noise
and
less interferences.
Here
are some
hints
for
further
improved FM
reception.
Multi-path
phenomenon
and antenna
alignment
FM waves
are directional
(more
directional than
AM),
possessing
a
tendency
to beam
in a straight
line.
When hitting
an obstacle,
they
simply reflect.
Antennas
receive the
waves reflected by
nearby
obsta-
cles
(such
as
mountains or
tall buildings) as
well as
the
wave beamed
direct
from the
station.
The result is a multi-path
phenomenon,
the
same
problem
as the
cause of
"ghosts"
on TV screen. ln
FM, reflection
can
cause distortion and
poor
stereo separation.
Use an
FM
antenna
with
good
directionality
and align
it correctly to minimize
such
dis-
tortion
-
Wek
antenna
input-When antenna
input is too weak, the
signal-to-
noise ratio
(the
relative
levels of the desired
vs. the noise
generated
inside
the
unit and
by extraneous
signals)
may
deteriorate.
The causes
may be:
*
lmproper
antenna location.
*
Use of
a low-gain
T-shaped antenna.
(Replace
it with an outdoor
antenna. )
Noarby
el€ctric
appliances-Pulsive
noises, caused by electrical sparks,
may be
mixed
into
audio signals.
Major sources of such
noises are
automobiles
(ignition
plugs),
electric trains,
high-tension lines, fluore-
scent
lamps,
welding
machines,
etc. Therefore,
you
suffer
less noise
when the
antenna
is
placed
as
far away as
possible
from such sources of
noise.
a
---'
Multi-path
phenomenon
Ph6nomdne e
multi-trajets
Mehrwegphanomen