Sansui G-9000 - Reception Improvement

46
re ae Multi-path phenomenon
Phénoméne a
multi-trajets
Mehrwegphanomen
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),
processing
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
section.
In
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.
Weak
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:
*
Improper
antenna
location.
Use
of
a
low-gain
T-shaped
antenna.
(Replace
it
with
an
outdoor
antenna.)
*
Nearby
electric
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.