Mitsubishi Eclipse Workshop Manual page 674

54-36
AUDIO SYSTEM
-
Troubleshooting
A-2
Noise appears
at
certain places when traveling (FMl.
Do
the following measures eliminate
the
noise?
Change
to
a
different station with
a
strong
signalto
boost resistance to interference
Suppress high tones lo
reduce noise.
Extend anlenna completely.
lf there
is more noise
than
other radios, find out the noise condiliorrs
and
the
nanre and
f
requency of the receivinq stattons
f
rom lhe
user.
and consult wrth the servtce center
NOTE
About
FN4
raraves:
FM waves have the sanre properties as light.
and
can be
deflected
and blocked. Wave reception
rs
not
possrble in the
shadow
of
obstructions such
as
buildings
or
nrountains.
1.
The signai becomes
.weak
as
the distance from
the
station's transmission antenna
increases.
Although this
may vary according to the
signal
strength of the transmitting station
and
interven-
rng geographical formations or
buildings. the
area
of good reception
is
approx. 20
-25
km
(12
-
16
miles) for stereo reception, and 30
-
40 km
(19
- 25
miles)
for
monaural reception.
2.
The
signal becomes weak
when an area
of
shadorn,
from the transmitting anlenna
(places
where there
are
obstructions such
as
mountains
or buildings between the
antenna and the
car),
FM Broadcast Good Reception Areas
and noise
will appear <This
is calted
firsr fading,
O
and gives
a
steady buzzing notse.>
lf
a drrect
signal hrts
the
antenna
at the
same
time as
a
sigl-ral
reflected by obstructions
such
as
mountatns
or
buildings, interference of
the
two
signals
will generate
noise.During traveling,
noise will
appear each time the vehicle's
anten-
na passes through
this
kind of obstructed
area.
The strength and interval
of the
noise
varies
according
to the
signal strength and the
condi-
tions
of
deflection. <This is
called
multipath
noise. and
is a
repetitious buzzing.>
Since FM stereo transmissron and reception
has
a weaker field than monaural,
it
rs
often
accom-
panied by a
hissing
noise.
FM Signal Characteristics and Signal tnterference
4.
as,
oo$-g!
For
home slereos:
80-9O
km
(50-56
miles)
164O363
For monaural:
30-40
km
(19-25
miles)
O
Mitsubishi
Motors Gorporation
Apr.
1991
PUyUE9010
l'"