4- 64 FEATURES OF YOUR VEHICLE
Ionosphere
B750A02A
AM reception
Mountains
Buildings
Unobstructed
area
FM radio station
B750A03A
Ionosphere
FM reception
B750A01A
Obstructed area
Iron bridges
FM broadcasts are transmitted at high
frequencies and do not bend to follow
the earth's surface. Because of this,
FM broadcasts generally begin to fade
at short distances from the station.
Also, FM signals are easily affected by
buildings, mountains, or other obstruc-
tions. These can result in certain lis-
tening conditions which might lead you
to believe a problem exists with your
radio. The following conditions are
normal and do not indicate radio trouble:
AM broadcasts can be received at
greater distances than FM broadcasts.
This is because AM radio waves are
transmitted at low frequencies. These
long, low frequency radio waves can
follow the curvature of the earth rather
than travelling straight out into the
atmosphere. In addition, they curve
around obstructions so that they can
provide better signal coverage.
B750A02A-AAT
STEREO SOUND SYSTEM
How Car Audio Works
AM and FM radio signals are broad-
cast from transmitter towers located
around your city. They are intercepted
by the radio antenna on your car. This
signal is then received by the radio and
sent to your car speakers.
When a strong radio signal has reached
your vehicle, the precise engineering
of your audio system ensures the best
possible quality reproduction. Howev-
er, in some cases the signal coming to
your vehicle may not be strong and
clear. This can be due to factors such
as the distance from the radio station,
closeness of other strong radio sta-
tions or the presence of buildings,
bridges or other large obstructions in
the area.
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