Hyundai 2009 Sonata - Manual (Page 125)

1 FEATURES OF YOUR HYUNDAI
112 STEREO SOUND SYSTEM
B750A02A-AAT
How Car Audio Works
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.
AM and FM radio signals are broadcast
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. However,
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 stations or the presence of
buildings, bridges or other large
obstructions in the area.
FM broadcasts are transmitted at high fre-
quencies and do not bend to follow the
earth's surface. Because of this, FM broad-
casts generally begin to fade at short
distances from the station. Also, FM signals
are easily affected by buildings, mountains,
or other obstructions. These can result in
certain listening conditions which might
lead you to believe a problem exists with
your radio. The following conditions are
normal and do not indicate radio trouble:
Ionosphere
B750A02L
AM reception
Mountains
Buildings
Unobstructed
area
FM radio station
B750A03L
Ionosphere
FM reception
B750A01L
Obstructed area
Iron bridges