Hyundai Bi3, Owner'S Manual

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How vehicle audio works
FM reception FM reception
JBM001 JBM001
AM and FM radio signals are broadcast
from transmitter towers located around
your city. They are intercepted by the
radio antenna on your vehicle. This
signal is then processed by the radio and
sent to your vehicle 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 reception FM reception
JBM002 JBM002
AM broadcasts can be received at
greater distances than FM broadcasts.
This is because AM radio waves are
transmitted at low frequencies. These
long distance, low frequency radio
waves can follow the curvature of the
earth rather than travelling straight. In
addition, they curve around obstructions
resulting in better signal coverage.
FM reception FM reception
JBM003 JBM003
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
within short distances from the station.
Also, FM signals are easily affected by
buildings, mountains, and obstructions.
This can lead to undesirable or
unpleasant listening conditions which
might lead you to believe a problem
exists with your radio.