4. Operating System and Equipment
Rece
ption Form of AM/FM Car Audio
VHF channel
s on FM will pass through the
ionosphere directly without reflection, but once they
hit high mountains, high-rise buildings and other
barriers, they will produce reflection. FM spreading
distance is usually about 40~50 kilometers. It will
become shorter when stereo signals are
transmitted.
The ra
dio is far away from the broadcasting
station, so the signals are too weak to be received.
As a result, the radio will only receive noises. When
the car is driven between the areas to receive two
strong stations with a close signal frequency at the
same time, the radio may lose sound suddenly or
produce noise interference.
Although M
W or SW of AM cannot pass
through ionosphere, it will produce diffraction. As a
result, when the radio waves hit high mountains
and high-rise buildings, its spreading distance will
be farther than that of FM. Therefore, it is likely to
simultaneously receive the signals from two AM
stations.
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