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264
YARIS SEDAN_OM_OM99S50z_(U)
4-2. Audio System
Signals from an FM transmitter are similar to beams of light
because they do not bend around corners, but they do reflect.
Unlike AM signals, FM signals cannot travel beyond the horizon.
Therefore, FM stations cannot be received at the great distances
possible with AM reception.
Ionosphere
FM wave
AM wave
60 - 120 miles (100 - 200 km)
Obstruction
Atmospheric conditions can also affect FM reception. High humidity
will cause poor reception. However, cloudy days may provide better
reception than clear days.
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