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FM reception characteristics
In general, FM has much better tonal quality than AM. However, FM and FM
stereo reception encounter several characteristic problems not encountered
with AM. FM is more difficult to receive than AM in a moving vehicle. The
following are explanatory notes on what to expect from FM reception and on
how to get satisfactory performance.
FM RECEPTION DIFFERS FROM AM
A characteristic of transmitted signals is that lower frequencies travel
further. FM frequencies are much higher than AM's (similar to a ray of
light): they won't bend but they will reflect. Often, they will be
interrupted by tall buildings, mountains, etc., taking direct and indirect
paths to your vehicle's antenna. The distance at which FM stations can
be received satisfactorily is usually not nearly as far as that which AM
stations can be received.
AM Radio Waves
FADING OUT
In weak signal or "fringe" reception areas, FM stations may fade out
completely, or fade in and out. When driving in weak signal areas, such
as near hills, through valleys or tunnels, among tall buildings, etc., you
may encounter unusual noise interference. THIS IS NOT A TUNER
PROBLEM. In this case, you can only wait until you are in a better
reception area, tune to a stronger station, or reduce the treble level.
Ionosphere
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FM Radio Waves
Ionosphere
How to operate the tuner
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