Volvo 740 1991 Owner's Manual page 43

Volvo 1991 740 Model
distortion can result.
Distortion
The reason why U(FM) but not M/L (AM) is audible is covered parking areas, under bridges, etc., is that
U(FM) signals reflect against solid objects such as buildings. Because these waves are very reflective,
static can result. This static is the result of the reflected signal and the direct signal reaching your
antenna at slightly different times causing a cancellation of all signals. This problem occurs largely in
built-up areas.
pg. 1:26 Cross modulation, U-(FM) - reasons for distortion, M/L (AM) - reasons for distortion
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