Volvo 240 1991 Owner's Manual page 45

Volvo 1991 240 Model
Sending signals
The U (FM) waves do not follow the earth's surface, nor do they bounce off the atmosphere. For this
reason their range is limited.
The M, L (AM) waves follow the earth's surface and reflect against the atmosphere. This gives them a
wide range.
Weak reception (fading)
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