Volvo S70 Owner's Manual page 290

1999 S70 & V70
Cross modulation
If you listen to a weak station in the vicinity of a stronger one, both stations may be received
simultaneously. If the car is moved a short distance, the weaker signal may be heard more clearly.
FM - reasons for distortion
FM is affected by the electrical systems of nearby vehicles, especially those without suppression. The
distortion increases if the station is weak or poorly set.
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