2000 Saab 9-5 Owner's Manual - Page 97
2000 Saab 9-5 Manual
Page 97 highlights
Saab 9-5 Audio System FM 97 AM IB391 IB390 Sources of FM interference Interference to FM reception can be caused by the electrical systems in other vehicles, particularly if the signal from the transmitter is weak. Cross-modulation When the radio is tuned to a weak transmitter in the vicinity of a stronger one, the car's antennas will receive signals from both. Such interference is apparent when the unwanted broadcast can be heard faintly in the background. Radio waves, FM/AM FM radio waves radiate in straight lines from the transmitter. Because such waves do not follow the curvature of the Earth, their strength becomes weaker the further they travel. AM waves, on the other hand, are reflected off the ionosphere, thus greatly extending their range. IB388
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