FM
Fading and drifting stations : Generally , the effective range of FM is about 25 miles ( 40 km ). Once outside this range , you may notice fading and drifting , which increase with the distance from the radio transmitter . They are often accompanied by distortion .
Multi-path : FM signals are reflective , making it possible for 2 signals to reach the vehicle ’ s antenna at the same time . If this happens , the signals will cancel each other out , causing a momentary flutter or loss of reception .
Static and fluttering : These occur when signals are blocked by buildings , trees or other large objects . Increasing the bass level may reduce static and fluttering .
Station swapping : If the FM signal being listened to is interrupted or weakened , and there is another strong station nearby on the FM band , the radio may tune in the second station until the original signal can be picked up again .
AM
Fading : AM broadcast — especially at night . those received directly station to sound altern
Station interference : received directly from frequency , they can in to hear the broadcast .
Static : AM is easily a noise , such as high ten motors . This results in s
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