Volvo 850glt User Manual

Page of 176
1993 Volvo 850 GLT
Because of the limited range of the FM senders and the fact that these waves are very reflective, this 
problem usually occurs with FM reception. If the sender is blocked by buildings or mountains, static can 
result. 
 
Static 
The reason why FM but not AM is audible is covered parking areas, under bridges, etc., is that 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. To help minimize this situation, turn down the treble and turn off loudness. 
pg. 1:35 Cross modulation, FM - reasons for distortion, AM - reasons for distortion 
file:///K|/ownersdocs/1993/1993_850GLT/93850_1_34.html (2 of 6)12/30/2006 9:42:56 AM