Porsche Workshop Service and Repair Manuals

Grounding Point: All Technical Service Bulletins
Radio - Reception Interference

Subject:

Radio Interference
Model

928S
Group

9
Part Identifier

91..
Number

8508
September 20, 1985
Radio interference complaints may be caused by either external factors, vehicle components, or radio system failure. Therefore, a clear differentiation
must be made between these areas of possible problems.

Below is a troubleshooting guide for radio reception interference:

1.

Interference due to external factors.

Radio reception could be influenced by the following factors:

-

landscape (mountains, trees, poles, buildings)

-

reflection of radio waves (multiple reception)

-

weak broadcasting stations

-

Stations with changing broadcasting power

-

transmitter frequency not adjusted precisely in radio

-

transmitter or frequency overlap (large signal)

-

weather clouds (high pressure area)

-

interference could be considerably stronger for stereo reception than for mono reception

-

strongly changing reception signals