Interfering Noises

There are many possible sources of radio interference:
^ One such source is the vehicle ignition system. This high-voltage switching system produces a radio frequency electromagnetic field that radiates at AM, FM, and CB frequencies. Although components have been designed into the vehicle to minimize this concern, the noise is more noticeable if the radio chassis is tuned slightly off channel when listening to FM programs.
^ Vehicle electrical accessories and owner add-on accessories may also contribute to radio interference.
^ There are also many noise sources which are external to the vehicle such as power lines, communication systems, ignition systems of other vehicles, and neon signs.