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Originally Posted by Clam_Alert
Do you know how to change the FM modulator's transmitting frequency? It simply sounds like the FM frequency currently being used is competing with a local FM radio station. Moving the modulator's transmission frequency should do the trick.
I don't have the an Invision system (yet) so I can't help you, but check your instructions to see if you can change the frequency. It's often done by moving small DIP switches that I imagine would be located on the control box (or you may have to remove the cover). You'll need to find a frequency that is clean (you don't want even faint radio noise if you can avoid it). Even though you had a dealer install it, you should learn to do this yourself in case you move of if a new radio station springs up on your transmission frequency.
Have you tried just listenting to 88.3 on the car radio or a home stereo? Is it a "clean" frequency as I've described above?
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I work for a radio station and know a little about this. And... I couldn't have said it better myself. That is it for sure. Just to let you know as well, check 88.5 and 88.1 on the dial. Most station use the upper and lower side of a freq to get the best signal. So if you have a station at 88.1 it might be jumping in and out of pahse with 88.5.
Good luck, let us know how you make out.