Once you check out the site I mentioned earlier (print it out) start at
the GPS wiring, where it's signal is being sent to whatever...
computer, VHS, SSB, etc. That's most likely where the problem is.

Keith wrote:
Once you check out the site I mentioned earlier (print it out) start at
the GPS wiring, where it's signal is being sent to whatever...
computer, VHS, SSB, etc. That's most likely where the problem is.

As I replied earlier, the problem is radiated noise from the Danfoss
BD50 compressor control module. I have turn every electrical item on the
boat on and off individually to determine which, if any, generate noise,
either via the DC wiring or radiated. None cause a problem except the
compressor module. Glenn Ashmore provided the part numbers of shielded
control modules. I believe that when I finally find a place to purchase
one, my problem will be solved.
krj