This is for a friend Tim, It is a 6500. Even at 1 watt it chirps through his mike, any mic he uses. But on a dummy load it stops. He has the GPS installed. I told him he should make a call in but would see what I could find out here as well.
That is what i said too, but he can't see how with only 1 watt. I told him to disconnect the antenna coax for his GPS and try it. It must be getting in somewhere. could be in his mic wires and connections,,thanks Tim