Following up on the CB interference I mentioned in my previous post, I had a look over the weekend at what was causing the problem.

With the engine off, I was able to transmit without any problems on the empeg. As soon as the engine's running, it causes interference during transmit.

Rather than be totally scientific, I swapped my CB for another one and tried that.

Guess what? No interference. Swap the old one back in, BUZZZZZZ!

So it looks like there's something wrong with the CB that is causing this. The unit itself has had trouble with squelch control and occasional transmit problems, so I suspect it's on the way out - probably voltage regulation problems?

One point of note; the power tap-off point for the CB and the empeg is the same, so there's obviously some influence there.

Pictures to come.