A good friend who I work with, has a 48t that will jump channels when he keys the mike. I've looked it over, and although I can usually figure out what's wrong with them as long as it's a minor problem, I just can't find out what the ailment is. My only advise to him, which was given to me by an old diesel mechanic years ago was " If a hammer won't fix it, then it must be an electrical problem". Needless to say, he was hoping for a little more from me. If anyone has any ideas out there, I (we) would greatly appreciate it. Thank You, Bigrigger73