So, I'v had this problem with my KY197 since it was new to me, 123.00 always has the squelch open,not any other channel just this one. Bad circuit in the radio right or adjustment. So I'm finishing up my strob light install and I bumped the dash trim plate and the squelch closes. So I hit it again, and it closes. Then grab the two bars and lift myself up putting alot of weight on the tubes and the squelch closes. Grounding problem right- well not so fast. I made up a ground wire and touched everthing on the planet trying to close the 123.00. Nothing except when I push the trim plate into the tube. I cannot conclude its a ground problem. I've got grounds going everywhere. Anybody have any ideas or maybe it's still the radio. I've never seen anything like it. The airplane is my Jones Super Cub experimental. 450TT SNM.