Yes it locked up with "TX:14.225.00" etc displayed on the second line of the LCD except some of the characters were garbled with nonsense patterns. A capacitor across the PTT line and ground on the back of the mic connector fixed it.
I also have an additional relay connected to the PTT to key up my linear (as per N6QW see attached ) which I guess doesn't help, but the amplifier wasn't plugged in at the time so it only took 10 watts of RF coming in on the PTT line to screw it up.
M0WWS?
