When i push the momentary switch, the TX light goes on and stays on until I exit the menu system and I hear a relay engage?? Would a relay engage on a final oscillation? .? I tried the dummy load and got the same results. Your point of RF feedback is well taken.? Since the switch is momentary, it does make sense that it may be oscillation.? I installed the pull-up? resistor but had difficulty in doing so. I will re-investigate the pull-up resistor? It may not be working properly.