Hello Lately the rig developed this behaviour after a few minutes from warm-up, and most often while transmitting more than a minute or so. (I checked antenna, and observed this into a dummy-load too). My usual power is 10w FM and s.w.r is 1.2-1.4 but than swings to 2.2 and higher. Any ideas? Tks in advance de Isaac, 4Z4TL.