See this app note. http://www.elecraft.com/manual/KX3%20Tuning%20Noise%20Mod%20rev%20B3.pdf -- View this message in context: http://elecraft.365791.n2.nabble.com/KX3-tuning-noise-on-12M-tp7610099p7610120.html Sent from the Elecraft mailing list archive at Nabble.com.