With thanks to Tom Hammond N0SS for the fix and Kurt K0ARO for finding the problem,, my K2/100 is fixed. It no longer behaves badly. I moved RFC10 away from the coax connector. Before - http://users.adelphia.net/~hjohnc/05140011.JPG After - http://users.adelphia.net/~hjohnc/05140012.JPG Tom has documented the fix on his website. 73 de K1ESE John