At the meeting last night someone said to check with K5YC for more info on RF chokes, but they were not sure. The call they were looking for is K9YC. I found this info from K9YC. http://audiosystemsgroup.com/RFI-Ham.pdf http://audiosystemsgroup.com/CoaxChokesPPT.pdf Enjoy, lots of info. 73, Vant K4LM