On 1/21/2020 7:28 AM, Andy KU7T wrote: > I am a choke newbee, As others have suggested, three tutorials on my website provide the technical background. k9yc.com/RFI-Ham.pdf and http://k9yc.com/CoaxChokesPPT.pdf explain the concepts, and http://k9yc.com/2018Cookbook.pdf provides detailed building guidelines. 73, Jim K9YC