On 2/14/2020 9:11 AM, Fred Moeves wrote: > I put 75 resistor and 50 ohm dummy load on each choke and scanned it > with the Rig Expert 230 zoom and it seems fine. Common mode chokes do not affect SWR, and measuring SWR tells nothing about their effectiveness. See http://k9yc.com/2018Cookbook.pdf 73, Jim K9YC