On Mon,9/29/2014 10:43 AM, wb6rse1 at mac.com wrote: > Bill - An effective common-mode choke can be made with 17 turns of RG58-coax wound on to an Amidon FT240-31 core. It's not an Amidon core, it's a Fair-Rite core. It's a LOT cheaper when you buy from a Fair-Rite distributor. See Appendix One of k9yc.com/RFI-Ham.pdf 73, Jim K9YC