My thanks to K9YC, KZ1W and everyone else who replied. Steve WB6RSE > > On Jun 9, 2013, at 6:57 PM, wb6rse1 at mac.com wrote: > > G3TXQ shows characteristics for common mode chokes: > > http://www.karinya.net/g3txq/chokes/ > > Has anyone built the 17T of RG58 on an FT240-31 choke and verified the performance? >