For completeness, here's the data referred to by G3RBJ in his paper: http://www.g3ynh.info/zdocs/magnetics/appendix/Toroid_selfC.html Notice how the self-capacitance falls as the number of turns increases. Steve G3TXQ On 04/01/2018 11:25, Steve Hunt wrote: > Wes, > > Thanks, I hadn't spotted that one! > > Steve G3TXQ >