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Greetings, I recall reading of someone building a coil with a second tank circuit, that is a second primary with resonant cap.. Supposedly, it improved the Q of the overall circuit, however, it reduced the output of the secondary significantly. As I would suspect. All the best, Mike On Nov 4, 2014, at 7:17 PM, dave pierson <dave_p@xxxxxxxxxxx> wrote: > > ... >>> I don't know of anyone building a stack as you described. >>> Unless you want to see a lot of FCC trucks in your neighborhood, I >>> don't think you want your coil to be a good RF radiator. > > ... >>>> Has there ever been a coil built with 3 primary coils ie a large one on >>>> bottom not connected to anything the normal in middle in circuit and a >>>> smaller one on top. Like a vertical yagi with driver element >>>> reflector? If there's any hams in this group they will know I mean I >>>> hope. > > I've never heard of such, which means little. > My understanding of Yagi principles is that > the various elements 'need' to be separated > by sizable fractions of a wavelength: > 0.1 or so? > > This would be a bit if a challenge at typical > Tesla Coil frequencies... > > best > dwp > _______________________________________________ > Tesla mailing list > Tesla@xxxxxxxxxx > http://www.pupman.com/mailman/listinfo/tesla _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla