Tesla List wrote: > > Original Poster: Philip <shadow42-at-totcon-dot-com> > > The coil is 4.5" x 20" #24 awg unloaded I 234khz. > Philip Philip, Using an estimte of self capacitance and coil inductance, I get an unloaded frequency for a coil this size that's closer to 400 to 420 kHz... It would drop down to the range of 230 kHz only with a fair amount of topload (14-15 pF). How'd you arrive at 234 kHz for your coil? -- Bert --