Re: what is value of two toroids for topload?

["Barton B. Anderson" <tesla123-at-pacbell-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Hi John M., 

The lower toroid will shield part of the upper toroid from ground and it will
loose some capacitance. The toroid stand-alone capacitance will decrease with
secondary size as well. You could throw in a value of percentage (e.g. 65%),
but I believe this value will change from system to system. You could at least
measure Fo, and back-calculate the capacitance of the top load. This would at
least show you the capacitance for your system (to a few percent accuracy). The
distances the toroid is above the coil also affects the top capacitance to some
degree. 

Bart 

Tesla list wrote: 
>
> Original poster: "John Morawa" <morawaj-at-interaccess-dot-com> 
>
> Hello, 
>
> When changing the topload from a one toroid to a two toroid configuration 
> (small toroid on bottom, large on top) how do you calculate the total 
> capacitance?  Does it go down (caps in series) or does it actually increase? 
> I want to know so I can adjust the QTC.XLS spreadsheet appropriately. 
>
> P.S.  Thanks everyone for all the input about increasing primary tank 
> capacitor size. 
>
> Thanks, 
> John M.