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RE: Secondary Topload ( was New formula for secondary resonant frequency)
Original poster: "John H. Couture by way of Terry Fritz <twftesla-at-uswest-dot-net>" <couturejh-at-worldnet.att-dot-net>
I visited your web site and entered the numbers from your B&W coil into the
on line JHCTES Ver 3.2 computer program. It appears that your coil's top
load capacitance does not change when placed on the secondary. This
contradicts past belief that the topload changes when on the coil because of
ion clouds, etc. Maybe it was because in the past the program inputs were
not accurate enough and the tests were not precise enough. This is something
that will have to be researched with further tests.
For the Primary I entered Cap = 0.1094 uf, Avg Rad = 13.335, and Width =
For the Secondary I entered Rad = 7.9, Turns = 821,
TPI = 11.79, and Sec Term = 69.59 pf
The operating frequency was 68.72 Khz, Pri Ind = 49,03 uh,
Pri turns = 7.12, etc.
The Sec Term = 69.59 is the calculated pf for the toroid you used and also
agrees with the Toroid graph I show in one of my books. No change was made
in the capacitance for ion cloud or any or condition.
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Sunday, February 04, 2001 12:03 PM
Subject: Re: New formula for secondary resonant frequency
Original poster: "Kurt Schraner by way of Terry Fritz <twftesla-at-uswest-dot-net>"
thank you very much for the good news about usefulness of my
results. I'd like to give you the most complete experimental
doc's of my coils, ...but, if it comes to precision: it's a
bottomless pit! ;o). Even geometric data appear doubtful!
> Agreed. In the case of the B&W coil, the lack of a well defined
> ground surface provides an ambiguous termination of the external
> E-field, so the coil is outside the domain of the formula.
In fact, all my measurements suffer from this shortcoming. The
situation for B&W may be seen at