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RE: Tesla calculator frustration.

Original poster: "John H. Couture by way of Terry Fritz <twftesla-at-qwest-dot-net>" <couturejh-at-worldnet.att-dot-net>

Bill -

You should tap your primary at 7.6 turns. Enter the following into the
JHCTES Ver 3.2 program.

Pri cap        .06
Avg rad        6.8
Width          3.8

Sec rad        3.31
Turns          1000
Turns/inch     36.19   1000/27.63
Sec term       35.0

Oper freq      123.43 Khz

The operating frequency will depend on the secondary terminal capacitance.
Vary this parameter and view the change in operating frequency. When the
toroid is placed on the secondary coil the free space (isotropic capacity)
is reduced about 20%. However, if there is more than one toroid you will
need to use the E-Tesla6 program.

Varying the pri cap or sec term will change the number of pri turns needed.

Varying the pri avg rad will change the inside rad of the spiral.
Varying the width of turns will change the c/c spacing of the spiral. The
program is setup to give you the pri to sec clearance which is what is
normally desired.

The program was developed to give the maximum amount of information with the
minimum amount of inputs and be easy to use.

Let me know if you have other questions about JHCTES Ver 3.2

John Couture


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Wednesday, May 30, 2001 3:29 PM
To: tesla-at-pupman-dot-com
Subject: Tesla calculator frustration.

Original poster: "Bill Vanyo by way of Terry Fritz <twftesla-at-qwest-dot-net>"

This really should be quite simple, but no...

I just want to calculate where I *should* tap my primary, given the
Cap: 0.06uF
Primary: Inner diameter = 9.75", 1/2" spacing (center to center), 1/4"
Secondary: 1000 turns, 27.625" winding length, 6.625" diameter.
Topload: 8" chord, 23.5" center to center (capacitance = 34.845?)

Previously (with a smaller topload), I managed (or so I thought) to do
the calculation using JHCTES version 3.2, at

but now I can't see how I ever did it.  The weird thing here is that
what I would logically like to specify as input parameters, like primary
interturn spacing, are output parameters.  I have to try to adjust the
input parameters to get output parameters that match my existing

I've also tried E-Tesla 5 and 6 - got significantly different results,
and don't quite see how to calculate my tap point anyway.

Are the specs I've listed sufficient for calculating the tap point?

Another question, about toroid topload shape:  I made mine from 8" dryer
duct and two 16" pizza pans, but the pizza pans are about 4" apart.
Should that be a problem?  Any idea how much that affects the toploads

	Thanks again,
	Bill V.