# RE: The equation used to calculate the resonant frequency of a secondary coil

```Original poster: "John H. Couture" <couturejh-at-mgte-dot-com>

Note that spaced winding has negligible effect on the inductance or
capacitance of the TC calculations. The spaced winding is the same as more
insulation. All you need are the TPI or

TPI = Secondary turns/Inches of winding length.

To find the resonant frequency fast and no calc errors use the JHCTES Ver
3.42 program. For secondary inputs enter only the secondary radius, turns,
and TPI. Click "Calculate" at left bottom of page and you will get coil
inductance, coil self capacitance, resonant frequency, and some other useful
parameters.

Click on    www.mgte-dot-com

Click Tesla, then JHCTES (Books). At bottom of book page click on JHCTES Ver
3.42 computer program.

If you want a fabulous TC secret revealed to you about how to find the
secondary coil "inductance" by measuring only the "resistance" of the
winding send me a direct post. This secret is not available thru any other
web site or in any published text. Even Tesla never mentioned this
possibility in his writings.

John Couture

------------------------------

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Sunday, February 01, 2004 7:43 PM
To: tesla-at-pupman-dot-com
Subject: Re: The equation used to calculate the resonant frequency of a
secondary coil

Hi,

> Original poster: robert & june heidlebaugh <rheidlebaugh-at-desertgate-dot-com>
>
> Adam: You were given a formula. The problem is you dont know the self
> capacitance so tables based on experimentation is required, I use spaced
> wire so I can only wind a coil to approximat size and test the results,
The
> self capacitance of close wound coils dosen't apply. Use the prograns
> provided by the Tesla list for best results.
>       Robert   H
> --
>

Or use  1/ (4 sqrt ( LsCs)) were Ls and Cs  are the measured values and
valid for one end grounded. Similar accuracy as the table for Tesla coils.

Robert if your taking about the C to go with the L it is hardly effected by
space winding up to several wire diameters.

Bob

```