RE: A Little more than general questions II

["Tesla list" <tesla-at-pupman-dot-com>]

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


Wade -

The easiest way to determine what happens when the TC parameters are changed
is to use the  JHCTES Ver 3.2  on-line computer program. Click on

     http://home.att-dot-net/~couturejh/

When you change the radius and press "calculate" you will get an instant
answer to your questions. There are hundreds of other TC combinations
possible. The computer will do all the calculations to keep the TC system in
tune when you make changes. The computer will also give you an estimated
spark length based on power input, NST sec voltage, and secondary
inductance. Design the secondary first to determine the operating frequency.
The primary is then automatically tuned to this frequency. Don't forget to
select "spiral" or "coil". The spiral is for zero to 30 degrees. The JHCTES
Ver 3.1 program can be downloaded.

John Couture

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

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Friday, April 13, 2001 3:21 AM
To: tesla-at-pupman-dot-com
Subject: A Little more than general questions II


Original poster: "Wade B AndB Anderson by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <nabedaw-at-juno-dot-com>

Hi guys,

Again , Thanks for all the input on my last questions.

I'm wondering if one of you has a formula for calculating the
inductance??? The one I have requires that the permeability of the core
be included. And since this device has an air core............maybe the
permeability is  1???
  I am also working on another project that I requires me  to calculate
the inductance of my coils, but these coils have iron and steel cores,
and permeability information must be top secret or something, cause I've
been unable to locate it.
 Anyway, back to TC's
   I had previously asked how the diameter of the secondary affects the
operation,.......and I think Greg you mentioned that the operating
frequency will decrease with an increase in diameter??? Now the Tesla
coil is very dependent on the frequency being high??? Correct??? So,
increaseing the diameter will increase the "Q" point, which is a bad
thing, the lower the Q the closer to (theoretical) true resonance???
   I'm hung up on this diameter thing because I have a 6 ft piece of 12"
diameter PVC, and I'm debating to whether or not I'm going to build my
first coil with it, and it will be a dandy. Using #22awg -at- 1,000 turns
will take up about 2 1/2" feet. I'll probably save that piece of plastic
for a later coil.


  It seems that the spark gap needs to be adjustable while the coil is in
operation.

What are some SAFE methods of constructing an adjustable spark gap??? I
have some ideas, just looking for other input.

And also, what are some reliable materials that can be used at the spark
gaps terminals???  Brass??? Carbon??? Water??? Something that won't melt
down.

Thanks again,

Wade