Re: Base current......Re: Tesla Coil RF Transmitter

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Dan" <DUllfig@xxxxxxxxxxxxx>

I am going to cautiously disagree with what you are saying. I have 
looked over the websites you pointed me to, and I see a couple of issues.

1 -- The tssp website says that it is trying to model real life coils 
in software, and trying to predict them as close as possible. 
Somewhere in there it says the inductance of a resonant coil cannot 
be predicted by lumped element formulas, as the current is not 
uniform along the coil

2 -- The GeoTC library clearly states that it calculates the 
inductance from Grover's tables. I have looked at the actual source 
code, and this is indeed the case. Inductance calculations are done 
by sepparating a coil into individual turns, and then looking up the 
inductance in grover's tables for that turn. As stated elsewhere, 
inductance of a resonant coil cannot be predicted on the basis of tables.

3 -- GeoTC does not seem to be a full implementation of tssp, rather 
a library built on some of the concepts of tssp (their words, not 
mine); therefore, just because tssp may be accurate, does not mean 
GeoTC is accurate. As a matter of fact, since GeoTC calculates top 
load capacitance, and coil inductance, and derives resonant frequency 
from that, it seems it is indeed considering the TC as a lumped 
element circuit, which was disproven by J. & K. Corum.

4 -- one final note: without any sparks comming out the top load, how 
can the current be uniform? for a current to exist, there has to be, 
excuse me for repeating myself, an actual CURRENT! since the top load 
only sees a voltage potential, there can be no current at the top. If 
your software is telling you that the current is evenly distributed, 
there is something wrong with the software...


Dan


----- Original Message -----
From: <mailto:tesla@xxxxxxxxxx>Tesla list
To: <mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx
Sent: Wednesday, September 14, 2005 7:34 PM
Subject: Re: Base current......Re: Tesla Coil RF Transmitter

Original poster: "Dmitry (father dest)" 
<<mailto:dest@xxxxxxxxxxx>dest@xxxxxxxxxxx>

Hello Dan.

 > Original poster: "Dan" 
<<mailto:DUllfig@xxxxxxxxxxxxx>DUllfig@xxxxxxxxxxxxx>

 > well, let me tell you: if you read Tesla's deposition when he was
 > being sued by the Marconi corporation, Tesla clearly states that for
 > "power transmission" he would run his coil in undamped wave mode,
 > without streamers!

has i ever said that my values are for the case with a streamers
present? not at all.

 > PS.: by the way, are those figures calculated by software, or actual
 > measurements?

calculated by software, which is based on the measuring results of
many real coils :

<http://www.classictesla.com/fantc/fantc.html>http://www.classictesla.com/fantc/fantc.html

 > the figures could be the result of incorrect modeling
 > of the software, like if it was treating the circuit as a lumped
 > element circuit, instead of a resonant one.

impossible. read this first:
<http://www.abelian.demon.co.uk/tssp/pn1710/>http://www.abelian.demon.co.uk/tssp/pn1710/

"Examples of voltage and current distribution profiles for Tesla
secondary coils.

Example 8: Typical coil with toroid

The transimpedance is 43K ohms, much higher than the 29K predicted by
a cosine current profile, and almost equal to the _uniform current_
value of 45K ohms."

you may read this if you would be interested in future:
<http://www.abelian.demon.co.uk/tssp/>http://www.abelian.demon.co.uk/tssp/

:-D

btw - here are charts for my coil:

<http://cis.ru/~dest/bare.GIF>http://cis.ru/~dest/bare.GIF
http://cis.ru/~dest/toroid.GIF

i think that "peaks" are present only at inefficient coil, with a
funny small toroid, or even without one :-)))