Re: [TCML] Eager to learn: Tuning - Debugging of built Coil System

["DC Cox" <resonance@xxxxxxxxxxxx>]

The JAVATC does the design, and is accurate as is.

I do initial resonance tuning at 40% power with a variac.

Then, I experiment with sec coil elevation to see what effect coeff. of
coupling has on performance.  I usually see max performance with slightly
looser coupling than JAVATC indicates is optimum, ie, I get longer sparks.
I usually set k values for 0.10 to 0.14 with 0.12 usually being optimum for
most my coil setups.  I use the "heater element" method of checking the
coupling, usually putting the heating element in a bucket of water.  I set
current with a variac for 10 Amps and then check sec output milliVolts to do
calculations.  This is posted in the archives.

also, it is very important to use a large dia sec coil even for NST systems,
e.g., 6 to 10 inch dia sec coils.  The voltage goes up as a function of L x
dI/dt and L is determined by square of the coil's radius, so larger is
always better.  It also goes up as a function of turns, but more turns
equals more resistance and Q drops.  I usually go for 1200 to 1400 maximum.
Someone else once posted doing experiments and he found 1,000 turns
optimum.  I usually shoot for 1200 to 1400 with a small coil and 1,000 even
with a large coil, e.g., 18 to 32 inch dia secondaries.

Many happy sparks,

Dr. Resonance




On Wed, Jul 2, 2008 at 2:19 PM, Fritz W. Egli <fritz@xxxxxxxxxxxxxx> wrote:

> Hello Doc Resonance,
> Jes, I use JavaTC! Conc. this programm, I want to learn to be able to
> judge,
> to evaluate if calculation results are ok, or if some parameters should be
> changed to obtain a better overall setup. Good particular answers alredy
> recived from Bart, wating for confirmation, if I did understand so far
> correctly.
> The other issue, a tuning guide to be used when the (JavaTC designed) coil
> is first time fired, I consider as very important, after my first
> experiances, where I tryed without a concept forward and backward ...  Now
> I
> have with help of Kurt Schraner a very detailed and very clear
> tuning-debugging guide. In my language. German.
>
> If such a tutorial exists in English, I am interested, also as I knew that
> "several roads leed to Rome"
> and that experts have also differente opinions in particular subjects .-
>
> Regards, Fritz
>
>
>
> : Re: [TCML] Eager to learn: Tuning - Debugging of built Coil System
>
> The best start towards this goal is to use JAVATC for the initial design.
> This will give you a solid start that works.
>
> Dr. Resonance
>
>
>
>
> On Wed, Jul 2, 2008 at 3:22 AM, Fritz W. Egli <fritz@xxxxxxxxxxxxxx>
> wrote:
>
> > Dear All,
> >
> > Has somebody a written, detailled  „TUNING – DEBUGGING GUIDANCE"
> > for a existing, built TC coil system, to be fired up first time,
> > that can help a newbie to work strictly, structured toward perfection -?
> >
> > With the help of a Swiss expert – a good friend, we coud establish such a
> > guidance in German language.
> > If same exists in English, I woud like very much to crosschek, to learn
> of
> > possible differente philosophies, differente expert opinions.
> >
> > Kind regards,
> > Mit freundlichen Grüssen,
> > Fritz W.Egli
> >
> >
> >
>
>
>
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