Re: HELP!!! PRIMARY

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

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-uswest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi Will, John C.,

I just checked your coil with John C's program JHCTES v3.2 and using Johns
style of inputs:

Primary:
Average radius: 4.36
Coil Height: 0
Width of Turns: 3.73
It tuned in at 15.2 turns

Also, I've changed JavaTC to input edge to edge spacing vs. center to
center. I have not yet put in Wheeler
for "helical or vertical" coils yet. I'll probably upload this latest
version tonight. Anyway, JavaTC showed
15.6 turns. Something to note about our programs is the toroid capacitance.
Many programs have you input
this value and others (JavaTC for example) calculates it. In your case,
13.3pF. Note that when you actually
place the toroid on top of the coil, the capacitance value may drop some
with toroid height above the coil
and ground plane. Any drop in top load capacitance will increase the
secondary's resonant frequency. To make
up for this, the primary will need to be tapped in (less turns slightly).

So my personal view point is to wind about 17 turns and light it up. Find
the tap position from there and
report back once you get this puppy up and running.

Take care,
Bart A.


Tesla list wrote:

> Original poster: "Barton B. Anderson by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <tesla123-at-pacbell-dot-net>
>
> With these latest specs, I got about 15.1 turns on the primary. However, as
> John C. has
> mentioned, the c-c spacing needs to be corrected. Haven't done this yet.
> However, you will
> get slightly different answers for the tune point. I personally would make
> the primary about
> 2 turns over your largest value just incase.
>
> I'm hoping to get to the c-c spacing issue tonight.
>
> Take care,
> Bart A.
>
> Tesla list wrote:
>
> > Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> <HVhighvoltageHv-at-aol-dot-com>
> >
> > Hello everyone,
> >
> > I am about to wind my primary and i was wondering if i would have enough
> > turns to be able to tune the coil. The primary specs will be:
> >
> > 1/8 dia tubing
> > 25 spacing center to center
> > 14 turns
> > 5 inch id
> >
> > the coil specs are:
> >
> > secondary:
> > 11.5 inchs wound
> > 2.25 dia
> > 34 AWG wire
> > 1840 turns exactly
> >
> > capacitor:
> > MMC style
> > 40 of the geek group cap arranged for .01 at 40-50 kv
> >
> > Nst:
> > 15kv 60 ma
> >
> > main gap:
> > fully adjustable solid brass electrodes
> > 6 gaps total
> >
> > Toroid:
> > 12 inch dia
> > 3 inch cord
> >
> > Note: This will be for a bipolar unit, so there will be two
> > secondaries,primaries, and toroids with the exact same specification.I hope
> > someone will help me out. The main problem is, i get two different "tuned"
> > anwsers with two different programs.
> >
> > With tesla java designer:
> >
> > I am told that i should have:
> >
> > 14.4 turns
> >
> > With wintesla 3.0 i am told that i should have about:
> >
> > 12 turns
> >
> > I was planning on having 14 turns, with 2 extra turns to tune. I was just
> > wondering what others thought.
> >
> > ALSO, if anyone has wintesla 4.0 please send it my way, or if you know how
> > i can contact the author, tell me. I have tried to contact him multiple
> > times, biut have recieved no response.