Re: ideas to drop resonant freq?

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

Original poster: "Laurence Davis by way of Terry Fritz <twftesla-at-qwest-dot-net>" <meknar-at-hotmail-dot-com>

i agree that adding a larger top load should lower the resonance.  However, 
once the tap gets near the outermost limit of turn 5, the output sparks drop 
off.  perhaps, a new secondary with more turns...
AND get rid of the 12gauge solid wire I'm using.  its getting warm.
so i would guess too much current for the 12gauge wire.  wonder if home 
depot has reels of 8 gauge insulated. if not, PE tubing is like 2 bucks for 
25ft.  I know they have 8awg bare.  got 940 turns of 22awg on secondary now. 
going to 1100 or so and build larger cap.  I hate cutting plastic sheets.  
wonder if black PE film is okay for a cap. got 1000sq ft of it.

larry d.


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: ideas to drop resonant freq?
>Date: Mon, 22 Jul 2002 21:10:01 -0600
>
>Original poster: "cd by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><vbprg1-at-hotmail-dot-com>
>
>I am new to all  this (once again probably not the best person to ask)
>correct me if I am wrong...
>but I think increaseing top load will decrease frequency.
>I read somewhere that the top load or torus counts as extra wire added to
>the secondary.
>So therefore if you add a larger topload you can drop the resonant
>frequency. Just like you had built a larger or taller secondary coil.
>I do know for a fact that a larger top load will mean you have to tap
>further out on the primary to achieve resonance. Which is what I think you
>are trying to acomplish.
>Maybe Just build another torus and stack them...or get a big ball, A sphere
>has the most surface area, and therefor the most capacitance. The more
>capacitance the more added wire effect.....
>
>Hope that helps
>Chris Dowdy
>
>
>----- Original Message -----
>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: <tesla-at-pupman-dot-com>
>Sent: Monday, July 22, 2002 7:03 PM
>Subject: ideas to drop resonant freq?
>
>
> > Original poster: "Laurence Davis by way of Terry Fritz
><twftesla-at-qwest-dot-net>" <meknar-at-hotmail-dot-com>
> >
> > I've tried various things to drop the resonance on my coil. its tapped 
>at
> > between the 4th and 5th turn. its using a about 2500w with 4 12kv/30ma
>NSTs.
> > I've learned a few things in the process, but haven't dropped the freq
>yet.
> >
> > heres a list of what I've tried. I'm looking for suggestions on what to
>try
> > or what to test.
> >
> > 1) tried wrapping a new secondary. but miscalculated, and have fewer 
>turns
> > than first secondary (which will raise resonance, right?).
> >
> > 2) removed 300ft spool of RG6/u that was being used to connect to my
>ground
> > rods.  essentially an air core inductor.
> >
> > 3) removed 1 or 2 NSTs to better match resonant cap needed. here's my
>logic
> > on that.  java tesla calc says resonant cap for 12kv/120ma is 26nf or 
>so.
> > which my cap is within 5pct or so.  supposing that cap value needed is
>more
> > than what i have, then reducing number of NSTs will reduce the cap reqd.
> > therefore will lower resonance. it didn't.
> >
> > 4) learned that there are "diminishing returns" from increasing the 
>spark
> > gap distance. Also interrelated was the top load required changes per 
>the
> > spark gap dist.  meaning: the spark length maximum is not at a wide open
> > spark gap. (does this sound accurate?) this I would guess affects 
>charging
> > time of the cap.  in essence, there is an "optimum" spark gap maximum
> > distance with regard to spark output(which could be read as spark 
>length,
> > more or less branches, decibel level, etc)
> >
> > 5) next tries will include a smaller dia secondary with less turns, and 
>a
>4"
> > secondary with more turns. significantly. perhaps 30-50% more.  and a
>larger
> > cap that is adjustable AND in a smaller box.  i'll aim for 40nf with 5nf
> > steps, and break the last 5nf into 5x1nf.
> >
> > experimentation helps me see the truth behind the math.  I wish i had a
> > stronger grasp of the fundamentals behind it all.  with time it will 
>come.
> > thanks for any comments.
> >
> > Larry.
> >




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