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Re: [TCML] spark models



Although most of this stuff is far beyond me I may have a solution to one of
your problems.

There is a cheap one channel battery powered O-scope called the DSO Nano.
It's bandwidth is a bit limited at 1MHz but at $100 what more can
you expect. hehe

http://www.sparkfun.com/products/10244

Something like this could display current from the top of the scope with a
current transformer.


I had one other idea, not sure how well this would work. The idea would be
to transmit the data from a USB O-scope using a frequency that is much
higher than the Tesla coils Fres and also not in one
of it's harmonics bands. I have see this effect wok very well before with
cell phones and a regular DRSSTC. If a radio could be found that transmits
at a higher frequency than the coil and also didn't transmit in a harmonic
this very well could work.

I also tested this effect with my Yaesu VX-7R Transceiver and my one of my
twin DRSSTC running at a fres of about 91KHz. As I scanned through the
frequencies from 300KHz to 800MHz there where distinctive pockets of noise
were you could here the BPS of the coil coming through. There were also
pockets of complete silence. I thing these pockets of silence can be taken
advantage of.

This topic intrigues me as well and I look foreword to see what you find.

Good Luck,
Eric

On Thu, May 26, 2011 at 8:45 AM, Steve Ward <steve.ward@xxxxxxxxx> wrote:

> Jim,
>
> I have great interest in this topic, but so far all I've managed to do is
> come up with more questions.  Some current questions are:
>
> 1) What impact does resonant frequency play?  I think this must relate to
> some basic principles about spark growth and basically the resonant
> frequency plays a role in how often the leader gets a new "kick" which i
> would suspect plays a big role (well, because my testing says so).  Id
> guess
> that there's probably an issue with displacement current through the
> streamer's capacitance, my guess would be that higher frequency could be
> more beneficial in that it would keep more current circulating through the
> spark channel and keep it hot.  I'd be curious to hear your thoughts.
>
> 2) What is the difference between spark growth behavior on a "transient"
> coil vs something like my quasi-CW system (which in my opinion is much
> easier to do studies on)?  Pics can be found at:
> http://www.flickr.com/photos/kickermagnet/
>
> It seems that any good streamer model would also factor in things that
> effect the conductivity of the air, that is, how long ago was it recently
> ionized or heated up, and how long does it take for the ions to recombine
> or
> for the temperature to come down.
>
> Im considering how i might be able to rig up a cheap(er) USB oscilloscope
> (or some other data acquisition) to the topload of the coil so that i can
> measure current between toroid and secondary, and current out of the
> breakout point.  Looked into USB-fiber optic converters, they are pricey...
> hoping i might be able to make my own if i can get fast enough fiber-optic
> parts.
>
> Any other suggestions on how you could measure these currents?  I seem to
> recall terry fritz had some fiber optic probes, but i was really not sure
> how that worked, and they also looked to be really expensive and probably
> finicky if i had to guess.  The direct approach would be nice, of course.
> Ive already considered crude options like a LED bar graph that would read
> back the peak current value, and of course tell me nothing about the
> wave-shape.  Could also make my own low quality data acq with some
> micro-controller or something, which honestly might be just as useful
> unless
> i have some other solution with really high bandwidth.
>
> Steve
>
> On Wed, May 18, 2011 at 7:08 PM, Jim Lux <jimlux@xxxxxxxxxxxxx> wrote:
>
> > I've written a short description and drawn a few diagrams of some
> > directions for future spark modeling.  Comments welcome.
> >
> > http://home.earthlink.net/~jimlux/hv/tcsparkmodel.htm
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> >
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