Re: strange vttc

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

Original poster: "Jim Mitchell" <electrontube-at-sbcglobal-dot-net> 

I don't think this is all that strange.  For one,  with a VTTC,  it is not a
self resonant system.  So the VTTC will be running at the frequency of the
tank LC circuit,  which may not be the EXACT resonance of the secondary.
Therefore, you reading a different frequency output on your scope is
probably due to the coil not being in exact resonance.  Just like on an
oscillator driven SSTC, you have to retune sometimes when the output grows
because of it's capacitance.

Regards - Jim Mitchell

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, March 29, 2004 6:42 PM
Subject: Re: strange vttc


 > Original poster: Mike Poulton <mpoulton-at-mtptech-dot-com>
 >
 > Tesla list Wrote:
 >  > Original poster: "claude masetto" <claudmas-at-optusnet-dot-com.au>
 >
 >  > Hello all,
 >  > I have been playing around with my vttc and have been taking some
 >  > observations with my scope and have noticed something strange. The res
 >  > frequency of the resonator as calculated by Java TC is 342khz. When I
 >  > measured it with a signal generator and a scope the result was 360khz.
Close
 >  > enough for me.
 >  > I then setup an antenna with a scope probe attached to it and measured
the
 >  > resonator frequency with the the coil running and noticed it was
255khz. The
 >  > coil is in tune, as best as I can get it because it performs great.
Twin
 >  > 304tl tubes with 30" spark on a good day.
 >  > I can't understand the difference in the two measurements. I have
checked
 >  > the results over and over.
 >
 > Is that the frequency when producing a 30" discharge? Does it increase
 > when you turn the power down until the discharge disappears? If so,
 > then the additional capacitance of the discharge is pulling the
 > frequency down (as expected). That is a very large change, though --
 > much more than I would have anticipated. Do you have a topload of any
 > kind on the secondary?
 > -------------------------------------------------
 > Mike Poulton
 > MTP Technologies
 > mpoulton-at-mtptech-dot-com
 > KC0LLX (70cm AM ATV, 33cm/12cm FM ATV, Omaha, NE)
 >
 >