Re: strange vttc

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

Original poster: "Malcolm Watts" <m.j.watts-at-massey.ac.nz> 

On 30 Mar 2004, at 11:18, Tesla list wrote:

 > Original poster: "claude masetto" <claudmas-at-optusnet-dot-com.au>
 >
 > David and others,
 > The 255khz measurement was constant from when the coil was lighting a
 > flourescent tube and there were no streamers to when the sparks hit
 > the 24" mark. I did not apply full power to the system as the CRO was
 > close by and did not want to damage it. I have tried tuning the coil
 > with more or less capacitance in the tank circuit and best performance
 > is with the values i have now. It has a topload of a 6" x 1.25"
 > toroid.

Lighting a tube is very much like lighting a streamer - it adds a
significant power loss and capacitance to the output. I've done a
number of expts powering a small TC resonator from a low-Z signal
generator powering a coupled untuned primary. The moment you get a
tube close enough and it strikes, the resonant point changes markedly
and you can usefully retune the generator to achieve maximum tube
brightness.

Malcolm


 > Claude.
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Tuesday, March 30, 2004 9:42 AM
 > Subject: Re: strange vttc
 >
 >
 >  > Original poster: humanb-at-chaoticuniverse-dot-com
 >  >
 >  > Claude, interesting measurements. I bet what you are
 >  > seeing is the discharge adding to top C and thus
 >  > dropping your coils frequency. Assuming 255KHz reading
 >  > was at the 30" mark. Pretty impresive VTTC.
 >  >
 >  > Regards,
 >  >
 >  > David Trimmell
 >  >
 >  > On Mon, 29 Mar 2004 07:44:47 -0700, "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.
 >  >  >
 >  >  > Claude.
 >  >
 >  >
 >  >
 >
 >
 >