RE: Calculating E-Field of SSTC or Tesla Coil

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

Original poster: "Peter Lawrence by way of Terry Fritz <teslalist-at-qwest-dot-net>" <Peter.Lawrence-at-Sun.COM>

John,
      last weekend I finally got a way to directly measure the resonant F of
one of my secondaries, I got 204.8 KHz.  ETesla6 predicted 204 KHz.  Thats
less than 1% error.  Nothing else comes that close.  ETesla6 is the method by
which everything else can be guaged.  As to the question about the use of
Wheeler and Medhurst, of course they should be used, you don't need the
accuracy of ETesla6 to get a TC to work, just adjust the primary tap until
it works, for that Wheeler and Medhurst+80%Toroid work just fine to get you
into the ball park.

-Pete Lawrence.


 >
 >Original poster: "John H. Couture by way of Terry Fritz 
<teslalist-at-qwest-dot-net>"
<couturejh-at-mgte-dot-com>
 >
 >
 >Terry -
 >
 >There appears to be no way to check E-Tesla6 with the TSSP graph and the
 >Wheeler and Medhurst equations. This means that this graph and these
 >equations should not be used for Tesla coils?
 >
 >John Couture
 >
 >---------------------------
 >
 >
 >-----Original Message-----
 >From: Tesla list [mailto:tesla-at-pupman-dot-com]
 >Sent: Friday, July 25, 2003 9:56 PM
 >To: tesla-at-pupman-dot-com
 >Subject: RE: Calculating E-Field of SSTC or Tesla Coil
 >
 >
 >Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>
 >
 >Hi John,
 >
 >If the room is 300 inches high and the coil is 200 inches high...  C top
 >will increase just as good ol' E-Tesla predicts ;-))  It's that C is
 >proportional to 1/d thing...
 >
 >What is this "No surroundings effect" stuff!!!   With the ceiling only 1/2
 >of the secondary height away, "surrounding effects" will be dramatic!!!!
 >
 >I am concerned the E-Tesla and TSSP seem to disagree since TSSP uses much
 >of the same theory as E-Tesla.  It is possible the E-Tesla was confused by
 >such a close ceiling but it should have reported the usual warnings.  I
 >would need the full "output.txt" file to really know what is going
 >on...  E-Tesla is very good at "tight places" stuff...
 >
 >Can you tell me the actual input data to E-Tesla and I can easily check it
 >all out.  E-Tesla creates a diagnostic file that can easily plot all the
 >fields and where it is "thinking"...  Bobo's are pretty apparent then...
 >
 >Cheers,
 >
 >          Terry
 >
 >
 >
 >
 >At 09:34 PM 7/25/2003 -0400, you wrote:
 >
 > >Terry -
 > >
 > >There appears to be a problem with E-Tesla6. The program is showing an
 > >incorrect Fres when compared to TSSP and JHCTES. This is due to the Cpf
 > >being too large.
 > >
 > >Bare secondary coil is isolated in center of room
 > >Ceiling and walls 300"
 > >Pri and sec windings at 200"
 > >No surroundings effect
 > >
 > >                     TSSP     JHCTES       E-Tesla6
 > >
 > >Fres KHz  about     150      149.71        139.91
 > >
 > >C pf                ---       13.30         16.38
 > >
 > >Sec Ind mh          ---       84.97         84.97
 > >
 > >When the capacitance effects of the surroundings are taken into
 > >consideration (ceiling and walls = 100) the C pf should decrease and the
 > >Fres should increase???
 > >
 > >John Couture
 > >
 > >--------------------------------
 > >
 > >
 > >-----Original Message-----
 > >From: Tesla list [mailto:tesla-at-pupman-dot-com]
 > >Sent: Friday, July 25, 2003 3:57 PM
 > >To: tesla-at-pupman-dot-com
 > >Subject: Re: Calculating E-Field of SSTC or Tesla Coil
 > >
 > >
 > >Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>
 > >
 > >Hi Dan,
 > >
 > >E-Tesla6 can calculate x/y arrays of numbers that can be imported into
 > >Excel or MathCad.  See the readme file and the other site:
 > >
 > >http://hot-streamer-dot-com/TeslaCoils/Programs/E-Tesla6.zip
 > >
 > >http://hot-streamer-dot-com/andrewb/models/models.htm
 > >
 > >The program is really to find Fo, but we have had great fun with the data
 > >that can be plotted from the array work files.
 > >
 > >Cheers,
 > >
 > >          Terry
 > >
 > >
 > >
 > >At 03:25 PM 7/25/2003 -0400, you wrote:
 > >
 > > >Anyone have any information on how to calculate the E-field
 > > >(approximately) of a tesla coil.
 > > >I saw an old post that stated Terry had an E-Field calculator program,
 > > >but i didn't see one on the
 > > >hot-streamer site.
 > > >
 > > >Any help appreciated.
 > > >Thanks
 > > >
 > > >Dan
 >
 >