Re: Fwd: Re: Calculating streamer breakout of top-loads

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

Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>

Hi Gerry and Ed,

The complex streamer impedance looks like this:

http://hot-streamer-dot-com/TeslaCoils/MyPapers/smallar/Image155.jpg

:-))))  This is sort of a "young science".  "I" never really revisited this 
matter and the equipment needed to do such testing was "rare".  So, no one 
else has ever looked at it either...  But now-a-days (five plus years 
latter..), perhaps others can also study such things as:

http://hot-streamer-dot-com/TeslaCoils/MyPapers/smallar/smallar4.html

The early wild simplifications like 220K +1pF/foot no longer seem to keep 
everyone satisfied :oD  Looks like you are all figuring out that there is 
more to it ;-))

Cheers,

         Terry


At 10:41 PM 9/12/2003 -0600, you wrote:
>I wondered this myself,  If you have a source with say a fixed source
>impedance and you vary the load impedance, then the maximum power transfer
>is with the Zload = Zs.  However, if the load impedance is fixed and the
>source impedance is varied, then the maximum power transfered is with Zs = 0
>to get maximum voltage on the load.
>
>I'm wondering in this case, if the coil impedance is dependent on its
>inductance and Fres and to get a low impedance coil means to either reduce
>the number of turns on the secondary or to lower the resonant frequency.
>The former may be counterproductive.  The latter could mean a larger top
>load and too could be counterproductive beyond a point.  I believe Terry
>modeled each streamer as a 220K resister feeding a capacitance of 1 pf per
>foot of streamer.  He had the entire system in the model (ideal sparkgap, TC
>primary and secondary modeled as a transformer with primary inductance,
>secondary inductance, coupling coefficient k, top load capacitance combined
>with the Cself of the coil and varied the output impedance to maximize the
>power to the streamer.  See his web page for details.  He effectively
>thevenized the coil to determine the output impedance.
>
>His streamer model is based on some experimental work that he is better able
>to describe.
>
>Gerry R.
>Ft. Collins, CO
>
> > I too have wondered about "impedance matching".  Before streamers form
> > the secondary Q is relatively high, but once they are there they form a
> > very nonlinear complex impedance which would be hard to match.  On the
> > other hand, I do believe that a low-Z secondary will be able to deliver
> > more power than a higher impedance one.
> >
> > Ed
> >
> >