Re: How to rise the secondary? (fwd)

---------- Forwarded message ----------
Date: Wed, 15 Jul 1998 01:13:12 -0500
From: "Robert W. Stephens" <rwstephens-at-headwaters-dot-com>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: How to rise the secondary? (fwd)

> Date:          Wed, 15 Jul 1998 08:41:28 -0600 (MDT)
> To:            tesla-at-pupman-dot-com
> Subject:       Re: How to rise the secondary? (fwd)
> From:          Tesla List <tesla-at-pupman-dot-com>

> ---------- Forwarded message ----------
> Date: Tue, 14 Jul 1998 23:42:37 -0600
> From: terryf-at-verinet-dot-com
> To: Tesla List <tesla-at-pupman-dot-com>
> Subject: Re: How to rise the secondary? (fwd)
> At 10:18 PM 7/14/98 -0600, you wrote:
> >From: "Robert W. Stephens" <rwstephens-at-headwaters-dot-com>
> >To: Tesla List <tesla-at-pupman-dot-com>
> >Subject: Re: How to rise the secondary? (fwd)
> >
> SNIP>>>>>>>>>>>>>>>>>>>>>>>>.
> >
> >John,
> >
> >I hope you can be as suprised as I was when I made this physical test.
> Take an 
> >average TC that can produce a solid 8 foot discharge, even on holidays.  Take a
> >straight piece of copper wire, aluminum , steel or even a salty piss trail
> on an 
> >otherwise insulating rug  that equals the let's say 8 foot output spark length.
> >Electrically connect this conductor to your topload and suspend this piece of
> >straight outwardsbound conductor radially away from the topload of your coil
> >discharge terminal through the help of insulating nylon fishing line, or 
> >plastic barrels.  With an o-scope and signal generator measure the
> secondary Fo 
> >of the HV resonator before and after the introduction of this electrically
> isolated
> >streamer length wire representation model!
> >
> >Hint: If the software program you rely upon doesn't anticipate this 
> >experiment I suggest you test this effect in real hardware and find a 
> >way to include it's variability into your software.  It is rather 
> >significant!!!!
> >
> >I suggest that you will discover that a long streamer causes a great 
> >deal more than _insignificant_ tuning and loading effect upon a 
> >non-sparking Tesla coil.
> >
> >Richard Hull and many others of us with dirty hands now know this well from
> >the doing.
> >
> >Robert W. Stephens
> A very interesting post and idea!!!!  My models don't do this type of load
> effect but they probably should!  I hope it can be modeled as a lumped
> parameter :-))
>         Terry Fritz 
Terry, All,

This physical model could probably be made more accurate by breaking 
up the wire I suggest projecting from the topload by introducing 
carbon resistors at intervals along its length.  An actual streamer 
has a complex time varying impedance characteristic which certainly 
does not hover around a fraction of an ohm.  When I was inspired to 
try this experiment I just grabbed a stiff piece of 3/8th's inch aluminum 
hardline coax that was handy and draped it between the topload and a piece of 
PVC pipe at the far end.  I was really suprised to see my system Fo drop 
from mid 90's kHz about a full 10 kHz!

Robert W. Stephens
Lindsay Scientific Co.
RR1 Shelburne, ON Canada L0N-1S5
Tel or AutoFax: 1-519-925-1771    
*Custom built Tesla coils, etc., for museum display 
 and special effects work.
*Canada's largest publicly accessible wall-to-wall
 indoor lightning show...by appointment.
*Future home of Electric Science World, 
 educational/entertaining Theatre of Electricity.
*Antique TV Museum...in search and acquire mode now.
~~~~~~~~~~~~~ Inquiries welcomed! ~~~~~~~~~~~~~~~