Re: Tesla Coil Electrical Fields - was Dangers of running 2 coils...

To: tesla-at-pupman-dot-com
Subject: Re: Tesla Coil Electrical Fields - was Dangers of running 2 coils...
From: Bert Hickman <bert.hickman-at-aquila-dot-com> (by way of Terry Fritz <twf-at-verinet-dot-com>)
Date: Tue, 02 Mar 1999 17:10:22 -0700
Approved: twf-at-verinet-dot-com

Tesla List wrote:
> 
> Original Poster: "Basura, Brian" <brian.basura-at-unistudios-dot-com>
> 
> John,
> 
> I looked at the pictures and the coils were about 14' apart.  I was running
> about 2kva at that time if I remember correctly (we made many changes that
> evening) and was having some trouble getting breakout with the topload
> configuration at the time. Don't know if it makes any difference but we were
> both sharing a common ground wire (Ground rod with a 10' lead to my coil
> then 10' more to Ross's coil).

This makes a BIG difference - the ground wire really isn't truly at
ground potential on a running coil because of the inductance in the
ground line and the series resistance of the wire and grounding
resistance to Earth. You basically created a base-excited resonator in
the passive coil. The greatest energy transfer will occur if the natural
loaded frequencies of the two resonators are the same, but because the
groundwire has impulse spikes, you will see effects at any combination
of frequencies. 

> 
> We did run the coils at the same time and had a blast...  I took some
> pictures but between messing with coils, worrying about safety, and setting
> up the other camera, I didn't notice the aperture setting got bumped and
> ended up with so-so pictures when they were running together.  I'll try and
> post them to my Web site this week.
> 
> Regards,
> Brian D. Basura
> 

<SNIP>