RE: RF phase of twin coils, was SRSG machining

["Basura, Brian" <brian.basura-at-unistudios-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

John,

You are absolutely correct. When 180-degrees out of phase the arcs attract
and when in phase there are no arcs between the towers (they are sort of
repelled from each other). This behavior is very consistent and reproducible
on bipolar systems such as my Mini-Twin. For more information on the
Mini-Twin check out http://fp2.hughes-dot-net/brianb/newpage12.htm

Brian B.  

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Wednesday, August 09, 2000 11:11 AM
To: tesla-at-pupman-dot-com
Subject: Re: RF phase of twin coils, was SRSG machineing


Original poster: FutureT-at-aol-dot-com 

In a message dated 8/6/00 2:57:04 PM Pacific Daylight Time, tesla-at-pupman-dot-com

writes:

Bill,

You make a good point there.  I thought I remembered some folks
doing tests that showed the sparks attracting when out of phase,
and not attracting when in phase, but I may be mistaken in my
memory of this.  Maybe some folks who have twin coils will step
forth and recount their experiences with "in phase" vs "out of phase"
testing?  I've never built a twin or run two separate coils with sparks
hitting each other.

I do remember that Duane Bylund did some in phase vs. out of
phase comparisons with his solid state coils, and a very strong
difference was noted.  When in phase, the sparks repelled each
other, and attracted when in phase.  I believe he also used 6
different phases in six different coils, and had the arcs meet
in the center, etc.  I don't remember all the details though.  I'm not
sure if this was the RF phase that he was altering.  In any case he
shows this work on one of Richard Hull's videotapes.

Cheers,
John Freau

> > 
>  > Two separate sync gaps cannot be synced perfectly RF phase-wise.
>  > For a twin, it is usually desired that the sparks "attract" each other
>  > due to proper RF phasing.
>   
>   This is something I've had doubts about since I first read about it.  In
>  order for two coils to maintain an out of phase condition (resulting in
the
>  maximum voltage between the two discharge terminals) they would have to
be
>  operating at _EXACTLY_ the same frequency, with no drift whatsoever.
>  
>   If one coil is operating at 212.570 kHz, and the other coil is operating

at
>  212.580 kHz, they will be constantly drifting in and out of phase with
each
>  other ten times times a second.  More to the point, they will only be out

of
>  phase with each other about 10% of the time!
>  
>   Any time the two coils are not perfectly out of phase with each other, 
they
>  are going to behave like two random coils of different frequencies that 
just
>  happen to be sitting next to each other, and happen to look alike.
>  
>   Now I am perfectly willing to accept that two coils can be tuned to
>  approximately the same frequency, ie; 212 kHz +/- a few kHz.  But it
>  stretches the limits of believability that two coils could not only be 
tuned
>  within less than one Hz of each other, but maintained there constantly.
>  
>   Would someone kindly point out any flaws in my reasoning?
>  
>   Incidentally, I have run two "identical" 12kW coils, with totally
separate
>  primary systems, making no attempt to tune them to each other, and saw
>  streamers that frequently met in the middle, and more rarely, solid
"power
>  arcs" (please don't ask for another definition, JC) between the two 
toroids.
>  
>  - Gomez (Bill Lemieux)
>