Re: SRSG machineing

[Terry Fritz <twftesla-at-uswest-dot-net>]

Hi Bill,

	I may have started a misunderstanding :-(  When "i" said a single rotary
gap could be used on two coils in "sync", I did not mean that the
electrical firing wave forms would be perfectly the same.  Just that you
could use a single four pole rotary gap to fire two "separate" primary
systems.  To "really" be electrically in sync, the primaries would have to
be in the "same" circuit split to two coils.

If two coils at 200kHz and 210kHz were fired, how may "beats" would they
have in the wave form?  10000 per second.  But remember the firing may only
last 10 cycles or 1/20000 of a second.  That is only 1/2 cycle.  Not good,
but not terrible either...

It may not be a big deal to "fiddle" with the gap so that they would fire
at almost exactly the same time.  Just a little capacitance in the right
place and all four gaps will go at once...

Many possibilities...

Cheers,

	Terry


At 10:04 AM 8/6/00 -0600, you wrote:
>On that fateful day 8/4/00 6:41 PM, thus spake Tesla list:
>
>> Original poster: FutureT-at-aol-dot-com
>> 
>> In a message dated 8/4/00 11:45:13 AM Pacific Daylight Time,
tesla-at-pupman-dot-com
>> writes:
>> 
>>> Could a twin-coil setup have seperate gaps perfectly synced to each other?
>>> (Smpte for a Tesla Coil :)....cool)
>>> 
>> 
>> Chris,
>> 
>> 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)
>
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