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Re: Question regarding synchronous gap driven coils

Tesla List wrote:
> 
> Subscriber: sgreiner-at-mail.wwnet-dot-com Thu Jan 30 22:23:48 1997
> Date: Thu, 30 Jan 1997 13:48:42 -0800
> From: Skip Greiner <sgreiner-at-mail.wwnet-dot-com>
> To: tesla list <tesla-at-pupman-dot-com>
> Subject: Question regarding synchronous gap driven coils
> 
> Hi everyone
> 
> I address this post mostly to those of you who run synchronous rotary
> gaps but will certainly appreciate responses from anyone.
> 
> Here is a quick description of my latest creation although the question
> also applies to my previous smaller TCs.
> 
> Secondary:240 turns #14 ga wire on a 14" x 30" skeleton acrylic frame
> 
> Primary:6 turns 3/8" copper tubing spaced 3/8" apart solenoid wound on
> 18" diameter acrylic skeleton frame tapped at 5 turns
> 
> Neon:15kv -at- 120ma
> 
> Toroid:8" x 18" mounted 2" above top turn of secondary
> 
> Primary top turn is even with lowest turn of sec giving k=.25(about)
> 
> Rotary synchronous break -at- 1800rpm giving 1 break per half cycle of the
> mains at about peak of the sine wave
> 
> Discharge length over 60" point to point limited by room dimensions
> 
> Although the discharges maximize at the fifth turn tap, a variation of
> +/- 1/2 turn has very little effect on the discharge length although
> changing to the sixth of fourth turn has more effect. The connecting
> wires between the gap, cap and primary are from 6" to 12" max.
> 
> In reading various posts it appears that those of you running static
> gaps and non-synchronous gaps obtain very definite peaking when tuning
> the primary. My question is: do those running synchronous gaps see the
> same sharp tuning or do you see the much broader peaks which I
> encounter. Also is it possible that the broader tuning is due to the
> fairly large diameter primaries and secondaries which I use or is it due
> to the synchronous gap.
> 
> Skip


Skip -

  Probably due to the relatively high inductance of your primary. On
my large coil system (3600-RPM sync gap), if I am off by even 1/4 turn, 
it's really noticeable.

- Brent