Multi-gap Sync RSG's and quenching
From: Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Friday, May 08, 1998 1:34 AM
To: Tesla List
Subject: Re: Multi-gap Sync RSG's and quenching
Before you embark on any more gap building, try adjusting
your coupling. The racing sparks should stop when you hit a good
value of k.
> From: Gary Lau 07-May-1998 0849 [SMTP:lau-at-hdecad.ENET.dec-dot-com]
> Sent: Thursday, May 07, 1998 8:13 AM
> To: tesla-at-pupman-dot-com; futuret-at-aol-dot-com
> Cc: lau-at-hdecad.ENET.dec-dot-com
> Subject: Multi-gap Sync RSG's and quenching
> To John Freau (and anyone else w/ $.02 to share):
> After reviewing some of your posts in the archives, I have some questions
> as I embark upon improving my sync RSG.
> Briefly, my coil specs are:
> 15KV/60mA NST
> Secondary: 4.25" x 23.5" x #22AWG
> Primary: .25" dia Cu tubing, 15 degree conical, ~6.25" ID, tap #13
> .01 uF 100KV cap, FCI brand (surplus from Fair Radio Sales)
> Topload: 4.5" x 15.5" toroid plus 6" x 24" toroid on top
> Tank wiring: very short, using .04" x .50" copper strap.
> Fres = 212 KHz
> Measured k = .14, lowermost pri & sec turns are even with each other.
> Using a 10 x .03" gap RQ static gap w/ fan, performance was 42" sparks.
> I made a 120 BPS sync rotary gap using a motor modified to 1800 RPM and a
> 9" G10 disk with 4 rotating electrodes, 8-32 x 1.25" brass screws
> perpendicular to the disk (all connected together), and two stationary
> electrodes. The stationary electrodes arc to the rotating screw
> electrodes on a .50" long segment of the screw's length. The coil's
> performance with the RSG fell to about 30" sparks, and the sparks in the
> RSG appear to drag about 1/2" from each gap, I assume due to poor
> quenching. I also tried putting a 5 x .03" RQ static gap w/ fan in
> series with the RSG, but no significant difference was seen. Also, just
> with the RSG, I sometimes get sparks racing along the secondary.