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RE: rotary gaps and neons
Original poster: "Ted Rosenberg by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Ted.Rosenberg-at-radioshack-dot-com>
Until recently, there were two basic types of spark gaps: static and sync.
There are different styles of each. But basically the gap and the matching
tank cap have a great deal to do with how well your coil works and its
For example, my first coil used a static gap and a 15/60 NST. No moving
parts. 9 copper sweat couplings with .028" between. The spark from the NST
jumped from tube to tube. the tank cap was almost "resonant" which is .01µF.
Actually it was .0117µF. I got 24-30" sparks.
But now I use Marc Metlicka's Triggered Gap. It is far superior to any
rotary sync gap (IMHO) and it works best with a Larger than resonant cap. So
I now use a .028µF MMC. I now get 36-40" sparks with the same NST.
I will be publishing details on this new gap next week.
In the meantime, run some numbers using the various calculators such as Bart
Andersons JAVA Script (Terry has all the URLs)
Then plan what you will do before you go out and buy.
And remember, all us coilers are here to help you in your efforts.
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Wednesday, October 03, 2001 9:13 AM
Subject: Re: rotary gaps and neons
Original poster: "ROBERT L BOZARTH JR. by way of Terry Fritz
So, what is a "sync gap"? I'm about in the same stage in coil building.
Well... Ok. I'm just collecting stuff right now. Matter-O-fact, I'm going to
go pick up my first NST in an hour. So, I could use advice on how not to