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RE: DESIGN QUESTIONS

 * Carbons Sent to: Esondrmn-at-aol-dot-com


 > From: Esondrmn-at-aol-dot-com
 > Subject: Re: DESIGN QUESTIONS

 
 RQ> Never use points for spark gap.

 ES> Ok, I will build two cylinder spark gaps and run them in series.

Or even better if you build two of these gap units, is series/parallel.
 
 RQ> For every bushing connected to a coil circuit you should place a 
 RQ> ferrite core RF choke in series.

 ES> I understand this is necessary to save the transformer (I lost 
 ES> one on my first coil).  Do you have any design details or con-
 ES> struction ideas on these? I have not seen any yet.

Get a nice big ferrite toriod. By big I mean two or three inches in
diameter. I wind about a dozen turns of #12 insulated wire on the core.

 ES> How much space between the contacts and the center ground is
 ES> recommended for a 12kv transformer on the safety gap?  About 
 ES> one half inch? 

Sounds good to me. You can get really precise for your particular
safety gap by setting the gap up without a tank circuit. Bring the
xfmr up to full voltage, and if the gap fires reliably open the gap
up a bit. If the gap fails to fire, then close it a bit. When the
gap fires 50% of the time in full voltage static testing (with no
tank circuit) then it is set perfect for low power tuning.

You want some activity in a safety gap. When the coil is in tune
and operating a full power, the safety gap should be adjusted to
fire gently, or show visible corona, about once a minute or so.

Richard Quick
... If all else fails... Throw another megavolt across it!
___ Blue Wave/QWK v2.12