Re: magnifiers

• To: tesla-at-pupman-dot-com
• Subject: Re: magnifiers
• From: lod-at-pacbell-dot-net
• Date: Tue, 07 Jan 1997 20:15:59 -0800
• Subscriber: lod-at-pacbell-dot-net Tue Jan 7 22:59:53 1997

Richard Hull wrote:

[snip]
> Critical coupling cannot be calculated unless you know the exact quench
> time of your gap system.  Very few of us ever know this figure when
> using air gaps. In general, it is a trial and error sort of thing done on
> the fly.  You can continue to couple up tighter and tighter as you note
> the spark output and especially the secondary coil.  If sparks start
> racing up and down the secondary, you are over coupled or have exceeded
> "critical coupling" for your gap system.
> 
> Richard Hull, TCBOR


Richard,
In the case of an over-coupled coil, why is it that sparks race up and down
the secondary?  It seems that if the sec was better insulated, then more
voltage is better.  I've never seen this effect with my coil, as the highest
coupling that I can get without massive rework is only 0.12.  I'd like to 
try to increase the coupling, as the 4-gap rotary usually quenches after the
first beat (~90uS duration) if the streamers are fully extended.

-GL

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