Re: Coil design questions.

• To: tesla-at-pupman-dot-com
• Subject: Re: Coil design questions.
• From: Esondrmn-at-aol-dot-com (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Mon, 07 Dec 1998 19:46:33 -0700
• Approved: twf-at-verinet-dot-com

In a message dated 12/4/98 2:44:40 PM Pacific Standard Time, tesla-at-pupman-dot-com
writes:

<< 
 Greetings:
 
 A basic question for you seasoned coilers:  why is a the flat spiral primary,
 and lower coupling coefficient, better than a vertical helix or inverted
 cone??  Seems sort of counter-intuitive . . . don't you want to maximize
 coupling?  thanks.
 Larry
  >>

Larry,

Having built both types, the primary reason is that you can achieve
overcoupling with both.  This being the case, the saucer shaped primaries
provide no advantage.  If you adjust the coupling by finding out how much is
too much, then backing off a bit, you will find you can get either type too
tight.  The flat primary is also easier to build and allows more distance from
the toroid to help prevent strikes down into the primary.

Ed Sonderman

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