Primary Help

To: "'Tesla List'" <tesla-at-pupman-dot-com>
Subject: Primary Help
From: Tesla List <tesla-at-stic-dot-net>
Date: Wed, 3 Jun 1998 21:29:33 -0500
Approved: tesla-at-stic-dot-net

----------
From:  Esondrmn-at-aol-dot-com [SMTP:Esondrmn-at-aol-dot-com]
Sent:  Wednesday, June 03, 1998 11:10 AM
To:  tesla-at-pupman-dot-com
Subject:  Re: Primary Help

In a message dated 98-06-03 01:44:17 EDT, you write:

<< 
 I have a secondary that is 4" PVC and the coil is 18.5 inches long.  It is
 wound with 21 guage wire, enameled.
 The tank circuit is a 15Kv 30ma NST with a .0049 Mf bottle capacitor.
 It uses a RQ gap with 4 gaps.
 My terminal is a torus 4"X14"

 What type of primary would work with this?  I haave tried the following,

 1) 12 guage house wire 12 turns vert. 8 in. diameter, 8" sparks
 2) 1/4" copper tube flat spiral 7 turns from 5" to 16", no output
 3) 11 guage enameled flat spiral 24 turns 5" to 16", no output

 I need a lot of help in this area, Please help.   M. Andrus

  >>

M.,

I calculate your secondary to be 7.0 mh (if winding length is 18.5").  Self
resonant frequency should be 679 khz with no toroid and about 399 khz with
your 4" x 14" toroid.  A flat primary made of .25" dia copper tubing with .25"
spacing with an inside diameter of 6.0" should tune with your system at about
10.25 turns.

Maybe you haven't got it in tune yet - or the transformer is weak - or there
is some problem with your capacitor?

Ed Sonderman