Re: Tuning by current mea

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 Te> From Esondrmn-at-aol-dot-com Wed Apr  5 16:16 MDT 1995
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 Te> Date: Wed, 5 Apr 1995 17:51:33 -0400
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 Te> scott-at-csustan.csustan.edu Subject: Re: Tuning by current mea
 MG> Ed, I don't know how many turns you have on your primary, or what your
 MG>level of pri/sec coupling is

 Te> Mark,  The primary is 14 turns.  It is wound on a plastic form at 30
 Te> degrees (saucer shaped).  The copper tubing is on 3/4" centers.  The
 Te> first turn has 1.5" clearance from the secondary.  The diameter at the
 Te> top is about 28.0" if I remember correctly.  I would think this should
 Te> provide tight coupling without overdoing it. 
 MG>I attach a 100K
 MG> ohm carbon resistor to the side of the toroid and then to end of the
 MG>resistor I attach a #30 wire of a length equal to the appoximate length
 MG>of the discharge, and run it out horizontally from the toroid and attach
 MG>it to a insulated support. In other words, the wire/ resistor act as the
 MG>discharge arc. Then I measure the frequency of the secondary coil with a
 MG>scope and generator. I then remove the secondary coil from the vicinity
 MG>of the primary and tune the primary circuit frequency to match that of
 MG>the secondary. It has never been off by more than about 1/4 turn on the
 MG>primary tap placement.

 Te> Mark,  Why do you remove the secondary coil in order to tune in the
 Te> primary? It would seem that you would want it there in case it's
 Te> presence affects the frequency of the primary - and I think it would
 Te> some.   
 MG> The secondary will absorb any energy in the primary so you can't see the
     primary circuit response on the scope, the secondary acts like a 
     notch filter. The primary impedence is so much lower than that of the
     secondary (more capacitance) that the frequency of the primary isn't
     affected by the secondary, but the secondary "notch or dip" at resonance
     covers up the primary circuits "peak at resonance" unless the coupling
     between the two coils is very light. A coupling coefficent of .15 means
     15% of the primary coil lines of flux are linking up with the secondary.

                                Mark Graalman 

 Te> Mark,  What is a pri/sec coupling of .15??

 Te> Ed Sonderman

... Alias, Mark the spark
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