Re: Off-axis primary inductance

• To: tesla-at-pupman-dot-com
• Subject: Re: Off-axis primary inductance
• From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Wed, 25 Nov 1998 00:04:31 -0700
• Approved: terryf-at-verinet-dot-com

Hi Gary,

> Original Poster: Gary Lau  22-Nov-1998 1518 <lau-at-hdecad.ENET.dec-dot-com> 
> 
> >"I had heard the well circulated wive's tale that off axis L would waste
> >energy.  This test graphically proved that it does not.
> >
> >The practical conclusion is that it IS technically acceptable to place a
> >high quality air core tuning coil in series with the Tesla coil primary
> >coil in order to achieve 'fine tuning' without throwing away hard won RF
> >tank circuit energy!
> >
> >Real valuable knowledge gleaned by the actual doing.
> >
> >Robert W. Stephens
> 
> This sounds reasonable.  Now it makes me wonder about the importance of
> low ESL tank capacitors.  If it's okay to have inductance scattered
> anywhere throughout the tank circuit as long as one's coupling is not
> compromised and pri/sec resonance is maintained, why should ESL matter?
> Could it be that only dielectric, and DC plus skin-effect resistive losses
> matter in the tank?  Or is capacitor ESL correlated to resistive losses
> in the cap as well?
> 
> Gary Lau
> Waltham, MA USA

In a loose sense it is. High ESL => high ESR because of the length of 
the current path.

Malcolm

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