Re: Not enough pimary inductance?

• To: tesla-at-pupman-dot-com
• Subject: Re: Not enough pimary inductance?
• From: Ed Phillips <evp-at-pacbell-dot-net> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Wed, 18 Nov 1998 21:55:36 -0700
• Approved: terryf-at-verinet-dot-com

Tesla List wrote:
> 
> Original Poster: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br>
> 
> Ed Sonderman wrote:
> 
> > If you are going to add a couple of loops somewhere, I would suggest
adding
> > them to the primary.  It is usually possible to add more outside turns.
> > Adding wire or loops anywhere else in the primary circuit would be off
axis,
> > very lossy and probably noisy RF wise - that power has to go somewhere.
> From
> > an efficiency standpoint, it would be like setting a maximum of 80% on the
> > variac.
> 
> To add an inductance in series with the primary, not coupled to the
> secondary,
> is theoretically equivalent to decrease the coupling coefficient and
> change the
> primary inductance. It is not significantly lossy if wire as thick as
> the primary
> wire is used. The energy transfer is exactly as in the regular case.
> Couplings
> to nearby objects may be a problem, however.
> 
> Antonio Carlos M. de Queiroz

	If the added tuning inductance is a relatively small fraction of the
total inductance then the change in k is also small.  Certainly the
effect is real.

Ed

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