Re: Not enough pimary inductance?
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
> > 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
> > very lossy and probably noisy RF wise - that power has to go somewhere.
> > 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
> 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.
> 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.