While in theory, one could hook up an external capacitor in *parallel* with
the secondary coil, the voltage rating of such a capacitor would have to be
100's of kV and careful consideration of corona would be necessary. I
vaguely recall discussion many years ago, possibly in the context of a
solid state coil, of placing a VERY long series string of polypropylene
caps, internally on the central axis of the secondary, to minimize the need
for a topload. An MMMMMMMMC, if you will. I don't recall the outcome.
But regardless, it's not a viable method of tuning as there's no easy way
to vary the capacitance. Primary turns is hands down the simplest way.
Regards, Gary Lau
MA, USA
On Tue, May 24, 2022 at 7:20 PM Joshua Thomas <joshuafthomas@xxxxxxxxx>
wrote:
> While playing around in JavaTC, I realized that the overall capacitance of
> the secondary coil (and hence Fres) could be modified by placing a series
> capacitor between the coil and ground.
>
> Tuning seems to usually be done on the primary coil by tapping, but this
> also seems an option. Has this been tried, and what results/caveats were
> there?
>
> Thanks,
> Joshua
>
> --
> Joshua Thomas
>
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