At 05:09 AM 7/31/2001 -0700, Bill Turner wrote:
> >> It seems, on the surface, that one could dip a small air variable in
> >>(pure) water and have a high voltage part with 80x the capacity of the
>Or, if not water, some non-conductive liquid. Don't have a dielectric
>chart handy, but there must be something suitable.
Transformer oil (or nearly any mineral oil) would work quite well. The
dielectric constant typically is just over 2.0, and the voltage insulating
characteristics are excellent. A good application would be for the tune
cap on 160 or 80 meters : a 150 or 200 pf, 1000V air variable would become
a 300 or 400 pf HV variable cap.
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