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Re: Many Things...
>
> Now that's an interesting point - Does high altitude make a significant
> difference for the gap setting?
>
> You're at the top of the state, but I'm at the midpoint (Crestone, Sangre
> de Cristo mountain chain, 50 miles south of Salida) and the altitude
> here is 8000 feet.
YES... as a rule of thumb, breakdown voltage for a given gap varies
linearly as the pressure. Since the pressure at 8000 feet is about 73%
that of sealevel, the breakdown voltage will be 73% of the sealevel
breakdown, for the same gap length.
>
> I'm also curious what kind of grounding system you use for your coils
> in this rocky, dry soil of Colorado?
The grounding system is really only relevant in the near field of the TC...
You want a low impedance (high conductivity) ground to serve as the other
"plate" of the top load. If you were to have a plate the diameter of which
was twice the height of the top of the TC above it, it would probably work
pretty well.