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Re: 120 bps vs. 240 bps comparison tests
Hi John,
Thank you kindly for agreeing to perform these expts:
> Original Poster: FutureT-at-aol-dot-com
<snip>
> Thanks for the futher info. So if for instance the input power and Cp
> is doubled, then Cs (total) will have to double too. In the case where
> I use 570 watts to get the 42" spark using the 4" by 17" toroid, If I
> then double the input power to 1140 watts, the required toroid size
> to double Cs total would be quite large. If we assume the original
> Cs is 30pF (7pf in coil, 23pf in toroid), then we need 60pF in the
> new high power setup. I suspect that a 53pF toroid will be
> "too large" for best results, and who knows, it might really crimp
> the spark output and limit it to 42". In any case, it would probably
> need a break out point to permit breakout, unless it has a
> relatively small minor diameter.
That might be so if the voltage is too low for the new ROC. Perhaps a
bump to keep minimum ROC constant might be useful.
> I could probably start with a 3" by 10" toroid, at 0.0077uF
> for Cp, at a certain input power that gives one streamer at 120bps,
> then install the 0.0147uF cap, and ~double the input power, and
> verify same Vp on scope, and use the 6" by 26" toroid (which
> hopefully might give a doubling of Cs), and see what kind of
> spark length I obtain. Let me know if you see any problems
> with this proposed test, or can recommend any improvements
> in the test approach.
Sounds exactly what the test needs. Many thanks again. I'm looking
forward to hearing the results.
Regards,
Malcolm