Secondary coil?

From:  Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent:  Tuesday, April 14, 1998 4:57 PM
To:  Tesla List
Subject:  Re: Secondary coil?

Hi Mel,

> From:  mel wise [SMTP:mwise-at-ns.sosis-dot-com]
> Sent:  Saturday, April 11, 1998 11:37 AM
> To:  tesla-at-pupman-dot-com
> Subject:  Secondary coil?
> I have been reading a lot of posts on secondary inductance and primary
> inductance. I have came to the conclusion that most agree that you should
> try to get the highest inductance and still keep the total turns below a 
> 1000. One thing isn't clear though, should overall capacitance of the
> secondary be kept to a minimum. For example you can wind a     4.25"x26.08"
> w/22awg allowing 14.50mH and 9.85pf at 405khz or you can wind a 4.25"x17"
> w/24awg allowing 14.50mH and 7.54pf at 493khz. Assuming this gives us
> 2.31pf difference and a 88khz difference. Which one should out perform
> other? Or will they perform the same? I personally have not tried this out
> to see which or if either would out perform the other.
> So if anyone knows the outcome of this one, I would appreciate the feedback.
> Thanks,
> Chris

You are going to run into output voltage limitations with the 
seemingly better secondary when running the same Ep. I'd go for the 
taller coil of the two. Besides, if Lp is the same, the taller one 
should have the lower ESR/higher Q of the two.