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Re: Re Sparks
Gary
My secondary winding starts at 1" above bottom of form. The primary 30
degree inverted/ conical starts with inner dia. of 8.5" (1" around whole
form).
I use RQ circ static gap with a muffin fan. The total gap was .038, but
my NST won't fire my rolled poly caps efficiently at that - so I shorted
the last two gaps with copper strap and got best performance.
I have an independent RF ground using two 4' long copper ground rods 10'
apart and tied together with #8 copper stranded.
I don't know how you got your spark breakout with two toroids! My first
toroid was 5" X 25" and I couldn't get it to spark at all until I
converted to rolled poly caps. I've never tried putting a nail in the
toroid for breakout - maybe I'll stack two toroids and try it. Thanks
for the help!
Bob V
> A few questions/possibilities:
>
> Do you know what your pri/sec coupling is? If they are too far apart,
> performance will be poor.
>
> What is your total gap spacing? Performance increases, up to a point,
> with wider gaps, but so does the voltage and stress applied to the caps
> and NST. For my 15KV/60mA NST, I use 0.38" total gap. What is yours?
> You may want to play it safe and use something closer to 0.25-0.30".
>
> What kind of ground system do you have?
>
> Your toroid is slightly on the small side. I use a 4.5" x 15.5" plus a
> 6" x 23" toroid on top of it. With the two and no breakout points, it
> just barely breaks out, I have to use a nail, but I get the longest
> sparks that way. With my 4.25" x 23", 22AWG secondary, I get 51"
> sparks. See http://people.ne.mediaone-dot-net/lau/tesla/tesla.htm
>
> Regards, Gary Lau
> Waltham, MA USA