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Re: [TCML] Choosing a Cap Size

At around 4-6 kVA a .06 uF (60 nF) cap will work well.  This will give you
solid 5-6 ft long sparks. At this power level a pair of hyperbaric gaps in
series will give you good
performance.  Contact me off list and I will forward the design sketch to

I use a 100 nF value at 14 kVA for a 15 ft long spark.  Above 6 kVA the
non-synchro RSG is the way to go.  I can also send you photos of this setup.
I've found a 1725 rpm 1/2 hp motor, using pulleys, gearing the RSG (in
pillow blocks) to run at 2500 rpm, and producing around 400 PPS with a 10
electrode, 13 inch dia. rotor, is the way to go for long, thick sparks.

Dr. Resonance

On Sun, Oct 26, 2008 at 4:22 PM, Michael Robinson <muze801@xxxxxxxxx> wrote:

> Hi All,
> I am about ready to start adapting my coil to run with pig power, but
> I have a question regarding the size of Cp.  The "rules" for finding a
> cap size for for a NST are pretty well defined, but I'm having a hard
> time figuring out what to use on a pole pig coil.
> What parameters are used in finding the optimal Cp?  Should I use the
> transformer's ratings, or the actual power I'll be running it at? (ie.
> it is a 10 kva pig, but I'll most likely run it between 2 and 5 kva)
> I'd like to go STR to save on cash, but how low can I go while still
> maintaining decent spark length?  I will be running a blower gap, and
> moving to ASRSG as time and money permits.
> Thanks for any advice,
> Michael Robinson, KE7AQL
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