Re: Tune?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

>At 10:02 AM 1/21/2002 -0500, you wrote: 
>Just out of curiosity, why would you set a limit of 0.017uF for a 15/60 NST. 
> I have heard of some using 4 times the impedance match value(resonant cap). 
> Now understandably, this would tend to create losses due to high current, 
>but if the primary coil had sufficient impedance it would still work.  If 
>someone were to wind a 6 by 30 coil with, say 28g wire, a larger cap might 
>be the best way to allow it to be tuned properly. 
>Mike 
>
>

Hi Mike,

17nF is the highest value a static gap 15/60 NST system can charge too full
voltage (21kV).  Higher capacitance values start to load the transformer
down and the voltage drops off.  A rotary gap system can go to 28nF due to
inductive kick effects pupmping greater charge into the primary cap.  This
is in the data at:

http://hot-streamer-dot-com/TeslaCoils/Misc/NSTStudy/NSTStudy.htm

Cheers,

	Terry


>
>Hi Bill, 
>
>A 15/60 neon with a static gap can take up to a 0.017uF primary cap.  So 
>you should be able to just add more capacitance to lower the primary 
>frequency.  You can also add inductance to the primary with another coil 
>inline or even just a bunch of extra wire added.  These inductances are 
>pretty small and even a 3 foot length of wire adds considerable inductance. 
>A smaller top load will also raise teh secondary frequency to match up to 
>the primary. 
>
>Cheers, 
>
>   Terry 
>
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>
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