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Re: Spark type question
From: David Knaack[SMTP:dknaack-at-rdtech-dot-com]
Sent: Friday, November 07, 1997 11:15 AM
To: Tesla List
Subject: Re: Spark type question
>
>From: Julian Green[SMTP:julian-at-kbss.bt.co.uk]
>Sent: Monday, November 03, 1997 8:26 AM
>To: tesla-at-pupman-dot-com
>Subject: Re: Spark type question
>
>If you measure the current flowing in a capacitor as frequency rises so
does
>the current. (Zc = 2*Pi*F*C)
>
>Air has capacitance, so as the frequency of your coil goes up the more
>significant the air capacitance becomes. This is why a tesla coil can
generate
>sparks that terminate in thin air. Low frequency tesla coils generate
more
>solid arcs with fewer wispy bits as the air capacitance is less
significant.
>At higher frequencys like 1MHz you get no streamers at all, just loads of
corona,
>it looks like a gas cooker flame. A good middle ground is about 150KHz.
>
>Julian Green
What happens as you push up into multi-MHz? GHz? How much power could
a GHz coil process? It seems like it would have to be tiny.
A while back a few people did some micro coils, what was the smallest,
and what was its approx frequency?
I'm thinking about doing one of these mini-coils, since they are
relatively
inexpensive to set up. Do the standard aspect ratios and turn counts
still apply?
How about spark gaps for such tiny coils, is there a better way, or do you
just have to use really small gaps?
Thanks for the info!
DK