Re: good doorknobs for VTTC?

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

Original poster: "Bert Hickman by way of Terry Fritz <twftesla-at-qwest-dot-net>" <bert.hickman-at-aquila-dot-net>

Steve and all,

The particular capacitor on eBay you're looking at is called a ceramic
RF power capacitor. These are used to handle a significant amount of
reactive power (as on a tank circuit or RF coupling capacitor). It is
NOT a PFC cap, even though it carries a KVAR rating. The 60 KVAR rating
refers to the amount of reactive power that this capacitor can safely
handle without overheating. This capacitor would be an excellent choice
for your VTTC, and could be re-used in a much higher power VTTC later
on.

I'm also attaching a few URL's which cover technical descriptions and
application of ceramic RF power capacitors. The first URL points to a
paper written by a very knowledgeable ham radio amateur, and is one of
the best I've seen on practical application of ceramic RF power
capacitors. The second and third URL's are from Morgan Electro Ceramics,
a UK based manufacturer of ceramic capacitors and Vishay Draloric.
Draloric is a manufacturer of ceramic induction heating capacitors. Some
of these caps are water-cooled and appear on eBay at reasonable cost. 

http://www.qsl-dot-net/i0jx/capacit.html
http://www.morganelectroceramics-dot-com/capguide3.html  
http://www.vishay-dot-com/document/22071/22071.pdf

Good luck on your VTTC!

-- Bert --
-- 
Bert Hickman
Stoneridge Engineering
"Electromagically" Shrunken Coins!
http://www.teslamania-dot-com

Tesla list wrote:
> 
> Original poster: "Steven Ward by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<srward16-at-hotmail-dot-com>
> 
> Ok,
> 
> So is a rating of 60KVAR good or bad for what i want to use these caps for??
>   Or are these caps not made to do what i want them to do.  Some one wrote
> more about KVAR, but i lost the email.  They mentioned that PFC caps are
> rated this way.  Im guessing that a PFC cap wouldnt be what i want.  Could
> someone just give an educated guess as to whether or not these caps would
> work ok for the tuning cap(cap across primary coil) in an 811A driven VTTC.
> The link is in the original message below this.  Thanks you guys.
> 
> Steve Ward.
> 
> >From: "Tesla list" <tesla-at-pupman-dot-com>
> >To: tesla-at-pupman-dot-com
> >Subject: Re: good doorknobs for VTTC?
> >Date: Fri, 12 Jul 2002 12:28:18 -0600
> >
> >Original poster: "D.C. Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> ><DR.RESONANCE-at-next-wave-dot-net>
> >
> >
> >
> >KVAR is kilo-Volts-Amperes-reactive
> >
> >Dr. Resonance
> >
> >
> >
> >
> >----- Original Message -----
> >From: "Tesla list" <tesla-at-pupman-dot-com>
> >To: <tesla-at-pupman-dot-com>
> >Sent: Friday, July 12, 2002 7:03 AM
> >Subject: good doorknobs for VTTC?
> >
> >
> > > Original poster: "Steven Ward by way of Terry Fritz
> ><twftesla-at-qwest-dot-net>"
> ><srward16-at-hotmail-dot-com>
> > >
> > > Hey guys,
> > >
> > > Your eyes may be better than mine for picking out a good doorknob for a
> >RF
> > > application as in my VTTC.  But ive found these really large(9cmx3cm)
> > > doorknobs made in Russia,  Id use 2 (or more) in parallel.  Take a look
> >at
> > > these:
> > >
> > > http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=1748353856
> > >
> > > Im guessing the size would help with the high current handling i need,
> >and
> >2
> > > in parallel will also help.  By the way what does "kvar" mean?? ive seen
> > > this all the time but dont know what it means.  Oh and by the way, this
> >will
> > > be the primary tuning cap for my coil.  Thanks guys,
> > >
> > > Steve Ward.
> > >
> > >