Re: Secondary and Capacitor

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

Original poster: "J. B. Weazle McCreath by way of Terry Fritz <twftesla-at-qwest-dot-net>" <weazle-at-hurontel.on.ca>


At 04:50 PM 21/12/02 -0700, you wrote:
 > Original poster: "Centauri by way of Terry Fritz <twftesla-at-qwest-dot-net>"
 ><centauri010-at-attbi-dot-com>
 >
 >Hey everyone,
 >
 >I finished winding my secondary two days ago and I've been coating it
 >with  gloss finish oil based polyurethane since then.
 >

<SNIP>

 >Also, how precise does the capacitance of the tank circuit need to be?
 >Ideally I'd like to use MMC caps, but due to money constraints for the
 >time being, I think I'm going to go with a saltwater bottle cap.
 >But I'm not sure how to make a cap like this with the precise
 >capacitance I need.  Also, I have no way of measuring capacitance.
 >

I made a Geek Group designed bucket cap a few years back using 12 Corona
bottles in a 5 gallon plastic pail and it measured 0.011 uF. or 11 nF.
Providing you've got a few extra turns on your primary, you'll have no
trouble finding the "sweet spot" even if the cap value is off a bit.

ust take one of the nominal numbers.. I venture to say that if you were to
 >search the archives for saltwater and capacitance, you'll turn up some
 >actual measurements from someone. I think the geekgroup has some numbers for
 >a saltwater beer bottle cap in a 5 gal plastic bucket..  use those numbers
 >for now..
 >
 >Really, there's so many other things that can be fiddled or tweaked, you
 >might as well get something built and then start adjusting.  Calculating and
 >measuring to a gnat's eyelash probably isn't worth it, in most cases.
 >
 >
 >

73, Weazle, VE3EAR/VE3WZL
G-1#1214

Listening: 147.030+ and 442.075+
E-mail:    weazle-at-hurontel.on.ca
            or ve3ear-at-rac.ca
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