Re: [TCML] Toroid Capacitance

[Joe Mastroianni <joe@xxxxxxxxxxxxxx>]

Hi Nicholas,

I have used JavaTC on probably 8 different coil designs at this point, though none with an f0 that high.
However, with resonators of f0 value between 37khz and 130khz the JavaTC models are amazingly accurate.  You have to be very diligent with your physical measurements, though.  It's the usual garbage-in-garbage-out that is true with any program.  You are only going to get out the accuracy you put in.  

I'd imagine with a frequency that high if you were off in your physical measurements by 1/16" of an inch, it could account for the 12% difference between measurement and calculation you are seeing.

Again, I've not run JTC on a resonator of that frequency so I don't know if you're somehow in the outer bounds of the models.  But I suspect not.

Cheers,
Joe

On Sep 16, 2011, at 7:15 AM, Nicholas Hall wrote:

> Hello All -
> 
> I recently have been tuning my coil and found it interesting that my
> numbers were quite a bit off of that of JavaTC.  Essentially I found
> the resonant freq of my secondary with a signal generator and a scope.
> My tests shown I resonate at 274khz; JavaTC has me down at 240khz.
> I'm trying to figure out what JavaTC is not accounting for with my
> setup.
> 
> Does density of a toroid affect capacitance or is it strictly
> dimensions?  Also wondering if I measure topload capacitance with a
> simple capacitance setting on a Fluke multimeter?  I've been thinking
> of purchasing one.
> 
> Thanks
> 
> Nicholas Hall
> 262.706.1337
> ngharo@xxxxxxxxx
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