Re: Spaced Coil measurements.

• To: tesla-at-pupman-dot-com
• Subject: Re: Spaced Coil measurements.
• From: Ed Phillips <evp-at-pacbell-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Thu, 03 Jun 1999 00:27:12 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

"
Hi Malcolm, All,
    Using your measurements I get 18.25 pF from Medhurst's formula.  I
plotted your data in Excel as 1/(f^2) VS C according to Howe.  A
linear trend line fit to the data crosses the axis at about -50 pF.
50 pF seems a bit high.  You gave Ns = 38 turns for the whole coil?"

	My calculations agree almost exactly with Malcom's.  I have always
found very good agreement (typically better than 5%) betweem the
measured and calculated SRF's.  Do you have extra long leads, and do you
really know the capacitance of your test capacitor?

Ed

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