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Ah, yeah. First read the inductance of the coil, and the resonant frequency of a good specimen. Now add a capacitor in parallel with the internal cap and note the new, lower resonant frequency. I won't bore you with the math for now. I'd have to look it up. Just the same, the difference in frequency you get from your added cap should allow calculating the internal cap's value.

More trouble than I've been willing to go to.

73

[QUOTE="nomadradio, post: 788027, member: 22"] Ah, yeah. First read the inductance of the coil, and the resonant frequency of a good specimen. Now add a capacitor in parallel with the internal cap and note the new, lower resonant frequency. I won't bore you with the math for now. I'd have to look it up. Just the same, the difference in frequency you get from your added cap should allow calculating the internal cap's value. More trouble than I've been willing to go to. 73 [/QUOTE]

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