Yes, I have seen it before. That rule of thumb is near resonance with about 500
ohms of reactance (Xc = -j500.5 and Xl = +j471.2 ohms). If you replace 1 metre
with 37 inches, the error will be less than 1 percent :-)
For C - 1.0 pF. for every 37 inches of wavelength
For L - 0.25 uH for every 37 inches of wavelength
73
Johan SM6LKM
----
John Bruce McCreath wrote 2011-10-12 14:44:
> Hi LFers,
>
> I stumbled upon an interesting tidbit of info yesterday which I'd not seen
> before.
> Regarding ballpark figures for the L and C values required for an AMU, the
> following was suggested:
>
> For C - 1.0 pF. for every metre of wavelength
>
> For L - 0.25 uH. for every metre of wavelength
>
> Has anyone here seen this before and/or could you confirm it?
>
> 73, J.B., VE3EAR
>
> LowFER Beacon "EAR"
> 188.830 kHz. QRSS30
> EN93dr
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