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