[Lf] [Fwd: LF: loop resonant frequency]

[Andre Kesteloot]

Larry Kayser wrote:

> Tuning a large loop to resonance and measuring the loop inductance is easy
> without any instruments but a receiver and a calculator.
>
> Just couple to the loop with a toroid and put a silver mica bank of
> capacitors in series with the loop.  Feed a receiver and tune for peak in
> the noise.  Once you find a noise peak the standard resonance formula with
> the known capacitance will tell you the inductance of the loop.  To check
> it out, and what I did here, was to setup a resonance on 138.83 and another
> on 135.922.  The mathematics works very precisely down to less than 30 pf
> ambiguity, in my case just about half a kHz.  The difference is a small
> plug in bunch of small value silver mica capacitors.
>
> Larry
> VA3LK
>
> I did not originate this, Bill, VE2IQ did many years ago.