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LF: loop resonant frequency

To: [email protected]
Subject: LF: loop resonant frequency
From: "Larry Kayser" <[email protected]>
Date: Fri, 29 Mar 2002 15:35:19 -0500
In-reply-to: <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
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.



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