[Elecraft] Measuring Inductance with the MFJ-259

[Bob - W5BIG]

Hello Darrell,

The inductance of the toroids typically used in the K2 can be increased by
compressing the turns. This can be done to fine-tune a circuit but for
consistent results, it's probably best to do it the way the Elecraft guys
recommend and spread out the turns a bit.

I've evaluated a toroid, L5, in the KAT2 with both close spacing and loose
spacing.
The data can be seen here:
http://w5big.home.comcast.net/L5Analysis.htm

73/ Bob - W5BIG

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----- Original Message -----
From: "Darrell Bellerive" <va7to at rac.ca>
To: <elecraft at mailman.qth.net>
Sent: Sunday, August 28, 2005 6:31 PM
Subject: [Elecraft] Measuring Inductance with the MFJ-259


> As I build my second K2, I want to try to measure the inductance of the
> toroids with my MFJ-259. The MFJ manual has instructions on how to do
this.
> Essentially one builds a series LC circuit and measures the resonant
> frequency and then calculates the inductance.
>
> Has anyone tried this and have any tips or tricks to pass on?
>
> Am I correct in assuming I can adjust the value of inductance on a toroid
> slightly by compressing or expanding the spacing between turns? If so what
> can I use to hold the turns in place. Friction is probably good enough,
but I
> wonder about a few drops of something like Q-Dope. Comments?
>