[Elecraft] Measuring Inductance with the MFJ-259

[EricJ]

W3FPR has the answer you need here, but I just wanted to add that you aren't
changing the inductance of a toroid by changing the coil spacing. You are
changing the distributed capacitance of the toroid by doing so. 

Eric
KE6US
www.ke6us.com

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Darrell Bellerive
Sent: Sunday, August 28, 2005 4:32 PM
To: elecraft at mailman.qth.net
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?

73,
Darrell
--
Darrell Bellerive
Amateur Radio Stations VA7TO and VE7CLA
Grand Forks, British Columbia, Canada
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