[Elecraft] Measuring Inductance with the MFJ-259

[Darrell Bellerive]

Thanks to all who responded. I had no plans of deviating from the number of 
turns that Elecraft directs. I will follow their instructions as to the best 
of my ability.

I have learned a few things:

1) Adjusting the spacing of the winding on the toroids does not change the 
inductance, just the distributed capacitance of the toroid.

2) The values specified by Elecraft are dependant on their measurement 
equipment and techniques, and my measurement equipment and techniques 
probably wouldn't show the same values. So it is not worth the trouble of 
trying to measure them.

3) Don't bother with Q-Dope or any other method of attaching the windings to 
the cores as friction is sufficient even in mobile applications.


On August 28, 2005 04:31 pm, Darrell Bellerive wrote:
> 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