GEORGE WALLNER wrote:
>G'day Topbanders,
>
>I am trying to measure the Q of large air would and
>toroidal inductors. I have built a jig that I use to
>series resonate the coil at the frequency of interest (1.8
>and 3.5 MHz). The series C is a high Q vacuum variable. I
>have also included a precison, non-inductive 50 ohm
>resistor in series, and using an AIM4170 analyzer I
>measure the Rs component, which should include the 50 ohm
>resistor and the resistance of the inductor. (I am
>measuring at 50 ohms because the analyzer is reported to
>be most accurate around 50 ohms.) I get consitent results
>to Q-s of up to about 120. I don't seem to be able to
>measure beyond Q 120.
>
>Is there a better -- cost effective -- method I should be
>using?
>
>TKS in advance for any advice,
>
>George
>AA7JV
>
George,
I haven't personally tried this in my lab, but the method (resistive
divider technique) appears sound and claims to be good for inductors up
to 400:
http://www.edn.com/article/CA196485.html
Good luck.
73, Mike W4EF
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