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Old 5th Dec 2019, 9:49 am   #7
GMB
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Join Date: Aug 2003
Location: near Reading (and sometimes Torquay)
Posts: 3,086
Default Re: Help with inductace value on ferrite core

For SW frequencies the best cores seem to be dust-iron, not ferrite.

What I do with unknown cores is wind a turn or two on it and use an aerial analyser to measure the impedance. Ferrite cores usually look purely resistive and dust-iron looks inductive.
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