Reg Edwards wrote:
Ferrites have as many vices as they have virtues.

Ferrite salesmen cleverly make virtues out of vices.
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But an electronics 'homebrewer' can find out characteristics anyway
,
through experimentation.

Frank GM0CSZ / KN6WH
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Only if he has first-class laboratory facilities.

And samples vary widely in their characteristics, one from another.

The best way of using one is to wind some wire on it. If it works in
your particular circuit then consider yourself lucky.
----
Reg.