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Old 4th Dec 2019, 10:34 pm   #5
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
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Default Re: Help with inductace value on ferrite core

Actually, some of what are normally seen as RFI ferrites like Fair-Rite number 43 make rather good HF transformers.

For any ferrite, there is a low band where it makes insufficient inductance to bother with, then there is a band where it makes useful inductors of low loss/high Q. Then there is a band where the losses have grown, but it is still useful as a reasonably efficient transformer, and in the highest band losses have grown to make a good RFI absorber.

Different materials just put the boundaries in different places.

David
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