[TowerTalk] Measuring Ferrite

Steve Hunt steve at karinya.net
Sun Apr 13 04:31:11 EDT 2014

That method can work well if you simply want to distinguish between a 
couple of cores with widely spaced "cross-over" frequencies; but if the 
core is a complete unknown, it may not work so well. For example, take a 
look at the Fair-Rite data for #31 vs #79, or #51 vs #44; you'd be 
hard-pressed to tell which was which, especially when you then factor in 
an allowance for manufacturing tolerance.

Steve G3TXQ

On 12/04/2014 22:25, Richard (Rick) Karlquist wrote:
> If you just want to identify what type of ferrite you
> have, the easiest thing to do is measure the frequency
> at which the phase of the impedance is 45 degrees and
> then compare this to the frequency where the
> epsilon' and epsilon'' curves cross over.
> Rick N6RK

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