How to measure Common Mode blocking impedance?

[W4ZQ]

This may have been covered by the various topics on ferrites. I am trying to measure the blocking impedance or R value of the impedance as it pertains to ferrite chokes. There was one description by Owen Duffy (https://owenduffy.net/blog/?p=3489) that I tried but the measured values looked a bit off. Is there a better way?

Thanks, Terry, W4ZQ

[John G3PQA]

Terry,
You may be aware that Jim Brown K9YC has done a lot of work on this subject. For example:-
k9yc.com/2018Cookbook.pdf
www.k9yc.com/CoaxChokesPPT.pdf
John

On 24/04/2020 02:36, W4ZQ wrote:

This may have been covered by the various topics on ferrites. I am trying to measure the blocking impedance or R value of the impedance as it pertains to ferrite chokes. There was one description by Owen Duffy (https://owenduffy.net/blog/?p=3489) that I tried but the measured values looked a bit off. Is there a better way?

Thanks, Terry, W4ZQ

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[Sparky]

Hi John,

I wrote a fundamentals paper on this for the QRM website that I co-developed in VK.

https://qrm.guru/the-truth-about-ferrites/

Maybe this document will answer some of your questions.

Regards, Ian VK3BUF

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