Fortunately, I know Dan, AC6LA, who is an indisputable Guru of Excel and Visual Basic. Something of very limited possibilities and not very easy to use. That’s the origin of the calculator.įrom the very beginning, I realized that I could do myself only a very basic calculator based on the MS Excel spreadsheet. And I wanted to be able to find impedances of the chokes wound on various core types and having various turn numbers. But the number of possible chokes designs is large and K9YC could not build and measure all of them. Especially the publication of K9YC contains a lot of information. I used in the article the measurement results published by K9YC ( ) and GM3SEK ( ). Thanks to the effort of a few fellow hams, we have got some web resources showing the measurement results of such chokes. After writing an article for the QEX Magazine: “Designing Antenna Systems for Low Common Mode Current in Coaxial Feed Lines” (this article should be published in the July-August issue if not postponed again), I realized that there was a need for a calculator that could enable you to calculate the common-mode impedance of an RF choke (a.k.a.
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