>I've seen references to Fair-Rite #31 toriod
>cores in various places, but haven't been able to find any in their
>catalog. Do they actually exist in the wild? Beads abound, but it would
>be nice to be able to build high-impedance chokes in less than several
>straight feet of cable.
Sometimes I get the feeling that folks don't bother to read what I took
great pains to learn and write about this.
REPEATING:
Appendix One of my tutorial lists the Fair-Rite part numbers of selected
parts that, based on their dimensions and mix, are useful for coax chokes
and for suppressing RFI. It also includes a list of industrial electronics
vendors who sell at good prices, especially if you buy in quantity.
http://audiosystemsgroup.com/RFI-Ham.pdf
The main part of the tutorial tells you how RFI happens, how ferrites work,
how to use them to kill RFI, how to use them to wind chokes.
It took me a LONG TIME and a LOT of STUDY and research to figure all this
stuff out. Expect to spend some time STUDYING it yourself. I've tried to
write it so that you don't need an EE degree or a lot of math to understand
it, but you do need to understand circuit fundamentals. But if you do
happen to be an EE, there's enough technical description of what I'm
talking about to convince you that it's "real."
73,
Jim Brown K9YC
73,
Jim Brown K9YC
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