On 6/30/2022 2:57 PM, KD7JYK DM09 wrote:
I've looked on and off over the years for a tutorial, but not had any
luck, can anyone suggest a route of study for me?
Yes. k9yc.com/RFI-Ham.pdf includes an extensive tutorial on how ferrite
chokes work, as well as a lot of other fundamental EMC concepts.
k9yc.com/publish.htm includes two choke "Cookbooks," one for MF/HF,
another VHF/UHF. The MF/HF cookbook is based on more than a year of
winding and measuring more than a thousand chokes; the VHF/UHF cookbook
is based on Fair-Rite data sheets for specific cores. This material has
been in the ARRL Handbook for a while.
There's also an applications note on identifying RF noise by type and
providing advice on how to locate and kill it. It includes winding
guidelines for clamp-ons at the source of noise.
73, Jim K9YC
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