On 9/26/2025 2:17 PM, Jack Brindle via TowerTalk wrote:
Sigh. I am fairly certain that I have seen, at NCCC meetings, 4” toroids in
your preferred mix wound for testing.
Yes, I hoped they would be a useful tool, but when I built and measured
about 70 chokes in multiple winding styles, they turn out to be useful
only on 80 and 160M.
And Fair-Rite #31 mix is the only ferrite I've found that is useful for
chokes at HF and 160M.
73, Jim K9YC
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