On 10/30/2019 6:43 AM, Roger Parsons via TowerTalk wrote:
K9YC wrote:
"Yes, but virtually all of the recommendations for #43 and #52 material are
WRONG!"
Steve is sadly no longer with us and unable to defend himself. However, he had
previously rigorously defended his methodology. He was very technically able in
both theoretical and practical matters, and I personally trust his results.
There is nothing wrong with his methodology nor his measurements. The
thing he missed, and that I also missed until recently, is the effect of
component tolerances. About a year ago, I bought 40 of the #52 Fair-Rite
cores, split into four orders over about a month from four Fair-Rite
distributors measured the characteristics of each, and put the data in a
spreadsheet. I then selected cores at the limits of Rs and Xs and wound
chokes following Steve's guidelines. None of those chokes were even
close to his published data.
My methodology is discussed in detail in
http://k9yc.com/2018Cookbook.pdf
73, Jim K9YC
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