On 7/21/2020 10:38 AM, Steve Maki wrote:
From what I've heard, the properties of ferrites can vary wildly,
especially from run to run, so unless you measure the one you make, you
don't know.
OTOH, I'm not sure that it's possible to make a choke using recommended
(by K9YC) method & parts and end up with a *useless* choke.
My recent (2018) Cookbook is the result of measuring several hundred #31
cores, selecting four at opposing limits of their characteristics,
winding chokes on each, and tabulating Z data in a spreadsheet for each
ham band. Recommendations for each band and each cable type are on the
basis of the choke meeting spec on the WORST of those cores as well as
the best.
73, Jim K9YC
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