On 7/1/2021 8:15 AM, hzp_electronics@juno.com wrote:
Don't forget that a toroid is a 'one-turn loop' that can couple to other things.
As W8ZR correctly observed, a winding on a ferrite core is
"self-shielded," because the higher mu of the coil causes most of the
field to be contained within the core. The higher the mu at the
frequency of interest, the greater this effect. But as I noted in my
first post in this thread, mu (mu' +j mu'') vary widely with frequency.
Where mu' describes the inductive effect of the core, and mu'' the loss
component.
73, Jim K9YC
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