[Amps] Swan Mark 1 on 160 meters

[Jim Brown]

On 7/1/2021 8:15 AM, hzp_electronics at 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