TopBand: Common mode chokes

[Tony Kazmakites]

Could someone please explain to me how common mode chokes work? I see them
advertised, but not sure exactly what they do and how they do it. When do
you use one? Do they really help?

Also, how do resonant chokes differ from baluns and single layer chokes made
of coax? Do you make the resonant choke like a coax trap? How do you check
it out?

Tnx for the info
Tony
N2TK



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