I beg to differ with you. Effective common mode choking is about
impedance and not just resistance. I know that if the impedance is
nearly all due to inductance, external capacitances can render the choke
less effective but there are plenty of common mode chokes made for
narrow band usage that are parallel resonant. You can hardly design a
ferrite choke with enough turn to be effective at the low end of the HF
range that does not go through the parallel resonant frequency within
the HF range.
Jim Brown wrote:
> You're missing the point of how ferrite chokes work. IT'S NOT ABOUT
> INDUCTANCE, IT'S RESISTANCE! An effective ferrite choke is a VERY low Q
> parallel resonant circuit tuned to the frequency you want to suppress.
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