I continue to refer folks to my extended (and rigorous) development of
the fundamentals of this. A high Q resonance is effective ONLY at
resonance, and it's a NARROW resonance, determined by length of the
cable beihg choked. A LOW Q parallel resonance where the R at resonance
his high is an effective choke over a wide range of frequencies, and is
NOT sensitive to length of the line in the common mode circuit.
Those who are too lazy to follow and study the link deserve to remain
ignorant, and will continue to believe that life is simpler than it
really is.
73, Jim K9YC
On Tue,1/13/2015 9:46 PM, Roger (K8RI) wrote:
On 1/13/2015 8:27 PM, KD7JYK DM09 wrote:
: That is NOT a choke, it is an inductor, which can resonate with a
cable
: whose length makes it capacitive. An effective choke must cause the
: common mode circuit to have a high common mode Z at the frequency(ies)
I guess there's no chance in Hell of it ever working then...
Why?
It is an inductor with substantial distributed capacitance forming a
parallel resonant circuit with a very high impedance at resonance.
A very effective method of stopping RF passage. On a single line they
are often used with a series resonant circuit to ground to effectively
short out the remaining RF.
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