The level of CM current on a transmission line is *not* directly related
to how well it is matched. You can have a badly mismatched line with no
CM current, and you can have a perfectly-matched line with lots of CM
current.
If what you say is true, you would not need a CM choke when feeding a 50
Ohm balanced antenna with 50 Ohm coax.
Steve G3TXQ
On 03/12/2014 20:21, Earl Morse wrote:
If you have an antenna that is well matched to the feed line then the CM
currents are going to be minimal. However, that match is frequency dependent
so while you may have minimal CM currents on the feedline at the resonant point
of the antenna they will change as you move away from resonance and the antenna
impedance is no longer matched perfectly to the feedline.
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