[TowerTalk] Choking on chokes

[Steve Hunt]

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.