Vic,
What you're missing is that an antenna and its feedline are a SYSTEM,
and antennas can be unbalanced by their surroundings -- ground slope,
un-equal mounting heights, conductors in nearby buildings or structure,
trees, towers, etc. Any unbalance in the SYSTEM results in common mode
current on the feedline.
73, Jim K9YC
On 10/26/2019 7:11 AM, Victor Rosenthal 4X6GP wrote:
I have to disagree about balanced line. Unlike coax, both conductors are
exposed to external RF fields, so common mode noise will be rejected. If
the antenna and line are properly balanced (not always easy to do, I
admit) and if it is fed through a balanced antenna tuner, there is no
reason for it to be noisier than coax. Yes, it can't be choked, but it
doesn't need to be.
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