[Elecraft] RX noise and 2-wire lines

[Jim Brown]

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.