[RFI] Ladder Line and RFI/Noise

[Rick Karlquist]

Jim Brown wrote:
> This discussion applies to differential coupling. There's also common
> mode coupling, of course, and antennas fed with ladder line rarely have
> a common mode choke. But they NEED a common mode choke, because nearly
> all ham antennas have at least SOME unbalance by virtue of asymmetry in
> their surroundings, their length, etc.  Yes, coax has more loss and it

Then there is always the exception to the rule:

I use common mode chokes at both ends of my open wire line.
It never occurred to me to build it any other way.
Maybe that is why I don't have any trouble with it picking up
noise.

Rick N6RK