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Re: [RFI] Ladder Line and RFI/Noise

To: jim@audiosystemsgroup.com
Subject: Re: [RFI] Ladder Line and RFI/Noise
From: "Rick Karlquist" <richard@karlquist.com>
Reply-to: richard@karlquist.com
Date: Tue, 19 Oct 2010 11:48:25 -0700
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
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

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