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1. [RFI] Common mode chokes (score: 1): Author: Chuck Hutton <charlesh3@msn.com>; Date: Fri, 19 Mar 2010 01:31:09 +0000; Hi - I've been using up some FT240-J cores to wind common mode chokes for Beverage antenna feedlines. I use these antennas only for LW, MW and 160 m listening. In looking at the Fair-Rite data for #3; /archives//html/RFI/2010-03/msg00074.html (7,146 bytes)
2. Re: [RFI] Common mode chokes (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Thu, 18 Mar 2010 19:43:46 -0600; Chuck, Material "J" also known as material "75" generally has a permeability of 5000 while "31" material has a permeability of 1500. I would leave well enough alone. Larry, W0QE _____________________; /archives//html/RFI/2010-03/msg00075.html (7,340 bytes)
3. Re: [RFI] Common mode chokes (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 18 Mar 2010 22:14:46 -0700; Larry, You're missing the point of how ferrite chokes work. IT'S NOT ABOUT INDUCTANCE, IT'S RESISTANCE! An effective ferrite choke is a VERY low Q parallel resonant circuit tuned to the frequency you; /archives//html/RFI/2010-03/msg00076.html (9,589 bytes)
4. Re: [RFI] Common mode chokes (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Fri, 19 Mar 2010 00:31:43 -0600; Jim, I beg to differ with you. Effective common mode choking is about impedance and not just resistance. I know that if the impedance is nearly all due to inductance, external capacitances can render; /archives//html/RFI/2010-03/msg00077.html (7,672 bytes)
5. Re: [RFI] Common mode chokes (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 19 Mar 2010 00:04:18 -0700; That's exactly the point. But those chokes are much less effective, because they tend to have a much lower impedance than a multi-turn choke on #31 in its resonant region. AND those simple chokes can; /archives//html/RFI/2010-03/msg00079.html (9,797 bytes)

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