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Re: [TowerTalk] choke / balun design needed

To: towertalk@contesting.com
Subject: Re: [TowerTalk] choke / balun design needed
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Mon, 27 Apr 2015 09:41:08 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On Mon,4/27/2015 6:50 AM, Alex Malyava wrote:
What would be the bestest design for choke or balun to be used with dipole
or OCF dipole?
Like what type of core, number of turns or number of beads?

k9yc.com/RFI-Ham.pdf

See the Choke Cookbook and text that precedes it.

An off-center fed antenna is inherently poorly balanced, so it puts a high common mode current on the feedline, which in turn places a high common mode voltage across any choke. It is well known that even very good common mode chokes are likely to fry (fail destructively) when used with even moderate power levels. You MIGHT get away with it at 100W, but at some higher power level it WILL break.

73, Jim K9YC
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