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Re: [TowerTalk] Best Balun

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Best Balun
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Wed, 26 Nov 2014 20:38:16 -0800
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On Wed,11/26/2014 6:26 PM, Jim Lux wrote:
they use a Amidon 73 mix for this particular balun

That's an exception -- a GOOD one, and was W2DU's choice for his choke balun. #73 puts the resonance in the middle of HF, so it's a good design. So I'll retract my negative comments about it -- IF it uses one of Walt's designs with 200 beads. Most so-called W2DU baluns use only 50, and some don't even use #73.

For a discussion of this, see http://k9yc.com/CoaxChokesPPT.pdf beginning on page 27.

73, Jim K9YC
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