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Re: [TowerTalk] [Tower Talk] balun beads for 9913

Subject: Re: [TowerTalk] [Tower Talk] balun beads for 9913
From: Jim Brown <>
Date: Sun, 10 Oct 2010 00:32:44 -0700
List-post: <">>
  On 10/9/2010 1:09 PM, jimlux wrote:
> You want to look at K9YC's write up for details, but I use 2.4" #31
> toroids for pretty much everything (since I have a whole box of them)  I
> haven't tried them at 50 MHz, though.

For 50 MHz, you want two or three turns through a 1-inch long core and 
two turns through a 2-inch core,. and for maximum noise suppression, you 
will want at least three of these multi-turn chokes in series along the 
line, close to the feedpoint. The reason you need multiple chokes in 
series is that you only need 2-3 turns to put the resonance at 50 MHz, 
so you haven't got much benefit from N-squared.  Fair-Rite  #43 and #31 
are roughly equivalent at 50 MHz.

73, Jim K9YC

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