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Re: [TowerTalk] G5RV balun question

Subject: Re: [TowerTalk] G5RV balun question
From: Jim Brown <>
Date: Thu, 10 May 2012 23:38:59 -0700
List-post: <">>
On 5/10/2012 2:39 PM, John G. wrote:
> I am wonder if adding a coax choke balun (several turns of coax wound up in a 
> circle) would help at all.

No, that would be of zero benefit.  What COULD help is winding multiple 
turns of the coax through #31 ferrite cores, or building one of the 
bifilar chokes described in my RFI tutorial. See the Choke Cookbook and 
the tutorial material about chokes in the preceding chapter of

What the choke does is keep RF off of the feedline, and, because 
antennas work the same on both RX and TX, prevents the feedline from 
being part of the antenna.  Yes, the potential benefits are less RF in 
the shack (and your neighbor's living room), and less noise pickup on 
the feedline.  Is this SURE to help? Nope -- but it can't hurt (unless 
you manage to break something in the process), and whether it helps will 
depend entirely on conditions in and around your QTH, and how your 
antenna and feedline relate to noise sources. But in today's nasty RF 
noisy environment, we need all the help we can get.

73, Jim Brown K9YC

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