[TowerTalk] 4 square for 80

[john at kk9a.com]

This is a good question, Tony. What do people use for choking phased
verticals. Is it necessary to choke verticals with buried radials?  The only
commercial product that I am aware of uses 100 #43 beads:
www.dxengineering.com/parts/com-cfc-75 

John KK9A

To:	towertalk at contesting.com
Subject:	Re: [TowerTalk] 4 square for 80
From:	Jim Brown <jim at audiosystemsgroup.com>
Reply-to:	jim at audiosystemsgroup.com
Date:	Fri, 27 Jan 2017 14:32:36 -0800
List-post:	<towertalk at contesting.com">mailto:towertalk at contesting.com>
On Fri,1/27/2017 1:20 PM, N2TK, Tony wrote:
Besides having beads at the feedpoints do I gain anything by putting beads a

the Comtek box? Noticeable improvement?

A string of #31 or #43 beads is next to useless at HF. Study
k9yc.com/RFI-Ham.pdf and see the "Cookbook" for recommendations of chokes
that DO work.

The purpose of a choke is to kill common mode current on the cable(s) on
which they are applied. That would, for example, prevent feedlines from
acting as radials, which could unbalance currents on the radials. It would
also prevent noise pickup on those feedlines.

73, Jim K9YC