[TowerTalk] 4 square for 80

[Tim Duffy]

Hello Sam,

If there is a concern about a feedline in any antenna system having common
mode issues, then yes, system performance may be enhanced by installing
chokes at the box as well.

73
Tim K3LR

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
samsadventure at gmail.com
Sent: Sunday, September 25, 2016 8:58 AM
To: jim at audiosystemsgroup.com; towertalk at contesting.com; k3lr at k3lr.com
Subject: Re: [TowerTalk] 4 square for 80

Tim, I have the W7DD version of the vertical dipoles for my 4-square with
the Comtek box (from DXE).  I understood from the instructions that I needed
the chokes at the ends connected to the antenna.  Should I also have chokes
at the feedline connection (Comtek box) ends?






Sam N5FO






From: Tim Duffy
Sent: ‎Saturday‎, ‎September‎ ‎24‎, ‎2016 ‎7‎:‎42‎ ‎PM
To: jim at audiosystemsgroup.com, towertalk at contesting.com





Hello Jim,

We are talking about feedlines that are 20 feet (feedlines) above the
ground. They have to be choked (both ends). The raised radial application
(which is not as good as the ground mounted solution with 64 plus radials).
The feedlines must not be radials - that is why they must be choked.

73,
Tim K3LR

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Jim
Brown
Sent: Saturday, September 24, 2016 3:36 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] 4 square for 80

On Sat,9/24/2016 10:07 AM, David Robbins wrote:
> I fail to
> see why the shield of the feedlines is different from the radials it is
connect to at the base of the vertical.

The radials are not connected to anything at the far end. The feedline is.

I've seen several recommendations from people I view as "authorities" 
say that the feedlines of vertical antennas should be choked. Sorry, I 
don't recall who.

73, Jim K9YC

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