[TowerTalk] FW: 4 square for 80

[Tim Duffy]

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From: Wayne Kline [mailto:w3ea at hotmail.com] 
Sent: Saturday, September 24, 2016 10:23 PM
To: k3lr at k3lr.com
Subject: Re: [TowerTalk] 4 square for 80

 

Hi Tim

 

 I agree 100% with your analogy. My experience with raised and with ground
radial screen  is one mater. But the biggest  impact I had with My 4 SQ with
106 1/4 radials WAS a 43 Mix  sleeve of 8 Beeds . The system   bandwidth
narrowed 80KC with the center freq  of the  1/4 wave feedline and antenna
length were matched and the dump power Min. The FB and Gain improved.   Not
having the equipment  as John ON4UN used to  tune and test His quadrature .

Mine was on the air reports .

 

  and IMHO  Ground screens and chocked off  phase lines  balanced the
antenna by eliminating re radiated RF into the Comtec or my old Colatchco
box.

 

Wayne W3EA  

 

 

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From: TowerTalk <towertalk-bounces at contesting.com> on behalf of Tim Duffy
<k3lr at k3lr.com>
Sent: Saturday, September 24, 2016 9:42 PM
To: jim at audiosystemsgroup.com; towertalk at contesting.com
Subject: Re: [TowerTalk] 4 square for 80 

 

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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