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Re: [TowerTalk] FW: 2 Element phased vertical array using Comtek Foursqu

To: Matt <maflukey@gmail.com>, "towertalk@contesting.com" <towertalk@contesting.com>
Subject: Re: [TowerTalk] FW: 2 Element phased vertical array using Comtek Foursquare Box
From: Rod Greene via TowerTalk <towertalk@contesting.com>
Reply-to: Rod Greene <w7zrc@yahoo.com>
Date: Wed, 30 Nov 2016 14:12:45 +0000 (UTC)
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Years ago, I did that with two HyTowers and the 4 sq box from Comtek if I 
remember correctly. It worked okay. Give it a try. 73 and good luck! Rod/w7zrc


      From: Matt <maflukey@gmail.com>
 To: towertalk@contesting.com 
 Sent: Tuesday, November 29, 2016 8:57 PM
 Subject: [TowerTalk] FW: 2 Element phased vertical array using Comtek 
Foursquare Box
   
The Comtek model ACB-4-A series units could be used to drive a 2 element phased 
array by connecting the 2 verticals separated by a quarter wavelength on ports 
#1 and #4 of the hybrid quadrature unit.  Leave ports #2 & #3 disconnected but 
do connect a 50 ohm dummy load to the dump port.  You will need to feed the 
antennas with 1/4 wave electrical length 50 ohm coax instead of the 75 ohm used 
in the 4-square configuration - no impedance transformation is required because 
only one antenna will be driven from the opposing sides of the hybrid bridge.  
You may also want to call Dx Engineering or Comtek and just confirm this info 
is still valid with the current series units but as far as I know it's 
essentially the same circuit.

Hope this info is helpful.  Good luck on you project.

73
Matt
KM5VI



-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Marty s
Sent: Monday, November 28, 2016 1:27 PM
To: towertalk@contesting.com
Subject: [TowerTalk] 2 Element phased vertical array using Comtek Foursquare Box

Greetings Everyone.... hope CQ WW CW treated you well,

I have everything I need to erect a 40m foursquare on my tiny urban lot in MA.​ 
It looks like I won't get it properly finished in time for this winter, but 
would like to at least get some gain out of the two verticals I have up right 
now, to get 2 directions of endfire. Can a normal Comtek box with no 
modification be used to handle this, or is it more effective for me to just 
phase the two verticals with a homebrew box relying on 1/4 wave 75ohm phasing 
lines?

Thoughts, opinions, concerns, questions?
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