[TowerTalk] FW: 2 Element phased vertical array using Comtek Foursquare Box

[Rod Greene]

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 at gmail.com>
 To: towertalk at 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 at contesting.com] On Behalf Of Marty s
Sent: Monday, November 28, 2016 1:27 PM
To: towertalk at 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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