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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[TowerTalk\]\s+Isolating\s+adjacent\s+4\-Squares\s*$/: 10 ]

Total 10 documents matching your query.

1. [TowerTalk] Isolating adjacent 4-Squares (score: 1)
Author: Charles Morrison <junkcmp@gmail.com>
Date: Sun, 20 Dec 2020 12:22:54 -0500
I have an 80M wire 4-square around tower #1. (90ft with two big 10M & 15M monobanders) Each vertical has 12 above ground radials and is tuned to 3535. All guys are broken with insulators. This array
/archives//html/Towertalk/2020-12/msg00064.html (7,366 bytes)

2. Re: [TowerTalk] Isolating adjacent 4-Squares (score: 1)
Author: Mpridesti via TowerTalk <towertalk@contesting.com>
Date: Sun, 20 Dec 2020 14:21:44 -0500
Charlie Thought I had a similar challenge and built a box with 4 spst relays mounted right at Comtek box that when powered, would short out all 4 elements of the 80 m 4 sq At the end of the 1/4 wave
/archives//html/Towertalk/2020-12/msg00065.html (8,922 bytes)

3. Re: [TowerTalk] Isolating adjacent 4-Squares (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Sun, 20 Dec 2020 15:08:15 -0600
Charlie, Are you sure it is not the tower itself that is degrading the performance of the 4-square?  If so, you may be able to detune the tower with a gamma match. That worked on 160 for me with a 70
/archives//html/Towertalk/2020-12/msg00066.html (9,661 bytes)

4. Re: [TowerTalk] Isolating adjacent 4-Squares (score: 1)
Author: "Mike Smith VE9AA" <ve9aa@nbnet.nb.ca>
Date: Sun, 20 Dec 2020 18:49:48 -0400
Charlie, I am by no means any kind of authority on isolating 4-squares even though I own a few. I do note that on my 80m 4-square, my pattern and gain is "off" to my Northwest. Coincidently(?), there
/archives//html/Towertalk/2020-12/msg00067.html (7,350 bytes)

5. Re: [TowerTalk] Isolating adjacent 4-Squares (score: 1)
Author: "Tim Duffy" <k3lr@k3lr.com>
Date: Sun, 20 Dec 2020 22:34:37 -0500
Hello Charlie: This is going to be tough with all of these wires so close together - to make both bands work right. Elevated radials further complicates the problem..1/4 wave shorted stubs on the 160
/archives//html/Towertalk/2020-12/msg00068.html (9,677 bytes)

6. Re: [TowerTalk] Isolating adjacent 4-Squares (score: 1)
Author: john@kk9a.com
Date: Mon, 21 Dec 2020 07:05:34 -0600
Did you model this before building it? From the little bit of vertical array modeling that I have done I found the patterns easily skewed by other verticals and towers, even those pretty far way. You
/archives//html/Towertalk/2020-12/msg00069.html (8,275 bytes)

7. Re: [TowerTalk] Isolating adjacent 4-Squares (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Mon, 21 Dec 2020 10:33:05 -0600
The interactions, based on my modeling, usually affects the nulls in the pattern much more than the forward gain. This is mainly a concern for receiving. 73, Scott K9MA John KK9A I have an 80M wire 4
/archives//html/Towertalk/2020-12/msg00070.html (9,413 bytes)

8. Re: [TowerTalk] Isolating adjacent 4-Squares (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Mon, 21 Dec 2020 11:17:41 -0800
Having high CMI chokes at the feedpoints of all elements is needed to keep the feedlines out of the picture. You will need to experiment - trying one thing at a time. I want to reinforce the advice o
/archives//html/Towertalk/2020-12/msg00072.html (9,215 bytes)

9. Re: [TowerTalk] Isolating adjacent 4-Squares (score: 1)
Author: Ignacy Misztal <no9e@arrl.net>
Date: Tue, 22 Dec 2020 10:09:45 -0500
Actually, Charlie's problem is an exciting one to look at and experiment. Not sure what he means that the array is not working. I suspect poor F/B or high SWR. Many ways to troubleshoot when the weat
/archives//html/Towertalk/2020-12/msg00081.html (11,360 bytes)

10. Re: [TowerTalk] Isolating adjacent 4-Squares (score: 1)
Author: "Lux, Jim" <jim@luxfamily.com>
Date: Tue, 22 Dec 2020 08:06:19 -0800
1. Is the impedance at resonance at each feed point same for all the verticals and close to 40 Ohms? Most 4-squares have significant interaction among the elements, so you need some way to take the o
/archives//html/Towertalk/2020-12/msg00082.html (11,480 bytes)


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