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
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
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
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
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
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
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
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
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
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