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## Re: [TowerTalk] 4 Square phase line length question

 To: "Jim Lux" , "Dan Levin" , Re: [TowerTalk] 4 Square phase line length question "Tom Rauch" Tom Rauch Sun, 9 May 2004 12:30:54 -0400
 ```> > The hybrid does NOT provide equal voltages at the output > > ports, and it requires matched loads for predicted phase. > > However, it's presumed that one could adjust fewer components in the hybrid > to compensate for the band change than fiddling with each element. A four square has two elements on the diagonal fed in-phase to form a virtual single center element. It is really like a three-element in line array with a very wide center element. Let's assume we tweak components to obtain a 90-degree shift (which is not optimum anyway) and correct VOLTAGES at the output port compared to the common point. The hybrid only controls the current and phase relationship between two out of the three (virtual) elements. Tweaking the ratio and phase between two elements and ignoring the other isn't likely worth the effort. The array requires equal currents in each element ( the fact there are two center elements is what gives it what is effectively a 1:2:1 current ratio), and it requires a phase shift larger than 90-degrees for optimum pattern. How would we handle the remaining port in reference to the other elements? Add another network? How would we measure and adjust that mess? I think it is better to leave it all alone than to open a can of worms that could likely make things worse!! Hybrids work OK as is. If someone wants an exceptional array, they wouldn't use 90/180 degree shift, a dump resistor, and they wouldn't use a system that forces equal power. A person that fussy would not be using a hybrid. 73 Tom _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA. _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
 Current Thread [TowerTalk] 4 Square phase line length question, Dan Levin Re: [TowerTalk] 4 Square phase line length question, Tom Rauch Re: [TowerTalk] 4 Square phase line length question, Jim Lux Re: [TowerTalk] 4 Square phase line length question, Tom Rauch Re: [TowerTalk] 4 Square phase line length question, Michael Tope Re: [TowerTalk] 4 Square phase line length question, Tom Rauch Re: [TowerTalk] 4 Square phase line length question, daniel hearn Re: [TowerTalk] 4 Square phase line length question, Jim Lux Re: [TowerTalk] 4 Square phase line length question, Jim Lux Re: [TowerTalk] 4 Square phase line length question, Tom Rauch <= Re: [TowerTalk] 4 Square phase line length question, Jim Lux Re: [TowerTalk] 4 Square phase line length question, Tom Rauch [TowerTalk] Texas Tower (Irving, TX) Aluminum Tower info, Mahlon Haunschild