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monobander using the method outlined by Jay Terleski, WX0B, of Array Solutions. The details of the how to use a dual trace oscilloscope and a remote reference transmitting antenna are on Jay's website at: http://www.arraysolutions.com/Products/dissimilarants.htm In a nutshell, with a signal strong enough to show up on the scope, transmitted from a reference antenna some distance away, you will be able to observe the phase difference in both antennas at the end of their feedlines on the oscilloscope. With this method, all variables are accounted for, including different antenna geometry and real feedline velocity factor. What I found most interesting is the sensitivity of the measurement. In the final stages, I had a one foot section of expendable feedline which was slowly trimmed to bring the antennas into phase. Once that length was known, I trimmed that amount from the other feedline and retested. Worked like a champ. A pitfall of phasing antennas for measured gain is that it is difficult to know precisely what arriving wave angle you are optimizing. Jay has a number of other interesting nuggets on his website, including some specific information on phasing Force12 antennas. I am using his stackmatch here, and it is truly a quality piece of work. If you ever get a chance to see one of his presentations at a hamfest, don't miss it. I guess it is pretty obvious I am a very satisfied customer. 73, Hank AA4HP -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force12 Web Site: http://www.force12inc.com To Submit Message to the List: Force12Talk@qth.com To unsubscribe and view the Message Archive: see http://qth.com/force12/list For problems with the list: contact n4zr@qth.com |
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