Another thought here:
What about a quarter wave from the mast as aposed to half wave spacing out from the mast? My understanding is 2 dipoles a half wave out from the mast will exhibit a good north-south pattern when pointing east. I don't care in my situation about the west which is where the tower is located. East, is mountains so don't care too much either. I only really need/want north-south coverage. Tower is 160ft Rohn selfsupporting up at about the 140ft level. I will know soon how it performs. Brian, k5in ----- Original Message ----- From: Laryn Lohman To: [email protected] Sent: Saturday, July 25, 2009 7:33 PM Subject: [possible spam] Re: [Repeater-Builder] Re: The True Pattern of a DB224 --- In [email protected], "NORM KNAPP" <nkn...@...> wrote: > > What happens when you put two dipole facing one direction (the same) and two facing the exact opposite (180 degrees from the other two)? This is the pattern that the engineer from DB was explaining to me. The way he described it, for example, if two dipoles are east and the other two west, maximum gain would be north and south. But not much gain, less than 1 db gain north and south. Barely worth it. Seems counter-intuitive, but I made sure that I properly understood at the time what he was explaining. The way he put it-- north and south both "see" all four dipoles so both directions get something from all four of them. It would be VERY interesting if someone good with EZNEC or other modeling program would run some of these configurations, plus others not <in the book>, would it not? Laryn K8TVZ
