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Now now Tony, be carefull in what you say and how you say it
If you placed several dipoles above each other in an array, say nine of them within a height change of half a wave length, in line and each of the dipoles/elements were resonant at the same frequency you are then infering ......,at least I think you are,....... that the lowest dipole/element will have the highest TOA, the next element in height will have a lower TOA and progressively until one energises the top element to get the lowest TOA of them all............ If that is what you are saying........... then you could not be more wrong. I am sure that those who are really knoweledgable in the field will agree with me. Ofcourse somebody lacking true knoweledge will produce a fake series of radiation patterns for each element in the array but that is par for the course on this newsgroup. But then again often interpretations can be varied and thus in error if so I apologise. Best Regards Art Tony VE6MVP wrote: On 14 Oct 2006 22:59:10 -0700, " wrote: That actually changes it a lot less than raising and lowering significantly. HF yagis a wavelength or two above ground don't have laser-like beams. The elevation pattern is set up substantially by ground reflection, not only the antenna's free-space elevation pattern. Gotcha. That makes sense. Thanks, Tony |
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