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Arie 4NEC2 wrote:
I would be very glad to know what you think could be added to 4nec2 to make it even better. Thanks again for fine software Arie. Things I would like to see is incorporation of terrain simulation with antenna design. Few zones of different "ground quality" (radials, sand, salt water) with linear and/or circular boundaries plus sloping terrain (contour profile). Example would be four square array on the sloping hill of sand some distance from the ocean. Verticals are very sensitive to the ground quality and terrain slopes/profile and this feature would be a great tool in quest for maximizing the performance of array by using the terrain features (enhanced F/B). K6STI has Terrain Analyzer (?) I have never tried it, but I understand that he uses free space pattern of antenna and then applies the geometry and quality of ground. I can see that more true representation of antenna's performance is to tweak the design with real ground/terrain situation. Vertical antennas, where ground participation makes significant difference in the tuning of array, would be more closely modeled by using real ground rather than free space (who's got it anyway?) and then doing optimization with given ground/terrain situation. Enough challenge? I don't know of any software that would do optimization with participation of ground/terrain. Thanks again! Yuri, K3BU |
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4NEC2:
Yuri, what a strange coincedence. This because I exactly had the same thoughts. I must admit however that I am not such a (theoretical) antenne expert, so I think it's a bit too much effort to create the equations for terrain analysis myself. That's why I already took a look at both the K6STI program and Dean Straw's latest HFTA program, (both created to do terrain analysis) and to investigate how much effort it would take to interface with one of them. When looking at these programs I realized however that both of them are limited to horizontal polarized ((stacks of) Yagi) antennas. I understand that Dan is coming up nd testing new version of his terrain program. I have not seen it yet. Fine tuning the vertical arrays can use contribution from the terrain (like being on the shore with sand dunes behind), This would greatly enhance the modeling capabilities. Keep it in the forefront :-) 73 Yuri |
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