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## [TowerTalk] EZNEC

 To: [TowerTalk] EZNEC gmyers@cetlink.net (Gary Myers) Sun, 07 Dec 1997 09:38:13 -0500
 I am aware of issues related to verticals and dipoles - what to expect and not expect. I expect and saw the dipole at ~1/2W had a lobe at 34 degrees, this looks right. Its elevation beamwidth is 41.5 degrees - its azimtughal BW is 94.4 (@ 34 deg Ele). I can see the vertical has predominant low angle radiation - its main lobe is at 24 degrees with a elev BW of 39.9 degrees. The vertical is modeled with 8 radials placed 3' above ground. The dipole is modeled at 30'. Everything at the moment is at 14 Mhz. The problem I have is that the relative gain between them is as such: Dipole Elevation Angle Vert -5.11 5 -6.62 0.53 10 -2.78 3.48 15 -1.21 5.23 20 -0.55 6.24 25 -0.40 6.73 30 -0.59 6.81 35 -1.05 Thus in all cases the dipole is stronger. Now I am aware of other issues mainly considering polarization but I would think that if these RELATIVE numebers were true the dipole, again at a lowly 1/2W, would enjoy a far superior reputation than the vertical! At 15 degrees for example the dipole is almost 5 db stronger!!! I suspect I am doing something wrong with the modeling (again I just got this program yesterday). But I do not know what!!!! The dipole model is what they start you with in the examples - modified per the instructions in the manual. The vertical is the vertical model they have with radials added. I can do just theirs with no radials - i.e. no mods to the model, and I get max lobe at ~-3 db which seems right with no radials. So if we could concentrate on what I might have wrong in the model, assuming these numbers above are indeed incorrect relative to each other. If the numbers are correct then why is a vertical far superior to a dipole at 1/2W. Is it strictly vertical vs. horizontal polarization?? tnxs, G. -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com Search: http://www.contesting.com/km9p/search
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