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## [TowerTalk] Beam lobes

 To: [TowerTalk] Beam lobes sbest@cushcraft.com (sbest@cushcraft.com) Wed, 17 Jun 98 10:23:54
 ``` Ed: Can you provide more detail on what your are trying to determine? The coverage provided by an antenna beam is really a volume of space rather than an area. The enclosed volume of coverage provided by the beam lobe is a function of distance from the antenna. An APPROXIMATE formula for beam coverage area (considering only a single elevation or azimuth plane of the beam) can be found from the formula: The beam area covered by or within the lobe (in a single sweep plane) = [beamwidth/360 x pi] x distance^2 The beam volume covered by or within the lobe can be approximated by the formula [1.33 x (beamwidth in one plane x beamwidth in the other plane)/129600] x pi x distance^3 These formulas are really simple approximations. If you can provide more details on what you are specifically trying to determine, perhaps I can help further. 73 Steve Best Cushcraft Corporation ______________________________ Reply Separator _________________________________ Subject: [TowerTalk] Beam lobes Author: K4SB at InterNet To: Date: 6/16/98 4:23 PM Well, it's been over 40 years since I tried to bribe my calculus prof for a passing grade, and have forgotten most of what little I knew then. So, need a little help. Let us assume that we have a beam antenna with has major lobes centered on 30 and 60 degrees. ( or anywhere else ) These lobes have a -3bd point 10 degrees ( or anything ) each side of center.Assume F/B is infinitely high. Is there an equation which would define only the area withing the lobe bounderies? 73 Ed -- 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.htm -- 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.htm ```
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