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1. [TowerTalk] MODEL FOR TOWER (score: 1): Author: Greg Best via TowerTalk <towertalk@contesting.com>; Date: Mon, 22 Apr 2019 22:53:26 -0500; I have an 80 ft Rohn windmill tower that is equivalent or stronger than the same height SSV. The base dimension is 7 7 and the tower tapers to 24 at the top . I am wondering if anyone has a NEC model; /archives//html/Towertalk/2019-04/msg00175.html (7,011 bytes)
2. [TowerTalk] MODEL FOR TOWER (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 23 Apr 2019 09:14:43 -0700; <I have an 80 ft Rohn windmill tower that is equivalent or stronger than the same height SSV. The base dimension is 7? 7? and the tower tapers to 24 ? at the top . I am wondering if anyone has a NEC; /archives//html/Towertalk/2019-04/msg00176.html (7,912 bytes)
3. Re: [TowerTalk] MODEL FOR TOWER (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Tue, 23 Apr 2019 11:11:01 -0700; On 4/22/19 8:53 PM, Greg Best via TowerTalk wrote: I have an 80 ft Rohn windmill tower that is equivalent or stronger than the same height SSV. The base dimension is 7 7 and the tower tapers to 24 at; /archives//html/Towertalk/2019-04/msg00177.html (8,759 bytes)
4. Re: [TowerTalk] MODEL FOR TOWER (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 23 Apr 2019 13:05:41 -0700; There is also at least one equation I found on the web that computes the effective diameter of a triangular tower based on it's cross-section. It might be possible to get a reasonable approximation o; /archives//html/Towertalk/2019-04/msg00178.html (11,632 bytes)
5. Re: [TowerTalk] MODEL FOR TOWER (score: 1): Author: Dan Maguire <danac6la@gmail.com>; Date: Tue, 23 Apr 2019 15:37:34 -0700; Perhaps here: https://en.wikipedia.org/wiki/Antenna_equivalent_radius As a comparison, the lower-right of this image shows both the Leeson and Wikipedia equivalent diameter for a Rohn 25G cross secti; /archives//html/Towertalk/2019-04/msg00179.html (7,644 bytes)
6. Re: [TowerTalk] MODEL FOR TOWER (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Tue, 23 Apr 2019 18:18:20 -0700; The equation I found is tricky to express via email. The equivalent diameter is the cube root of (D x Fsquared /2), where D is the diameter of a leg and F is the face width. This doesn't do the hori; /archives//html/Towertalk/2019-04/msg00180.html (15,096 bytes)
7. Re: [TowerTalk] MODEL FOR TOWER (score: 1): Author: john@kk9a.com; Date: Wed, 24 Apr 2019 06:42:53 -0500; Great information Dan! I have always just guess when converting a tower to a wire diameter. The original poster seemed concerned that his tower would effect his horizontally polarized HF beams, I hav; /archives//html/Towertalk/2019-04/msg00181.html (7,898 bytes)
8. Re: [TowerTalk] MODEL FOR TOWER (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Wed, 24 Apr 2019 05:40:59 -0700; I have always just guess when converting a tower to a wire diameter. The original poster seemed concerned that his tower would effect his horizontally polarized HF beams, I have not seen that occur.; /archives//html/Towertalk/2019-04/msg00182.html (10,235 bytes)
9. Re: [TowerTalk] MODEL FOR TOWER (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Wed, 24 Apr 2019 05:50:58 -0700; On 4/22/19 8:53 PM, Greg Best via TowerTalk wrote: I have an 80 ft Rohn windmill tower that is equivalent or stronger than the same height SSV. The base dimension is 7 7 and the tower tapers to 24 at; /archives//html/Towertalk/2019-04/msg00183.html (8,426 bytes)
10. Re: [TowerTalk] MODEL FOR TOWER (score: 1): Author: Steve Maki <lists@oakcom.org>; Date: Wed, 24 Apr 2019 20:03:09 -0400; I have always just guess when converting a tower to a wire diameter. The original poster seemed concerned that his tower would effect his horizontally polarized HF beams, I have not seen that occur.; /archives//html/Towertalk/2019-04/msg00196.html (9,781 bytes)
11. Re: [TowerTalk] MODEL FOR TOWER (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Thu, 25 Apr 2019 05:39:42 -0700; I have always just guess when converting a tower to a wire diameter. The original poster seemed concerned that his tower would effect his horizontally polarized HF beams, I have not seen that occur.; /archives//html/Towertalk/2019-04/msg00202.html (10,854 bytes)
12. Re: [TowerTalk] MODEL FOR TOWER (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Thu, 25 Apr 2019 16:40:43 -0700; I have always just guess when converting a tower to a wire diameter. The original poster seemed concerned that his tower would effect his horizontally polarized HF beams, I have not seen that occur.; /archives//html/Towertalk/2019-04/msg00208.html (12,119 bytes)
13. Re: [TowerTalk] MODEL FOR TOWER (score: 1): Author: Gedas <w8bya@mchsi.com>; Date: Fri, 26 Apr 2019 13:45:08 -0400; One thing I have not seen mentioned (maybe I missed it) is the fact that a whole lot of time & effort is going to go into generating a super accurate model for a complex tower and antenna system but; /archives//html/Towertalk/2019-04/msg00214.html (13,522 bytes)
14. [TowerTalk] MODEL FOR TOWER (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 26 Apr 2019 10:57:29 -0700; <Thanks to you all for your questions, thoughts, and input. My original question was about interaction with the tower and really asking the question as to whether someone besides me has addressed the; /archives//html/Towertalk/2019-04/msg00215.html (10,577 bytes)
15. Re: [TowerTalk] MODEL FOR TOWER (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 26 Apr 2019 11:17:31 -0700; If I understand the original question, it's about mounting a horizontally polarized HF Yagi on the tower at a height where the tower is about 30-in square or triangular, not about loading the tower i; /archives//html/Towertalk/2019-04/msg00217.html (9,983 bytes)
16. Re: [TowerTalk] MODEL FOR TOWER (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Fri, 26 Apr 2019 12:52:29 -0700; On 4/26/19 10:45 AM, Gedas wrote: One thing I have not seen mentioned (maybe I missed it) is the fact that a whole lot of time & effort is going to go into generating a super accurate model for a com; /archives//html/Towertalk/2019-04/msg00219.html (17,209 bytes)
17. Re: [TowerTalk] MODEL FOR TOWER (score: 1): Author: Gedas <w8bya@mchsi.com>; Date: Fri, 26 Apr 2019 16:44:06 -0400; Yup, I understand what you are saying and do not disagree. A clarification please (and this assumes there will be some interaction between tower and antenna worth worrying about).....were you referri; /archives//html/Towertalk/2019-04/msg00220.html (10,438 bytes)
18. Re: [TowerTalk] MODEL FOR TOWER (score: 1): Author: Michael Tope <W4EF@dellroy.com>; Date: Fri, 26 Apr 2019 14:33:23 -0700; It might be worthwhile to model part of the geometry (the smallest triangle or square in the structure formed by the legs and braces of the tower) and then move it around in Z (up and down vertically; /archives//html/Towertalk/2019-04/msg00221.html (11,448 bytes)
19. Re: [TowerTalk] MODEL FOR TOWER (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Fri, 26 Apr 2019 15:10:54 -0700; Greg, A couple of thoughts about your question and some observations 1. My 20m and 15m 5L OWA's are on 36" diameter rings on 24" face Rohn 65. The SWR curves are perfect. Mounted between D1 and D2. 2; /archives//html/Towertalk/2019-04/msg00222.html (13,302 bytes)
20. Re: [TowerTalk] MODEL FOR TOWER (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Fri, 26 Apr 2019 15:42:21 -0700; On 4/26/19 2:33 PM, Michael Tope wrote: It might be worthwhile to model part of the geometry (the smallest triangle or square in the structure formed by the legs and braces of the tower) and then mov; /archives//html/Towertalk/2019-04/msg00223.html (10,652 bytes)

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