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1. [TowerTalk] ROHN 45 question (score: 1): Author: "Jim Barron" <wb5aaa@alltel.net>; Date: Wed, 7 Mar 2007 15:22:31 -0600; I will put up 70ft of Rohn 45 soon I Have 4 sections (40') that is about 98% new I have 3 sections (30') that is only about 80% How should I stack them? Mix them? Best on the bottom? Or best on the t; /archives//html/Towertalk/2007-03/msg00095.html (6,509 bytes)
2. Re: [TowerTalk] ROHN 45 question (score: 1): Author: DMartin560@aol.com; Date: Wed, 7 Mar 2007 19:37:26 EST; I always put the best on the bottom. KG4ADM I will put up 70ft of Rohn 45 soon I Have 4 sections (40') that is about 98% new I have 3 sections (30') that is only about 80% How should I stack them? Mi; /archives//html/Towertalk/2007-03/msg00096.html (6,800 bytes)
3. Re: [TowerTalk] ROHN 45 question (score: 1): Author: "Keith Dutson" <kdutson@sbcglobal.net>; Date: Wed, 7 Mar 2007 20:35:36 -0600; Will not make any difference how you stack them. A section good enough to put up is good enough for any position. Just be sure to pre-fit together on the ground and number each section so it will be; /archives//html/Towertalk/2007-03/msg00097.html (8,187 bytes)
4. Re: [TowerTalk] ROHN 45 question (score: 1): Author: "Ken Shutt" <kgshutt@cox.net>; Date: Wed, 7 Mar 2007 19:02:20 -0600; My recommendation is to relpace the 80 % sections with new. Please let me know, Jim, if you want to sell your 80 % sections. Ken - W5KQ (ex K5GUU) _______________________________________________ ____; /archives//html/Towertalk/2007-03/msg00098.html (8,287 bytes)
5. [TowerTalk] Rohn 45 Question (score: 1): Author: "Dick, W1KSZ" <w1ksz@earthlink.net>; Date: Sat, 25 Aug 2007 09:12:21 -0400; Background: Moving to Tucson area and putting up 80' of Rohn 45. Question: Which is preferable, a 45AG top section with a TB4 inside the top section; or, a 45G with a BPL45G and TB4 on top ? Thanks,; /archives//html/Towertalk/2007-08/msg00639.html (6,824 bytes)
6. Re: [TowerTalk] Rohn 45 Question (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Sat, 25 Aug 2007 10:42:08 -0400; Put the thrust bearing on a 45AG4 top section; the holes are already there for that purpose. Use a second bearing on a redrilled rotator shelf where the rotator would normally go and put the rotator; /archives//html/Towertalk/2007-08/msg00642.html (8,282 bytes)
7. Re: [TowerTalk] Rohn 45 Question (score: 1): Author: <john@kk9a.com>; Date: Sat, 25 Aug 2007 11:33:00 -0400; Personally I see no reason for a second bearing and I see a huge headache trying to line up a top bearing, middle bearing and a rotator on something built as unprecise as the Rohn mounting plates. Yo; /archives//html/Towertalk/2007-08/msg00648.html (7,984 bytes)
8. Re: [TowerTalk] Rohn 45 Question (score: 1): Author: K7LXC@aol.com; Date: Sat, 25 Aug 2007 12:00:54 EDT; the top section; or, a 45G with a BPL45G and TB4 on top ? I much prefer the flat-top - you can stand on it to do antenna work and overall it's easier to work with. Also, aggressive (read big mast and; /archives//html/Towertalk/2007-08/msg00651.html (7,818 bytes)
9. Re: [TowerTalk] Rohn 45 Question (score: 1): Author: K7LXC@aol.com; Date: Sat, 25 Aug 2007 12:09:24 EDT; trying to line up a top bearing, middle bearing and a rotator on something built as unprecise as the Rohn mounting plates. Your rotator already has thrust bearings and it should easily accommodate th; /archives//html/Towertalk/2007-08/msg00652.html (8,155 bytes)
10. Re: [TowerTalk] Rohn 45 Question (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Sat, 25 Aug 2007 13:00:23 -0400; Thats strange. Numerous YCCC and other serious contesters/DXers with big stacked arrays have been using dual bearings for decades with a significant reduction in rotator failures. Setting up a dual b; /archives//html/Towertalk/2007-08/msg00655.html (10,237 bytes)
11. Re: [TowerTalk] Rohn 45 Question (score: 1): Author: "Mark Robinson" <markrob@mindspring.com>; Date: Sat, 25 Aug 2007 13:06:14 -0400; How do you avoid binding? Can you let the bearings float and self align before tightening the housing down or is their a better method. Mark N1UK G3ZZM _______________________________________________; /archives//html/Towertalk/2007-08/msg00657.html (11,682 bytes)
12. Re: [TowerTalk] Rohn 45 Question (score: 1): Author: K7LXC@aol.com; Date: Sat, 25 Aug 2007 13:21:47 EDT; stacked arrays have been using dual bearings for decades with a significant reduction in rotator failures. Reduction because of what? Reduction from what to what? What actual mechanical improvement d; /archives//html/Towertalk/2007-08/msg00658.html (8,328 bytes)
13. Re: [TowerTalk] Rohn 45 Question (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Sat, 25 Aug 2007 14:04:30 -0400; Use a short length of mast and let it all float until it is aligned perfect. The holes for the lower bearing should be slightly oversize for alignment. I use a digital level for that last tiny bit. I; /archives//html/Towertalk/2007-08/msg00660.html (13,414 bytes)
14. Re: [TowerTalk] Rohn 45 Question (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Sat, 25 Aug 2007 14:19:17 -0400; I take it then that you have never experienced the installation of a large stacked array without a crane. Old wives tales? Hmmm, most of those that I know have at least a Masters degrees in an engine; /archives//html/Towertalk/2007-08/msg00661.html (10,219 bytes)
15. Re: [TowerTalk] Rohn 45 Question (score: 1): Author: "Mark Robinson" <markrob@mindspring.com>; Date: Sat, 25 Aug 2007 14:31:34 -0400; Maybe a dry lubricant like graphite would work for the bearings _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contes; /archives//html/Towertalk/2007-08/msg00665.html (13,178 bytes)
16. Re: [TowerTalk] Rohn 45 Question (score: 1): Author: <john@kk9a.com>; Date: Sat, 25 Aug 2007 14:34:23 -0400; Why would an additional bearing have anything to do with reduced rotator failure? I could only see it adding to failure due to binding. In order to not have binding all three plate would have to be v; /archives//html/Towertalk/2007-08/msg00666.html (11,418 bytes)
17. Re: [TowerTalk] Rohn 45 Question (score: 1): Author: David Gilbert <xdavid@cis-broadband.com>; Date: Sat, 25 Aug 2007 12:03:20 -0700; Carl, you pretty much avoided Steve's question. What rotator failure mode is minimized by having two thrust bearings above the rotator? Can you give any examples of your YCCC buddies that would back; /archives//html/Towertalk/2007-08/msg00668.html (12,156 bytes)
18. Re: [TowerTalk] Rohn 45 Question (score: 1): Author: K7LXC@aol.com; Date: Sat, 25 Aug 2007 15:17:23 EDT; large stacked array without a crane. Umm, since I'm a professional tower installer and work almost exclusively on ham radio projects, I've installed a bunch of large stacked arrays without a crane. W; /archives//html/Towertalk/2007-08/msg00669.html (9,009 bytes)
19. Re: [TowerTalk] Rohn 45 Question (score: 1): Author: K7LXC@aol.com; Date: Sat, 25 Aug 2007 15:33:39 EDT; ones often are well and unevenly grooved in the race; many years ago there were discussions on lubricating them before installing. And in the case of the Rohn ones, that would be totally wrong. Open; /archives//html/Towertalk/2007-08/msg00670.html (8,356 bytes)
20. Re: [TowerTalk] Rohn 45 Question (score: 1): Author: <john@kk9a.com>; Date: Sat, 25 Aug 2007 21:29:08 -0400; What do you call a large antenna? What does installing one without a crane have to do with multiple thrust bearings? I take it then that you have never experienced the installation of a large stacked; /archives//html/Towertalk/2007-08/msg00679.html (10,890 bytes)

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