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References: [ +from:jimjarvis@optonline.net: 284 ]

Total 284 documents matching your query.

241. Re: [TowerTalk] Engineering Help wanted (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Tue, 02 Jun 2009 11:59:47 -0400; Joe, First, good points were made by Dave, K6LL and Bill, W2AY. Namely, that Rohn spec's 2 s.f. load no more than 30' above a house bracket. You've overloaded the tower with the TH6. It's testimony t; /archives//html/Towertalk/2009-06/msg00031.html (8,369 bytes)
242. [TowerTalk] Yaesu G1000dxa alignment procedure (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Tue, 02 Jun 2009 14:30:47 -0400; The following procedure was just tested and verified, on my G1000dxa. This is probably more than you ever wanted to know--but it's worth having in the archive. PROCEDURE FOR ALIGNING A YAESU-MUSEN G1; /archives//html/Towertalk/2009-06/msg00042.html (12,268 bytes)
243. [TowerTalk] VHF beam spacing? (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Fri, 03 Jul 2009 15:30:03 -0400; Folks, I've got an M2 6m5x, 5 elements on six meters, which will mount on a pole-mounted rotor. (G1000dxa). I want to put a small 2m yagi above that. Does anyone have a sense of minimum spacing requi; /archives//html/Towertalk/2009-07/msg00018.html (7,251 bytes)
244. Re: [TowerTalk] and we wonder... (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Tue, 07 Jul 2009 07:38:24 -0400; 60' tower, with what appears to be an Antron 99 vertical on top. Not solidly guyed. NOT 25G, no diagonal bracing. The choice of antenna, tower, installation, and climbing safety equipment clearly ref; /archives//html/Towertalk/2009-07/msg00054.html (6,646 bytes)
245. Re: [TowerTalk] concrete set time (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Tue, 07 Jul 2009 13:59:34 -0400; The only time I did this, we had a structural engineer on the team. Before the concrete was poured, he did a "slump" test. Poured a cone of the stuff, and measured how much it deflected downward. Evi; /archives//html/Towertalk/2009-07/msg00076.html (9,172 bytes)
246. Re: [TowerTalk] concrete set time (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Tue, 07 Jul 2009 14:44:25 -0400; Yup. you're right. I went looking on wikipedia, with the thought that I could get to an ASTM table which might have dealt with slump vs. strength... struck out. and slumped at my desk, in defeat. Sor; /archives//html/Towertalk/2009-07/msg00082.html (11,051 bytes)
247. Re: [TowerTalk] scariest repairs (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Fri, 17 Jul 2009 13:09:57 -0400; Tall buildings aren't guyed structures, Bill. I wouldn't expect to see 1"/100' deflection in a guyed tower, unless the guys weren't properly tensioned. To follow your rule, you'd see 20"-40" side-swa; /archives//html/Towertalk/2009-07/msg00327.html (8,218 bytes)
248. [TowerTalk] 25g taper tops (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Fri, 17 Jul 2009 13:11:20 -0400; I've had 25g taper tops with 2" i.d. (approx) tubes, and with 1.75" i.d. As far as I knew, they were both from Rohn. Are we saying that Rohn only made 2" tube tops? n2ea _____________________________; /archives//html/Towertalk/2009-07/msg00328.html (7,051 bytes)
249. Re: [TowerTalk] scariest repairs (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Fri, 17 Jul 2009 16:03:05 -0400; As I said, privately, to Jim Lux's comment about deflection, and the paper given at Dayton... I thought you could MEASURE some small deflection, but perhaps not feel it. I was thinking of the catenar; /archives//html/Towertalk/2009-07/msg00348.html (8,526 bytes)
250. Re: [TowerTalk] scariest repairs (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Fri, 17 Jul 2009 16:45:32 -0400; The N7NV analysis is impressive. Tower deflection is attributed largely to guy stretch. I've been on top of 80' sailboat masts, which are intended to be flexible at their top... which don't flex more; /archives//html/Towertalk/2009-07/msg00352.html (8,631 bytes)
251. Re: [TowerTalk] Palmdale (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Sat, 18 Jul 2009 16:51:46 -0400; We need to ban this topic on this reflector. As others have observed, it is nothing but self-serving babble, NOT effective, focused response to what may be a credible threat. I would suspect that the; /archives//html/Towertalk/2009-07/msg00367.html (7,120 bytes)
252. Re: [TowerTalk] "Faraday shield for coax and control lines" (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Sun, 09 Aug 2009 15:37:06 -0400; Finally out of the closet, eh, Dave? I'd imagine the SPG discussions here may take on a somewhat tone, in the wake of your post. Jim/N2EA Note, I play the part of an amateur on here, but in real life; /archives//html/Towertalk/2009-08/msg00157.html (15,834 bytes)
253. [TowerTalk] forsale: 25g & accessories (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Sat, 29 Aug 2009 12:53:03 -0400; I have the following for sale, available in central NJ: 3 10' 25g 1 8' taper top (2") rotor shelf house bracket. $200 for the package, pickup only. G1000DXA rotor extra mast-mount to enable pole moun; /archives//html/Towertalk/2009-08/msg00560.html (7,084 bytes)
254. [TowerTalk] Reply reminder (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Mon, 07 Sep 2009 12:28:05 -0400; If you get the digest form of this reflector, please do NOT hit REPLY to a message. The result is that the entire digest is reposted, causing everyone to have to wade through the complete re-post. Tn; /archives//html/Towertalk/2009-09/msg00093.html (7,017 bytes)
255. Re: [TowerTalk] full wave loop height (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Fri, 25 Sep 2009 06:41:40 -0400; Previous comments about height, and operating frequency were all correct. HOWEVER.... when a loop operates in two wavelength mode, or above, it radiates in the plane of the wire, not perpendicular t; /archives//html/Towertalk/2009-09/msg00432.html (9,405 bytes)
256. Re: [TowerTalk] what happened to the R6 and r8 ? (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Mon, 05 Oct 2009 15:21:07 -0400; If you go to www.mfjenterprises.com, the home page has a link to http://www.cushcraftamateur.com/ And on THAT home page, a picture of the R8 is prominent. If you click on 'Catalog', on the left side; /archives//html/Towertalk/2009-10/msg00039.html (7,074 bytes)
257. Re: [TowerTalk] TL antenna (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Fri, 09 Oct 2009 15:15:35 -0400; Clint, I can't picture your physical environment, but I have a hard time seeing how this antenna would be less cumbersome than a simple 23' elevated vertical. Or, a vertical dipole. If you have a tre; /archives//html/Towertalk/2009-10/msg00050.html (7,662 bytes)
258. Re: [TowerTalk] tree strung dipoles (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Mon, 19 Oct 2009 11:16:20 -0400; I have 1/8" olive drab dacron line which I favor. For longer term installations, I also have some 1/4" o.d. dacron. Have used both with a low profile carolina windom here in NJ. I bought some 1/8" ke; /archives//html/Towertalk/2009-10/msg00290.html (8,381 bytes)
259. Re: [TowerTalk] tree strung dipoles (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Mon, 19 Oct 2009 12:16:07 -0400; For a period time, in VT, I had a tree service guy who was a ham come in, and he tied two pulley's in place for me. This was essentially free, while he was doing some other tree maintenance work. Unf; /archives//html/Towertalk/2009-10/msg00294.html (14,486 bytes)
260. Re: [TowerTalk] line for tree strung dipoles (score: 1): Author: jim Jarvis <jimjarvis@optonline.net>; Date: Mon, 19 Oct 2009 19:23:27 -0400; I use 1/4 inch dacron rope attached to bungee cords, with a "safety" rope around the bungee cord to make it fail-safe. Works fine here in the Colorado Rockies at 7500 feet, with TONS of sunshine and; /archives//html/Towertalk/2009-10/msg00313.html (7,581 bytes)

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