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141. [TowerTalk] fall arresting equipment for roofs (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Mon, 7 May 2001 11:09:38 -0400; In addition to Steve's excellent information, I'll point out that a full fall arrest harness doesn't cost much -- Champion Radio has them for less than $100. Not a steep price where your safety is co; /archives//html/Towertalk/2001-05/msg00204.html (9,178 bytes)
142. [TowerTalk] Ham4 (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Mon, 7 May 2001 11:34:54 -0400; The Ham-M control box has a metal chassis, but the outer case is plastic. Perhaps you're thinking of the Ham-II control box, which is more like a box, whereas the Ham-M was barely bigger than the met; /archives//html/Towertalk/2001-05/msg00205.html (7,590 bytes)
143. [TowerTalk] Question about Mast Yield Strength (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Mon, 7 May 2001 15:37:01 -0400; I understood that the yeild strength is a fundamental property of the material. Making it thicker doesn't increase the yeild strength, although it does give more area for the forces to work themselve; /archives//html/Towertalk/2001-05/msg00208.html (8,660 bytes)
144. [TowerTalk] Tilting up Rohn 25. (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Mon, 7 May 2001 17:24:15 -0400; It takes a REALLY STRONG wench to pull that up.... Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wright, 1901 List Sponsor: Champ; /archives//html/Towertalk/2001-05/msg00213.html (7,359 bytes)
145. [TowerTalk] 4130? Maybe - maybe not. (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Wed, 9 May 2001 17:30:23 -0400; It has to be galvanized, powder-coated or painted, just like 4130. FWIW, many early aircraft (eg 1930's) were built of 102x carbon steel tubing. 4130 is probably eaiser to find and less expensive tha; /archives//html/Towertalk/2001-05/msg00232.html (7,797 bytes)
146. [TowerTalk] Grips vs. clamps? (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Tue, 3 Apr 2001 12:20:45 -0400; On 3/29/01 7:40 PM, Stan or Patricia Griffiths at w7ni@easystreet.com wrote: Nicopress fittings are used commonly on aircraft. Your local EAA chapter may have a crimper in its cache of tools. Nicropr; /archives//html/Towertalk/2001-04/msg00059.html (7,059 bytes)
147. [TowerTalk] More input (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Tue, 3 Apr 2001 13:36:37 -0400; I'm a teeny bit unclear on how our F12 product unassembled itself. Did the elements come out whole, or were they cracked where they were riveted, or did the elements fail at some point other than the; /archives//html/Towertalk/2001-04/msg00062.html (8,460 bytes)
148. [TowerTalk] Coax Rating (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Thu, 1 Mar 2001 18:09:33 -0500; All the RG-8X I've ever bought has a braid, very similar to RG-58/RG-59. The issue is probably more of having a proper match to the feedline. If you are feed a purely resistive 50 ohm load, RG-58 or; /archives//html/Towertalk/2001-03/msg00039.html (9,848 bytes)
149. [TowerTalk] Recent Cushcraft discussion. (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Fri, 2 Mar 2001 09:14:53 -0500; They certainly didn't give ME that kind of treatment with MY R7000. Not only did Cushcraft Technical Support make it abundantly clear they had absolutely no interest in helping me diagnose why my R70; /archives//html/Towertalk/2001-03/msg00053.html (7,887 bytes)
150. [TowerTalk] F-12 C3S assembly hints? (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Fri, 2 Mar 2001 09:14:52 -0500; This is really excellent advice. I haven't built a Force12 antenna, but I've pulled hundreds of blind rivets. When building aircraft with these fasteners, we use a device called a Cleco -- after the; /archives//html/Towertalk/2001-03/msg00055.html (7,921 bytes)
151. [TowerTalk] Advise Please (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Fri, 9 Mar 2001 09:31:19 -0500; I beg to differ! People have built aircraft for decades using much thinner tubing thicknesses than Rohn 25 or 45 have. Naturally, thin-walled tubing is a bit more challenging to weld, but the tubing; /archives//html/Towertalk/2001-03/msg00166.html (8,235 bytes)
152. [TowerTalk] Re: Digging Holes (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Thu, 22 Mar 2001 14:37:18 -0500; Hey! It's the LXC prime directive, no? Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wright, 1901 -- FAQ on WWW: http://www.conte; /archives//html/Towertalk/2001-03/msg00454.html (8,684 bytes)
153. [TowerTalk] benefits to 7 additional ft of height? (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Wed, 21 Feb 2001 09:17:30 -0500; How high is the bracket? Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wright, 1901 -- FAQ on WWW: http://www.contesting.com/FAQ/; /archives//html/Towertalk/2001-02/msg00371.html (7,468 bytes)
154. [TowerTalk] Tower Failures (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Thu, 22 Feb 2001 14:21:56 -0500; Bob, I don't have an specific studies, but I've also seen the 40% figure bandied around for guyed towers. It does make sense. Even if a top guy fails, the remaining guys limit how the tower can come; /archives//html/Towertalk/2001-02/msg00403.html (8,643 bytes)
155. [TowerTalk] Re: Radials over salt water (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Thu, 11 Jan 2001 10:39:30 -0500; Hmm. 1/4 wave radials means a circle of 1/2 diameter. That's a perimeter of pi/2 wavelength, which divided by .05 yeilds about 31 radials. Similarly, .025 spacing at the ends is about 63 radials. If; /archives//html/Towertalk/2001-01/msg00276.html (9,552 bytes)
156. [TowerTalk] Re: Radials over salt water (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Thu, 11 Jan 2001 16:16:53 -0500; Hmm. 0.4 * 2 * pi / 0.025 = about a 100, not 120. If you keep the 0.025 wavelength spacing at the perimeter, you have to go out to nearly 0.5 wavelength radials to require 120 radials. For 1/4 wave r; /archives//html/Towertalk/2001-01/msg00287.html (10,186 bytes)
157. [TowerTalk] Information on the Cushcraft R5? (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Thu, 11 Jan 2001 17:35:46 -0500; Just about all these questions can be answered by studying the R5 manual. See <http://www.cushcraft.com/support/pdf/r5.pdf>, and open in Adobe Acrobat. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.n; /archives//html/Towertalk/2001-01/msg00289.html (7,737 bytes)
158. [TowerTalk] Re: Radials over salt water (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Thu, 11 Jan 2001 16:50:52 -0500; That's NOT what Tom said. He was saying that radial spacing closer than about 0.025 wavelength is virtually indistinguishable from a solid sheet of metal. That doesn't meant that short radials can so; /archives//html/Towertalk/2001-01/msg00290.html (12,753 bytes)
159. [TowerTalk] FCC Requirements (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Mon, 15 Jan 2001 11:26:16 -0500; So maybe this is the rule of thumb: lay down radials until you run out of wire. <grin> Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years will man ever fly!" -- Wil; /archives//html/Towertalk/2001-01/msg00364.html (7,291 bytes)
160. [TowerTalk] Tower concerns (score: 1): Author: aa4lr@arrl.net (Bill Coleman); Date: Mon, 15 Jan 2001 12:52:24 -0500; The important question is -- what sort of forces will be present at the bracket? Is your bracket mounting (or for that matter, your structure) strong enough to hold at the predicted forces? It could; /archives//html/Towertalk/2001-01/msg00365.html (14,447 bytes)

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