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141. Re: [TowerTalk] Tower Base In Concrete (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Sat, 24 Apr 2010 11:13:18 -0400
The Rohn drawing shows the Rohn 45 sticking 2 inches into the bed of drainage gravel. If you are burying a tower section then the Rohn drawing doesn't require a rebar cage as the buried section of th
/archives//html/Towertalk/2010-04/msg00745.html (9,014 bytes)

142. Re: [TowerTalk] Spanish-language conversation on baluns, antennas (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Mon, 26 Apr 2010 16:27:10 -0400
There was a case several years ago where an op was running a phone patch and the conversation switched from English to some other language. The op allowed the call to go on. It later turned out that
/archives//html/Towertalk/2010-04/msg00846.html (12,101 bytes)

143. Re: [TowerTalk] Overposting (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Tue, 27 Apr 2010 10:59:04 -0400
I found the digest difficult to work with. Now I have all towertalk messages go straight into it's own Inbox folder. I find that much easier to read and/or delete Mark _______________________________
/archives//html/Towertalk/2010-04/msg00895.html (7,813 bytes)

144. Re: [TowerTalk] Digging holes for anchor rods (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Wed, 28 Apr 2010 09:20:01 -0400
Is it important that the guy anchors are out at the same distance?. For instance on a 100 foot tower. 45G Rohn says 80% which is 80 feet. If one guy anchor point is at 108 feet, one is at 97 feet and
/archives//html/Towertalk/2010-04/msg00922.html (14,286 bytes)

145. [TowerTalk] Rohn 45 Tower Bolts Torque Setting (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Thu, 29 Apr 2010 10:59:09 -0400
I started to bolt some of my Rohn 45 together. Is there a torque setting for the tower leg bolts anywhere. How tight should they be? 73 Mark N1UK _______________________________________________ _____
/archives//html/Towertalk/2010-04/msg00968.html (9,300 bytes)

146. Re: [TowerTalk] Rohn 45 Tower Bolts Torque Setting (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Fri, 30 Apr 2010 15:58:53 -0400
The thing was that on Rohn 25 you get nowhere near the limits of the bolt before the tubing of the tower starts to crush. A small amount of crush is required without causing the tower leg to become p
/archives//html/Towertalk/2010-04/msg00994.html (11,812 bytes)

147. Re: [TowerTalk] 2"OD tubing inside a Rohn 25AG2 (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Sat, 1 May 2010 16:04:22 -0400
I would just get another section of tower and put a shorter steel tube up there. I had a similar arrangement with my CL-33. The steel pipe will wear better I think. I would be concerned about the sof
/archives//html/Towertalk/2010-05/msg00018.html (8,939 bytes)

148. Re: [TowerTalk] 2"OD tubing inside a Rohn 25AG2 (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Sun, 2 May 2010 15:47:46 -0400
. Here is his original post quote" I have 3 sections of 25G, the top being a 25AG2. I would like to use a 12' piece of 2" OD .25" wall 6061-T6 aluminum tubing to get a total height of around 40'. The
/archives//html/Towertalk/2010-05/msg00034.html (9,761 bytes)

149. [TowerTalk] Sloping Tower Base (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Mon, 3 May 2010 20:48:19 -0400
I am getting ready to pour the base for my Rohn 45 with a buried section. Is there any reason why I can't put a slope on the top of the base to make sure that water drains away from the tower legs qu
/archives//html/Towertalk/2010-05/msg00072.html (8,059 bytes)

150. Re: [TowerTalk] Rohn 45 bracketed (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Tue, 4 May 2010 22:41:56 -0400
I am in the middle of installing a bracketed Rohn 45 with the bracket at 18 feet on the side of my house. Mark N1UK I plan to install one (45G) this summer bracketing it at 18' to my shop. I too woul
/archives//html/Towertalk/2010-05/msg00111.html (8,855 bytes)

151. Re: [TowerTalk] Guy Anchors in Concrete Pad Question (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Wed, 5 May 2010 17:47:07 -0400
It is probably only about 4 inches thick or less....I can't imagine that it would provide the strength that you are looking for unless it was laid with mesh or rebar. Unlikely since most people are p
/archives//html/Towertalk/2010-05/msg00135.html (8,498 bytes)

152. Re: [TowerTalk] Broken masts (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Thu, 6 May 2010 10:50:56 -0400
I notice that Texas Towers carries a line of steel masts. A friend recommended the 20 foot steel 0.25 mast. He said that if I nested about 7 feet or so in the tower and kept the rotor lower it would
/archives//html/Towertalk/2010-05/msg00151.html (8,343 bytes)

153. [TowerTalk] Orion 2800 (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Thu, 6 May 2010 12:08:54 -0400
Will the Orion 2800 rotator fit through the side rails of the Rohn 45 or do you need to cut/bend the rails. If it doesn't I might get the top base plate BPL45G and fit it to a standard section 10 foo
/archives//html/Towertalk/2010-05/msg00153.html (7,173 bytes)

154. [TowerTalk] Tower Base Concrete Cure Time (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Fri, 7 May 2010 12:53:49 -0400
I poured the base for my Rohn 45 this morning. This tower is held upright with a wall bracket at 18 feet. How long should I leave the concrete to cure before starting work to add the next sections? 7
/archives//html/Towertalk/2010-05/msg00181.html (8,049 bytes)

155. [TowerTalk] Grounding System (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Sat, 8 May 2010 20:36:27 -0400
I am getting ready to install the grounding system on my tower. I imagine that I will be using Cadweld /ThermoWeld. I wonder if it wil be cost effective to use the single shot system rather than buyi
/archives//html/Towertalk/2010-05/msg00206.html (7,551 bytes)

156. Re: [TowerTalk] Odd radial field question (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Tue, 11 May 2010 12:05:34 -0400
Yes I think that sounds like a great idea. I would look at brazing or cadwelding the connections between the expansion joints. Join them in several places so if one joint fails you will still be OK.
/archives//html/Towertalk/2010-05/msg00230.html (8,883 bytes)

157. [TowerTalk] Optimium Tower Height (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Wed, 19 May 2010 19:59:07 -0400
I have started my Rohn 45 tower projhect. I am planning to put a Cushcraft A3WS and a TH7DX atop this tower. I was planning on erecting a 100 foot tower but a fellow ham suggested that that might be
/archives//html/Towertalk/2010-05/msg00403.html (7,541 bytes)

158. Re: [TowerTalk] Optimium Tower Height (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Sun, 23 May 2010 11:34:20 -0400
Thank you for all the good input. Here is a bit of additional information on my plans. Initially I was considering a 40m yagi but the wind loads scared me off , so now I am planning on putting a 40m
/archives//html/Towertalk/2010-05/msg00554.html (12,554 bytes)

159. [TowerTalk] ROHN 25G Tower TUF TUG Climbing Safety Cable System R-TT10025 for a 45G Tower (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Sun, 23 May 2010 16:48:46 -0400
I am thinking of installing a tower climbing safety cable system on my Rohn 45 tower. Can anyone recommend a system for the Rohn 45. Will the Rohn R-TT10025 system fit a 45 tower. I see that the spec
/archives//html/Towertalk/2010-05/msg00558.html (8,929 bytes)

160. [TowerTalk] Guy Anchor (score: 1)
Author: "Mark Robinson" <markrob@mindspring.com>
Date: Mon, 24 May 2010 10:26:55 -0400
I am looking at the guy anchors for my Rohn 45 tower. The Rohn catlaog calls out an AB2 hole which is a 6 foot long by 4 foot by 4 foot hole. The Rebar cage is made up from 10 #6 rebar rods held toge
/archives//html/Towertalk/2010-05/msg00569.html (10,514 bytes)


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