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41. [TowerTalk] Disconnecting cables and lightning (questions -- (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Mon, 8 Jun 1998 11:34:30 -0400; Yeah, this is what every tower-owner needs, a set of rockets which fires off into a thunderstorm in order to draw lightning strikes away from the tower.... Seems like putting in a full PolyPhaser ins; /archives//html/Towertalk/1998-06/msg00226.html (9,256 bytes)
42. [TowerTalk] Peripheral ground system (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Thu, 11 Jun 1998 16:36:47 -0400; I don't believe for a second that any county in the Atlanta area has a descernable frost line.... Of course, for a water line, you don't want it freezing AT ALL. But you're not going to see much, if; /archives//html/Towertalk/1998-06/msg00364.html (9,191 bytes)
43. [TowerTalk] Cushcraft R7000 and MFJ-1796, MFJ-1798 verticles (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Thu, 7 May 1998 09:25:15 -0400; I own an R7000. Right now, since I don't have a tower and my beam is on loan to a fellow ham, it is my primary antenna. According to Art at Cushcraft, the R7000 was designed to be mounted about 18 fe; /archives//html/Towertalk/1998-05/msg00260.html (10,553 bytes)
44. [TowerTalk] Painting a new mast? (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Fri, 3 Apr 1998 10:51:14 -0500; I hope it isn't too late to add to this discussion. A bit of information from the field of aviation: Historically, light aircraft airframes of the "tube and fabric" design are built with chrome-moly; /archives//html/Towertalk/1998-04/msg00073.html (8,417 bytes)
45. [TowerTalk] Expanding Foam (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Tue, 2 Dec 97 16:22:04 -0500; First, I use a 12 inch piece of 4 inch PVC with a 90 degree elbow for my cable egress. Hard part was drilling the hole through the wall. As for filling the space between the cables and the PVC, I hav; /archives//html/Towertalk/1997-12/msg00045.html (7,910 bytes)
46. [TowerTalk] Simple Dipoles (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Wed, 10 Dec 97 17:20:34 -0500; Use RG-174/U as the feedline. It should improve your bandwidth. (<grin>) I'd be interested to hear your reasons why you hate using a tuner. I don't see any clear solution offhand other than those you; /archives//html/Towertalk/1997-12/msg00207.html (8,852 bytes)
47. [TowerTalk] Tuned Feeders (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Wed, 1 Oct 97 16:01:22 -0400; How do you keep the wire in the slot? What's to prevent the wire from just popping out? How often do you put a spacer? What kind of wire? Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@radio.org Quote: "No; /archives//html/Towertalk/1997-10/msg00027.html (7,526 bytes)
48. [TowerTalk] Tuned feeders. (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Tue, 7 Oct 97 13:31:41 -0400; Is the tuner in a sheilded box? It might help. But if the tuner isn't sheilded, probably not much. You might consider what I do, with a very similar antenna. I run coax from the tuner to the outside; /archives//html/Towertalk/1997-10/msg00189.html (8,304 bytes)
49. [TowerTalk] Chrome moly/end caps (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Mon, 27 Oct 97 16:17:43 -0500; But, typically, we don't use high-strength temper treated 4130. That's what he's discussing. This is done to releave the internal stresses that might have formed in the process of cooling after each; /archives//html/Towertalk/1997-10/msg00724.html (8,840 bytes)
50. [TowerTalk] Re: Amidon FB-43-1020 beads. (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Mon, 27 Oct 97 17:28:19 -0500; You know, was musing about this problem just the other day. (I have too long a commute....) It seems unfair that the first bead or two in a bead balun are doing all the "work." It also produces a fai; /archives//html/Towertalk/1997-10/msg00727.html (9,351 bytes)
51. [TowerTalk] More information about cleaning aluminum (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Fri, 5 Sep 97 13:39:12 -0400; Here's a bit of cross-disciplinary wisdom: -- I ran across a brief note in the July 1997 edition of Sport Aviation, the magazine sent to all Experimental Aircraft Association (EAA) members. The note; /archives//html/Towertalk/1997-09/msg00133.html (7,960 bytes)
52. [TowerTalk] Building Code Units of Measure (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Thu, 11 Sep 97 12:28:42 -0400; Depends on a number of factors. In the aviation world, where weight is much more important than the tower world, design factors of 1.5 over ultimate design load seem to be standard for metal designs.; /archives//html/Towertalk/1997-09/msg00284.html (9,333 bytes)
53. [TowerTalk] Nylock Nuts (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Fri, 12 Sep 97 22:35:12 -0400; I've never seen one flat on both sides, but I'd still recommend installing it with the nylon part AWAY from the union. The reason is simple. If you look at the stresses on a bolt/nut joint, nearly al; /archives//html/Towertalk/1997-09/msg00324.html (8,004 bytes)
54. [TowerTalk] Driving ground rods (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Tue, 16 Sep 97 09:29:33 -0400; I built a manual ground rod driver. It consists of 12" of 1" galvanized steel nipple (thick wall water pipe with threads at both ends), a couple of pipe couplers, a pipe cap (goes inside the coupler; /archives//html/Towertalk/1997-09/msg00414.html (9,365 bytes)
55. [TowerTalk] trees as guy anchors (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Tue, 23 Sep 97 12:27:56 -0400; Poly rope? That stuff that degrades in sunlight? After 1 summer season, it has probably lost the majority of its strength. Nylon rope is much more UV resistant, but it will lose strength, too. Dacron; /archives//html/Towertalk/1997-09/msg00610.html (9,557 bytes)
56. [TowerTalk] Feedline choke for A3 beam (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Fri, 26 Sep 97 17:25:24 -0400; Nah, it isn't that heavy, and doesn't add appreciably to the wind load. When I had my A3 up, I taped the coil to in the "corner" between the boom and the mast. It stayed up there over six years, and; /archives//html/Towertalk/1997-09/msg00692.html (9,412 bytes)
57. [TowerTalk] Separating Aluminum Tower Sections (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Tue, 30 Sep 97 15:38:32 -0400; I had problems separating the aluminum tubing of my A3S boom. It was incorrectly assembled WITHOUT NoAlox or other anti-corrossion compound. (I've since learned better) Best advice I got was to use H; /archives//html/Towertalk/1997-09/msg00799.html (8,259 bytes)
58. [TowerTalk] Tuned Feeders (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Tue, 30 Sep 97 15:52:09 -0400; All that foam dielectrc introduces loss, which is exactly what you don't want when using tuned feeders. So, instead of the 300 ohm ribbon, try finding some 450 ohm ladder line instead. This has insul; /archives//html/Towertalk/1997-09/msg00800.html (8,529 bytes)
59. [TowerTalk] Computer RFI (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Tue, 5 Aug 97 10:26:21 -0400; I have a WYSE 85 terminal that caused similar trouble. (Ironically, the 85 is a VT220 clone -- perhaps in more ways than one) I discovered that a goodly portion of the RFI from the WYSE was from the; /archives//html/Towertalk/1997-08/msg00167.html (7,952 bytes)
60. [TowerTalk] Identify Rotator?? (score: 1): Author: aa4lr@radio.org (Bill Coleman AA4LR); Date: Thu, 7 Aug 97 17:37:25 -0400; This is a CDE AR series rotator. It should allow almost 400 degrees of rotation. It runs on like 30 volts AC. The contact points trip about every 6 degrees that move a mechcanical pointer in the cont; /archives//html/Towertalk/1997-08/msg00278.html (8,680 bytes)

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