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41. [Towertalk] Lighting Protection and Roof Towers (score: 1): Author: RedHaines@centurytel.net (Red); Date: Thu, 12 Dec 2002 11:36:59 -0600; It sure is! As is the other side of the dipole. Some advocate an inductor between the two parts of a dipole to prevent static buildup between them and to facilitate designing a system to protect the; /archives//html/Towertalk/2002-12/msg00373.html (10,418 bytes)
42. [Towertalk] Lighting Protection and Roof Towers (score: 1): Author: RedHaines@centurytel.net (Red); Date: Thu, 12 Dec 2002 11:31:38 -0600; One more response: I still have a Hy Gain vertical that survived a direct hit. I looked out the window at the right moment and saw it (and heard it). The feedline from it was terminated outside the h; /archives//html/Towertalk/2002-12/msg00374.html (16,974 bytes)
43. [Towertalk] Antenna maintenance (score: 1): Author: RedHaines@centurytel.net (Red); Date: Mon, 16 Dec 2002 19:53:53 -0600; If ones antenna requirements are modest, and if one has sufficient clear space around the tower and antenna, it is not difficult to hinge a self supporting tower so it can be raised and lowered fairl; /archives//html/Towertalk/2002-12/msg00478.html (10,300 bytes)
44. [Towertalk] modeling help (score: 1): Author: RedHaines@centurytel.net (Red); Date: Tue, 17 Dec 2002 10:49:45 -0600; Hi, Steve; I recommend you take the ARRL Continuing Education course on antenna modeling. It will lead you through the process with assistance of a mentor to help you when you are stuck. Trying to st; /archives//html/Towertalk/2002-12/msg00494.html (8,395 bytes)
45. [Towertalk] Wind force calculations (score: 1): Author: RedHaines@centurytel.net (Red); Date: Wed, 18 Dec 2002 11:45:41 -0600; You really ask a tough question, because the answer is not really simple. Aerodynamic drag depends upon a parameter called the Reynolds Number, which is a function of dimension and velocity. Once the; /archives//html/Towertalk/2002-12/msg00532.html (8,888 bytes)
46. [Towertalk] Space Saver Dipoles (score: 1): Author: RedHaines@centurytel.net (Red); Date: Mon, 30 Dec 2002 14:49:50 -0600; Shortened antennas generally are most effective if the loads or matching networks used to match the shortened elements are designed and employed to minimize IR losses. A good approach to shortening a; /archives//html/Towertalk/2002-12/msg00787.html (12,000 bytes)
47. [Towertalk] Service drop danger (score: 1): Author: RedHaines@centurytel.net (Red); Date: Tue, 12 Nov 2002 10:31:47 -0600; Hi, David; I believe you are correct. Check the National Electrical Code, you can review it in your local library, and call the utility company for authoritative information. Don't depend completely; /archives//html/Towertalk/2002-11/msg00230.html (8,799 bytes)
48. [Towertalk] tower joint Conductivity ??? (score: 1): Author: RedHaines@centurytel.net (Red); Date: Tue, 19 Nov 2002 10:45:12 -0600; I certainly agree with Steve. It is difficult to assure conductivity of the tower unless it is bypassed with joint-free conductors, or welded together. Assuring high conductivity of the tower joints; /archives//html/Towertalk/2002-11/msg00482.html (11,532 bytes)
49. [Towertalk] Quads Yagis and contact static (score: 1): Author: RedHaines@centurytel.net (Red); Date: Thu, 21 Nov 2002 09:18:44 -0600; The lightning protection suppressers for feedlines from ICE dissipate static on each side of the suppresser, via an inductor on the antenna side and a resistor on the rig side. 73 de WO0W; /archives//html/Towertalk/2002-11/msg00591.html (7,408 bytes)
50. [Towertalk] Cleaning Aluminium (score: 1): Author: RedHaines@centurytel.net (Red); Date: Sat, 23 Nov 2002 08:30:06 -0600; I researched the issue of cleaning and polishing aluminum years ago when I owned an unpainted airplane. A recommendation from one of the manufacturing organizations worked best - least effort and ver; /archives//html/Towertalk/2002-11/msg00637.html (9,042 bytes)
51. [Towertalk] Cleaning Aluminium (score: 1): Author: RedHaines@centurytel.net (Red); Date: Sat, 23 Nov 2002 08:36:40 -0600; I've been cautioned against using steel wool on aluminum because bits of the steel imbed in the aluminum and corrode later. At one time, aluminum wool was available. Plastic aluminum scrubbing pads a; /archives//html/Towertalk/2002-11/msg00638.html (9,675 bytes)
52. [Towertalk] Power ground rod driver (score: 1): Author: RedHaines@centurytel.net (Red); Date: Thu, 28 Nov 2002 20:53:33 -0600; What Jim suggests is on the right track. Two improvements are: 1) spread the ground connections over a larger area, like spacing conventional ground rods at twice their depth, and 2) improve coupling; /archives//html/Towertalk/2002-11/msg00788.html (10,842 bytes)
53. [Towertalk] Burying ground rods horizontally (score: 1): Author: RedHaines@centurytel.net (Red); Date: Thu, 28 Nov 2002 21:05:23 -0600; Keep in mind that while grounding in accordance with the NEC provides safety with respect to the 60 Hz power; it does not provide either RF ground or the kind of lightning protection ground that hams; /archives//html/Towertalk/2002-11/msg00789.html (13,789 bytes)
54. [Towertalk] Rebar (score: 1): Author: RedHaines@centurytel.net (Red); Date: Thu, 03 Oct 2002 18:22:31 -0500; Hello to all; I'm preparing to build a rebar cage for a tower base. I wish to be sure it is the correct material for welding. None of the local suppliers of rebar recognizes the ASTM 706 specificatio; /archives//html/Towertalk/2002-10/msg00106.html (6,818 bytes)
55. [Towertalk] Rebar Cage (score: 1): Author: RedHaines@centurytel.net (Red); Date: Thu, 19 Sep 2002 14:49:35 -0500; It is better if rebar members are totally contained in the concrete, to eliminate paths where the natural alkilinity of the concrete may leach out, particularly at the bottom of the assembly. That al; /archives//html/Towertalk/2002-09/msg00667.html (9,500 bytes)
56. [Towertalk] Rebar Cage (score: 1): Author: RedHaines@centurytel.net (Red); Date: Thu, 19 Sep 2002 14:55:34 -0500; In addition, welding all joints helps the rebar distribute lightning discharges through the concrete, making your base a "Ufer" ground, named after the investigator who established its value. The wel; /archives//html/Towertalk/2002-09/msg00670.html (11,263 bytes)
57. [Towertalk] Grounding the mast (score: 1): Author: RedHaines@centurytel.net (Red); Date: Thu, 08 Aug 2002 08:24:23 -0500; Typical installations place a mast above the tower, mounted to a rotator and in a bearing at the top of the tower. These connections to the tower are through bearings, which puts the bearings at some; /archives//html/Towertalk/2002-08/msg00242.html (7,097 bytes)
58. [Towertalk] Newbie Question (score: 1): Author: RedHaines@centurytel.net (Red); Date: Thu, 18 Jul 2002 12:44:34 -0500; Troy; Normally I'd agree that heliax is overkill on HF, but suggest you check the attenuation of any coax, expecially on 10 and 15 meter. Ordinary RG-8 loses about 1.2-1.3 dB per 100 feet at 30 MHz.; /archives//html/Towertalk/2002-07/msg00487.html (7,797 bytes)
59. [Towertalk] Ground wire impedance (score: 1): Author: RedHaines@centurytel.net (Red); Date: Tue, 30 Jul 2002 08:41:09 -0500; An effective substitute for flashing or other wide conductors is parallel wires. For example, I ground my SPGP with 5 No. 6 copper wires spaced across 10 inches (2 1/4" between adjacent wires). This; /archives//html/Towertalk/2002-07/msg00816.html (11,125 bytes)
60. [Towertalk] Lightning (score: 1): Author: RedHaines@centurytel.net (Red); Date: Wed, 15 May 2002 17:10:15 -0500; Hi, Talkers; Some references follow for those who wish to study the subject more. Add to the list Polyphaser's book, 'The Grounds.' Industrial Communication Engineers, LTD (I.C.E.) of Indianapolis, I; /archives//html/Towertalk/2002-05/msg00403.html (8,415 bytes)

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