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381. Re: [TowerTalk] Rohn 45 Bracketed Tower (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Tue, 3 Apr 2007 22:52:18 -0400; I would not go much over 40 feet as the TH 11 is a big antenna. The 46 feet of tower is the total you can go if my 1982 Rohn book is correct without an antenna. You need to properly guy the tower per; /archives//html/Towertalk/2007-04/msg00092.html (8,656 bytes)
382. Re: [TowerTalk] Utility Poles (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Sat, 28 Apr 2007 10:34:45 -0400; There are two ways to climb a utility pole. Either you have steps installed before you put it up or you use clinbing spikes. Alternatives are some type of track or a lift. Utility companies usually h; /archives//html/Towertalk/2007-04/msg00585.html (8,365 bytes)
383. Re: [TowerTalk] elevated radials vertical (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Sat, 9 Jun 2007 17:27:23 -0400; Sounds like the good old ground plane covered in most Antenna literature. Most ground planes have 4 quarter wave radials either horizontal or sloping away from the antenna base. Dave K4JRB __________; /archives//html/Towertalk/2007-06/msg00173.html (9,368 bytes)
384. [TowerTalk] Gotham vertical (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Mon, 9 Jul 2007 16:59:32 -0400; Several companies made that type of verticals where you had a 18 foot piece of aluminum with a coil (usually 3" B&W stock) with a clip to attached it at the place denoted in the manual for 80 to 10 (; /archives//html/Towertalk/2007-07/msg00408.html (8,095 bytes)
385. Re: [TowerTalk] Gotham antennas (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Tue, 10 Jul 2007 16:54:37 -0400; I was going to buy a Gotham beam in 1958 but my two Elmers W5KC and W5KHB talked me out of it and instead I got the 3 element Gonset Tri-Bander on an 18 foot boom. With this antenna on a 50 foot tele; /archives//html/Towertalk/2007-07/msg00447.html (9,315 bytes)
386. Re: [TowerTalk] Gotham antennas (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Thu, 12 Jul 2007 19:32:02 -0400; Yep, The Hornet line from Oklahoma was nought by Swan and they changed the numbers to TB-2 TB-3, TB-4H based on the number of elements. A fairly good antenna line but with one fault...they used 8 fo; /archives//html/Towertalk/2007-07/msg00548.html (9,398 bytes)
387. Re: [TowerTalk] Carolina Windom, etc. (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Sun, 9 Sep 2007 16:41:36 -0400; I use the Short Carolina 80 version of the carolina windom. This is a better version for DX (broadside) and within 1200 miles omni. This antenna was originally called the Carolina beam and Radio Work; /archives//html/Towertalk/2007-09/msg00293.html (9,442 bytes)
388. Re: [TowerTalk] re Wooden poles (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Thu, 4 Oct 2007 23:24:03 -0400; I had a wooden power pole that Mississippi Power gave me and even dug the hole and planted it for me. I got a set of steps installed before they put it in the ground. You might check with your local; /archives//html/Towertalk/2007-10/msg00120.html (8,369 bytes)
389. Re: [TowerTalk] Wooden poles (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Fri, 5 Oct 2007 16:17:23 -0400; Mike, The W5HVV quad weighed in at 140 pounds with all that metal angle iron. I lost it 2 years later in a tornado. Never did find even a trace of it. Antenna Mart of GA sold the same design as the s; /archives//html/Towertalk/2007-10/msg00137.html (8,517 bytes)
390. Re: [TowerTalk] Phasing Muli-Band Verticals (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Wed, 17 Oct 2007 13:36:43 -0400; I know Hy-Gain used to publish a piece on phasing their multi band verticles such as the Hy-tower but beware. You need to set phasing for the band you want the most (say 40) and you will get diminish; /archives//html/Towertalk/2007-10/msg00368.html (7,870 bytes)
391. Re: [TowerTalk] ground conductivity chart (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Mon, 22 Oct 2007 16:38:47 -0400; The ground conductivity chart Ken KG0WX has for download is also in the ARRL antenna book. Ken's is easier to read tho. Atlanta sits on top of Stone Mountain granite and has a value of 1. My little c; /archives//html/Towertalk/2007-10/msg00549.html (10,159 bytes)
392. Re: [TowerTalk] SteppIR vs. th7 stack (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Fri, 7 Mar 2008 17:42:56 -0500; There is probably not enough difference to tell. With the tri-banders (TH-7 or KT-34/36XA) you are limited to 10, 15, and 20 so if you want 12 and 17 stay with the SteppIR. There is a ham near Atlant; /archives//html/Towertalk/2008-03/msg00106.html (7,552 bytes)
393. Re: [TowerTalk] Pole steps (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Tue, 18 Mar 2008 17:02:05 -0500; I used pole steps for a number of years but mine were galvanized and quite sturdy. However, they were hard to climb at the specified distance between steps (the instructions told you to swing your le; /archives//html/Towertalk/2008-03/msg00347.html (8,876 bytes)
394. Re: [TowerTalk] Tower Base J (Anchor) Bolts (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Fri, 28 Mar 2008 08:41:41 -0500; I have moved my 71 foot crank up 4 times since purchase. I use 1" galvanized bolts (threaded) from most big hardware stores. I notice now that they will need to order them. I don't remember the lengt; /archives//html/Towertalk/2008-03/msg00505.html (8,492 bytes)
395. Re: [TowerTalk] worlds biggest yagi (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Sat, 29 Mar 2008 14:23:02 -0500; More big yagi's... WA6ZZK 20 meter long boom (100 foot. K4SKI had a 9 el 20 on a 100 foot boom in the early 70's. The boom was made from Rohn 25. Dunc Carter then W5IOU made several very long boom 8; /archives//html/Towertalk/2008-03/msg00573.html (9,851 bytes)
396. Re: [TowerTalk] Vertical plans (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Sun, 6 Apr 2008 22:06:01 -0400; Iagree with Bill Jackson. It would be great to have a four square on 75 and even better to have a dipole four square as in the W9LT/K8UR config as AA4MM does. I have two dipole verticals (the old Mor; /archives//html/Towertalk/2008-04/msg00126.html (10,348 bytes)
397. Re: [TowerTalk] Highway light poles (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Fri, 18 Apr 2008 13:14:54 -0400; Most of the new highway light poles (at least around Atlanta) are what a GA Power Engineer calls composite poles. These are a combination of concrete and a metal. They are not crank up but come in 40; /archives//html/Towertalk/2008-04/msg00461.html (9,978 bytes)
398. Re: [TowerTalk] A3 40 meter add-on (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Wed, 14 May 2008 12:51:52 -0400; Those 40 meter add on kits require the original beam for the rest of the the element. However, there is no reason you can not design an add on kit for the 20 meter beam. Start with just the driven el; /archives//html/Towertalk/2008-05/msg00263.html (8,618 bytes)
399. Re: [TowerTalk] 6 meter antennas ? (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Sat, 21 Jun 2008 23:49:55 -0400; I know most of the big multi ops run omni antennas on 6 such as the M2 loop or the KU4AB loop but then switch to their beam (or beams) when you call. The beam is several S points higher than the loop; /archives//html/Towertalk/2008-06/msg00440.html (8,086 bytes)
400. Re: [TowerTalk] 160/80m Inverted L dualband design (score: 1): Author: "David Thompson" <thompson@mindspring.com>; Date: Thu, 3 Jul 2008 12:09:41 -0400; W9INN had a good design that used a trap and was only 115 feet long (full size on 80). I had it up and for a short time before a storm took it down. With just a ground rod and two radials I did very; /archives//html/Towertalk/2008-07/msg00074.html (9,215 bytes)

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