Mail Archive Search: <+from:w8ji.tom@MCIONE.com>

Results:

References: [ +from:w8ji.tom@MCIONE.com: 321 ]

Total 321 documents matching your query.

181. [TowerTalk] ALL THE RIGHT ANGLES ? (score: 1): Author: w8ji.tom@MCIONE.com (w8ji.tom); Date: Tue, 11 Aug 1998 16:00:34 -0400; Hi Pete, I recall reading in early text angles were measured, not modeled. The measurements were with low height ~70 ft antennas. under be stronger. That is certainly the point everyone should agree; /archives//html/Towertalk/1998-08/msg00306.html (8,796 bytes)
182. [TowerTalk] cross booms for vhf/uhf antennas (score: 1): Author: w8ji.tom@MCIONE.com (w8ji.tom); Date: Tue, 18 Aug 1998 11:28:35 -0400; One thing I notice is, when using a fiberglass or non-metallic crossboom, the installer often runs the coaxial feedline right along the crossboom. The feedline (when routed along the fiberglass cross; /archives//html/Towertalk/1998-08/msg00525.html (7,845 bytes)
183. [TowerTalk] 80m antenna (score: 1): Author: w8ji.tom@MCIONE.com (w8ji.tom); Date: Fri, 21 Aug 1998 11:47:21 -0400; Hi Steve and all, vee has (scientific Folding the legs down mainly changes efficiency by decreasing feedpoint impedance and lowering the effective height of the antenna. If we "vee" the antenna enoug; /archives//html/Towertalk/1998-08/msg00636.html (9,432 bytes)
184. [TowerTalk] Flat top vs Inv Vee (score: 1): Author: w8ji.tom@MCIONE.com (w8ji.tom); Date: Sat, 22 Aug 1998 03:07:32 -0400; Hi Bill, The first line I wrote in my earlier reply was: "Folding the legs down mainly changes efficiency by decreasing feedpoint impedance and lowering the effective height of the antenna." I think; /archives//html/Towertalk/1998-08/msg00662.html (10,471 bytes)
185. [TowerTalk] Flat top vs Inv Vee (score: 1): Author: w8ji.tom@MCIONE.com (w8ji.tom); Date: Sat, 22 Aug 1998 09:44:03 -0400; Hi Dennis, of the Different I don't know what quantity "startling" is. Perhaps the problem is my fault, because I call a change "insignificant" while others correctly define the very same change as "; /archives//html/Towertalk/1998-08/msg00669.html (11,125 bytes)
186. [TowerTalk] Flat top vs Inv Vee (score: 1): Author: w8ji.tom@MCIONE.com (w8ji.tom); Date: Sun, 23 Aug 1998 10:41:08 -0400; I looked at results in a paper published by Jack Belrose comparing full blown NEC-2 to actual full pattern measurements by Haagn and Barker over 30 mS/m soil, and the error was about 5 dB at .05 wl h; /archives//html/Towertalk/1998-08/msg00719.html (9,671 bytes)
187. [TowerTalk] Shunt Fed Towers (score: 1): Author: w8ji.tom@MCIONE.com (w8ji.tom); Date: Mon, 24 Aug 1998 08:50:56 -0400; Hi Jim and all, The efficiency of a conical monopole and a shunt or series fed tower are identical except for a very slight reduction in resistive losses in the antenna conductors. Those losses are,; /archives//html/Towertalk/1998-08/msg00753.html (7,781 bytes)
188. [TowerTalk] Mismatch loss and tuners (score: 1): Author: w8ji.tom@MCIONE.com (w8ji.tom); Date: Mon, 24 Aug 1998 09:24:09 -0400; Hi Eric, Of course this also includes using a UNbalanced line to feed a less-than-perfectly-UNbalanced antenna. For example, a coaxial line feeding a conventional four radial groundplane will radiate; /archives//html/Towertalk/1998-08/msg00754.html (11,388 bytes)
189. [TowerTalk] Mismatch Loss and Tuners (score: 1): Author: w8ji.tom@MCIONE.com (w8ji.tom); Date: Mon, 24 Aug 1998 23:14:42 -0400; Hi Steve, "reflection 1.) Assuming "significant" is a noticeable amount, that summary is incorrect. It ignores transmission line loss between the tuner and antenna. Matched line loss MUST be included; /archives//html/Towertalk/1998-08/msg00793.html (9,438 bytes)
190. [TowerTalk] Cage Antenna Construction Hints? (score: 1): Author: w8ji.tom@MCIONE.com (w8ji.tom); Date: Thu, 27 Aug 1998 09:43:28 -0400; Hi Paul, I don't understand why there is a minimum diameter Paul. A number 16 wire has more bandwidth than a number 20, and a number 8 more than a number 16. A six inch diameter cage will be broader; /archives//html/Towertalk/1998-08/msg00914.html (9,074 bytes)
191. [TowerTalk] Re: ATR-30 and Palstar tuner (score: 1): Author: w8ji.tom@MCIONE.com (w8ji.tom); Date: Thu, 27 Aug 1998 12:18:01 -0400; A word of caution on this. Tuners have no standard power rating methods. I have no idea what the Palstar tuner is, but Ameritron ATR-30 handles 3000 watts of actual RF output on SSB, CW and RTTY from; /archives//html/Towertalk/1998-08/msg00915.html (7,721 bytes)
192. [TowerTalk] Insulator life question (score: 1): Author: w8ji.tom@MCIONE.com (w8ji.tom); Date: Fri, 28 Aug 1998 09:27:29 -0400; I want to make spreaders for open wire line. My plan is to have a CNC machine punch out several hundred spacers with slots for the main wire and holes for a small tie wire. I'm going to try and make; /archives//html/Towertalk/1998-08/msg00947.html (7,528 bytes)
193. [TowerTalk] More on Bobtails (score: 1): Author: w8ji.tom@MCIONE.com (w8ji.tom); Date: Sat, 29 Aug 1998 10:29:39 -0400; I used a Bobtail years ago, the conventional three element kind. It worked OK on 75 meters, but almost never as well as two inverted V dipoles with 40 feet apex that were phased. Mine was out in the; /archives//html/Towertalk/1998-08/msg00973.html (8,126 bytes)
194. [TowerTalk] Bobtail question (score: 1): Author: w8ji.tom@MCIONE.com (w8ji.tom); Date: Sat, 29 Aug 1998 15:41:07 -0400; Hi Bob, A trivia question! It's not quite a Bobtail, but it still worked well. That antenna is common at SW BC stations. It was popularized through use at VOA stations, and even earned the name USIA; /archives//html/Towertalk/1998-08/msg00983.html (9,425 bytes)
195. [TowerTalk] More on Bobtails (score: 1): Author: w8ji.tom@MCIONE.com (w8ji.tom); Date: Sat, 29 Aug 1998 15:44:12 -0400; To: <towertalk@contesting.com> worked Bzzzzt. Typo. Make that two inverted Vee dipoles at 140 feet apex on 75. -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contes; /archives//html/Towertalk/1998-08/msg00984.html (7,863 bytes)
196. [TowerTalk] Hairpin (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Sun, 05 Jul 1998 18:35:33 +0000; There were some good responses to this question, but I'd like to add one more thing. This also applies to ANY antenna. If the feedline is more than a few degrees electrical length between the antenna; /archives//html/Towertalk/1998-07/msg00183.html (8,365 bytes)
197. [TowerTalk] test disregard (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Mon, 06 Jul 1998 21:27:03 +0000; Server problem test 73, Tom W8JI w8ji.tom@MCIONE.com -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contes; /archives//html/Towertalk/1998-07/msg00219.html (6,607 bytes)
198. [TowerTalk] Looking for 45/55G (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Tue, 07 Jul 1998 11:02:12 +0000; I know this is a long shot, but I'm looking for *good* 45G (or 55G) tower. NO RUST or BENDS! I need about 50 sections total. 73, Tom W8JI w8ji.tom@MCIONE.com -- FAQ on WWW: http://www.contesting.com/; /archives//html/Towertalk/1998-07/msg00233.html (6,656 bytes)
199. [TowerTalk] server problem test ignore (score: 1): Author: w8ji.tom@MCIONE.com (Tom Rauch); Date: Wed, 08 Jul 1998 11:12:41 +0000; test 73, Tom W8JI w8ji.tom@MCIONE.com -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Proble; /archives//html/Towertalk/1998-07/msg00250.html (6,687 bytes)
200. [TowerTalk] Twin lead feedline (score: 1): Author: w8ji.tom@MCIONE.com (w8ji.tom); Date: Fri, 10 Jul 1998 09:49:43 -0400; Hi Mark, The early charts had gross errors in attenuation for these line types, I have no idea if the later ones do. The error was in the direction of much to little loss. take Remember MOST 450 ohm; /archives//html/Towertalk/1998-07/msg00301.html (7,678 bytes)

Current List: 181 - 200
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17]