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221. Topband: Delta Loop (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 12 Nov 2001 08:00:20 -0500; Hi All, There certainly isn't any free lunch with antennas, and we always have limitations or tradeoffs on what we can do compared to ideal situations. The problem with comparisons is we often compar; /archives//html/Topband/2001-11/msg00047.html (11,885 bytes)
222. Topband: Propagation info (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 14 Nov 2001 16:32:54 -0500; Although I find the A and K mostly useless, I do see a clear trend that follows the Aurora level for near-the-pole paths. I use a system that automatically e-mails me the solar conditions in a level; /archives//html/Topband/2001-11/msg00057.html (6,901 bytes)
223. Topband: JT1 Polar Path (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 20 Nov 2001 19:41:20 -0500; us. JT1 was SE on 160 last evening, and almost due south today on 160. JT1 was SSE on 80 meters tonight, and quite good. Just like with XZ1 and other stations way out on the edge, the path is virtua; /archives//html/Topband/2001-11/msg00074.html (7,480 bytes)
224. Topband: re: [CQ-Contest] 2003 CQ 160 Change Coming (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 21 Nov 2001 05:34:52 -0500; No, it sure sounds foolish to me!! I don't know what is behind the idea, but it means exactly what you say. Now many people will have to operate three nights, with fewer rewards in QSO's. So now we; /archives//html/Topband/2001-11/msg00077.html (7,999 bytes)
225. Topband: More skew (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 8 Oct 2001 06:40:53 -0400; This morning at 0920 onwards VK3ZL is skewed NW from normal WSW. SFI:173 | A:2 | K:3 up from 2 at 0900 on 8 October. SAF: low, GMF: quiet to unsettled Aurora Level: 6 73, Tom W8JI W8JI@contesting.com; /archives//html/Topband/2001-10/msg00046.html (6,157 bytes)
226. Topband: Shunt-feeding (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 9 Oct 2001 16:56:10 -0400; Two points to remember: 1.) Insulated elements can have an arcing problem when used on a shunt-fed tower. This is especially true when moisture is present, and the insulation poor (like fiberglass or; /archives//html/Topband/2001-10/msg00065.html (8,714 bytes)
227. Topband: 3D2C (Notes from a topband zombie) (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 9 Oct 2001 17:18:04 -0400; 3D2CI has a consistent but weak signal here, compared to others from the same general area. T32EQ is far away from 3D2, and might not be a good basis for comparison. I'm almost certain the 3D2 I hea; /archives//html/Topband/2001-10/msg00066.html (7,790 bytes)
228. Topband: Elevating radials (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 10 Oct 2001 20:17:09 -0400; Yes, they will reduce the effective height of the antenna. 73, Tom W8JI W8JI@contesting.com; /archives//html/Topband/2001-10/msg00081.html (7,161 bytes)
229. Topband: Elevating radials (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 11 Oct 2001 12:24:24 -0400; I mean height. It is a vertical antenna. It makes it look electrically not as tall, which is the same as having less height. 73, Tom W8JI W8JI@contesting.com; /archives//html/Topband/2001-10/msg00084.html (6,911 bytes)
230. Topband: Shuntfeeding (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 12 Oct 2001 20:20:44 -0400; Actually .025 wavelength or so open-end spacing pretty much makes it look like a solid sheet of copper electrically. That falls reasonably well in line with three meters (it is actually four meters); /archives//html/Topband/2001-10/msg00096.html (7,530 bytes)
231. Topband: shunt feeding a crank-up tower (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 17 Oct 2001 04:14:54 -0400; Hi Greg, First, if that antenna has insulated elements you may be heading for problems unless you ground the elements to the boom for 160- meter RF currents. Keep in mind currents flow in unexpected; /archives//html/Topband/2001-10/msg00127.html (7,842 bytes)
232. Topband: Verticals and Radials (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 17 Oct 2001 04:14:54 -0400; In an effort to bring a pattern into spec, an engineer cut and removed radials in the null area of the towers at WAAM radio in Michigan, a location with fairly good farmland. The only measurable thi; /archives//html/Topband/2001-10/msg00128.html (7,318 bytes)
233. Topband: Beverage coax (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 21 Oct 2001 06:51:50 -0400; Hi Bob, The shield is the least of things affecting coax radiation problems on HF through upper VHF. Thick multiple-shields can be a good thing because they can take a lightning hit with less worry; /archives//html/Topband/2001-10/msg00180.html (8,496 bytes)
234. Topband: E30NA (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 23 Oct 2001 20:41:18 -0400; The 40 meter operator said the noise was very bad on 160 meters but they would keep trying. Last night they seemed to hear much better closer to their sunrise, which would make sense if they had sto; /archives//html/Topband/2001-10/msg00198.html (6,611 bytes)
235. Topband: A word from the master W1BB (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 24 Oct 2001 08:32:45 -0400; It is well known and documented (like in the Brown Lewis and Epstein study at RCA) with 1/4 wl radials, efficiency is nearly 100% with only 50-60 radials. Once efficiency is near 100%, very little c; /archives//html/Topband/2001-10/msg00201.html (8,490 bytes)
236. Topband: BD8MO (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 24 Oct 2001 08:32:45 -0400; BD8MO was in RST 439-459 from a west path today at sunrise, but unfortunately was in some slow speed ragchews with JA's after he worked 9M2AX. (Ross was 569 here on a NW path.) BD8MO only gave JA1HQT; /archives//html/Topband/2001-10/msg00202.html (6,421 bytes)
237. Topband: Internet access via power lines reborn in Europe (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 3 Sep 2001 11:34:46 -0400; It would be very good if amateurs in Mannheim, Germany to check this system out and document the lack of interference! I suspect the ending statement is not correct, since I can hear computers using; /archives//html/Topband/2001-09/msg00009.html (8,956 bytes)
238. Topband: Shunt feed vs sloper (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 11 Sep 2001 20:44:15 -0400; Modeling shows that this is true -- the Yagi acts like a top That would very much depend on the tower height, and the size of the yagi. The main problem with slopers is they are very dependent on wha; /archives//html/Topband/2001-09/msg00026.html (7,814 bytes)
239. Topband: Shunt feed vs sloper (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 12 Sep 2001 15:25:45 -0400; Hi Dean, It helps to look at the extremes. At the best extreme is a substantial disc at the top of the tower near 1/4wl in radius, and a 1/4 wl grounded tower. This should produce minimum current in; /archives//html/Topband/2001-09/msg00032.html (8,628 bytes)
240. Topband: Enhanced electron recombination (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 14 Sep 2001 14:19:49 -0400; While that is interesting and informative, I'm not entirely sure the path to Mongolia is predictable by looking at the poles. That might work out on the left coast, but certainly not east of the Mis; /archives//html/Topband/2001-09/msg00038.html (7,691 bytes)

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