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References: [ +from:cebik@utkux.utcc.utk.edu: 367 ]

Total 367 documents matching your query.

221. [TowerTalk] 2-Faced Dir/DE Yagis (40-30) (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Thu, 4 Sep 1997 06:57:24 -0400 (EDT); I was asked if the open-sleeve coupled opposite direction combination for 12 and 17 could be adapted to 40 and 30 meters. The answer is yes, if you have plenty of side-to-side room. I scaled the ante; /archives//html/Towertalk/1997-09/msg00111.html (8,118 bytes)
222. [TowerTalk] Wire beam updates and a note on the 12-17 opposing beams (score: 1): Author: L. B. Cebik" <cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sat, 6 Sep 1997 08:25:11 -0400 (EDT); I have updated the "Notes on lower-HF wire beams" at my site to include some interesting design ideas provided to me and used by permission of Carrol Allen, AA2NN. He has refined 40-meter reversible; /archives//html/Towertalk/1997-09/msg00152.html (9,490 bytes)
223. [TowerTalk] Metal House Siding and Antennas (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Tue, 9 Sep 1997 20:03:37 -0400 (EDT); I lived in a house many years ago with aluminum siding and encountered the following problem (as closely as I can analyze it: junctions of siding strips to another created what as best I can tell amo; /archives//html/Towertalk/1997-09/msg00234.html (8,628 bytes)
224. [TowerTalk] staggering Yagis (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sat, 13 Sep 1997 08:50:39 -0400 (EDT); I just put the results of a little modeling project at the site under the title "1-2-3: 1 boom, 2-bands, 3 Elements Each." The goal was to put at least two 3-element Yagis on one boom of reasonable l; /archives//html/Towertalk/1997-09/msg00327.html (7,895 bytes)
225. [TowerTalk] more staggering Yagis (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sun, 14 Sep 1997 10:04:52 -0400 (EDT); On a bet, I explored the possibility of employing the same staggering technique with 4-element Yagis. Yes, it can be done. Yes, it has some advantages. Yes, it has some limitations. Notes on the idea; /archives//html/Towertalk/1997-09/msg00339.html (7,540 bytes)
226. [TowerTalk] NEC-4 anomaly (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Thu, 18 Sep 1997 18:13:13 -0400 (EDT); Found another one of those limitations of NEC-4--or at least something quite contrary to MININEC, which yields a more sensible looking result. Has to do with dipole-type elements with center sections; /archives//html/Towertalk/1997-09/msg00540.html (7,709 bytes)
227. [TowerTalk] 280 ft boom yagi (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Fri, 19 Sep 1997 06:31:31 -0400 (EDT); Ionize the water sprays and turn it into a Yagi with arching elements. LB, W4RNL -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative reque; /archives//html/Towertalk/1997-09/msg00558.html (7,482 bytes)
228. [TowerTalk] More NEC-4 anomalies (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sat, 20 Sep 1997 10:01:13 -0400 (EDT); To the notes on possible NEC-4 anomalies with antenna elements having larger center sections, I have added another note on similar anomalies with "Close-Spaced Wires" between MININEC and NEC-4. (I am; /archives//html/Towertalk/1997-09/msg00572.html (7,818 bytes)
229. [TowerTalk] More on MININEC/NEC-4 with close wires (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Mon, 22 Sep 1997 17:40:19 -0400 (EDT); I have added some further data and three new graphs to the posting on the difference between MININEC and NEC-4 with respect to models with closely spaced wires. I hope the additions are useful. -73-; /archives//html/Towertalk/1997-09/msg00597.html (7,449 bytes)
230. [TowerTalk] More on closely spaced elements and antenna models (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Wed, 24 Sep 1997 22:00:58 -0400 (EDT); I have added a few more notes and data to the file on the effects of close spacing of elements on antenna model output figures. Some of them show the difference a good model and make relative to a ca; /archives//html/Towertalk/1997-09/msg00654.html (7,575 bytes)
231. [TowerTalk] Tuned Feeders (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sat, 27 Sep 1997 06:11:16 -0400 (EDT); Tom, If you are willing to adjust the tuner, 300-ohm line should not create significant additiona losses compared to windowed 450-ohm line. However, there may be advantages to using one of the heavie; /archives//html/Towertalk/1997-09/msg00710.html (9,007 bytes)
232. [TowerTalk] Very long wire (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sat, 27 Sep 1997 07:31:25 -0400 (EDT); George, Did a couple of quick checks on the 10K' wire at 160 and 80. These are not definitive results since I need a lot more segments per unit length for accuracy. But as an initial ball park, here; /archives//html/Towertalk/1997-09/msg00713.html (8,990 bytes)
233. [TowerTalk] more 12-17 meter antenna ideas (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sat, 27 Sep 1997 21:47:56 -0400 (EDT); At the Web site, I just placed a brief note on a possible design for a combined 12 and 17 meter 2-element quad. The 12 meter quad works on 17 through the addition of "hat" wires inside the loop, and; /archives//html/Towertalk/1997-09/msg00729.html (7,895 bytes)
234. [TowerTalk] 40 meter rotary dipole (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Tue, 30 Sep 1997 06:47:05 -0400 (EDT); Dennis, A rotatable dipole is very useful, and you will get directional--actually bi-directional--effects so that you can null some QRM to the side. At 60' up, which is over 0.4 wl, the pattern will; /archives//html/Towertalk/1997-09/msg00789.html (8,115 bytes)
235. [TowerTalk] Patience, please (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sun, 10 Aug 1997 15:42:37 -0400 (EDT); Sorry to bother all those to whom this is irrelevant, but I had no way to extract a list of direct mail addresses from the 750 messages in my inbox, a good number of which contain questions and comme; /archives//html/Towertalk/1997-08/msg00373.html (7,467 bytes)
236. [TowerTalk] Re: Need Ideas for 2-band Dipole (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Mon, 11 Aug 1997 07:08:54 -0400 (EDT); Bob, The suggested trap idea might well be the best solution for the antenna to work on both 80 and 160, given that the single antenna is a constant in the installation equation. Tuning the trap to a; /archives//html/Towertalk/1997-08/msg00384.html (8,627 bytes)
237. [TowerTalk] RE: 6db per s-unit? (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Mon, 11 Aug 1997 09:41:56 -0400 (EDT); The proposal for an industry-wide standard of 1 S-unit = 6 dB goes back into the 40s. It was never adopted on an industry-wide basis, basically because it was (and still is) a daunting task to equali; /archives//html/Towertalk/1997-08/msg00390.html (10,245 bytes)
238. [TowerTalk] Gap Vertical, Verticals in general (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Mon, 11 Aug 1997 10:25:09 -0400 (EDT); Although both books are cionsidered classics in ham circles, both contain dated material that has been superceded. Indeed, both should be classified as "vertical with ground plane" books, where gp i; /archives//html/Towertalk/1997-08/msg00391.html (11,274 bytes)
239. [TowerTalk] Trap resonance (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Mon, 11 Aug 1997 11:52:22 -0400 (EDT); The selection of a frequency below the higher band limit is for a reason: to equalize the gains of the antennas. Selecting a frequency for the trap within or at the low end of the upper band results; /archives//html/Towertalk/1997-08/msg00396.html (9,358 bytes)
240. [TowerTalk] Traped antenna for 2:1 freq range (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Tue, 12 Aug 1997 07:59:39 -0400 (EDT); I rarely reply to such notes, but in this case, perhaps we can dispel some misconceptions so that no one will think a. that any laws of physics are being violated (although I do not see any evidence; /archives//html/Towertalk/1997-08/msg00410.html (13,693 bytes)

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