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

Total 367 documents matching your query.

261. [TowerTalk] 75 ohm coax matching (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Mon, 7 Jul 1997 17:44:57 -0400 (EDT); The series-section transformer has been in the ARRL books since its first publication in QST in 1978. Frank Regier, OD5CG, performed the most complete analysis of this technique, showing also that it; /archives//html/Towertalk/1997-07/msg00267.html (8,074 bytes)
262. [TowerTalk] QUAD : coax switching and 40m.. (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Tue, 8 Jul 1997 07:57:24 -0400 (EDT); Shorting a 1/4 wl line at the far end presents a very high impedance at the antenna and, opening the quad loop. An open at the far end presents a very low impedance at the antenna junction end, esse; /archives//html/Towertalk/1997-07/msg00290.html (9,999 bytes)
263. [TowerTalk] some trap graphs (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Tue, 8 Jul 1997 10:03:37 -0400 (EDT); To try to answer some unanswered questions about the relationship of trap Q, wire size, and performance, I have begun some systemmatic modeling of the 10-20 meter dipole as a test case (the first amo; /archives//html/Towertalk/1997-07/msg00294.html (7,882 bytes)
264. [TowerTalk] gamma match vs tee match (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Wed, 9 Jul 1997 07:39:30 -0400 (EDT); Gerald has put his finger on a key aspect of the gamma/Tee situation. I had posted some notes on Tee matches before discovering some problems of unknown size in modeling dissimilar diameter parallel; /archives//html/Towertalk/1997-07/msg00330.html (9,382 bytes)
265. [TowerTalk] More on traps (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Thu, 10 Jul 1997 09:25:43 -0400 (EDT); I have added further notes to the systemmatic trap modeling entry at my site, to include aluminum and wire elements from Q=25 to Q=1600, with notes also on the effects of the L/C ratio in the trap. S; /archives//html/Towertalk/1997-07/msg00369.html (7,351 bytes)
266. [TowerTalk] modeling the 402CD (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Fri, 11 Jul 1997 18:14:09 -0400 (EDT); The discussion of results from modeling the 402CD deserve some comment, because the antenna is not an easy one to model on NEC2. First, using EZNEC, with its stepped diameter correction feature, can; /archives//html/Towertalk/1997-07/msg00414.html (10,201 bytes)
267. [TowerTalk] Re: 40M Interference (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Wed, 16 Jul 1997 07:08:29 -0400 (EDT); The world is full of inadequately filtered and/or regulated supplies, like the old RS in question. Most, however, have reasonably adequate transformers and at least semi-decent cases, the two most ex; /archives//html/Towertalk/1997-07/msg00551.html (8,113 bytes)
268. [TowerTalk] V-beam Gain and R+/-jX (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Fri, 18 Jul 1997 08:52:55 -0400 (EDT); Let me second this motion concerning ATUs. Most ATUs based on single ended netowrk design do not have the range of output values necessary to effect a match at the lowest possible network loss over; /archives//html/Towertalk/1997-07/msg00597.html (9,090 bytes)
269. [TowerTalk] 3-way special for 40 (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sun, 20 Jul 1997 06:52:03 -0400 (EDT); Just placed some notes on the above title at the site. Simple 3-way triangular array for 40 with a top height of 22', no ground plane, switchable directions, 10-12 dB F-B, no phase-lines, low gain bu; /archives//html/Towertalk/1997-07/msg00641.html (7,601 bytes)
270. [TowerTalk] 40/80M Shortened Dipole (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Thu, 24 Jul 1997 07:26:20 -0400 (EDT); Wayne, Your proposal to add three tails to the 40/80 dipole is certainly plausible. However, because the tails may interact, you may have to play with the lengths to get what you want. Spraying the t; /archives//html/Towertalk/1997-07/msg00712.html (7,647 bytes)
271. [TowerTalk] RE: Scotch 88 (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Fri, 25 Jul 1997 20:29:50 -0400 (EDT); If you have been drinking Scotch for 88 years, it must be good stuff. -73- LB, W4RNL -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative re; /archives//html/Towertalk/1997-07/msg00737.html (7,375 bytes)
272. [TowerTalk] Small note on Yagis at site (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Fri, 25 Jul 1997 20:36:02 -0400 (EDT); Added a small note on contrasting 3-element Yagi designs--one for gain/F-B, the otheer for 50-ohm feed with a wide bandwidth--at the site. title: 2 X 3 = 6 That is, 2 3-element beams for 6 meters--th; /archives//html/Towertalk/1997-07/msg00739.html (7,471 bytes)
273. [TowerTalk] Re: Antenna analyzers (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sun, 27 Jul 1997 07:12:57 -0400 (EDT); Re: susceptibility of the Autek and MFJ to erroneous readings when there are nearby high power stations. If you think about the nature of either instrument, you will understand that the problem is le; /archives//html/Towertalk/1997-07/msg00759.html (9,887 bytes)
274. [TowerTalk] Scotch 88 (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sun, 27 Jul 1997 07:47:35 -0400 (EDT); Since my note was the one cited, let me apologize if anyone took offense. The question was not correct grammar, for the grammar was correct. No comma was needed. However, we all from time to time say; /archives//html/Towertalk/1997-07/msg00760.html (8,405 bytes)
275. [TowerTalk] Bazooka (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Thu, 31 Jul 1997 07:50:26 -0400 (EDT); Bill, Essentially, you are correct. In most horizontal phased array systems I have looked at, the 4.5 dB improvement is a bit optimistic. Some a bit over 4 dB is more like it, and you can get similar; /archives//html/Towertalk/1997-07/msg00879.html (8,169 bytes)
276. [TowerTalk] SB-220 affecting SWR curves (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Thu, 5 Jun 1997 06:54:47 -0400 (EDT); Hate to disagree, but changing the length of coax by a short amount should not change the SWR, although it will change the resistance and reactance presented to the meter. However, they still calcula; /archives//html/Towertalk/1997-06/msg00194.html (8,307 bytes)
277. [TowerTalk] telling the compant what's what (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Thu, 5 Jun 1997 08:06:34 -0400 (EDT); A recent message recommended that, if we decide not to use a company because of defective customer service, we write explaining why in clear, rational terms. I concur because in at least some cases i; /archives//html/Towertalk/1997-06/msg00198.html (8,016 bytes)
278. [TowerTalk] Guys & Towers (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Thu, 5 Jun 1997 09:42:28 -0400 (EDT); When we had only the harmonically related bands, finding guy lengths that were relatrively non-interactive was easier than today, with the WARC bands added. However, this note is about the focus on S; /archives//html/Towertalk/1997-06/msg00206.html (11,086 bytes)
279. [TowerTalk] Pardon the imposition (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Fri, 6 Jun 1997 09:43:27 -0400 (EDT); I hope this note will not impose too much on those not interested, but had a couple of inquiries, with troubles getting replies to the senders. First problem is my own darn fault. I erased a message; /archives//html/Towertalk/1997-06/msg00225.html (8,861 bytes)
280. [TowerTalk] Switching 450 ohm twinlead? (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Fri, 6 Jun 1997 21:27:53 -0400 (EDT); Henry, Unless you are using a matched 450-ohm load to 450-ohm lead, the impedance bumps created by relay spacing will be in almost all instances meaningless and minor, with no consequences for effici; /archives//html/Towertalk/1997-06/msg00254.html (9,745 bytes)

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