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161. [TowerTalk] The Tee-Match Revisited (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Wed, 7 Jan 1998 10:40:16 -0500 (EST); The Tee-Match: NEC Illusions and MININEC Realities Many months ago, I attempted to apply NEC-4 to the modeling of a Tee-match system. The original system modeled was based on a 5-element 48'-boom Yag; /archives//html/Towertalk/1998-01/msg00079.html (11,246 bytes)
162. [TowerTalk] something old, something new (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sat, 17 Jan 1998 07:57:48 -0500 (EST); Thinking it might be useful to someone, I have placed the talk I did two years ago at Dayton (and again at 1997 Huntsville) on line. It's called "An Overview of Small Beams" and gives a summary look; /archives//html/Towertalk/1998-01/msg00269.html (7,866 bytes)
163. [TowerTalk] a bit more old and new (score: 1): Author: L. B. Cebik" <cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sun, 18 Jan 1998 13:56:20 -0500 (EST); I have placed another FDIM talk, the one scheduled for the 1997 meeting, which I had to miss, but which I gave at Huntsvillle last August, on the web site. Called "Wi're We Using Wire" and covers som; /archives//html/Towertalk/1998-01/msg00282.html (8,005 bytes)
164. [TowerTalk] stacking 4X 15m beams (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Fri, 23 Jan 1998 22:07:30 -0500 (EST); The 4-way feed Gerald describes is an effective way to distribute power to an array where all 4 antennas are to be fed in phase. The system is described accurately, but I want to add a note. It may b; /archives//html/Towertalk/1998-01/msg00381.html (7,974 bytes)
165. [TowerTalk] 1/4 & 1/2 wl traps (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Fri, 30 Jan 1998 07:40:19 -0500 (EST); Apparently my last try did not get through. Easy way to remember which trap does what with 1/4 wl: the impedance at the connection end is opposite the impedance at the far end. Short = zero ohms, hen; /archives//html/Towertalk/1998-01/msg00504.html (7,589 bytes)
166. [TowerTalk] Duo-Band 10/15 Antenna (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Wed, 3 Dec 1997 07:56:44 -0500 (EST); Gus, If the drive is intact, you might proceed this way on the way to using it as a 10-15 driver. First, at some standard but accessible height, test the driver alone (match removed) and record the f; /archives//html/Towertalk/1997-12/msg00066.html (8,401 bytes)
167. [TowerTalk] rotatable dipoles (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sat, 6 Dec 1997 09:00:28 -0500 (EST); A recent discussion of an add-on 40 meter dipole element certainly confirmed something that George Grammer and Ed Tilton noted 50 years ago: a rotatable dipole is roughly 2/3rds as good as a beam rel; /archives//html/Towertalk/1997-12/msg00142.html (9,004 bytes)
168. [TowerTalk] EZNEC (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sun, 7 Dec 1997 07:44:31 -0500 (EST); Gary, The raw gain figures you are seeing are roughly correct. A dipole at 30' up has a good gain, but notice the high angle of radiation. Most DX requires a lower angle to match the skip angles. You; /archives//html/Towertalk/1997-12/msg00157.html (9,503 bytes)
169. [TowerTalk] re: vert vs dipole (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sun, 7 Dec 1997 08:36:54 -0500 (EST); Gerald, I'm right here. My own reply to Gary appeared on the list a micro-second before your note. Horizontal antennas do indeed enjoy the benefit of downward radiation being reflected back upward a; /archives//html/Towertalk/1997-12/msg00159.html (11,007 bytes)
170. [TowerTalk] EZNEC (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sun, 7 Dec 1997 17:43:07 -0500 (EST); Gary, I assure you that we are concentrating on what is wrong with the model. Nothing is. Possibly, you have not added in wire loss, but the difference would be insignificant relative to copper or al; /archives//html/Towertalk/1997-12/msg00168.html (10,325 bytes)
171. [TowerTalk] sources (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Wed, 10 Dec 1997 06:49:29 -0500 (EST); Frank, Yes, the drooping radials beneath a quarter-wave upper vertical do radiate. The polarization can be thought of as 2 components, horizontal and vertical. The horizontal component is self-cance; /archives//html/Towertalk/1997-12/msg00192.html (9,690 bytes)
172. [TowerTalk] horizntal vs. vertical wires on the low bands (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Wed, 10 Dec 1997 11:55:39 -0500 (EST); I just looked in my files, and the subject of the upcoming column in Low Down is the subject above, which just happens to be a topic recently discussed on the list. So I broke my policy of not puttin; /archives//html/Towertalk/1997-12/msg00196.html (8,288 bytes)
173. [TowerTalk] EZNEC question: transmission lines (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Wed, 10 Dec 1997 20:53:09 -0500 (EST); I responded directly to Dave, but it appears that a more general interest in this feature of NEC programs exists, so will pass along a short note here. EZNEC and similar NEC-2 and NEC-4 implementatio; /archives//html/Towertalk/1997-12/msg00216.html (10,599 bytes)
174. [TowerTalk] Simple Dipoles (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Wed, 10 Dec 1997 21:00:11 -0500 (EST); Lee: Re: 40 meter dipoles 50' up Your problem is essentially the same one brought up recently by Dave Leeson. The feedpoint impedance of a dipole for 40 meters at that height is somewhere in the 70-9; /archives//html/Towertalk/1997-12/msg00217.html (8,112 bytes)
175. [TowerTalk] old books (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Wed, 10 Dec 1997 21:15:47 -0500 (EST); Please! to all who have old books, never (NEVER, please) throw them out without trying to find a new home for them. This is not a plea from a collector who places them on a shelf to show them off, b; /archives//html/Towertalk/1997-12/msg00219.html (7,981 bytes)
176. [TowerTalk] Bobtail-Curtain (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Thu, 11 Dec 1997 06:52:03 -0500 (EST); Carsten, It appears that you plan to feed the bobtail curtain at the bottom of the center vertical. There is an alternative: feed the top of the center vertical, where the impedance will be close to; /archives//html/Towertalk/1997-12/msg00233.html (7,737 bytes)
177. [TowerTalk] RE: old books (off topic) (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Thu, 11 Dec 1997 07:04:53 -0500 (EST); Mike, Books--both new and old--are the heart of learning--and that is the core of what these lists are all about--sharing what we have learned. So with moderator permission, let me make a further sug; /archives//html/Towertalk/1997-12/msg00234.html (8,053 bytes)
178. [TowerTalk] Radials, resonance and the MFJ259 (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Thu, 18 Dec 1997 11:13:06 -0500 (EST); SWR and Impedance: Like the reflection coefficient on which it is based, the SWR along a length of transmission line (lossless) will be everywhere the same. It will slightly decrease in accord with l; /archives//html/Towertalk/1997-12/msg00426.html (9,930 bytes)
179. [TowerTalk] modeling loads (and transmission lines) (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Fri, 19 Dec 1997 22:08:39 -0500 (EST); In answer to some disparate requests, I have placed the start of a new series of items at the site. They are for newer antenna modelers and deal with modeling loads both in R+/-jX and in RLC form. Ad; /archives//html/Towertalk/1997-12/msg00474.html (7,935 bytes)
180. [TowerTalk] RADIAL Questions and Answers (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Tue, 23 Dec 1997 05:46:04 -0500 (EST); Dave's reference to the Smith Chart is apt for many problems. Although the Smith Chart can be used for some problems with a little rote-memorized procedure, it becomes much more useful if it is unde; /archives//html/Towertalk/1997-12/msg00577.html (8,479 bytes)

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