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Total 367 documents matching your query.

101. [TowerTalk] Wire Size and Material (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sat, 8 Aug 1998 08:09:07 -0400 (EDT); Some recent discussions about the potential losses of stainless steel in some antenna applications and the renewed availability of phosphor bronze as an antenna material resulted mixed reviews in eac; /archives//html/Towertalk/1998-08/msg00182.html (8,111 bytes)
102. [TowerTalk] Voltage Feeding SCV Loops (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Thu, 13 Aug 1998 18:12:23 -0400 (EDT); For those interested in SCVs (deltas, rectangles, and half squares, all set up for max vertically polarized radiation for lesser gain but a low TO angle), I have just added a short note on how to fee; /archives//html/Towertalk/1998-08/msg00402.html (7,555 bytes)
103. [TowerTalk] 1/2 square Antenna (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Thu, 13 Aug 1998 21:10:26 -0400 (EDT); Lester, Not sure what parameter you are referring to when you note that the ha;lf square has a narrow bandwidth of less than 2-1. The half square, when used for its vertically polarized radiation, is; /archives//html/Towertalk/1998-08/msg00407.html (8,137 bytes)
104. [TowerTalk] 80m antenna (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Thu, 20 Aug 1998 06:02:27 -0400 (EDT); John, I cannot speak to the interaction question on your proposed 80-meter dipole, although the spacing does seem close. However, a rotatable dipole has distinct advantages over an inverted Vee. Let; /archives//html/Towertalk/1998-08/msg00590.html (9,446 bytes)
105. [TowerTalk] Horizontal Phased Arrays with Directors (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Thu, 27 Aug 1998 22:11:50 -0400 (EDT); Some discussions on more than one list of phased arrays with parasitic director(s) left a few questions, such as what performance are they capable of and how does one go about designing one. I have p; /archives//html/Towertalk/1998-08/msg00931.html (7,897 bytes)
106. [TowerTalk] Bobtails (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Fri, 28 Aug 1998 21:37:48 -0400 (EDT); SM4CAN is an expert on Bobtails, and wrote a booklet in the late 80s on the antenna. He has built many and swears by them as low-band DX antennas. My own modeling confirms both his measurements and h; /archives//html/Towertalk/1998-08/msg00961.html (8,071 bytes)
107. [TowerTalk] ON4ANT's 5-Band Yagis (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Fri, 28 Aug 1998 22:06:02 -0400 (EDT); Johan Van de Velde, ON4ANT (what a great call for an antenna experimenter) asked if I might place his latest designs at my site to make them available to others who might like to consider, model, or; /archives//html/Towertalk/1998-08/msg00963.html (8,322 bytes)
108. [TowerTalk] More on Bobtails (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sat, 29 Aug 1998 08:47:05 -0400 (EDT); Dave's notes on the Bobtail are an excellent supplement to the subject. The Bobtail was "invented" first, with the half-square later, although the half square is--from the perspective of basic theory; /archives//html/Towertalk/1998-08/msg00971.html (9,981 bytes)
109. [TowerTalk] More on Bobtails (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sat, 29 Aug 1998 10:56:40 -0400 (EDT); Most SCVs show a very slow rate of change in the source resistance and an almost linear change in reactance across the ham band. The patterns appear not to change in any dramatic way. Hence, what so; /archives//html/Towertalk/1998-08/msg00977.html (8,434 bytes)
110. [TowerTalk] RE: your mail (fwd) (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sun, 30 Aug 1998 06:32:42 -0400 (EDT); I received the following request for information about an old Mosley antenna. If anyone has any info that can help Don, please contact him directly. I know he would be appreciative. -73- LB, W4RNL Al; /archives//html/Towertalk/1998-08/msg00996.html (7,847 bytes)
111. [TowerTalk] 12-17 meter beam update (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sat, 4 Jul 1998 10:18:18 -0400 (EDT); Because of the interest in the dual-band (12/17) open sleeve coupled designs, one of which I noted on one list, I have enlarged the following item at my site: "Director/Driven Element 2-Element Yagis; /archives//html/Towertalk/1998-07/msg00151.html (7,855 bytes)
112. [TowerTalk] Hair Pin feed - ??? (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sat, 4 Jul 1998 21:42:38 -0400 (EDT); Robert, For hairpin calculations, see the WA1SPJ program in the HAMCALC collection--set up from an article in a past issue of Communications Quarterly. The hairpin is a shorted section of parallel fe; /archives//html/Towertalk/1998-07/msg00161.html (7,766 bytes)
113. [TowerTalk] Hairpin (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Mon, 6 Jul 1998 07:01:44 -0400 (EDT); Tod, The out of phase condition arises because the citations from Walt Maxwell refer to SWR. Tom's note refers to the impedance to be measured. The SWR (ignoring line losses) does not change. But, e; /archives//html/Towertalk/1998-07/msg00203.html (10,160 bytes)
114. [TowerTalk] A little more for 12 & 17 (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Mon, 6 Jul 1998 10:03:23 -0400 (EDT); After I posted the expansion of the "Driven Element-Director" item, to add a combination DE-Ref for 17/DE-Dir for 12 to the 17/12 m back-to-back DE-Dir design, I had a couple of inquiries about combi; /archives//html/Towertalk/1998-07/msg00208.html (8,053 bytes)
115. [TowerTalk] 5 long Yagis for 20 (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sun, 12 Jul 1998 13:45:55 -0400 (EDT); As a notebook exercise, I modeled some long Yagis that I have accumulated (45' to 53' booms) for comparison--and came up with some interesting features as well as some cautions about too hastily comp; /archives//html/Towertalk/1998-07/msg00353.html (8,229 bytes)
116. [TowerTalk] Antenna file (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sat, 18 Jul 1998 06:17:54 -0400 (EDT); Ed's request bears a little expansion. One might take a very legal view of his request, but my note is on the level of everyday, ordinary ethical relations among all us hams. The antenna design orig; /archives//html/Towertalk/1998-07/msg00521.html (9,331 bytes)
117. [TowerTalk] Re: [Antennas] Steve's antenna study (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sat, 18 Jul 1998 22:10:34 -0400 (EDT); Actually, 2.15 dB is the gain of a hypothetical resonant dipole with lossless infinitely thin wire over the hypothetical isotropic source in free space. Both are equally theoretical concepts, but th; /archives//html/Towertalk/1998-07/msg00531.html (10,021 bytes)
118. [TowerTalk] Another HB9CV commercial antenna series (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Mon, 20 Jul 1998 21:05:33 -0400 (EDT); They claim to A ZL Special or HB9CV ar both variants of a phased horizntal array. Another version is the Field Day Special, which W7EL published in QST a number of years ago. With proper phasing, 2 e; /archives//html/Towertalk/1998-07/msg00600.html (9,255 bytes)
119. [TowerTalk] update on 5 long 20 m Yagis (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Mon, 20 Jul 1998 21:18:17 -0400 (EDT); After posting a brief study of 5 20-meter long (45-55') Yagis, WB0DGF contributed the HG205xlb to my collection. In adding it to the note, I redid all the runs so that now the graphics record both NE; /archives//html/Towertalk/1998-07/msg00601.html (7,979 bytes)
120. [TowerTalk] Quad Software? (score: 1): Author: cebik@utkux.utcc.utk.edu (L. B. Cebik); Date: Sat, 25 Jul 1998 10:11:58 -0400 (EDT); Gregg, Modeling quads can be effectively done in either MININEC or NEC-2. Since quad elements want to be arranged symmetrically around a center (boom point), one of the packages offering symbolic ent; /archives//html/Towertalk/1998-07/msg00840.html (8,390 bytes)

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