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1. Re: [TowerTalk] How Helically Wound Verticals Really Work (was : Vertical dipoles) (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Thu, 19 Nov 2009 12:14:29 -0800; Not for self construction. However, if one were in the antenna selling business, helical winding could provide a discriminating (and potentially patentable) feature. Company A could say: we're sellin; /archives//html/Towertalk/2009-11/msg00366.html (10,743 bytes)
2. Re: [TowerTalk] Cable working load/breaking strength.../// (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Tue, 17 Nov 2009 17:41:17 -0800; Yep.. that's sort of what I was thinking.. each designer chooses what they want to use as a safety factor for each application. It covers things like material property uncertainty (e.g. was it a slig; /archives//html/Towertalk/2009-11/msg00307.html (8,838 bytes)
3. Re: [TowerTalk] Cable working load/breaking strength.../// (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Tue, 17 Nov 2009 05:52:26 -0800; Maybe you're thinking of guy tensioning recommendations: 1/10th of rated capacity? For a hoist application, the mfr may have different recommendations. Engineering such things is a bit different (wha; /archives//html/Towertalk/2009-11/msg00291.html (8,055 bytes)
4. Re: [TowerTalk] Luso Tower/wind load rating (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Sun, 15 Nov 2009 09:23:20 -0800; my math comes out slightly different (56.25/80 = 0.7), so the rating is going to be half the area.. 20ish square feet. _______________________________________________ ________________________________; /archives//html/Towertalk/2009-11/msg00279.html (7,990 bytes)
5. Re: [TowerTalk] Dipole Z Calculator (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Sat, 07 Nov 2009 07:17:29 -0800; Do you need an equation? or a table lookup? or a callable subroutine? If you have matlab, or can translate matlab into your language of choice, Orfanidis's on-line electromagnetics text book has some; /archives//html/Towertalk/2009-11/msg00149.html (7,957 bytes)
6. Re: [TowerTalk] Single point ground (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Wed, 4 Nov 2009 10:01:03 -0800 (GMT-08:00); do you care about compliance with the electrical code? That might be a starting point..it's going to require a grounding conductor from wherever the coax enters the premises and you have your antenna; /archives//html/Towertalk/2009-11/msg00114.html (10,314 bytes)
7. Re: [TowerTalk] Fwd: Dbi vs DBd (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Wed, 4 Nov 2009 09:57:00 -0800 (GMT-08:00); --Original Message-- I would venture that the only substantial users of dBd are hams and possibly marketeers. The pro modeling tools (NEC and it's ilk, the FDTD programs, etc.) all use dBi. The probl; /archives//html/Towertalk/2009-11/msg00113.html (9,357 bytes)
8. Re: [TowerTalk] Coax Arms for Tri-Ex Crank-Up Towers (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Thu, 29 Oct 2009 04:12:27 -0700; Are you cost constrained? You could have a large spring loaded reel at the bottom that feeds/takes up the cable. One would want to choose a coax that is designed for repeated movement (yep, that Andr; /archives//html/Towertalk/2009-10/msg00454.html (8,306 bytes)
9. Re: [TowerTalk] Please remove my address from the list (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Fri, 23 Oct 2009 10:13:45 -0700; All good suggestions.. but there are a few things that I haven't figured out a good way to do.. To a certain extent, we are constrained by using a fairly nice robust transport mechanism (SMTP). For i; /archives//html/Towertalk/2009-10/msg00409.html (9,531 bytes)
10. Re: [TowerTalk] Station Noise (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Thu, 22 Oct 2009 21:44:32 -0700; It's actually not that ambiguous. Accept, here, means you have no recourse, no matter what happens. You're Part 15, you take whatever anything else dishes out. If it burns you out, tough. If you stop; /archives//html/Towertalk/2009-10/msg00385.html (10,159 bytes)
11. Re: [TowerTalk] Verticals Above Beams (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Thu, 22 Oct 2009 19:08:13 -0700; or luck, luck, luck or sunspots, sunspots, sunspots _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com htt; /archives//html/Towertalk/2009-10/msg00377.html (7,615 bytes)
12. Re: [TowerTalk] Station Noise (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Thu, 22 Oct 2009 19:05:22 -0700; For Part 15 (which others have pointed out may not apply to the fan motor speed controller in question), it's both. There's a radiated and conducted field strength limit and a "shall not interfere, a; /archives//html/Towertalk/2009-10/msg00376.html (9,344 bytes)
13. Re: [TowerTalk] Ground mounting vs roof mounting verticals (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Wed, 21 Oct 2009 21:16:00 -0700; or some other matching method, e.g. a tuner at the base. Resonant radials just provide a reasonably nice resistive impedance at the feedpoint. There's not much difference in "efficiency" of the radia; /archives//html/Towertalk/2009-10/msg00355.html (9,109 bytes)
14. Re: [TowerTalk] LINE FOR tree strung dipoles (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Mon, 19 Oct 2009 20:17:26 -0700; Ladder line and a tuner? _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/ma; /archives//html/Towertalk/2009-10/msg00326.html (9,454 bytes)
15. Re: [TowerTalk] LINE FOR tree strung dipoles (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Mon, 19 Oct 2009 19:12:00 -0700; why wait for vacancy.. the lots in my neighborhood are 50 feet wide, so the houses on either side are basically 100 ft (call it about 30 meters) apart. If I load up the two houses on either side as t; /archives//html/Towertalk/2009-10/msg00320.html (9,833 bytes)
16. Re: [TowerTalk] Station Noise (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Sat, 17 Oct 2009 07:01:12 -0700; A lot of HVAC fans are PSC (split phase capacitor) type, which are basically induction motors, and will change speed nicely with a phase control SCR type controller (e.g. a light dimmer). Fans have a; /archives//html/Towertalk/2009-10/msg00274.html (8,947 bytes)
17. Re: [TowerTalk] Newtons to Sq Ft ? (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Fri, 16 Oct 2009 18:58:52 -0700; Except that he cited 120 km/hr, not 125 km/hr, so 75 mi/hr.. which is a small difference.. BUT I get 14.4 lb/sf are you sure about 0.004? I use 1/391 or about 0.0025 _________________________________; /archives//html/Towertalk/2009-10/msg00270.html (7,766 bytes)
18. Re: [TowerTalk] Newtons to Sq Ft ? (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Fri, 16 Oct 2009 18:53:25 -0700; That's because Titanex is actually giving you useful engineering data.. a load at a velocity. 600 N * 1/4.5 lb/N = 133 lb You're asking to convert a single data point into an equivalent area, which,; /archives//html/Towertalk/2009-10/msg00269.html (8,158 bytes)
19. Re: [TowerTalk] Reply - KW3000 with 1/2 inch Drill Motor - Wrongassumption in responses (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Thu, 15 Oct 2009 19:17:26 -0700; I noticed in one of the trade rags recently (I can't recall which) that you can get single phase in, 3 phase out, variable frequency drives for small motors in the $100 range. They're not the totally; /archives//html/Towertalk/2009-10/msg00236.html (10,769 bytes)
20. Re: [TowerTalk] man lift tips over (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Wed, 14 Oct 2009 06:33:08 -0700; they're about 8 feet across (have to fit on a standard truck for delivery), so 6" out of 8 ft is 5 feet (60") out of 80 ft. Exciting if you're in the basket for the first time, but not inherently uns; /archives//html/Towertalk/2009-10/msg00205.html (8,528 bytes)

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