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References: [ +from:jljarvis@adelphia.net: 38 ]

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21. [Towertalk] rope (score: 1): Author: jljarvis@adelphia.net (jljarvis); Date: Tue, 11 Jun 2002 13:04:55 -0400; Jimmy, You don't want poly rope. It UV degrades, doesn't hold knots well, and is not overly strong. You don't want Nylon rope, either, as it's too stretchy. Great for anchor lines for boats....lousy; /archives//html/Towertalk/2002-06/msg00142.html (7,940 bytes)
22. [Towertalk] structural assumptions// rope--bolts (score: 1): Author: jljarvis@adelphia.net (jljarvis); Date: Wed, 12 Jun 2002 13:03:03 -0400; It's interesting to observe the assumptions we make about mechanical gear. to wit: * 1/8" stainless aircraft cable breaking strength is similar to that of 1/2" braided dacron. It's also a lot harder; /archives//html/Towertalk/2002-06/msg00156.html (8,041 bytes)
23. [Towertalk] sixpack relay problem (score: 1): Author: jljarvis@adelphia.net (jljarvis); Date: Tue, 18 Jun 2002 12:59:56 -0400; Privately, I observed that the most likely problem was IR drop, or a bad relay. Let me repeat it publicly: Even though the 'run' is only 3 feet, there is EITHER an IR drop somewhere in the circuit, o; /archives//html/Towertalk/2002-06/msg00265.html (7,233 bytes)
24. FW: [Towertalk] sixpack relay problem (score: 1): Author: jljarvis@adelphia.net (jljarvis); Date: Tue, 18 Jun 2002 17:52:34 -0400; I can't post to the list from here. ohmmeter from the "ground" side of the relay winding to the chassis and then to the ground side of the control box. Guy. K2AV. To: <towertalk@contesting.com>; /archives//html/Towertalk/2002-06/msg00277.html (8,529 bytes)
25. [Towertalk] non-conductive guys//insulator broken guys (score: 1): Author: jljarvis@adelphia.net (jljarvis); Date: Tue, 25 Jun 2002 06:52:56 -0400; One point, two questions: 1) Most (?)(many) commercial towers which break up their guy systems are operating transmitters on a single frequency, and can choose appropriate guy lengths to minimize re-; /archives//html/Towertalk/2002-06/msg00377.html (6,955 bytes)
26. [Towertalk] 468/f (score: 1): Author: jljarvis@adelphia.net (jljarvis); Date: Wed, 26 Jun 2002 04:17:32 -0400; When I was a kid, the ARRL handbook offered 468/f as an approximation of the length of a dipole @ 1/2 wave height. It was stated rather clearly that trimming would be required to accomodate site-var; /archives//html/Towertalk/2002-06/msg00411.html (7,074 bytes)
27. [Towertalk] 468/f (score: 1): Author: jljarvis@adelphia.net (jljarvis); Date: Wed, 26 Jun 2002 09:33:07 -0400; Mauri, You are absolutely right. I wouldn't DREAM of messing with a complex multi-element array without prior modelling. In fact, I am in process of doing just that, with a stack of lpda's right now.; /archives//html/Towertalk/2002-06/msg00415.html (10,621 bytes)
28. [Towertalk] Ground Tackle...errr....guy anchors (score: 1): Author: jljarvis@adelphia.net (jljarvis); Date: Wed, 26 Jun 2002 14:42:19 -0400; Folks, Lest anyone miss the point of the multiple posts.... it's the SOIL that matters most. Every example offered was with a gravel/clay soil. From his e-mail address, Julio is in Florida. Sandy soi; /archives//html/Towertalk/2002-06/msg00425.html (7,358 bytes)
29. [Towertalk] NY State antenna legislation (score: 1): Author: jljarvis@adelphia.net (jljarvis); Date: Sun, 30 Jun 2002 13:34:27 -0400; It would be inappropriate--and probably negative in impact, for out of state hams to comment on a NY legislative matter. However, if this law does, indeed, specify a 95 foot limit, it's a gross mista; /archives//html/Towertalk/2002-06/msg00523.html (9,262 bytes)
30. [Towertalk] 32' heavy duty boom (score: 1): Author: jljarvis@adelphia.net (jljarvis); Date: Mon, 13 May 2002 09:48:09 -0400; Folks, I have a .250 wall, 3", 32' boom, with one splice, at the 20' point. Would be good for a 3 el 40, if any US east coaster is contemplating building. Or, it works for its intended purpose, which; /archives//html/Towertalk/2002-05/msg00339.html (6,685 bytes)
31. [Towertalk] Lightning Ground (score: 1): Author: jljarvis@adelphia.net (jljarvis); Date: Tue, 14 May 2002 15:16:33 -0400; I read the Polyphaser piece with some amusement. He's right-on with what he's proposing, but as many have observed, we don't need to be up 24/7, and the thorough approach is not cost effective. Try a; /archives//html/Towertalk/2002-05/msg00360.html (8,309 bytes)
32. [Towertalk] Dayton coda (score: 1): Author: jljarvis@adelphia.net (jljarvis); Date: Mon, 20 May 2002 08:22:18 -0400; One last post on this topic? It was a strange year. Antenna/DX/Contest forums were interesting. Hooking up with old friends was the high point. The contest dinner, though packed, was no indication of; /archives//html/Towertalk/2002-05/msg00504.html (6,876 bytes)
33. [Towertalk] Rohn (score: 1): Author: jljarvis@adelphia.net (jljarvis); Date: Tue, 21 May 2002 08:09:28 -0400; Based on their QST ads, and the discontinuation of the foldover product, it was my belief that Rohn had adopted a 'harvest-withdraw' strategy for the amateur market. Not displaying would be consisten; /archives//html/Towertalk/2002-05/msg00558.html (6,397 bytes)
34. [Towertalk] pine tree verticals (score: 1): Author: jljarvis@adelphia.net (jljarvis); Date: Tue, 21 May 2002 16:37:56 -0400; Jimbo.... Shoot some rope over the pines, and hoist up elevated GP's. Make at least 3 radials @ 5% longer than resonance, and go to town. You can make it a dual bander by using transmitting twinlead; /archives//html/Towertalk/2002-05/msg00584.html (7,402 bytes)
35. [Towertalk] rohn foldover base (score: 1): Author: jljarvis@adelphia.net (jljarvis); Date: Tue, 28 May 2002 09:01:32 -0400; Ford, I misread your initial post... "The bolt holes in the TUBES (my emphasis) were enlarged." I had assumed it was the hinge-tab holes which had enlarged..but elongation of the tower leg holes sugg; /archives//html/Towertalk/2002-05/msg00722.html (6,817 bytes)
36. [Towertalk] wiggle moments: defined (score: 1): Author: jljarvis@adelphia.net (jljarvis); Date: Tue, 28 May 2002 13:34:07 -0400; See what happens when you go into marketing? Get an MBA and all your BS credits get erased. :) Just hanging around with sales guys will enrich your engineering vocabulary to the point of imprecision!; /archives//html/Towertalk/2002-05/msg00727.html (6,934 bytes)
37. [Towertalk] ping-pong stacks (score: 1): Author: jljarvis@adelphia.net (jljarvis); Date: Wed, 29 May 2002 16:44:22 -0400; Folks, Anybody got any feedback they'd care to offer on the topic of feeding a 2 yagi stack OUT of phase? Anybody experimented or modelled with less than 180 degree phase reversals? i.e. 90, 60, 30..; /archives//html/Towertalk/2002-05/msg00780.html (6,923 bytes)
38. [Towertalk] model (score: 1): Author: jljarvis@adelphia.net (jljarvis); Date: Thu, 30 May 2002 10:11:13 -0400; Pete, all: I agree that a simple model is the right approach. A re-read of PV's book is probably in order, as well. My own experience with out-of-phase stacks was inconclusive, but not rigorous, as i; /archives//html/Towertalk/2002-05/msg00805.html (6,938 bytes)

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