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281. [TowerTalk] Gametracker refills (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Fri, 22 Jul 2005 16:22:06 -0400; Thanks to all who replied. Cabella's stocks gametracker 2500 refills...online order was painless. n2ea _______________________________________________ See: http://www.mscomputer.com for "Self Support; /archives//html/Towertalk/2005-07/msg00570.html (7,205 bytes)
282. [TowerTalk] NVIS (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Fri, 22 Jul 2005 16:46:30 -0400; Interesting thread. But a dipole @ 35' IS an NVIS antenna on 40. Well, not quite. If you want it to be a better NVIS, snuggle a reflector below it. Personal hot button: Guys with dipoles at 35' who c; /archives//html/Towertalk/2005-07/msg00572.html (7,233 bytes)
283. [TowerTalk] dumbing down...extra class test (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Sat, 23 Jul 2005 20:07:51 -0400; This is somewhat dated, but I took the extra exam and the first class radiotelephone exam on the same day, at the FCC office in NYC. Extra in the morning, as a warmup for the first. As it turned out,; /archives//html/Towertalk/2005-07/msg00642.html (7,814 bytes)
284. [TowerTalk] remote station protection (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Sat, 23 Jul 2005 20:22:17 -0400; Can someone discuss the complications of implementing something like this in a high lightning area like central Florida? Despite full PolyPhaser protection I still like to physically disconnect the r; /archives//html/Towertalk/2005-07/msg00644.html (7,960 bytes)
285. [TowerTalk] Finkelstein... (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Sun, 24 Jul 2005 12:13:33 -0400; Been absorbed by watching the end of the Tour de France, so don't remember whether I posted this or not. But the name of the guy with the round glasses in the Varick street office was Finkelstein. Th; /archives//html/Towertalk/2005-07/msg00667.html (7,500 bytes)
286. [TowerTalk] perfect braid... (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Sun, 24 Jul 2005 19:07:13 -0400; -0- What do you mean by "perfect?" -0- So, answer me this, oh gurus...if I have a coax with a tight braid..98%, which is then covered by aluminum foil, how close to perfect is it? My experience is, 9; /archives//html/Towertalk/2005-07/msg00704.html (7,404 bytes)
287. [TowerTalk] folded marconi (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Mon, 25 Jul 2005 13:05:36 -0400; Kevin's question about using a folded marconi received this comment: "There is nothing about a folded INV L that makes it worth the additional effort over a single conductor piece of wire. Its radiat; /archives//html/Towertalk/2005-07/msg00721.html (7,961 bytes)
288. [TowerTalk] OK...I got it....folded. (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Mon, 25 Jul 2005 14:17:28 -0400; Right... Agreed that neither ground losses nor radiation resistance change due to the folded antenna. What happens is simply that the driving point impedance is transformed by the quarter wave sectio; /archives//html/Towertalk/2005-07/msg00727.html (7,288 bytes)
289. [TowerTalk] F12 fasteners (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Tue, 26 Jul 2005 22:18:14 -0400; W2GD was here for dinner tonight, and we had a discussion about this topic, before the nightly digest arrived. John asserts, based on experience, that the F12 antennas he's had in Aruba have held up; /archives//html/Towertalk/2005-07/msg00772.html (7,701 bytes)
290. [TowerTalk] off-base comment (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Tue, 26 Jul 2005 22:25:43 -0400; Bill...I'm flagging you on the following comment: My favorite example is ADD/ADHD for simple misbehavior. Of course it takes a PhD in Education to dream up those new terms! ;-) Little wonder our scho; /archives//html/Towertalk/2005-07/msg00774.html (7,722 bytes)
291. [TowerTalk] stealth antenna---initial report (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Fri, 29 Jul 2005 17:53:28 -0400; TT: Have taken receipt of the 1/8" kevlar/dacron line from radio works. This is mil-spec olive drab stuff, which is rated at 7700 lbs breaking strength, and is about the same diameter as the insulate; /archives//html/Towertalk/2005-07/msg00810.html (8,665 bytes)
292. [TowerTalk] kevlar static rating (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Fri, 29 Jul 2005 22:11:59 -0400; Tnx to Hector, xe2k, for catching the typo. NOT 7700 lbs! Radioworks kevlar/dacron is rated at 770 lbs static load, which is approximately equal to the 3/16 dacron line they offer, and a bit less tha; /archives//html/Towertalk/2005-07/msg00819.html (7,358 bytes)
293. [TowerTalk] Baloon supported wires pattern (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Tue, 2 Aug 2005 10:45:32 -0400; elsewhere: Forget the models, small differences are meaningless. The antenna will seldom be vertical, due to wind. If it were me, I would make a full sized ground plane, with 4 radials, and have the; /archives//html/Towertalk/2005-08/msg00025.html (8,283 bytes)
294. [TowerTalk] Sparky & MOV's (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Wed, 3 Aug 2005 13:41:12 -0400; TT: In my experience, MOV's have a limited life. Some years ago, I was involved in testing MOV's to the IEEE discharge spec (long enough ago that I no longer recall the nomenclature). What we discove; /archives//html/Towertalk/2005-08/msg00058.html (8,029 bytes)
295. [TowerTalk] MOV's (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Wed, 3 Aug 2005 14:47:57 -0400; If an MOV has accumulated enough charge such that it is close to failure, and it fails open during an event, you are unprotected. And you have no way to know if you're in a condition which could go t; /archives//html/Towertalk/2005-08/msg00066.html (7,108 bytes)
296. [TowerTalk] MOV's (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Wed, 3 Aug 2005 17:59:01 -0400; I did some consulting work for a manufacturer of surge protection equipment, several years ago. We evaluated MOV's and their failure mechanisms, using Keytek surge generators (whom I represented at t; /archives//html/Towertalk/2005-08/msg00075.html (8,991 bytes)
297. [TowerTalk] guying preload (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Fri, 5 Aug 2005 07:59:03 -0400; From: "Gary Wescom" <wescom@leblink.com> Subject: [TowerTalk] Why preload guy lines? This question has been bugging me for a while. I've been trying to figure out why tower guys are preloaded. I have; /archives//html/Towertalk/2005-08/msg00108.html (8,106 bytes)
298. [TowerTalk] ferrite clip-ons & OCF dipoles (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Sun, 7 Aug 2005 11:31:32 -0400; OK...this to some degree repeats a thread from two years ago, but I'm looking for validation of my thinking on feedline treatment for an Off Center Fed dipole...in this case known as a Carolina Windo; /archives//html/Towertalk/2005-08/msg00144.html (8,518 bytes)
299. [TowerTalk] steppIR qsy time (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Sat, 13 Aug 2005 00:28:52 -0400; Interested to find out if any contesters using the SteppIR 3 element find that the QSY time between bands is too objectionable. I found out from SteppIR that from 20 to 15 the time is about 9 seconds; /archives//html/Towertalk/2005-08/msg00259.html (7,665 bytes)
300. [TowerTalk] winch loads and tower raising fixtures. (score: 1): Author: "Jim Jarvis" <jimjarvis@comcast.net>; Date: Fri, 19 Aug 2005 13:27:53 -0400; This started with Al Williams' question about winch ratings... was amplified by a mfr comment that a 1500 lb rated winch should do ok...and was commented on by Jim Lux, as follows: "And now you see w; /archives//html/Towertalk/2005-08/msg00413.html (9,276 bytes)

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