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81. [TowerTalk] scarecrows (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Tue, 25 Jul 2006 00:24:52 +0000; Somewhere in my archive, I have a picture of the previously mentioned blue heron, carrying a scarecrow away from my neighbor's koi pond in Pasadena, MD. Apparently it offended him...and it wasn't suf; /archives//html/Towertalk/2006-07/msg00743.html (6,911 bytes)
82. [TowerTalk] rohn foldover (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Wed, 26 Jul 2006 15:36:38 +0000; I made my original comments off-reflector, but perhaps it's worth summarizing: I had a 50' 45g foldover up in VT for several years. It was house bracketed below the fold, and unguyed. The bolts could; /archives//html/Towertalk/2006-07/msg00805.html (7,343 bytes)
83. [TowerTalk] concrete forms (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Mon, 31 Jul 2006 18:21:02 +0000; Adrian... Clive's comments are on-point. However, if you try to mix at the site, you will have to schlepp both bags of 'crete and water. It might be easier to mix below, and have a powered means to t; /archives//html/Towertalk/2006-07/msg00926.html (9,145 bytes)
84. [TowerTalk] 30m resonance.... (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Thu, 03 Aug 2006 13:54:09 +0000; Good heavens! What's so hard about 234/f(MHz)= .25 lambda? Double it for a dipole. Adjust from there for localized variables. Add 5% for an inv. vee. Add 5% for any elevated radials on a vertical. Tu; /archives//html/Towertalk/2006-08/msg00079.html (6,945 bytes)
85. Re: [TowerTalk] Topband: Grounded Tower (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Fri, 04 Aug 2006 16:22:24 -0400; Jim, you've opened a real can of worms. You can't say there is "data" to the contrary ... there may be legend, anecdote or even model studies but there are no validly conducted field strength studies; /archives//html/Towertalk/2006-08/msg00135.html (11,341 bytes)
86. [TowerTalk] elevated radials and rx antennas (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Tue, 08 Aug 2006 14:51:32 -0400; Dennis, The interaction between verticals and nearby receive antennas is well known, and not limited to those with elevated radials. In fact, any RX antenna within a few wavelengths of a TX antenna w; /archives//html/Towertalk/2006-08/msg00199.html (7,254 bytes)
87. Re: [TowerTalk] Ground resistance (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Wed, 09 Aug 2006 07:29:37 -0400; John asked: "Is there any simple way to measure the impedance of the ground radial system as you install them to know when you have enough of them in the ground?" Others suggested using a Megger or H; /archives//html/Towertalk/2006-08/msg00232.html (9,559 bytes)
88. Re: [TowerTalk] wierd antenna question (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Sat, 12 Aug 2006 12:14:19 -0400; ...this was the multiband fan dipole, one side of which fell across tower guy wires... snip " I still do not see how it could have been working so well with the driven side shorted out on the guy wir; /archives//html/Towertalk/2006-08/msg00327.html (7,526 bytes)
89. [TowerTalk] Towers/Antennas Near 138kV Transmission Lines (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Mon, 14 Aug 2006 18:16:46 -0400; Larry, Ignoring the question of noise from the high-line completely, I would be concerned about living within the EM field from the blasted thing. You need to research RF exposure and cancer. I've go; /archives//html/Towertalk/2006-08/msg00407.html (8,262 bytes)
90. [TowerTalk] Mast size for stacking (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Tue, 15 Aug 2006 04:20:37 -0400; Allen, Multiple questions here. 1) If you invest in a 4 el steppIR, you would be hard pressed to improve on it much with the monobander. Not that you wouldn't.. for an equal length boom, the monoband; /archives//html/Towertalk/2006-08/msg00429.html (8,346 bytes)
91. [TowerTalk] high tension lines and health (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Tue, 15 Aug 2006 16:27:11 -0400; TT: I'm sorry I raised this topic, frankly. Craig Clark is correct, there are no studies proving correlation between AC fields and any disease process. K6XN is correct, there are several ""post hoc e; /archives//html/Towertalk/2006-08/msg00460.html (8,115 bytes)
92. [TowerTalk] Hoot owl follow up (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Tue, 22 Aug 2006 17:41:54 -0400; My old sailboat racing partner bought one of those blinking eye plastic owls, to chase birds off his boat, and the dock at our old place in Maryland. It was last seen in the claws of the neighborhood; /archives//html/Towertalk/2006-08/msg00723.html (6,881 bytes)
93. [TowerTalk] F12 40 (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Thu, 24 Aug 2006 13:24:05 -0400; Maybe I'm being particularly dense today, but for the life of me, I cannot see how F12 can have a 40m resonance without also having a resonance at 21MHz. Unless they had a 21Mhz parallel resonant cir; /archives//html/Towertalk/2006-08/msg00793.html (6,858 bytes)
94. [TowerTalk] fixating on true north (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Mon, 28 Aug 2006 12:08:16 -0400; Gee, guys, this is another of those 'once a year' threads. The average 3 element beam has a half-power beamwidth of +/- 35 degrees. How closely do you really need to know where North is? How much eff; /archives//html/Towertalk/2006-08/msg00987.html (7,533 bytes)
95. [TowerTalk] Rohn 45 folding section (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Tue, 29 Aug 2006 23:25:08 -0400; Doc's prices for 45g aren't too high. And the folding section is underpriced, due to its need for repairs....even if they've been completed. All you need is another 100 buck winch from Grainger, and; /archives//html/Towertalk/2006-08/msg01088.html (6,913 bytes)
96. [TowerTalk] Cushcraft A3 center insulator (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Thu, 31 Aug 2006 17:02:41 -0400; Scotty, I had a new one kicking around in my garage, and finally threw it out, I think. But if I still have it, it's in the same storage tub as my rotor and coaxes. I'll check. You can have it for po; /archives//html/Towertalk/2006-08/msg01192.html (7,612 bytes)
97. Re: [TowerTalk] Cushcraft A3 center insulator (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Thu, 31 Aug 2006 17:53:20 -0400; Egad, Scotty, beam me up! OK...first, you DID get a quote, so I appologize. Second, although I value my time highly, if I can buy the tube for 8 bucks, and cut/drill in 15 minutes, it'd be worth mess; /archives//html/Towertalk/2006-08/msg01196.html (8,560 bytes)
98. [TowerTalk] Ernesto ate my windom (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Sat, 02 Sep 2006 11:21:01 -0400; TT: Apros pos of an earlier thread about how to put wires in trees, I espoused the 'keep it simple' approach, just laying the insulated wire and its support line, over the top of trees. Leave a littl; /archives//html/Towertalk/2006-09/msg00040.html (7,855 bytes)
99. Re: [TowerTalk] Ernesto ate my windom (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Sat, 02 Sep 2006 12:30:44 -0400; Jim (w9yc), et. al.: I don't know if it's 'flexweave' wire. The stuff I know as flexweave was actually woven. What I've been buying from RadioWorks is laid wire, 256 strand copperweld, with PE insula; /archives//html/Towertalk/2006-09/msg00046.html (8,290 bytes)
100. [TowerTalk] re; Ernesto ate my windom (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Sat, 02 Sep 2006 16:20:17 -0400; Martin, AA6E wrote: I've been using Flexweave (not sure of gauge) for a couple of years on a dipole. I had a failure after a wind storm where some tree branches had abraded the cable. I think this is; /archives//html/Towertalk/2006-09/msg00053.html (7,506 bytes)

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