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Total 896 documents matching your query.

181. Re: [TowerTalk] WB2ZTH George 888 !!ENOUGH!! (score: 1)
Author: k1ttt@arrl.net
Date: Thu, 3 Mar 2005 07:50:10 -0500 (EST)
STOP THE PRESSES! george can't do anything as you have to have the address in order to add or remove it from most mailing lists. so even if you did get in touch with him he couldn't help at this poin
/archives//html/Towertalk/2005-03/msg00088.html (8,457 bytes)

182. Re: [TowerTalk] amplifiers for phased arrays (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 4 Mar 2005 14:39:13 -0000
Another requirement must be repeatable or adjustable phase and power control. unless you are planning to have an output sample feedback to your phase shift and power divider network to compensate for
/archives//html/Towertalk/2005-03/msg00094.html (10,326 bytes)

183. Re: [TowerTalk] about four square antenna (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 4 Mar 2005 19:45:14 -0000
You would have to provide a schematic, there are many different matching network designs and the formulas would be specific for the network you are using. David Robbins K1TTT e-mail: mailto:k1ttt@arr
/archives//html/Towertalk/2005-03/msg00112.html (8,417 bytes)

184. Re: [TowerTalk] Computer control antenna switch (score: 1)
Author: k1ttt@arrl.net
Date: Wed, 9 Mar 2005 10:58:05 -0500 (EST)
check out this system: http://www.ab5k.net/AntennaController.aspx _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Statio
/archives//html/Towertalk/2005-03/msg00181.html (8,197 bytes)

185. Re: [TowerTalk] Yaesu connector (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Tue, 15 Mar 2005 00:09:28 -0000
Where do they use an 8 pin one?? is that something new? I just happen to have two of each of the 6 pin ones, the 6 pin 'jones' connector for the control box and the 6 pin round screw in one for the r
/archives//html/Towertalk/2005-03/msg00297.html (10,132 bytes)

186. Re: [TowerTalk] Porqupines (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 18 Mar 2005 19:07:40 -0000
They are supposed to prevent lightning hits. Just think about this though, if porcupines dissipated enough charge to prevent lightning why would lightning EVER hit a pine tree that has many more shar
/archives//html/Towertalk/2005-03/msg00563.html (9,430 bytes)

187. Re: [TowerTalk] Porqupines (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 18 Mar 2005 20:35:54 -0000
And what would happen if you could 'siphon off' enough charge? The manufacturers of those things say the prevent strikes by either bleeding off enough charge to prevent the streamer or ionizing enoug
/archives//html/Towertalk/2005-03/msg00572.html (10,825 bytes)

188. Re: [TowerTalk] Porcupines (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 18 Mar 2005 21:51:01 -0000
http://lists.contesting.com/archives//html/Towertalk/2004-03/msg00380.html btw, as to my qualifications: I work for the Electric Power Research Institute at their high voltage lab in Lenox, Ma that
/archives//html/Towertalk/2005-03/msg00582.html (16,756 bytes)

189. Re: [TowerTalk] Porqupines (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 18 Mar 2005 21:53:29 -0000
Yeah, except you don't have to align it with true north for it to not work. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet://dxc.k1t
/archives//html/Towertalk/2005-03/msg00583.html (8,465 bytes)

190. Re: [TowerTalk] Porcupines (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 18 Mar 2005 22:43:26 -0000
Nope, can't pull that one on me. We do research and consulting, not hardware and installations. We never would advise anyone to invest their money on porcupines though. David Robbins K1TTT e-mail: ma
/archives//html/Towertalk/2005-03/msg00589.html (12,522 bytes)

191. Re: [TowerTalk] Porqupines (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 18 Mar 2005 22:45:13 -0000
As has been pointed out aircraft present a different problem than ground mounted structures. The ability of a small static drain to work on a relatively small insulated object is completely different
/archives//html/Towertalk/2005-03/msg00590.html (11,413 bytes)

192. Re: [TowerTalk] Porqupines (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 18 Mar 2005 22:47:46 -0000
Of course not, they understand the difference. It does include bc hydro, nasa, usaf, faa, nrl, and others. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node:
/archives//html/Towertalk/2005-03/msg00591.html (11,311 bytes)

193. Re: [TowerTalk] static bleed & lightning discharge (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 18 Mar 2005 22:56:34 -0000
The concept behind the conventional 'franklin' lightning rod is to provide a preferred point for the lightning to hit and a good path to ground from there. The pointed rods provide that sharp point f
/archives//html/Towertalk/2005-03/msg00593.html (13,724 bytes)

194. Re: [TowerTalk] porcupines and chemical ground (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sat, 19 Mar 2005 18:23:40 -0000
Chemically enhanced grounds are good for power line safety grounding, but are of questionable use at rf and hence lightning related frequencies. The problem is that the added conductivity is in a rat
/archives//html/Towertalk/2005-03/msg00636.html (19,620 bytes)

195. Re: [TowerTalk] Porqupines (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sun, 20 Mar 2005 00:37:44 -0000
please cite peer reviewed sources that have proof. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net __________________
/archives//html/Towertalk/2005-03/msg00648.html (9,713 bytes)

196. Re: [TowerTalk] BC Antenna + Radials (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sun, 20 Mar 2005 11:52:27 -0000
no, it doesn't eliminate RF, it just equalizes the voltage between the ground and the fence. This prevents what power utilities call 'step' or 'touch' potential. by making the voltages the same some
/archives//html/Towertalk/2005-03/msg00662.html (7,735 bytes)

197. Re: [TowerTalk] A3 (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Thu, 24 Mar 2005 00:12:42 -0000
First you need to sober up and read the meter... is it 1.3:1?? That would be good. Or is it 1:3? If so, you are standing on your head, please turn the meter over and read again. Or is it 3:1?? And i
/archives//html/Towertalk/2005-03/msg00776.html (8,025 bytes)

198. Re: [TowerTalk] A3S (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 25 Mar 2005 12:05:47 -0000
The lowest frequency band is tuned by the outer tips on the elements which makes adjusting it the easiest one. if the swr is low enough but at too high a frequency on 20m just lengthen the driven ele
/archives//html/Towertalk/2005-03/msg00804.html (9,870 bytes)

199. Re: [TowerTalk] Relay Specs - Coax switch (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Thu, 31 Mar 2005 21:50:42 -0000
The type of amp has nothing to do with it. Just calculate the max peak voltage for 1500w in 50ohm coax with whatever the highest swr you expect to handle would be.... then add a safety factor. David
/archives//html/Towertalk/2005-03/msg00980.html (9,264 bytes)

200. Re: [TowerTalk] When a Yagi Loses an Element (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sun, 3 Apr 2005 14:46:29 -0000
Tough one. unbalanced antennas like that are very hard to handle. If you can get a pulley on the mast above it you can run a lifting line out as far as you can reach on the heavy side to help take th
/archives//html/Towertalk/2005-04/msg00085.html (10,979 bytes)

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