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Total 896 documents matching your query.

201. Re: [TowerTalk] Mounting 10m/15m/20m monobanders -- single mast. (score: 1)
Author: k1ttt@arrl.net
Date: Tue, 5 Apr 2005 10:26:51 -0400 (EDT)
nope, multi-tower super stations just put up another tower. but before i got there i had 10/15/20m stacked the same way, just spread them out as far as i could on the 12' of mast above the tower. ju
/archives//html/Towertalk/2005-04/msg00167.html (8,443 bytes)

202. Re: [TowerTalk] Guying a self-supporting tower - NO (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sat, 9 Apr 2005 13:33:37 -0000
I would just bypass the whole guy wire question. Get some high strength copperweld and some strong insulators and put a couple of slopers down away from the power line. gets you more antennas and som
/archives//html/Towertalk/2005-04/msg00253.html (12,164 bytes)

203. Re: [TowerTalk] Guying a self-supporting tower - Yes (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sun, 10 Apr 2005 11:25:42 -0000
The only 'sensible' conclusions to this are the following: 1. do what the manufacturer says for 'standard' installations 2. do what a qualified mechanical engineer who has performed the analysis on t
/archives//html/Towertalk/2005-04/msg00306.html (10,527 bytes)

204. Re: [TowerTalk] Guying a self-supporting tower - Yes (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sun, 10 Apr 2005 17:35:04 -0000
I am good at the ridiculous.. just use the example of a very weak tube, like a cardboard paper towel tube. It will stand upright very nicely by itself... but then add a couple of strong cords pullin
/archives//html/Towertalk/2005-04/msg00319.html (11,586 bytes)

205. Re: [TowerTalk] Guying a self-supporting tower - Yes (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sun, 10 Apr 2005 18:21:38 -0000
Building a tower is not philosophy, nor is it science experiment. It is an engineering job. The mechanics and materials are well understood. the tools are readily available to engineers to do very s
/archives//html/Towertalk/2005-04/msg00323.html (11,300 bytes)

206. Re: [TowerTalk] M2 monobander -- 20M4DX (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sat, 30 Apr 2005 11:00:32 -0000
I've got a stack of 5 of them up here, they work fine and have held up ok for a couple winters now. Like all the m2 antennas there are lots of parts and they take time to assemble, but if you follow
/archives//html/Towertalk/2005-04/msg00789.html (8,594 bytes)

207. Re: [TowerTalk] A question of newbie proportions. (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sat, 7 May 2005 11:04:28 -0000
First you need to back up a bit.. a 'tower' normally holds up an antenna. The antenna does the radiating. Because of the low frequency of AM broadcast in most cases they don't use a tower because the
/archives//html/Towertalk/2005-05/msg00155.html (10,345 bytes)

208. Re: [TowerTalk] Yagi antenna fundamentals (score: 1)
Author: k1ttt@arrl.net
Date: Mon, 9 May 2005 14:21:24 -0400 (EDT)
the 'appearance' of what they do is the reason for the names. the how is the harder part. because the elements are different lengths it affects both the phase and the magnitude of the current on the
/archives//html/Towertalk/2005-05/msg00202.html (11,037 bytes)

209. Re: [TowerTalk] Rotor (score: 1)
Author: k1ttt@arrl.net
Date: Thu, 12 May 2005 12:37:08 -0400 (EDT)
a pro67 on a g800??? thats a big antenna for that poor little rotor. i wouldn't try an antenna of that size on anything smaller than a g2700. maybe you could try a g2800 if your tower won't fit a 270
/archives//html/Towertalk/2005-05/msg00275.html (9,123 bytes)

210. [TowerTalk] Web page update (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sat, 14 May 2005 17:06:31 -0000
Ever wonder how to assemble and balance a large antenna? I just put up a new addition to my tech notes with pictures of my method. http://www.k1ttt.net/technote/bigantenna.html David Robbins K1TTT e-
/archives//html/Towertalk/2005-05/msg00366.html (7,607 bytes)

211. Re: [TowerTalk] Amplifier Recommendation (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sun, 15 May 2005 13:38:02 -0000
Sell all 3 and buy a new commander hf-2500 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/2005-05/msg00397.html (9,051 bytes)

212. Re: [TowerTalk] amps (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sun, 15 May 2005 18:49:16 -0000
I had a 3 hole alpha 76 that lasted almost 20 years on the original tubes. I think they were getting soft when I finally sold it, but it would still do 1500w on 160m. David Robbins K1TTT e-mail: mail
/archives//html/Towertalk/2005-05/msg00408.html (8,028 bytes)

213. Re: [TowerTalk] measuring and using the term impedance (score: 1)
Author: k1ttt@arrl.net
Date: Mon, 16 May 2005 07:10:39 -0400 (EDT)
the 259 provides the full complex impedance if i remember right. by only reporting the real part you are leaving off half the story. to better analyze what is happening you need to record and report
/archives//html/Towertalk/2005-05/msg00423.html (7,826 bytes)

214. [TowerTalk] insulators (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 27 May 2005 21:31:05 -0000
Where I am working (at least for the next week) they are cleaning house and are about to trash tons of big insulators. I grabbed a couple interesting ones to see if I could find a use for them. Anyon
/archives//html/Towertalk/2005-05/msg00681.html (7,703 bytes)

215. Re: [TowerTalk] insulators "Applications" (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sat, 28 May 2005 01:21:48 -0000
Now that's the best idea I've heard yet. For those who are asking about these things, the ones pictured are about 14" in diameter and 10-12" tall and weigh about 20# each. One is marked as '18000# t
/archives//html/Towertalk/2005-05/msg00688.html (9,033 bytes)

216. Re: [TowerTalk] insulators "Applications" (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sat, 28 May 2005 01:48:54 -0000
Not if this item is an indicator: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=795&item=6181216329&r d=1 these are not the rare telegraph insulators from the 1890's or so. These are more li
/archives//html/Towertalk/2005-05/msg00694.html (11,975 bytes)

217. Re: [TowerTalk] Securing the cables to the tower? (score: 1)
Author: k1ttt@arrl.net
Date: Thu, 2 Jun 2005 08:31:22 -0400 (EDT)
i'm sure you'll get lots of fancy arrangements with tie wraps, cover them with tape, chinese finger traps, loops of copper wire, etc. just buy some cheap electrical tape (not scotch, get store brand
/archives//html/Towertalk/2005-06/msg00054.html (9,537 bytes)

218. Re: [TowerTalk] Custom Torque Arms For Rohn 55G (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 3 Jun 2005 20:48:22 -0000
Are you talking about the 'star' guy like the one in the second picture down on this page: http://www.k1ttt.net/180.html David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR
/archives//html/Towertalk/2005-06/msg00094.html (9,708 bytes)

219. Re: [TowerTalk] Using 75 Ohm Hardline (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sun, 5 Jun 2005 11:03:02 -0000
First, forget the impedance mismatch, for hf use it is absolutely insignificant. Then follow the comments some others have made about using plumbing fittings to make your own connectors, cover them w
/archives//html/Towertalk/2005-06/msg00114.html (9,824 bytes)

220. Re: [TowerTalk] Some ebay humor (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Tue, 7 Jun 2005 10:45:02 -0000
The 1:5 swr in intriguing. Unfortunately the guys running these may need something rated for that power: http://www.davemade.com/mobile.htm if they use them as a base instead of mobile. David Robbins
/archives//html/Towertalk/2005-06/msg00184.html (9,017 bytes)


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