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Total 896 documents matching your query.

341. Re: [TowerTalk] copper pipe for ground (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Wed, 12 Jul 2006 21:07:21 -0000
Depends, if you are taking a shower at the time you might have a shocking experience! David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 145.69MHz or telnet:
/archives//html/Towertalk/2006-07/msg00398.html (8,521 bytes)

342. Re: [TowerTalk] Insulating Towers (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Mon, 17 Jul 2006 20:03:06 -0000
Yeah, insulated bushings, or some kind of insulated stud, whatever, anything like that which is strong enough to handle the tilt over forces will insulate the base of the tower. The worse part it wha
/archives//html/Towertalk/2006-07/msg00604.html (9,644 bytes)

343. Re: [TowerTalk] An alternative approach to safety climbing (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Mon, 17 Jul 2006 20:15:39 -0000
If its climbable and has some kind of horizontal members you can hook the carabineers to then climb it with standard safety harness and belts/arrest lines. no need for live working rated rope or hard
/archives//html/Towertalk/2006-07/msg00607.html (12,518 bytes)

344. Re: [TowerTalk] RFI Radius vs Ant Height (score: 1)
Author: k1ttt@arrl.net
Date: Thu, 3 Aug 2006 07:38:14 -0400 (EDT)
A very important step in starting operation in a place like this is to put up the tower and antenna... but NOT connect the feedline for at least a week. That will give you a chance to find out who ha
/archives//html/Towertalk/2006-08/msg00071.html (11,320 bytes)

345. Re: [TowerTalk] Yaesu Rotor G-2800 SDX (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Thu, 3 Aug 2006 21:45:51 -0000
I used g-2800's with 6 element 20m telrex and 8 element 15m telrex monsters. These were the 48' boom 150# ones and they held up fine here in the wind and ice. David Robbins K1TTT e-mail: mailto:k1ttt
/archives//html/Towertalk/2006-08/msg00102.html (8,808 bytes)

346. Re: [TowerTalk] Connectors for 3/4 in. CATV Hardline (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Tue, 8 Aug 2006 21:25:01 -0000
The local hardware store stocks all I need to make my own for 1/2, 5/8, 3/4, and some larger hardlines. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Cluster node: 14
/archives//html/Towertalk/2006-08/msg00208.html (8,848 bytes)

347. Re: [TowerTalk] Ground Resistance (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Tue, 8 Aug 2006 22:25:38 -0000
Way, yes... simple, not really. There are meters made for measuring ground system resistance, but they rely on either a very good reference ground nearby, or a couple of rods spaced the right distanc
/archives//html/Towertalk/2006-08/msg00211.html (9,248 bytes)

348. Re: [TowerTalk] Comtek 4sq box question (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sun, 20 Aug 2006 19:01:44 -0000
That is probably because the actual loads on those ports are not 50 ohms, they are something else, likely with a reactive component also. Following the comtek procedure... you initially adjust a sing
/archives//html/Towertalk/2006-08/msg00653.html (9,569 bytes)

349. Re: [TowerTalk] TOWER MAST - WHAT DO YOU THINK IS BEST (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Thu, 24 Aug 2006 20:46:46 -0000
Depends on the size of the beam and the length of the mast and how much you want to pay.... personally I use either 1/2" wall aluminum or 1/4" wall steel. David Robbins K1TTT e-mail: mailto:k1ttt@arr
/archives//html/Towertalk/2006-08/msg00809.html (8,467 bytes)

350. Re: [TowerTalk] ham4 into 25g?? (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sat, 2 Sep 2006 22:56:42 -0000
I think it was a ham 4 I did that with once, turn and twist and pry a bit, but it finally slipped through. It may be easier to take out the rotor plate, put the rotor in at the next joint down and br
/archives//html/Towertalk/2006-09/msg00063.html (10,772 bytes)

351. Re: [TowerTalk] ham4 into 25g?? (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sat, 2 Sep 2006 22:59:52 -0000
Half way down the top section is only 4' or 5' depending on the section. That's hardly enough to wind up much unless its rubber. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1tt
/archives//html/Towertalk/2006-09/msg00064.html (10,622 bytes)

352. Re: [TowerTalk] Soil resistivity test done: Some questions (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sat, 9 Sep 2006 16:46:56 -0000
'Resistivity' or 'Resistance'?? I am confused by the wording of some of your measurements... and since you don't give units I have to assume certain things. Note that 'resistance' is measured in ohms
/archives//html/Towertalk/2006-09/msg00337.html (13,434 bytes)

353. Re: [TowerTalk] Soil resistivity test done: Some questions (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sat, 9 Sep 2006 19:49:17 -0000
Actually ohm-m or ohm-cm is correct, a couple definitions that make it clearer: resistivity-(Also called specific resistance.) The electrical resistance per unit length and per unit reciprocal cross-
/archives//html/Towertalk/2006-09/msg00341.html (10,231 bytes)

354. Re: [TowerTalk] Soil resistivity test done: Some questions (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sun, 10 Sep 2006 11:08:46 -0000
The BIG point you are missing is that grounding is far from an exact science. The ground resistivity can vary quite a bit over a small area, and also with depth. Driving one rod that happens to hit s
/archives//html/Towertalk/2006-09/msg00354.html (11,085 bytes)

355. Re: [TowerTalk] Tic ring feeline (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Mon, 11 Sep 2006 21:01:56 -0000
There are 2 ways I have used. The most common is to run the line up the tower to the height of the boom brace struts, then loop it down and back up to the strut and then down the strut to the beam. T
/archives//html/Towertalk/2006-09/msg00388.html (9,144 bytes)

356. Re: [TowerTalk] Tic ring feeline (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Mon, 11 Sep 2006 23:06:01 -0000
That may work, you just have to be sure that the coax can't sag down to get caught in the ring movement bearings or drive. Since you don't need a boom strut for support maybe just make a 3' or so ver
/archives//html/Towertalk/2006-09/msg00399.html (11,801 bytes)

357. Re: [TowerTalk] Tower mast.. (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Mon, 18 Sep 2006 23:24:04 -0000
I want to know why all these questions about rotors at the base of the tower? For any decent sized tower the extra weight, assembly work, expense of the pipe and proper fittings, thrust bearings, jus
/archives//html/Towertalk/2006-09/msg00663.html (9,759 bytes)

358. Re: [TowerTalk] (no subject) (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Fri, 13 Oct 2006 17:58:36 -0000
Oh, its not THAT bad... I had 48' verticals for an 80m 4-square made out of chain link fence galvanized top rail. They lasted in the ice and wind up here for several years just fine. David Robbins K1
/archives//html/Towertalk/2006-10/msg00384.html (9,822 bytes)

359. Re: [TowerTalk] Tram Antenna Balancing (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Wed, 18 Oct 2006 20:07:28 -0000
I sent this to one of you guys who just asked, but I think it went only to you not to the list. In any case the easy solution is to put the tram wire above the antenna, put a pulley on it, and hang t
/archives//html/Towertalk/2006-10/msg00494.html (10,455 bytes)

360. Re: [TowerTalk] tower farms (score: 1)
Author: "David Robbins K1TTT" <k1ttt@arrl.net>
Date: Sat, 21 Oct 2006 12:40:02 -0000
If no one has posted it yet, check out the hf contest station database at: http://www.pvrc.org/wcsd/wcsdsearch.htm David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://www.k1ttt.net AR-Clust
/archives//html/Towertalk/2006-10/msg00612.html (8,050 bytes)


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