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Total 950 documents matching your query.

361. Re: [TowerTalk] 80-m. Inverted Vee vs. Dipole Performance (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Wed, 15 Sep 2010 23:47:42 -0700
As I stated, there are valid points of view on both sides of this discussion. Some folks simply want to get on the air and chat, and if a piece of wire draped over the couch works they're happy. Othe
/archives//html/Towertalk/2010-09/msg00374.html (11,037 bytes)

362. Re: [TowerTalk] 80-m. Inverted Vee vs. Dipole Performance (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Thu, 16 Sep 2010 10:43:41 -0700
I'll echo those comments 100%. Lately I've been trying to monitor arrival angles by feeding the signals from two different horizontally polarized antennas on my tower into the two identical receivers
/archives//html/Towertalk/2010-09/msg00386.html (13,360 bytes)

363. Re: [TowerTalk] 80-m. Inverted Vee vs. Dipole Performance (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Thu, 16 Sep 2010 12:44:19 -0700
That's a good observation. Although both antennas (an Optibeam OB2-40 and an OB16-3) have all their elements isolated from the boom, I do have the shields of all my coax runs grounded to both the top
/archives//html/Towertalk/2010-09/msg00401.html (18,056 bytes)

364. Re: [TowerTalk] 80-m. Inverted Vee vs. Dipole Performance (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Thu, 16 Sep 2010 12:44:40 -0700
That's a good observation. Although both antennas (an Optibeam OB2-40 and an OB16-3) have all their elements isolated from the boom, I do have the shields of all my coax runs grounded to both the top
/archives//html/Towertalk/2010-09/msg00402.html (10,683 bytes)

365. Re: [TowerTalk] 80-m. Inverted Vee vs. Dipole Performance (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Thu, 16 Sep 2010 12:42:13 -0700
That's a good obsrvation. Although both antennas (an Optibeam OB2-40 and an OB16-3) have all their elements isolated from the boom, I do have the shields of all my coax runs grounded to both the top
/archives//html/Towertalk/2010-09/msg00403.html (17,773 bytes)

366. Re: [TowerTalk] Newbee concrete rebar questions (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Thu, 16 Sep 2010 12:56:56 -0700
Personally, I think it is highly unlikely that significant corrosion would travel down the path of a thin wire. It certainly isn't a moisture issue, since moisture readily penetrates concrete anyway.
/archives//html/Towertalk/2010-09/msg00405.html (10,707 bytes)

367. Re: [TowerTalk] Newbee concrete rebar questions (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Thu, 16 Sep 2010 12:56:29 -0700
Personally, I think it is highly unlikely that significant corrosion would travel down the path of a thin wire. It certainly isn't a moisture issue, since moisture readily penetrates concrete anyway.
/archives//html/Towertalk/2010-09/msg00406.html (11,199 bytes)

368. Re: [TowerTalk] free climbing a 1700`tower (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Sat, 18 Sep 2010 09:56:24 -0700
While I agree that being in good physical shape helps reduce (but doesn't prevent) mistakes from being tired, it doesn't do anything to minimize mistakes from being distracted or being affected by fo
/archives//html/Towertalk/2010-09/msg00465.html (9,192 bytes)

369. Re: [TowerTalk] free climbing a 1700`tower (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Sat, 18 Sep 2010 12:05:28 -0700
Doug, I didn't intentionally change what you said, but I'm having a difficult time understanding the distinction since if someone can't physically climb a tower at all none of this discussion applies
/archives//html/Towertalk/2010-09/msg00470.html (10,721 bytes)

370. Re: [TowerTalk] How to support a large loop? (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Wed, 22 Sep 2010 11:43:22 -0700
I totally agree. I just don't think it makes sense to run any kind of antenna wire through a pulley. In order for anything braided to be flexible, its strands have to rub across each other to make a
/archives//html/Towertalk/2010-09/msg00572.html (9,577 bytes)

371. Re: [TowerTalk] Re-bar Cage - welding ?? (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Wed, 22 Sep 2010 13:19:14 -0700
From Wikipedia: ** "The American Welding Society (AWS) D 1.4 sets out the practices for welding rebar in the U.S. Without special consideration the only rebar that is ready to weld is /W grade/ (Low-
/archives//html/Towertalk/2010-09/msg00578.html (10,523 bytes)

372. Re: [TowerTalk] Tower Permitting (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Sat, 25 Sep 2010 11:01:22 -0700
Guess you skipped your high school civics and economics classes. Sorry to have to tell you this, but virtually all of those regulations and codes you mention in your tirade were not the direct result
/archives//html/Towertalk/2010-09/msg00636.html (10,308 bytes)

373. Re: [TowerTalk] SteppIR vertical (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Mon, 27 Sep 2010 12:57:43 -0700
I totally agree. Don't seal holes, especially if the housing is plastic. Virtually any commonly used plastic is non-hermetic to individual water molecules, and internal condensation over time (change
/archives//html/Towertalk/2010-09/msg00675.html (11,359 bytes)

374. Re: [TowerTalk] SteppIR vertical (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Mon, 27 Sep 2010 13:47:24 -0700
I used to be an engineer, and later an operations manager, for one of the largest manufacturers of semiconductors in the world. Most of our components were plastic encapsulated with materials far mor
/archives//html/Towertalk/2010-09/msg00683.html (10,177 bytes)

375. Re: [TowerTalk] has anybody had a live contact with Idiom Press lately? (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Mon, 27 Sep 2010 15:03:55 -0700
With all of the bad press they've gotten here on TowerTalk and also on eHam for the last three years running at least, I'm amazed they haven't cleaned up their act. Needlessly irritating your custome
/archives//html/Towertalk/2010-09/msg00689.html (8,953 bytes)

376. Re: [TowerTalk] Impedance matching dilemma - 80M Inverted L (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Sat, 02 Oct 2010 08:50:42 -0700
TLW, the free software included with every recent edition of the ARRL Antenna Book, will quickly and easily do exactly what you want. 73, Dave AB7E _______________________________________________ ___
/archives//html/Towertalk/2010-10/msg00011.html (9,165 bytes)

377. Re: [TowerTalk] Tower Detuning (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Tue, 05 Oct 2010 10:10:44 -0700
I agree ... one turn through a core is insufficient on 160m. Using clamp-ons can be useful in other semi-similar situations, though. A couple of years ago afriend of mine, K9RX, was having significan
/archives//html/Towertalk/2010-10/msg00029.html (8,403 bytes)

378. Re: [TowerTalk] Tower Detuning (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Tue, 05 Oct 2010 12:59:37 -0700
Well, as Jim pointed out (and as I should have) the operating frequency was much higher (12 to 15 times higher), and we used three clamp-ons instead of one. To a first order approximation (I didn't l
/archives//html/Towertalk/2010-10/msg00033.html (12,051 bytes)

379. Re: [TowerTalk] TowerTalk Digest, Vol 94, Issue 20 (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Thu, 14 Oct 2010 09:18:59 -0700
That's a very bad idea. Water causes motor oil to eventually break down into acidic compounds, which is one of the reasons you periodically change it in your vehicles. Check out what happens to the o
/archives//html/Towertalk/2010-10/msg00137.html (8,926 bytes)

380. Re: [TowerTalk] Protecting Fiberglass Antennas Parts (score: 1)
Author: David Gilbert <xdavid@cis-broadband.com>
Date: Thu, 14 Oct 2010 09:24:49 -0700
Spar varnish won't hold up indefinitely to intense sun either, at least not here in Arizona. In my opinion, a good quality exterior grade latex paint would be a better choice. The surface will slowly
/archives//html/Towertalk/2010-10/msg00139.html (8,760 bytes)


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