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Total 282 documents matching your query.

21. Re: [TowerTalk] 160/80m Inverted L dualband design (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Wed, 2 Jul 2008 13:12:46 -0500
why bother with a trap--it will only quit working eventually. Why not simply run two wires spaced apart, one about 1/4 w. on 160 and the other half that length for 80, an inverted L version of the fa
/archives//html/Towertalk/2008-07/msg00047.html (7,501 bytes)

22. Re: [TowerTalk] What is..."Pointed Tower vs Flat" (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Fri, 11 Jul 2008 11:01:10 -0500
You will see short towers with a taper base in circumstances where the tower is out in the open in a windy area and even though short, is holding a high wind load. An example is a short tower out in
/archives//html/Towertalk/2008-07/msg00305.html (8,135 bytes)

23. Re: [TowerTalk] making air wound coils (was Johnson Matchbox coil) (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Sun, 27 Jul 2008 17:59:16 -0500
One of the ham magazines, either CQ or QST (but I'm pretty sure it was CQ) had a good article with photos a month or three ago on how to make your own air wound coils, including how to fabricate the
/archives//html/Towertalk/2008-07/msg00714.html (7,162 bytes)

24. Re: [TowerTalk] making air wound coils (was Johnson Matchbox coil) (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Sun, 27 Jul 2008 21:53:34 -0500
It turns out the article I mentioned was in two parts in the May and June 2008 issues of CQ. It is "Build Your Own Air-Wound Coils" by Phil Salas AD5X and is in the Weekender column in those two issu
/archives//html/Towertalk/2008-07/msg00728.html (9,959 bytes)

25. Re: [TowerTalk] Long Barrel Connectors - The post is short the connector (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Fri, 8 Aug 2008 12:53:18 -0500
two questions: 1. If you don't want "funky UHF," (and I can understand why you would not like UHF) why don't you say what you DO want? N? DIN?.....? 2. You say you want a barrel but let's be careful
/archives//html/Towertalk/2008-08/msg00177.html (7,234 bytes)

26. Re: [TowerTalk] ground radial length vs antenna height? (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Wed, 27 Aug 2008 18:26:04 -0500
I remember reading the K3LC paper when it came out. He did a good job with his research, modeling and plots and added yet another way of looking at the ground system picture. On thinking about it som
/archives//html/Towertalk/2008-08/msg00548.html (9,877 bytes)

27. Re: [TowerTalk] Splicing LDF4 (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Wed, 27 Aug 2008 18:37:00 -0500
Those aren't hard or easy ways; they are wrong ways, especially if the splice is outside where you will eventually have problems due to condensation and possible water penetration. The dielectric is
/archives//html/Towertalk/2008-08/msg00549.html (8,093 bytes)

28. Re: [TowerTalk] Splicing LDF4 (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Fri, 29 Aug 2008 12:14:23 -0500
It's because some hams get a kick out of trying to save a few bucks, even if it costs more time and money in the long run than doing it right would have from the beginning. But anyway, a makeshift sp
/archives//html/Towertalk/2008-08/msg00609.html (9,463 bytes)

29. Re: [TowerTalk] More Inverted L Information from My Setup (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Fri, 29 Aug 2008 21:03:16 -0500
In addition to the other questions, I'd like to know the range of the air variable cap you are using. A range of around 20 to 40 pF at the low end and 400 to 500 pF at the high end is good. Of course
/archives//html/Towertalk/2008-08/msg00642.html (8,344 bytes)

30. Re: [TowerTalk] Insulated tower spark gap (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Mon, 6 Oct 2008 11:08:01 -0500
when it comes to insulated hot towers (or other constructions of verticals over ground systems) I always figure it doesn't hurt to see how commercial towers are done to get some ideas: http://www.amg
/archives//html/Towertalk/2008-10/msg00085.html (7,409 bytes)

31. [TowerTalk] Metals prices drop through floor (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Fri, 24 Oct 2008 15:01:31 -0500
The recent world financial crisis has resulted in a dramatic slowdown in construction projects world-wide. Motor vehicle sales have dropped causing a production slowdown and these two factors have de
/archives//html/Towertalk/2008-10/msg00465.html (7,829 bytes)

32. [TowerTalk] Max height of aluminum tubing mast? (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Tue, 18 Nov 2008 10:41:00 -0600
I think you're going to find out that for the height you want, your tubing will prove to be too skinny and rickety. I'd start out with a bottom diameter of 4 or at least three inches. I'd work out a
/archives//html/Towertalk/2008-11/msg00454.html (8,272 bytes)

33. [TowerTalk] Push Up Mast Guying and loading (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Tue, 18 Nov 2008 12:41:58 -0600
Dave, I think you say you can go out 10 feet. I take that to mean you can put your guy anchors out no farther than ten feet from the masts which are 40 feet tall. That's not far enough. The guys will
/archives//html/Towertalk/2008-11/msg00458.html (7,681 bytes)

34. Re: [TowerTalk] 43ft Vertical Feeding Question and Balun type, (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Thu, 20 Nov 2008 11:49:33 -0600
I've wondered before what the deal is with 43 foot verticals. By that I mean, it seems suddenly I started seeing 43 feet mentioned all over the place for an "all band vertical." Is 43 feet some magic
/archives//html/Towertalk/2008-11/msg00498.html (7,948 bytes)

35. Re: [TowerTalk] 43ft Vertical Feeding Question and Balun type (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Thu, 20 Nov 2008 17:23:57 -0600
Frank, Thanks; I get it now. 73 rob / k5uj <<<Rob, A 43 foot vertical is 5/8 wavelength on 20 meters. With appropriate radial and matching systems it can be an excellent antenna on 80 through 20 mete
/archives//html/Towertalk/2008-11/msg00504.html (8,686 bytes)

36. [TowerTalk] Force 12 80M Sigma vertical problem (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Thu, 20 Nov 2008 18:46:57 -0600
I have never used any F12 antennas but from your description, it sounds like this one is: a vertically polarized off center dipole loaded in two ways--coils and horizontal rods perpendicular to the e
/archives//html/Towertalk/2008-11/msg00509.html (8,268 bytes)

37. Re: [TowerTalk] Was "43ft Vertical Feeding Question and Balun Type" (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Sun, 23 Nov 2008 19:45:39 -0600
Ah, you evidently missed the relatively brief period of a few years during which John Bliss was making his revered Bliss Matchmasters. I say this in the past tense because I just googled and looked a
/archives//html/Towertalk/2008-11/msg00617.html (11,122 bytes)

38. [TowerTalk] KFI's La Mirada main tower back up at last (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Fri, 28 Nov 2008 16:18:46 -0600
After the first 300 feet of Magnum tower came down in March following a construction accident, the tower rebuild began again a few weeks ago at KFI Los Angeles's La Mirada tx site, with new 7 foot fa
/archives//html/Towertalk/2008-11/msg00754.html (7,271 bytes)

39. Re: [TowerTalk] Survey (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Fri, 28 Nov 2008 17:35:53 -0600
I'm sorry Lee; I can't answer because in its current form your survey is not well thought out. For one thing, you should include the band(s) you are interested in. Obviously an antenna for 160 m. is
/archives//html/Towertalk/2008-11/msg00763.html (9,114 bytes)

40. Re: [TowerTalk] Trivial question re Rohn towers used as radiating elements (score: 1)
Author: "Rob Atkinson" <ranchorobbo@gmail.com>
Date: Wed, 3 Dec 2008 12:03:38 -0600
AM broadcast towers are usually at least ~150 to 160 feet tall (1/4 w/l at the top of the bc band) and have leg ends that have flanges. At the flanges where two sections meet and are bolted together
/archives//html/Towertalk/2008-12/msg00055.html (7,920 bytes)


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