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61. Re: [TowerTalk] MACAntenna (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 20 May 2009 11:00:33 -0400
ladder line forms an element while the other ladder line conductor is used to complete the relay return path. I could see this as a good alternative to something like the SteppIR if there was some m
/archives//html/Towertalk/2009-05/msg00381.html (8,929 bytes)

62. Re: [TowerTalk] ladder line (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 28 May 2009 08:24:50 -0400
Van, On open line, I use a pair of Jennings SPST vacuum relays located a short distance from the house and remoted back to the shack. The relays form an "automatic knife switch" and are powered from
/archives//html/Towertalk/2009-05/msg00508.html (7,339 bytes)

63. Re: [TowerTalk] ladder line (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 28 May 2009 10:23:55 -0400
Obviously, there are no guarantees with lightning since it travels through air a distance of a mile or more before ultimate damage results. Still, the opening of both sides of the line may be enough
/archives//html/Towertalk/2009-05/msg00510.html (8,951 bytes)

64. Re: [TowerTalk] optimum vertical length (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 1 Jun 2009 09:26:17 -0400
Seems to me the 43-foot verticals are reasonably good for operation between 40M-20M where the lobes are contained to low angles and where the antenna can achieve good radiation efficiency without to
/archives//html/Towertalk/2009-06/msg00005.html (8,549 bytes)

65. Re: [TowerTalk] re-visit W3CRA's old QTH - - Aaaaaarrrrrgh! (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 14 Sep 2009 09:11:49 -0400
What's interesting about W4ZV's analysis is that one antenna, strategically placed on the side of a sloping hill for a distance of about one mile, is on par with, or better than multiple stacks over
/archives//html/Towertalk/2009-09/msg00201.html (8,025 bytes)

66. [TowerTalk] Al Hix - W8AH (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 15 Sep 2009 06:37:29 -0400
Does anyone recall the type of antenna Al Hix, W8AH (SK) was using on 40m? Monster signal always into North Florida and he had an uncanny ability to perfectly time his call in a pile-up. Private repl
/archives//html/Towertalk/2009-09/msg00232.html (6,531 bytes)

67. Re: [TowerTalk] Best choice for AC Service Entrance TVSS? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 16 Sep 2009 14:47:56 -0400
Here's one counter-opinion on the matter: http://morristechinc.com/Failure%20of%20SADs%20in%20TVSS%20Applications.pdf I use a whole-house primary MOV device on the main load center, and distributed
/archives//html/Towertalk/2009-09/msg00272.html (9,286 bytes)

68. Re: [TowerTalk] Open wire (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 29 Sep 2009 09:02:14 -0400
Open wire transmission line can be the "near miracle" form of line if several electrical parameters are known. All too often, open or ladder line is deployed without regard to line length from ineff
/archives//html/Towertalk/2009-09/msg00514.html (11,266 bytes)

69. Re: [TowerTalk] Ham Radio family electrocuted (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 13 Oct 2009 14:44:51 -0400
U/G high-voltage utilities have their own latent dangers. In this case, it's clearly an issue of safety, training, awareness, having a trained 3rd-party bystander available for emergency dispatch, CP
/archives//html/Towertalk/2009-10/msg00160.html (9,734 bytes)

70. Re: [TowerTalk] Not QUITE a tower (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 13 Oct 2009 19:05:56 -0400
It's an interesting subject. See "Lesson #7" in the first link below for some guidance. http://pages.prodigy.net/k2kw/learning.html http://www.k2kw.com/verticals/tests.html The other question I have
/archives//html/Towertalk/2009-10/msg00185.html (9,564 bytes)

71. Re: [TowerTalk] Rohn SSV Towers (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 30 Oct 2009 10:02:08 -0400
That depends on which SSV sections you're using. The SSV was designed so that one could choose between wide and narrow sections where many different possibilities are possible to make a 100-foot tow
/archives//html/Towertalk/2009-10/msg00465.html (8,300 bytes)

72. [TowerTalk] Dipole Z Calculator (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 5 Nov 2009 10:56:20 -0500
I am looking for any type of computational tool that will allow me to quickly look at the terminal Z of a dipole in free space where I can change its wavelength from 0.25 to say...approximately 7 wav
/archives//html/Towertalk/2009-11/msg00120.html (6,598 bytes)

73. Re: [TowerTalk] Vertical dipoles (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 18 Nov 2009 07:16:53 -0500
John, Why are you now feeding your vertical dipole asymmetrically? I see a center-fed element in one diagram, but it changes to a bottom feed at the end of your web page. Tnx! Paul, W9AC ___________
/archives//html/Towertalk/2009-11/msg00315.html (9,014 bytes)

74. Re: [TowerTalk] Open wire lines (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 30 Nov 2009 10:16:59 -0500
I've found that the best information on open wire line theory, construction, and coupling techniques comes from pre-1960 ARRL Antenna Book's, Terman's Radio Engineering Handbook, and the material fr
/archives//html/Towertalk/2009-11/msg00517.html (8,334 bytes)

75. Re: [TowerTalk] Open wire lines (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 30 Nov 2009 11:24:01 -0500
It's out there -- you just have to go back in time to find it. High power and high SWR can co-exist nicely when the transmission line concepts are understood. All too often, an op chooses some rando
/archives//html/Towertalk/2009-11/msg00519.html (8,380 bytes)

76. [TowerTalk] Open wire lines (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 30 Nov 2009 13:50:19 -0500
significant unbalanced (common mode) currents if what is connected on either end is unbalanced." One method to help with a portion of the unbalance is to remote-feed the open wire line with a remote
/archives//html/Towertalk/2009-11/msg00522.html (9,007 bytes)

77. Re: [TowerTalk] Open wire lines (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 30 Nov 2009 15:47:44 -0500
Not at all if you're happy with the results. On the other hand, you may not know how much of your line is radiating due to coupling of other objects, nor the efficiency of the system unless you know
/archives//html/Towertalk/2009-11/msg00526.html (11,029 bytes)

78. Re: [TowerTalk] Open wire lines (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 30 Nov 2009 15:51:45 -0500
I guess the Towertalk reflector cannot pass extended ASCII characters. The Z02 is actually Zo squared and not Zo * 2. I tried to send a raised "2" but no go. Paul, W9AC _____________________________
/archives//html/Towertalk/2009-11/msg00527.html (7,768 bytes)

79. Re: [TowerTalk] Open wire lines (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 30 Nov 2009 19:05:13 -0500
That worked Karl. Tnx! Paul, W9AC You can also try holding down the "Alt" key while typing "253" or "0178" on the numeric pad. I'll try it here and see if it survives the reflector: ZoČ I'm seeing a
/archives//html/Towertalk/2009-11/msg00536.html (10,781 bytes)

80. Re: [TowerTalk] Open wire lines (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 30 Nov 2009 19:07:50 -0500
Sorry, meant Rick, N6RK. Paul, W9AC That worked Karl. Tnx! Paul, W9AC You can also try holding down the "Alt" key while typing "253" or "0178" on the numeric pad. I'll try it here and see if it survi
/archives//html/Towertalk/2009-11/msg00537.html (11,252 bytes)

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