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References: [ +from:k9ay@k9ay.com: 184 ]

Total 184 documents matching your query.

61. Re: Topband: K9AY and 756Pro - Summary (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Tue, 28 Dec 2004 12:54:45 -0600
for very limited space, with the following provisos: .... --> -- I have recently confirmed that the use of a Vactrol is highly overrated. An examination of Vactrol data shows poor temperature stabil
/archives//html/Topband/2004-12/msg00336.html (8,874 bytes)

62. Re: Topband: elevated k9ay loop (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Fri, 18 Feb 2005 20:12:45 -0600
Rudy, A few K9AY Loop users have successfully installed them above ground (2 or 3 meters). If you have a ground wire that is nearly straight down, the loop should work just fine. But if you put it on
/archives//html/Topband/2005-02/msg00193.html (6,994 bytes)

63. Re: Topband: Elevated vs Buried Radials (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Fri, 4 Mar 2005 22:25:07 -0600
...etc. de W4ZV ____________ The K3LC article has valuable comparison data, but we need to consider a significant variable in his modeling process. I have found Al's work very interesting and useful
/archives//html/Topband/2005-03/msg00046.html (8,792 bytes)

64. Re: Topband: High and low angles (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Sat, 5 Mar 2005 09:33:00 -0600
-- A vertical may still be a good choice for yuor situation. 1/4-wave verticals have a radiation maximum at a takeoff angle of 18 to 30 degrees, for very good to poor ground respectively. An asymmet
/archives//html/Topband/2005-03/msg00053.html (8,106 bytes)

65. Topband: Small loop info (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Wed, 27 Jul 2005 17:01:23 -0500
Topbanders, In the recent "ARRL Contest Rate Sheet," N0AX mentions a paper on small loops that appeared in a recent issue of IEEE Antennas & Propagation Magazine. I also read this paper with interest
/archives//html/Topband/2005-07/msg00023.html (8,799 bytes)

66. Re: Topband: EWE/Flag/K9AY modeling (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Thu, 28 Jul 2005 14:29:20 -0500
___________ Terry and all, 1. While I agree that modeling the K9AY Loop is not simple, the antenna is definitely not "jiggery-pokery." The model came first, including discussions with my good friend
/archives//html/Topband/2005-07/msg00026.html (9,039 bytes)

67. Re: Topband: Pennants/Flag report and K9AY xfmr question (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Wed, 7 Sep 2005 10:23:10 -0500
Luis, My comments are included below with snips of your questions. 73, Gary K9AY _____________________ Good choice! It is my experience that common-mode problems are rare with buried feedlines, since
/archives//html/Topband/2005-09/msg00003.html (9,818 bytes)

68. Re: Topband: Amidon Beads (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Wed, 14 Sep 2005 12:25:29 -0500
This is the right part no. -- I use a drop of super glue to make a 'binocular' core using two of them. No typo, Tom -- 77 material makes excellent 160M transformers (as does 73). It was recommended
/archives//html/Topband/2005-09/msg00031.html (8,484 bytes)

69. Re: Topband: Tuning elevated radials (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Fri, 16 Sep 2005 09:07:08 -0500
.... ___________________ Ford, You hit one of my "hot buttons" -- I have not seen any convincing evidence that equalizing currents in elevated radials is a valid exercise. Even if it is, the "soluti
/archives//html/Topband/2005-09/msg00037.html (8,924 bytes)

70. Re: Topband: K9AY loop (AYL-4) (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Tue, 18 Oct 2005 16:39:26 -0500
-- The preamp in the AYL-4 is basically a one watt power amplifier (a 2N3866 -- like a 2N5109 but higher voltage rating). It's more rugged than most RX front ends, and with 17-18 dB gain it can deli
/archives//html/Topband/2005-10/msg00137.html (8,324 bytes)

71. Re: Topband: Engineering ?? @ relays (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Wed, 19 Oct 2005 13:15:29 -0500
As others have pointed out, RX switching relays can be more troublesome than TX switching due to contact oxidation. I used sealed relays in my K9AY loops, preamps and RAS-8x2 RX antenna switch that
/archives//html/Topband/2005-10/msg00152.html (8,184 bytes)

72. Re: Topband: K9AY loop question (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Mon, 14 Nov 2005 22:18:56 -0600
-- Paul, First, the physics of the antenna limit the F/B to one null and establish the efficiency (signal level). Radials are usually considered in unusual installations or when the ground conductiv
/archives//html/Topband/2005-11/msg00166.html (8,198 bytes)

73. Re: Topband: Beverages (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Fri, 18 Nov 2005 12:51:19 -0600
(de W8JI) -- _______ Bad components are quite common, based on my personal experience helping a number of hams get their Beverages working. Here are the ones I've seen: * Using wirewound resistors, o
/archives//html/Topband/2005-11/msg00225.html (8,473 bytes)

74. Re: Topband: Antenna Impedance vs efficiency (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Wed, 23 Nov 2005 09:56:22 -0600
________________ First, it's not measured. The impedance of free space (377 ohms) is a mathematical construct, obtained by solving Maxwell's equations for an ideal isotropic radiator (point source),
/archives//html/Topband/2005-11/msg00285.html (8,584 bytes)

75. Re: Topband: Trap for 160m/80m inverted L (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Fri, 9 Dec 2005 13:32:16 -0600
Jerry, If you have a little more room, a dual inverted-L may be feasible -- which needs no traps. When you need to share a single radial system and a single high support on both bands, it is possibl
/archives//html/Topband/2005-12/msg00111.html (8,494 bytes)

76. Topband: Contests (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Sun, 11 Dec 2005 18:05:27 -0600
______________ "You gotta fix it" complaints have shown up after every contest since I can remember. While there are times when contests may benefit from some tweaking of the rules, each one has its
/archives//html/Topband/2005-12/msg00161.html (7,615 bytes)

77. Re: Topband: Shunt Fed Tower (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Tue, 20 Dec 2005 10:26:38 -0600
____ At 60 feet, a shunt wire should go all the way to the top. Two wires spaced the width of the tower face will improve the bandwidth, especially if they are installed more than a foot away from t
/archives//html/Topband/2005-12/msg00259.html (8,759 bytes)

78. Topband: K9AY Loops (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Thu, 22 Dec 2005 16:20:14 -0600
Topbanders, Rumors have circulated that I am no longer manufacturing the K9AY Loop (AYL-4 electronics and AYL-M mast/wire kit). The rumor is NOT true -- but it's understandable that it got started. L
/archives//html/Topband/2005-12/msg00286.html (7,705 bytes)

79. Re: Topband: Adjusting termination resistance (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Wed, 28 Dec 2005 17:14:48 -0600
-- John and all, With a K9AY loop, as with a Beverage, minimum VSWR is not a measure of antenna performance, although it may happen by coincidence. In an installation using an accurate 9:1 transform
/archives//html/Topband/2005-12/msg00368.html (7,375 bytes)

80. Re: Topband: K9AYLoop Grounding (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Mon, 2 Jan 2006 09:02:40 -0600
Paul, The commercial units we make do not have an isolated ground. In theory, an isolated ground would minimize the potential of common-mode problems, but in my experience, that potential is very sm
/archives//html/Topband/2006-01/msg00008.html (7,843 bytes)

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