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21. Topband: Beverage's Other Antenna (score: 1): Author: K9AY" <k9ay@k9ay.com (K9AY); Date: Wed, 13 Feb 2002 14:02:47 -0500; -- It's been done, Bill The pennant and flag are vertically-oriented versions of "Beverage's Other Antenna." The K9AY loop and EWE can be considered as equivalent ground-image versions. I have extens; /archives//html/Topband/2002-02/msg00069.html (7,202 bytes)
22. Topband: K9AY Dimensions--help! (score: 1): Author: K9AY" <k9ay@k9ay.com (K9AY); Date: Thu, 3 Jan 2002 16:54:17 -0500; Ed The shape of the loop affects the shape of the pattern. The delta/triangle shape for the K9AY loop was chosen for two reasons: 1) it only needs one support, and 2) it results in a null at about 30; /archives//html/Topband/2002-01/msg00008.html (7,951 bytes)
23. Topband: K9AY Recieve ant (score: 1): Author: K9AY" <k9ay@k9ay.com (K9AY); Date: Fri, 4 Jan 2002 15:39:44 -0500; or -- Paul The original article was in September 1997 QST, with additional notes in the Technical Correspondence column in May 1998. Information is also available at: www.aytechnologies.com 73, Gary; /archives//html/Topband/2002-01/msg00012.html (6,686 bytes)
24. Topband: Transformer Question (score: 1): Author: K9AY" <k9ay@k9ay.com (K9AY); Date: Fri, 4 Jan 2002 22:01:44 -0500; Ford You started out OK... You can cancel the reactance at either side of the transformer. The 260 +j330 will be transformed to about 65 +j82.5, but not exactly, due to stray inductance, and the capa; /archives//html/Topband/2002-01/msg00018.html (8,623 bytes)
25. Topband: Transformer Question (score: 1): Author: k9ay@k9ay.com (K9AY); Date: Sat, 05 Jan 2002 16:55:30 +0000; Ford, Thomas I quickly built and measured the situation you described. The transfomer is conventional (separate primary and secondary windings), but tightly inter-wound for k~1, with the right ferrit; /archives//html/Topband/2002-01/msg00024.html (7,814 bytes)
26. Topband: NAQP (score: 1): Author: K9AY" <k9ay@k9ay.com (K9AY); Date: Tue, 8 Jan 2002 10:34:00 -0500; Bob, Yes, there will be plenty of activity on 160 in the NAQP! Here in the East, we even work Europe if conditions are good. Look for Caribbean and Central American activity, too, since all North Ame; /archives//html/Topband/2002-01/msg00045.html (6,848 bytes)
27. Topband: FM on 2.250? (score: 1): Author: k9ay@k9ay.com (K9AY); Date: Thu, 17 Jan 2002 11:48:51 +0000; Check with your local electric utility -- a carrier-current control and monitoring system is a possibility, especially since it's outside the ham bands (they are supposed to avoid us and other known; /archives//html/Topband/2002-01/msg00117.html (6,720 bytes)
28. Topband: balun (score: 1): Author: K9AY" <k9ay@k9ay.com (K9AY); Date: Sun, 27 Jan 2002 14:42:08 -0500; Walter, For a 16:1 transformer with isolated windings (Model TRX-16), see: http://www.arraysolutions.com/Products/lowbandrcv.htm 73, Gary K9AY; /archives//html/Topband/2002-01/msg00217.html (6,647 bytes)
29. Topband: Shunt feed on a budget (score: 1): Author: K9AY" <k9ay@k9ay.com (K9AY); Date: Sun, 27 Jan 2002 16:03:05 -0500; I have had good luck using several high voltage disc ceramic capacitors in parallel. These are often quite cheap at hamfests and surplus stores. Look for physically large capacitors with heavy wire l; /archives//html/Topband/2002-01/msg00220.html (7,856 bytes)
30. Re: Topband: Preamp shielding (score: 1): Author: "K9AY" <k9ay@k9ay.com>; Date: Mon, 22 Sep 2003 12:10:59 -0500; Thomas, If the coax is buried or lying on the ground, it is probably OK to put the preamp indoors, since the lossy earth will reduce any noise and signal pickup on the coax feedline. But if you suspe; /archives//html/Topband/2003-09/msg00097.html (8,197 bytes)
31. Re: Topband: Open Wire Lines - Fact and Fiction (score: 1): Author: "K9AY" <k9ay@k9ay.com>; Date: Sun, 28 Sep 2003 01:40:10 -0500; This note piqued my interest and I reached the conclusion that the right answer lies closer to W8JI's claims than K8LV's calculations. To wit... K8LV -- Assuming a straightforward construction, my ca; /archives//html/Topband/2003-09/msg00130.html (10,215 bytes)
32. Re: Topband: Open Wire Lines - Fact and Fiction (score: 1): Author: "K9AY" <k9ay@k9ay.com>; Date: Mon, 29 Sep 2003 12:54:17 -0500; My point was simply to show that the magnitude of this loss mechanism is miniscule... This tiny line loss due to radiation still exists if the line is twisted. The twist simply achieves cancellation; /archives//html/Topband/2003-09/msg00138.html (8,163 bytes)
33. Topband: more feedline data (score: 1): Author: "K9AY" <k9ay@k9ay.com>; Date: Tue, 30 Sep 2003 00:09:40 -0500; I discovered an error in my calculations of basic resistive feedline loss, and I am not afraid to admit it! In the process of reviewing various references, I got the units wrong. Some formulas used f; /archives//html/Topband/2003-09/msg00142.html (8,213 bytes)
34. Re: Topband: Phased Pennants: Staggered? (score: 1): Author: "K9AY" <k9ay@k9ay.com>; Date: Mon, 10 Nov 2003 16:00:40 -0600; Let me add another few cents worth... Theoretically, two small loop antennas can have a nicely improved front lobe and, as Tom points, with 180 degree phasing (I prefer about 165 deg.), can add nulls; /archives//html/Topband/2003-11/msg00063.html (9,058 bytes)
35. Re: Topband: Re: core inductance and current (score: 1): Author: "K9AY" <k9ay@k9ay.com>; Date: Wed, 19 Nov 2003 08:42:39 -0600; I use 220 uH RF chokes rated at 0.5 amp DC current, with no problems. They are solenoid-wound, single-layer on a ferrite core. I avoid larger values and higher current ratings -- they usually have tw; /archives//html/Topband/2003-11/msg00141.html (8,210 bytes)
36. Re: Topband: mediocre beverages or K9AY loop? (score: 1): Author: "K9AY" <k9ay@k9ay.com>; Date: Wed, 19 Nov 2003 09:29:37 -0600; Dave, Maybe you should do both Beverages and loops. I am a big fan of Beverages -- and I've had acceptable results with them as short as 350 feet (longer is better, of course). At the previous QTH, I; /archives//html/Topband/2003-11/msg00144.html (8,270 bytes)
37. Re: Topband: BOG... (score: 1): Author: "K9AY" <k9ay@k9ay.com>; Date: Mon, 8 Dec 2003 19:13:50 -0600; I don't feel the slight signal loss hurts me at all. -- -- It's the former, not the latter... Mismatch at the feedpoint will only result in signal loss. Reflections due to mismatch at the feedpoint; /archives//html/Topband/2003-12/msg00069.html (7,434 bytes)
38. Re: Topband: Cone of Silence (score: 1): Author: "K9AY" <k9ay@k9ay.com>; Date: Tue, 9 Dec 2003 16:25:48 -0600; Sloping the ends of a Beverage is one of many antenna ideas that seem plausible, but do not hold up under further analysis. I know Tom W8JI has explained this before, but I'll try again... It doesn't; /archives//html/Topband/2003-12/msg00085.html (8,935 bytes)
39. Re: Topband: Listening (score: 1): Author: "K9AY" <k9ay@k9ay.com>; Date: Tue, 9 Dec 2003 16:46:55 -0600; -- receivers. -- You're both right. John did say a "partial solution" and I'll bet he means that some combinations of paralleled antennas work, and others do not. I've done this myself and found it; /archives//html/Topband/2003-12/msg00086.html (8,918 bytes)
40. Re: Topband: FERRITE BEADS (score: 1): Author: "K9AY" <k9ay@k9ay.com>; Date: Fri, 19 Dec 2003 13:47:44 -0600; I concur that 77 material is a good choice. It is designed for RF applications and has lower loss than 43 or 73 materials, which -- by design -- have higher resistive loss to absorb energy in EMI/RF; /archives//html/Topband/2003-12/msg00157.html (8,328 bytes)

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