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21. Topband: modeling BOGs (or whatever we call them) (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Fri, 13 May 2016 16:40:38 -0400; With the recent thread of modeling BOGs, I hope those interested in this endeavor read Rudy N6LF's article in the June 2016 QST. In the article he compared modeling to measurements on three antennas:; /archives//html/Topband/2016-05/msg00030.html (7,314 bytes)
22. Topband: antennas close to ground (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Sat, 14 May 2016 18:37:20 -0400; Mike W0BTU commented: "But I thought that it was a well-established fact that NO antenna modeling software does well with antennas close to the ground". Yes, I believe that's true with the NEC-2 comp; /archives//html/Topband/2016-05/msg00034.html (7,478 bytes)
23. Topband: low band propagation at solar min (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Sun, 5 Jun 2016 19:00:50 -0400; As others have pointed out, we have to remember that articles about another Maunder Minimum are *predictions* based on an *assumed* better understanding of the solar cycle process or *suggestions* on; /archives//html/Topband/2016-06/msg00039.html (7,970 bytes)
24. Topband: 160m arrival angles (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Sun, 17 Jul 2016 15:00:17 -0400; BIll (AA7XT), There's some (but not much) measured data at HF of arriving elevation angles (for example, Wilkins et al, Epstein et al, Utlaut et al, Wilkins again et al, and Hallborg et al). But I've; /archives//html/Topband/2016-07/msg00032.html (7,661 bytes)
25. Topband: midnight peaks (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Mon, 19 Sep 2016 13:04:30 -0400; Over the years I have seen a few comments with respect to signal peaking around local midnight. If you search on "midnight signal peaking" in the topband archives, you should come up with four result; /archives//html/Topband/2016-09/msg00039.html (7,245 bytes)
26. Topband: midnight peaks (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Mon, 19 Sep 2016 18:58:53 -0400; Yes, you have to distinguish between sunrise enhancements and this so-called midnight peak. The 17 November 1996 topband posting that I referenced from DJ8WL told of XZ1N on 1825.5 KHz at 2130 UTC. X; /archives//html/Topband/2016-09/msg00048.html (7,166 bytes)
27. Topband: what's in store for 160m (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Thu, 27 Oct 2016 15:52:53 -0400; About a week ago Wolf DF2PY posted a message here commenting on the recent adverse levels of geomagnetic field activity and how it will now change for the good - giving us good 160m propagation. We'l; /archives//html/Topband/2016-10/msg00157.html (7,666 bytes)
28. Topband: good 160m propagation when the A index is elevated (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Mon, 9 Jan 2017 10:29:12 -0500; hello to everyone, With respect to Wolf DF2PY's comment about very good propagation on polar routes when the A index and the solar wind speed are elevated, our understanding of what makes 160m tick i; /archives//html/Topband/2017-01/msg00016.html (7,658 bytes)
29. Topband: west coast in the mornings (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Sat, 28 Jan 2017 09:56:51 -0500; Hi guys and gals, After walking Snoopy and going out for breakfast this morning, I got back on 160m around 1320z (8:20 AM local here in Ft Wayne - about a half hour past our sunrise). Between 1324z a; /archives//html/Topband/2017-01/msg00090.html (7,222 bytes)
30. Topband: Echo on 160m (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Mon, 6 Feb 2017 10:25:48 -0500; Bruce K1FZ said: "I have noticed that there appears to be a link between the start of an aurora and long path 160 meter openings." Others have noted this interesting effect. The only physical tie bet; /archives//html/Topband/2017-02/msg00031.html (7,946 bytes)
31. Topband: greyline prop forecast (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Thu, 16 Feb 2017 11:15:12 -0500; Kris N5KM asked about greyline propagation predictions. Since his question was posted to the topband reflector, I assume he's only asking in relation to 160-Meters. We do not have any reliable propag; /archives//html/Topband/2017-02/msg00046.html (7,971 bytes)
32. Topband: greyline forecast for 80m (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Fri, 17 Feb 2017 09:47:55 -0500; Hello Kris N5KM, Thanks for the clarification. 80m is a different story. Yes, we can predict greyline propagation on 80m (I assume when you say greyline propagation, you mean propagation along the te; /archives//html/Topband/2017-02/msg00049.html (8,336 bytes)
33. Topband: duo-band 80/160 inverted-L (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Wed, 22 Mar 2017 14:02:11 -0400; Thanks to a big oak tree, I have used a homebrew 80m trap (large diameter B&W Miniductor and high voltage doorknob caps) at the top of my 80m quarterwave wire vertical, and a wire at the top of the t; /archives//html/Topband/2017-03/msg00084.html (6,828 bytes)
34. Topband: low inv-vee (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Tue, 27 Mar 2018 14:49:33 -0400; Pete N4ZR said one option was to "Suspend inverted vees for 80 and 40 from the top of the rocket launcher (right under the tribander)." Gene AD3F commented on low inv-vees: "From what I've read on To; /archives//html/Topband/2018-03/msg00102.html (7,703 bytes)
35. Topband: 160m polarization and elevation angles (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Thu, 29 Mar 2018 13:30:49 -0400; Polarization - As Jerry K4SAV stated, the electron gyro-frequency plays an important role on 160m since our ionosphere is immersed in a magnetic field - it also affects ionospheric absorption and ref; /archives//html/Topband/2018-03/msg00139.html (7,713 bytes)
36. Re: Topband: 160m polarization and elevation angles (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Thu, 29 Mar 2018 19:19:08 -0400; Mark, ionospheric bounce. Theoretically, polarization is well-defined as an electromagnetic wave progresses thru the ionosphere. What's important is the "limiting" polarization at the entry and exit; /archives//html/Topband/2018-03/msg00145.html (9,052 bytes)
37. Re: Topband: WB6RSE Flag type loop question (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Wed, 1 Aug 2018 17:13:03 -0400; Note that the KK5JY antenna is a single loop, not a double loop as G3UNA referenced. That gain value is in the neighborhood of what a Waller Flag does. Carl K9LA _________________ Topband Reflector A; /archives//html/Topband/2018-08/msg00009.html (8,912 bytes)
38. Re: Topband: WB6RSE Flag type loop question (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Wed, 1 Aug 2018 18:01:50 -0400; Joe, I agree. But I believe it's gain is very low mostly because it's made up of electrically very small loops. A very small loop has its main lobes in the plane of the loop - not perpendicular to th; /archives//html/Topband/2018-08/msg00012.html (10,155 bytes)
39. Re: Topband: WB6RSE Flag type loop question (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Thu, 2 Aug 2018 07:28:38 -0400; David, The NEC-4.2 engine appears to give very good results with buried and close-to-ground wires (the NEC-4.1 engine compares favorably, too). It is instructive to read N6LF's July/August 2016 QEX a; /archives//html/Topband/2018-08/msg00016.html (9,364 bytes)
40. Re: Topband: Vertical antennas aren't always best for DX everywhere - the facts (score: 1): Author: Carl Luetzelschwab <carlluetzelschwab@gmail.com>; Date: Thu, 22 Nov 2018 12:03:30 -0500; What Steve and Nick VE7DXR were referring to is the geomagnetic latitude in relation to polarization - not ground conductivity. This involves the ordinary and extraordinary waves that propagate throu; /archives//html/Topband/2018-11/msg00226.html (8,027 bytes)

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