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41. Topband: Noon time condx (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Tue, 31 Jan 2006 20:40:38 -0500; . . . snip . . . I grew up in Hammond (northwest Indiana) and the 160m mobile operations that Ford referred to had a lot to do with the daily Calumet Area Emergency Net on 1805KHz (if I remember corr; /archives//html/Topband/2006-01/msg00444.html (7,932 bytes)
42. Topband: IS0 QSL (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Sat, 08 Jul 2006 09:15:41 -0400; Same thing for me. Thank you, Mauro. Carl K9LA _______________________________________________ Topband mailing list Topband@contesting.com http://lists.contesting.com/mailman/listinfo/topband; /archives//html/Topband/2006-07/msg00007.html (6,039 bytes)
43. Topband: another Cycle 24 prediction (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Sun, 01 Oct 2006 12:39:32 -0400; Another prediction for Cycle 24 just showed up in the journal 'Spaceweather' published by the American Geophysical Union (AGU). If this one turns out to be the most accurate one, it will be good news; /archives//html/Topband/2006-10/msg00007.html (6,994 bytes)
44. Topband: 160m experiment (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Sat, 07 Oct 2006 08:26:28 -0400; Marconi reported reception at 12:30, 1:10, and 2:20 local time. Adding 3 and 1/2 hours gives 1600 UTC, 1640 UTC, and 1750 UTC. I would kind of be surprised if the beacon receiver guy DOESN'T hear the; /archives//html/Topband/2006-10/msg00057.html (7,969 bytes)
45. Re: Topband: Moon and the Ionosphere : YO3FFF (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Wed, 14 Mar 2007 18:56:29 -0400; I don't think I can add any more than what's already been posted previously on the topband reflector. Go to the topband searchable archives and do a search on "moon". Of the many postings, two intere; /archives//html/Topband/2007-03/msg00047.html (6,945 bytes)
46. Re: Topband: Moon and the Ionosphere : YO3FFF (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Thu, 15 Mar 2007 20:55:56 -0400; Cris, I agree - trying to separate out any effect of the moon from other variables will likely prove to be very difficult. This could also be done with exisiting low frequency BC beacons that are the; /archives//html/Topband/2007-03/msg00054.html (8,556 bytes)
47. Re: Topband: sunrise (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Sat, 21 Apr 2007 19:07:59 -0400; Bob, The official definition of sunrise is when the center of the sun is 0.8333 degrees below the horizon. Due to refraction in the atmosphere and the size of the sun, this puts the upper limb of the; /archives//html/Topband/2007-04/msg00095.html (7,299 bytes)
48. Re: Topband: sunrise (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Sun, 22 Apr 2007 09:52:03 -0400; There appears to be two issues with sunrise and propagation on the low bands. First, the signal enhancement around sunrise that W7LR mentioned is believed to be due to tilts in the E and F regions at; /archives//html/Topband/2007-04/msg00098.html (7,575 bytes)
49. Re: Topband: sunset enhancements (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Sun, 22 Apr 2007 20:17:59 -0400; If the theory is correct that sunrise enhancements are tied to the tilt in the ionosphere at sunrise, then one would expect sunset enhancements to be just as prevalent since there's a tilt then, too; /archives//html/Topband/2007-04/msg00102.html (6,827 bytes)
50. Topband: EA to VE3 on 40m (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Sun, 30 Sep 2007 20:22:17 -0400; Eddy VE3CUI commented: Although 1100 UTC is around noon in Spain, the overhead Sun at the end of Septembder is just south of the equator - so the solar zenith angle on the EA-to-VE3 path never gets b; /archives//html/Topband/2007-09/msg00172.html (7,720 bytes)
51. Re: Topband: One way propagation (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Sun, 11 Nov 2007 08:30:03 -0500; Tom, In order to make the experiment more realistic, you would have to make sure that your refractive pieces of irregular shaped metal have varying indices of refraction versus height all along the p; /archives//html/Topband/2007-11/msg00059.html (8,165 bytes)
52. Re: Topband: One way propagation (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Sun, 11 Nov 2007 19:38:45 -0500; The only hard data I've ever seen that suggests the ionosphere itself may contribute to "one-way propagation" is the extensive work of John Wang at the FCC in the 1970s in validating North American s; /archives//html/Topband/2007-11/msg00068.html (8,656 bytes)
53. Topband: N1BUG's recent observations (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Sat, 15 Dec 2007 18:16:44 -0500; 160m enthusiasts, For newcomers to 160m, Paul N1BUG's 11Dec e-mail highlighted one of the interesting phenomenon related to propagation on 160m. Paul noted that on December10 "between approximately 2; /archives//html/Topband/2007-12/msg00127.html (7,523 bytes)
54. Topband: predicting 160m propagation (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Thu, 20 Dec 2007 17:38:41 -0500; There have been several attempts over the years to identify trends in solar and geomagnetic indices that predict propagation on 160m. I don't beleive any of them met with much success (as you also co; /archives//html/Topband/2007-12/msg00153.html (6,850 bytes)
55. Topband: daylight QSOs during the SP (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Mon, 31 Dec 2007 09:45:10 -0500; Bud W2RU summed it up nicely with respect to VE3MGY's query about propagtion on 160m in daylight. A station running 1000W to a vertical and having a quiet noise environment should be able to work oth; /archives//html/Topband/2007-12/msg00245.html (6,733 bytes)
56. Re: Topband: Daylight QSO's during the SP (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Mon, 31 Dec 2007 15:47:07 -0500; I believe many will agree that this is not an uncommon scenario - especially in the winter months with high solar zenith angles (the Sun is low on the horizon). What's important is where the electrom; /archives//html/Topband/2007-12/msg00254.html (8,789 bytes)
57. Topband: estimating daytime distances (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Sat, 05 Jan 2008 10:45:16 -0500; We can estimate the distance for daytime propagation on 160m with some rough calculations. The followoing table gives ionospheric absorption (from Proplab Pro) on 160m at noon in winter at solar mini; /archives//html/Topband/2008-01/msg00049.html (8,006 bytes)
58. Re: Topband: Partial Radial System (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Sun, 13 Jan 2008 20:56:36 -0500; NCJ ran a feature by Al K3LC in the Sep/Oct 2006 issue showing how the gain of a vertical antenna at various elevation angles depends on ground away from the antenna. The results showed that ground a; /archives//html/Topband/2008-01/msg00101.html (7,889 bytes)
59. Re: Topband: Propagation on November 1 (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Thu, 06 Nov 2008 20:33:27 -0500; The reports of unusual propagation on November 1 are certainly interesting. As for an explanation, we have to remember that we can hardly predict what makes a good night and what makes a bad night on; /archives//html/Topband/2008-11/msg00055.html (8,666 bytes)
60. Re: Topband: Polarisation coupling effects at MF?? (score: 1): Author: Carl K9LA <k9la@gte.net>; Date: Sat, 13 Dec 2008 16:12:26 -0500; Arunas, There's nothing mystical about it. It's all in the physics of a plasma (the ionosphere) immersed in a magnetic field. The polarization effect is tied to the electron gyro-frequency (the frequ; /archives//html/Topband/2008-12/msg00156.html (9,643 bytes)

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