Mail Archive Search: <+from:Thomas Giella>

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References: [ +from:Thomas: 325 ] [ Giella: 245 ]

Total 186 documents matching your query.

21. Topband: Propagation Debate (score: 146): Author: kn4lf@hotmail.com (KN4LF, Thomas Giella); Date: Fri, 28 Dec 2001 19:09:11 -0500; If I may, to save bandwidth and time I think I've pretty much covered all the propagation vagaries we see on 160 meters, on my sub website KN4LF Medium Wave Radio Propagation Theory Notes: http://www; /archives//html/Topband/2001-12/msg00157.html (7,118 bytes)
22. Topband: Lightning Protection (score: 146): Author: kn4lf@tampabay.rr.com (KN4LF, Thomas Giella); Date: Mon, 17 Sep 2001 21:21:54 -0400; Tom W8JI Said: The cause of lightning discharge is the large voltage gradient between earth and a cluster of charged moisture in the air. The only way to remove the charge is to have an actual path b; /archives//html/Topband/2001-09/msg00093.html (12,297 bytes)
23. Topband: Trees For Antennas (score: 146): Author: kn4lf@tampabay.rr.com (KN4LF, Thomas Giella); Date: Sun, 12 Aug 2001 12:26:22 -0400; I conducted experiments on 160, 80 and 40 meters with trees as transmitting antennas here in Florida, back in 1989. My interest began tied to being a Meteorologist and my 35 year study of lightning a; /archives//html/Topband/2001-08/msg00046.html (8,620 bytes)
24. Topband: Topband Propagation (score: 146): Author: "Thomas Giella KN4LF" <kn4lf@tampabay.rr.com>; Date: Tue, 14 Oct 2003 11:12:31 -0400; Per W0AH's query: I have the following on my propagation website at http://www.kn4lf.com/kn4lf5.htm . Read #4 and #5. Here are some general guidelines concerning correlation of propagation indices to; /archives//html/Topband/2003-10/msg00080.html (10,330 bytes)
25. Topband: X40+ ? Super Solar Flare (score: 146): Author: "Thomas Giella KN4LF" <kn4lf@tampabay.rr.com>; Date: Tue, 4 Nov 2003 15:52:47 -0500; It appears that the x-ray flux sensors became saturated by this latest super solar flare. Because of the duration saturation of the sensors this super solar flare probably exceeded X30-40 and has pro; /archives//html/Topband/2003-11/msg00019.html (10,821 bytes)
26. Topband: MF Anti-Podal Propagation Enhancement (score: 146): Author: "Thomas Giella KN4LF" <kn4lf@tampabay.rr.com>; Date: Tue, 30 Mar 2004 00:06:06 -0000; Most of the propagation enhancement that we may mistake for antipodal focusing is actually via the E Valley/F Layer ducting mechanism. 73 & GUD DX, Thomas F. Giella, KN4LF Retired Space & Atmospheric; /archives//html/Topband/2004-03/msg00325.html (8,580 bytes)
27. Topband: CQ 160 Meter SSB Contest Radiowave Propagation Forecast (score: 146): Author: "Thomas F. Giella NZ4O" <solarcycle24@tampabay.rr.com>; Date: Fri, 25 Feb 2011 06:17:16 -0500; Below is my 160 meter radiowave propagation forecast for the CQ 160 Meter SSB Contest. I would appreciate some feedback on the usefulness of the forecast for DXing and contesting. A simple yes or no; /archives//html/Topband/2011-02/msg00177.html (11,585 bytes)
28. Topband: For Sale KD9SV 160 M Receiver Antenna Preamp (score: 146): Author: "Thomas F. Giella" <thomasfgiella@tampabay.rr.com>; Date: Fri, 9 Sep 2011 16:09:37 -0400; I have for sale KD9SV 160 Meter Receive Antenna Preamplifier. It was used on my outdoor rotatable coaxial receive loop and is now excess to my needs. In like new condition. Gain is adjustable from 0-; /archives//html/Topband/2011-09/msg00063.html (7,671 bytes)
29. Topband: F.S. KD9SV Transceiver Front End Protector With Rig To Amp Interface Buffer (score: 146): Author: "Thomas F. Giella" <thomasfgiella@tampabay.rr.com>; Date: Sat, 17 Sep 2011 11:46:34 -0400; I have for sale a KD9SV Transceiver Front End Protector With Rig To Amp Interface Buffer. It was used between my Icom 756 Pro III and 160 meter outdoor rotatable coaxial receive loop, also between my; /archives//html/Topband/2011-09/msg00088.html (8,493 bytes)
30. Re: Topband: greyline prop forecast (score: 146): Author: "Thomas F. Giella W4HM" <thomasfgiella@gmail.com>; Date: Fri, 17 Feb 2017 14:21:44 -0500; True grey line radio wave propagation rarely occurs on 160 meters and true long path propagation even less. When it does the opening is usually only a few minutes long. Instead it's usually a skewed; /archives//html/Topband/2017-02/msg00054.html (14,925 bytes)
31. Topband: Trees as Antennas (score: 138): Author: kn4lf at tampabay.rr.com (Thomas Giella KN4LF); Date: Tue Aug 12 11:20:43 2003; We talk about and experiment with antennas all the time as 160 dxers and contesters. I am in the process of adding new antenna links to my website "KN4LF 160 Meter Amateur Radio Resources & More" at; /archives//html/Topband/2003-08/msg00059.html (7,614 bytes)
32. Topband: Feeding 1/2 Wave Verticals (score: 138): Author: kn4lf at tampabay.rr.com (Thomas Giella KN4LF); Date: Wed Aug 20 16:10:53 2003; In the past I have successfully loaded up an electrical 1/2 wave vertical tee with a parallel network. I used 800 watts and never had high voltage flashover problems but I did use very large componen; /archives//html/Topband/2003-08/msg00103.html (7,279 bytes)
33. Topband: RE: IMD On FT-757 & FT-747GX VS FT-840 Etc (score: 138): Author: kn4lf at tampabay.rr.com (Thomas Giella); Date: Tue Jun 24 15:11:51 2003; My QTH is in a suburban high signal environment with powerful broadcast band stations nearby. I have a 50 KW station on 1010 kc approximately 4 miles to my WNW, a 10 kw station on 760 kc approximatel; /archives//html/Topband/2003-06/msg00054.html (8,056 bytes)
34. Topband: Lightning Protection E-List (score: 138): Author: kn4lf at tampabay.rr.com (Thomas Giella); Date: Sat Apr 19 11:51:03 2003; I'm a member of a moderated Yahoo Groups E-list called Lightning ProtectionLightning & Power Quality Issues at: http://groups.yahoo.com/group/LightningProtection/?yguid=135876578 . It has 761 profess; /archives//html/Topband/2003-04/msg00038.html (7,217 bytes)
35. Topband: Stew Perry Propagation Condx (score: 138): Author: kn4lf@gbronline.com (Thomas Giella KN4LF); Date: Sat, 4 Jan 2003 17:04:57 -0500; Allot of the variability of or perception of variability of propagation conditions during the S.P. CW contest can probably be explained as variations in local QRN levels and unexpected nulls in certa; /archives//html/Topband/2003-01/msg00030.html (7,933 bytes)
36. Topband: Skewed Propagation Paths (score: 138): Author: kn4lf@tampabay.rr.com (Thomas Giella KN4LF); Date: Thu, 16 Jan 2003 08:16:28 -0500; Basically the simplest way to look at medium frequency signal propagation path skewing is that the transmitted RF signal will "always" seek to propagate along the path with least absorption, which al; /archives//html/Topband/2003-01/msg00089.html (7,799 bytes)
37. Topband: Topband Skewed Propagation (score: 138): Author: kn4lf@tampabay.rr.com (Thomas Giella KN4LF); Date: Thu, 16 Jan 2003 21:56:10 -0500; .....Basically the simplest way to look at medium frequency signal propagation path skewing is that the transmitted RF signal will "always" seek to propagate along the path with least absorption.....; /archives//html/Topband/2003-01/msg00101.html (8,013 bytes)
38. Topband: Topband Skewed Propagation (score: 138): Author: kn4lf@tampabay.rr.com (Thomas Giella KN4LF); Date: Fri, 17 Jan 2003 10:31:42 -0500; The whole concept of skewed propagation via this current thread that we are discussing is just a matter of semantics. Also I appreciate Bill W4ZV allowing me the time to explain the theory on this re; /archives//html/Topband/2003-01/msg00109.html (10,439 bytes)
39. Topband: SR/SS Greyline Research (score: 138): Author: kn4lf@tampabay.rr.com (Thomas Giella KN4LF); Date: Fri, 17 Jan 2003 11:36:14 -0500; I am a member of the Propagation Studies Committee of the RSGB. Within the organization their is very useful research currently being conducted on sunnrise/sunset greyline propagation enhancement. Th; /archives//html/Topband/2003-01/msg00113.html (7,206 bytes)
40. Topband: 160 Meter Propagation (score: 138): Author: kn4lf@gbronline.com (Thomas Giella, KN4LF); Date: Wed, 18 Dec 2002 23:05:33 -0500; Here are some general guidelines concerning correlation of propagation indices to actual expected 160 meter propagation conditions. 1.) Dropping indices numbers are better. 2.) For medium frequencies; /archives//html/Topband/2002-12/msg00235.html (8,387 bytes)

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