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Total 26 documents matching your query.

1. Topband: One Way Propagation (score: 1): Author: nhp@ieee.org (Nick Hall-Patch); Date: Thu, 14 Feb 2002 20:26:06 -0800; I was waiting for other replies about this, but have seen none, so here is the 2 cents worth: the horizon radar sees a strong reflection from seas with the same wavelength as the transmitted signal,; /archives//html/Topband/2002-02/msg00089.html (7,359 bytes)
2. Topband: One Way Propagation (score: 1): Author: w7dd@msn.com (D. Andersen); Date: Tue, 29 Jan 2002 11:44:36 -0700; I have heard that "One Way Propagation" has been found to be caused by heavy seas. The shape of the waves formed by high wind causes the phenomena. The old "over the horizon" radar is where this was; /archives//html/Topband/2002-01/msg00247.html (6,444 bytes)
3. TopBand: One Way Propagation (score: 1): Author: sears@rell.com (sears@rell.com); Date: Tue, 2 Dec 1997 07:47:59 -0600; Well last night was a waste. I listened from 0300 till 0600Z for 5A2A on 1.829 + 29.5 but nothing. I did hear and work him on 80 meters at 0542Z but couldn't figure out why he wasn't trying 160m. I g; /archives//html/Topband/1997-12/msg00036.html (7,835 bytes)
4. Topband: One way propagation (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sun, 11 Nov 2007 00:17:08 -0500; I'd like to do an experiment. I have a few mirrors or refractive pieces of irregular shaped metal to make a multiple hop path between two points. I have a LASAR to simulate the ray. Can someone tell; /archives//html/Topband/2007-11/msg00055.html (6,610 bytes)
5. Re: Topband: One way propagation (score: 1): Author: "EP Swynar" <gswynar@durham.net>; Date: Sun, 11 Nov 2007 08:16:39 -0500; On 11th November, Tom wrote... "...I have a few mirrors or refractive pieces of irregular shaped metal to make a multiple hop path between two points. I have a LASAR to simulate the ray. Can someone; /archives//html/Topband/2007-11/msg00058.html (9,750 bytes)
6. 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)
7. Topband: One way propagation (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Sun, 11 Nov 2007 07:50:38 -0800; Highly recommended experiment to try Tom. Playing with lasers at UCLRL Livermore circa 1965 when the light bulb went on in my head that said "oh, that's how antennas work" . Having set behind some pr; /archives//html/Topband/2007-11/msg00061.html (7,586 bytes)
8. Re: Topband: One way propagation (score: 1): Author: k3bu@optonline.net; Date: Sun, 11 Nov 2007 16:22:06 +0000 (GMT); "Small" problem, the atmosphere/ionosphere is not "your" mirrors. Making analogy or connection between them is silly, trivilializing and irresponsible. There is refraction, varying angles, "fuzzy mi; /archives//html/Topband/2007-11/msg00062.html (8,233 bytes)
9. Re: Topband: One way propagation (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sun, 11 Nov 2007 11:46:17 -0500; There are things in the electronics world that are not perfectly bilateral. For example a lossy impedance matching network isn't precisely bilaterial. I've been considering the chance the ionosphere; /archives//html/Topband/2007-11/msg00063.html (12,119 bytes)
10. Re: Topband: One way propagation (score: 1): Author: Greg - ZL3IX <zl3ix@inet.net.nz>; Date: Mon, 12 Nov 2007 06:14:44 +1300; Have you ever thrown a coin into the bottom of a shallow pool, Tom? Move away from the vertical far enough and you no longer see it, as total internal reflection takes place. Get someone to stand whe; /archives//html/Topband/2007-11/msg00065.html (8,068 bytes)
11. 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)
12. Topband: One Way Propagation (score: 1): Author: GEORGE WALLNER <gwallner@the-beach.net>; Date: Sun, 11 Nov 2007 20:08:43 -0500; I have a vertical over salt water and a 1500W PA. Nearby is Miami Beach, and I only have a low dipole for receiving. EWE-s, K9Ay-s, and other vertically polarized loops don't work here and there is n; /archives//html/Topband/2007-11/msg00070.html (8,237 bytes)
13. Re: Topband: One way propagation (score: 1): Author: "Milt, N5IA" <n5ia@zia-connection.com>; Date: Sun, 11 Nov 2007 18:19:26 -0700; Mis dos centavos.............. The sets of mirrors are not the same ones in the two directions. The difference in the arrival angles at the two terminals are different and vary from minute to minute.; /archives//html/Topband/2007-11/msg00071.html (8,481 bytes)
14. Re: Topband: One way propagation (score: 1): Author: "EP Swynar" <gswynar@durham.net>; Date: Sun, 11 Nov 2007 21:23:45 -0500; On 11th November, Milt wrote... "...The sets of mirrors are not the same ones in the two directions. The difference in the arrival angles at the two terminals are different and vary from minute to mi; /archives//html/Topband/2007-11/msg00072.html (10,504 bytes)
15. Re: Topband: One way propagation (score: 1): Author: k3bu@optonline.net; Date: Mon, 12 Nov 2007 03:06:02 +0000 (GMT); Don't get too hanged up on mirrors. There is also quite a bit of refraction - ducting going on especially on lower frequencies. See my article at http://www.k3bu.us/propagation.htm one time was poo-; /archives//html/Topband/2007-11/msg00073.html (10,655 bytes)
16. Re: Topband: One way propagation (score: 1): Author: <shristov@ptt.yu>; Date: Mon, 12 Nov 2007 12:13:31 CET; One way propagation is impossible in a linear and isotropic medium. But the medium where HF waves propagate is neither linear nor isotropic. Therefore, one way HF propagation IS possible, although pr; /archives//html/Topband/2007-11/msg00075.html (6,949 bytes)
17. Re: Topband: One way propagation (score: 1): Author: Greg Chartrand <w7my@yahoo.com>; Date: Mon, 12 Nov 2007 03:57:56 -0800 (PST); OK, if I accept there are two different mirrors taking two different paths thus have a overall different path characteristics to work with, why then does the far end hear me better when I hear him be; /archives//html/Topband/2007-11/msg00076.html (8,439 bytes)
18. Re: Topband: One way propagation (score: 1): Author: "EP Swynar" <gswynar@durham.net>; Date: Mon, 12 Nov 2007 07:19:09 -0500; On 11th November, Yuri wrote... "... How do you model atmo/ionosphere between here and Eu? Car (or animal ** Hi Yuri, The fact that propagation on the band is probably not yet a predictable "...exact; /archives//html/Topband/2007-11/msg00077.html (9,363 bytes)
19. Re: Topband: One way propagation (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 12 Nov 2007 09:47:12 -0500; It's a shame with all the common claims of one way prop there is only one set of hard data. I hope my reply will make people realize there are several very common things that can make us think there; /archives//html/Topband/2007-11/msg00079.html (11,037 bytes)
20. Re: Topband: One way propagation (score: 1): Author: "n4is" <n4is@bellsouth.net>; Date: Mon, 12 Nov 2007 12:25:33 -0500; <<One way propagation is impossible in a linear and isotropic medium. Besides all possibilities I would like to mention my own experience. Living in a suburban area I measure my local noise periodica; /archives//html/Topband/2007-11/msg00080.html (8,146 bytes)

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