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1. Topband: one-way propagation (score: 1): Author: "k9la@frontier.com" <k9la@frontier.com>; Date: Mon, 3 Dec 2012 10:09:45 -0800 (PST); Jim K9YC asked about other possible mechanisms besides atmospheric noise to account for one-way propagation on 160-Meters. For the record, I also believe atmospheric noise (and even man-made noise as; /archives//html/Topband/2012-12/msg00073.html (9,240 bytes)
2. Re: Topband: one-way propagation (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Mon, 03 Dec 2012 11:22:34 -0800; Thanks for the great response, Carl. 73, Jim K9YC _______________________________________________ Topband reflector - topband@contesting.com; /archives//html/Topband/2012-12/msg00075.html (7,438 bytes)
3. Re: Topband: one-way propagation (score: 1): Author: "James Wolf" <jbwolf@comcast.net>; Date: Mon, 3 Dec 2012 18:35:16 -0500; To expand a little on Carl's explanation, the ionosphere is not as isotropy as we commonly imagine - in that it is not a nice smooth balloon shaped surface to bounce a signal off of. Instead, there a; /archives//html/Topband/2012-12/msg00080.html (10,215 bytes)
4. Re: Topband: one-way propagation (score: 1): Author: "ZR" <zr@jeremy.mv.com>; Date: Mon, 3 Dec 2012 14:05:05 -0500; Having operated in Western and Central Europe a few times over the years on 160-40M from average to better stations Ive observed something else. With the typical 5-7 hour time difference the East Coa; /archives//html/Topband/2012-12/msg00102.html (11,627 bytes)
5. Re: Topband: one-way propagation (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Tue, 4 Dec 2012 07:26:18 +0100; I worked about 40 stations during ARRL 160m by S&P. Best signals strength occured between 21:00 and 22:00 UTC both days with VY2ZM peaking S9+20db. That is around your sunset at the east coast. Band; /archives//html/Topband/2012-12/msg00107.html (12,069 bytes)
6. Re: Topband: one-way propagation (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 4 Dec 2012 06:44:51 -0500; To expand a little on Carl's explanation, the ionosphere is not as isotropy as we commonly imagine - in that it is not a nice smooth balloon shaped surface to bounce a signal off of. Instead, there a; /archives//html/Topband/2012-12/msg00113.html (10,241 bytes)
7. Re: Topband: one-way propagation (score: 1): Author: "James Wolf" <jbwolf@comcast.net>; Date: Tue, 4 Dec 2012 15:41:08 -0500; Tom, It is a known that the ionosphere is not a perfect sphere. It is always moving and it is lumpy and tilted. Together these occurrences can cause focusing and defocusing of the wave due to deformi; /archives//html/Topband/2012-12/msg00128.html (10,406 bytes)
8. Re: Topband: one-way propagation (score: 1): Author: Carl Clawson <clawsoncw@gmail.com>; Date: Tue, 4 Dec 2012 13:11:26 -0800; I'm weighing in with Tom here. The reciprocity theorem in electromagnetism is well known, and it shows that no amount of focusing, defocusing, scattering, refraction, or reflection will by themselves; /archives//html/Topband/2012-12/msg00129.html (9,049 bytes)
9. Re: Topband: one-way propagation (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Tue, 4 Dec 2012 16:08:32 -0600; I've often thought that some "one-way propagation" is simply due to the differences in antennas. For example, two stations with the same power, ambient noise level, etc. are receiving on Beverages po; /archives//html/Topband/2012-12/msg00131.html (8,487 bytes)
10. Re: Topband: one-way propagation (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 4 Dec 2012 17:09:06 -0500; It is a known that the ionosphere is not a perfect sphere. It is always moving and it is lumpy and tilted. Together these occurrences can cause focusing and defocusing of the wave due to deformities; /archives//html/Topband/2012-12/msg00132.html (9,585 bytes)
11. Re: Topband: one-way propagation (score: 1): Author: "N4IS" <n4is@comcast.net>; Date: Tue, 4 Dec 2012 18:17:35 -0500; Jim Not always, polarization plays a lot on 160m, in special W-E E-W. Sometimes a signal from Africa dive on the QSB and disappear from the Vertical WF and switching to the horizontal WF the signal i; /archives//html/Topband/2012-12/msg00134.html (11,898 bytes)
12. Re: Topband: one-way propagation (score: 1): Author: Carl Clawson <clawsoncw@gmail.com>; Date: Tue, 4 Dec 2012 15:22:47 -0800; Yes, a good point that I neglected. This entirely circumvents my yammerings about reciprocity. Reciprocity is a characteristic of a single pair of ports in a network. Introducing separate receive ant; /archives//html/Topband/2012-12/msg00135.html (8,958 bytes)
13. Re: Topband: one-way propagation (score: 1): Author: "James Wolf" <jbwolf@comcast.net>; Date: Tue, 4 Dec 2012 19:13:25 -0500; Carlos, That is also true. The incident wave when entering into the ionosphere splits into two elliptically polarized waves, and are likely in opposite polarization from each other as well as having; /archives//html/Topband/2012-12/msg00139.html (13,022 bytes)
14. Re: Topband: one-way propagation (score: 1): Author: "N4IS" <n4is@comcast.net>; Date: Tue, 4 Dec 2012 19:42:10 -0500; Jim Is your WF horizontal antenna much higher than the vertical? < Yes, the HWF boom is at 116ft and the VWF=BWF as I used to call it , the boon is at 50ft Both antennas has RDF of 11.5 db, the HWF h; /archives//html/Topband/2012-12/msg00140.html (12,831 bytes)
15. Re: Topband: one-way propagation (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 04 Dec 2012 17:12:16 -0800; Tom, I don't think anyone takes issue with the concept of propagated noise raising the noise level on one side of the QSO while the other side is still quiet. Anyone who looks for it will see it if t; /archives//html/Topband/2012-12/msg00141.html (11,275 bytes)
16. Re: Topband: one-way propagation (score: 1): Author: "ZR" <zr@jeremy.mv.com>; Date: Tue, 4 Dec 2012 21:51:01 -0500; It just goes to show that what looks good on paper in theory does not mean it HAS to be the same in the real world. There is nothing to prevent 2 signals a continent away and with different antennas; /archives//html/Topband/2012-12/msg00166.html (11,274 bytes)
17. Re: Topband: one-way propagation (score: 1): Author: Peter Sundberg <sm2cew@telia.com>; Date: Wed, 05 Dec 2012 17:52:17 +0000; Last weekend was (finally) a return of over-the-pole conditions in my QTH, similar to what we experienced frequently in 2009 and 2010. I could hear western NA stations ALL day here, some with very go; /archives//html/Topband/2012-12/msg00177.html (11,275 bytes)
18. Re: Topband: one-way propagation (score: 1): Author: Carl Clawson <clawsoncw@gmail.com>; Date: Wed, 5 Dec 2012 10:34:37 -0800; On my 80 meter NTS net last evening (1830 local time) I noticed that the critical frequency had dropped below 3.5 MHz. I could barely hear some stations that were only 40 miles away and my neighbor C; /archives//html/Topband/2012-12/msg00180.html (9,372 bytes)

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