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Total 14 documents matching your query.

1. Topband: Effect of Trees (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Sun, 3 Dec 2006 10:20:55 -0800; I know this has been discussed before, but mostly in the context of verticals in heavily wooded areas. I am wondering if anyone has thoughts on having just a couple of trees very close to a vertical; /archives//html/Topband/2006-12/msg00018.html (7,962 bytes)
2. Re: Topband: Effect of Trees (score: 1): Author: "Mark Lunday, WD4ELG" <mlunday@nc.rr.com>; Date: Sun, 3 Dec 2006 16:34:42 -0500; Mike Although I am an antenna enthusiast and EE by training, I am not expert on this topic...however, I have been doing some reading. IEEE did some research at VHF freqs http://ieeexplore.ieee.org/Xp; /archives//html/Topband/2006-12/msg00022.html (8,764 bytes)
3. Re: Topband: Effect of Trees (score: 1): Author: "EP Swynar" <gswynar@durham.net>; Date: Sun, 3 Dec 2006 16:21:16 -0500; On 3rd December Mike wrote... Hi Mike, It always astounds me how we all seem to harbour deep dark suspicions in the matter of placing vertical antennas near trees (non-conductors), yet we don't hesit; /archives//html/Topband/2006-12/msg00025.html (8,251 bytes)
4. Re: Topband: Effect of Trees (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 03 Dec 2006 15:09:54 -0800; You might also add 1) The very nice antenna systems of some big 160 stations. Take a look at the links for K9DX and N6RO, for example. 2) It's worth running HFTA on your site. 3) The high noise level; /archives//html/Topband/2006-12/msg00026.html (9,323 bytes)
5. Re: Topband: Effect of Trees (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Sun, 3 Dec 2006 14:34:17 -0800; The counter argument to that, Eddy, is that although a metal tower can distort the pattern, it won't neccessarily convert a large portion of TX power into heat, whereas anything that is a lossy condu; /archives//html/Topband/2006-12/msg00027.html (9,018 bytes)
6. Re: Topband: Effect of Trees (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Sun, 3 Dec 2006 19:29:20 -0800; Chet, There is a diagram of the proposed radial layout at the following link: http://www.dellroy.com/W4EF's-Ham-Radio-Page/Radial_Project/Radial.htm The back yard is fully populated as shown in the d; /archives//html/Topband/2006-12/msg00036.html (9,354 bytes)
7. Topband: effect of trees (score: 1): Author: "Rudy Severns" <rudys@ordata.com>; Date: Mon, 4 Dec 2006 09:25:05 -0800; I noticed no one has mentioned Carl's (K9LA) March/April 2006 NCJ article on the effect of forest on low band operation. I got ahold of the two technical papers he references by Tamir which are the b; /archives//html/Topband/2006-12/msg00049.html (8,009 bytes)
8. Topband: Effect of trees (score: 1): Author: Robert Kavanagh <73rjkosz@sympatico.ca>; Date: Tue, 6 Aug 2013 13:32:55 -0400; But, Carl, there may be other variables changing in the system, for example, the amount of moisture in the ground. So it's not a controlled experiment. Bob VE3OSZ Every autumn (when the fluid is leav; /archives//html/Topband/2013-08/msg00078.html (7,348 bytes)
9. Re: Topband: Effect of trees (score: 1): Author: Guy Olinger K2AV <olinger@bellsouth.net>; Date: Tue, 6 Aug 2013 13:44:57 -0400; In general, without knowing any details, it could simply be an indication of insufficient radials with a large seasonal change in ground moisture. If however during the dry season there is no change; /archives//html/Topband/2013-08/msg00079.html (7,437 bytes)
10. Re: Topband: Effect of trees (score: 1): Author: Carl Jonsson <carl.jonsson7@gmail.com>; Date: Tue, 6 Aug 2013 20:33:30 +0200; The difference between winter and spring/ autumn and winter usually is very distinct up here and moisture is quite constant throughout the year. I have noticed that I have to adjust the phasing when; /archives//html/Topband/2013-08/msg00080.html (8,440 bytes)
11. Re: Topband: Effect of trees (score: 1): Author: Guy Olinger K2AV <olinger@bellsouth.net>; Date: Tue, 6 Aug 2013 14:59:04 -0400; Ah, assuming you mean zero centigrade, and therefore the transition from wet soil to frozen soil... Frozen soil can be quite different at RF than wet soil. I have some startling stories from Minnesot; /archives//html/Topband/2013-08/msg00081.html (10,212 bytes)
12. Re: Topband: Effect of trees (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 6 Aug 2013 15:05:01 -0400; <<<The difference between winter and spring/ autumn and winter usually is very distinct up here and moisture is quite constant throughout the year. I have noticed that I have to adjust the phasing wh; /archives//html/Topband/2013-08/msg00082.html (8,061 bytes)
13. Re: Topband: Effect of trees (score: 1): Author: Gary and Kathleen Pearse <pearse@gci.net>; Date: Tue, 06 Aug 2013 11:27:45 -0800; It's that time of year when trees and temps become Topband topic. Propagation must be poor. Until the supporting tree blew down, my Inv-L for 160 required shortening of the L in the Fall when the sup; /archives//html/Topband/2013-08/msg00083.html (8,333 bytes)
14. Re: Topband: Effect of trees (score: 1): Author: "ZR" <zr@jeremy.mv.com>; Date: Tue, 6 Aug 2013 18:53:38 -0400; Its been shown on here and elsewhere, by many and many times, that once beyond a modest radial field the field strength goes up marginally to the classic 128. Ive stressed many times that a mesh scre; /archives//html/Topband/2013-08/msg00088.html (9,163 bytes)

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