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Total 20 documents matching your query.

1. TopBand: Trees and RF (score: 1): Author: cwhiffen@atl.mindspring.com (Clay Whiffen); Date: Wed, 11 Dec 1996 18:51:26 -0500; Guess I better speak up. I had a short letter in QST Technical Correspondance Nov '91 that addressed the effect of a tree on an adjacent vertical. You can reference that. In short, I had (still have,; /archives//html/Topband/1996-12/msg00199.html (7,531 bytes)
2. Topband: Trees and RF (score: 1): Author: "Jim Monahan" <K1PX@msn.com>; Date: Tue, 3 Nov 2009 13:33:01 -0500; I live in an environment that is rich with trees. Actually, it is close to being a "rain forest" It is a watershed area so there is a high water table with trees literally sitting on top of each othe; /archives//html/Topband/2009-11/msg00058.html (7,557 bytes)
3. Re: Topband: Trees and RF (score: 1): Author: Gary and Kathleen Pearse <pearse@gci.net>; Date: Tue, 03 Nov 2009 10:17:27 -0900; Around Halloween, and with the arrival of perpetual below freezing temps in northern KL7, we tree-hangers often see changes in our vertical antenna resonance. For example, my 160M Inv-L, vertically u; /archives//html/Topband/2009-11/msg00062.html (8,308 bytes)
4. Topband: Trees And RF (score: 1): Author: "Bruce" <k1fz@myfairpoint.net>; Date: Tue, 3 Nov 2009 16:01:09 -0800; Air cooled dummy load? US Army contractor paper on using trees _______________________________________________ 160 meters is a serious band, it should be treated with respect. - TF4M; /archives//html/Topband/2009-11/msg00068.html (7,187 bytes)
5. Re: Topband: Trees and RF (score: 1): Author: "Mel Crichton" <kj9c@iquest.net>; Date: Tue, 3 Nov 2009 16:23:05 -0500; Purely anecdotal here... I live in a pretty dense hardwood forest. The only clearing is where the house sits, where there's a 15 foot rooftop tower holding a 2 element quad.... tops of trees are 30 t; /archives//html/Topband/2009-11/msg00070.html (8,619 bytes)
6. Re: Topband: Trees And RF (score: 1): Author: Annas Alamudi <annas.alamudi@gmail.com>; Date: Wed, 4 Nov 2009 01:27:32 +0000; I recalled reading about US Army tests on using trees as antennas, but I thought they were for LF. A quick google on tree antennas gave me this: http://w5jgv.com/tree_antenna/index.htm which has link; /archives//html/Topband/2009-11/msg00085.html (7,274 bytes)
7. Re: Topband: Trees and RF (score: 1): Author: kl7ra@ptialaska.net; Date: Tue, 3 Nov 2009 16:38:42 -0900 (AKST); I may not have a better understanding but I lived about 20 miles from Gary's qth with a full size quarter wave vertical for 160 that did the same thing. Adding more radials stopped it and the antenn; /archives//html/Topband/2009-11/msg00086.html (7,557 bytes)
8. Re: Topband: Trees And RF (score: 1): Author: Guy Olinger K2AV <olinger@bellsouth.net>; Date: Tue, 3 Nov 2009 21:25:08 -0500; The antenna depicted on W5JGV's web page is a RX antenna setup and is apparently also for low MF. Though the owner might be quite satisfied with the "performance", if the premise was that trees are l; /archives//html/Topband/2009-11/msg00091.html (8,853 bytes)
9. Re: Topband: Trees and RF (score: 1): Author: Gary and Kathleen Pearse <pearse@gci.net>; Date: Tue, 03 Nov 2009 17:33:39 -0900; Earlier in this thread: Thanks for the reply Rich. I agree with the changing ground conductivity on a seasonal basis, such as ground conductivity is in Interior Alaska = poor at best I believe. But t; /archives//html/Topband/2009-11/msg00093.html (9,034 bytes)
10. Re: Topband: Trees And RF (score: 1): Author: Dan Zimmerman N3OX <n3ox@n3ox.net>; Date: Tue, 3 Nov 2009 23:48:06 -0500; "A quick google on tree antennas gave me this: http://w5jgv.com/tree_antenna/index.htm which has links to some stuff" I don't buy that that guy is actually loading a tree.... that is, I doubt he's co; /archives//html/Topband/2009-11/msg00097.html (9,081 bytes)
11. Re: Topband: Trees and RF (score: 1): Author: Jan Erik Holm <sm2ekm@telia.com>; Date: Wed, 04 Nov 2009 06:25:17 +0100; I have a 97 ft top loaded vertical partially supported by a tree, 60ft in the tree and 40ft above. I have 250 radials on the ground each about 160 ft long. I see absolutely no change in anything from; /archives//html/Topband/2009-11/msg00098.html (8,436 bytes)
12. Re: Topband: Trees and RF (score: 1): Author: Ross Primrose <n4rp@aiko.com>; Date: Wed, 04 Nov 2009 05:31:54 +0000; That's enough to give me serious wire envy hihi 73, Ross N4RP -- FCC Section 97.313(a) At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired commu; /archives//html/Topband/2009-11/msg00099.html (7,958 bytes)
13. Re: Topband: Trees And RF (score: 1): Author: "David J. Sourdis" <hk1kxa@hotmail.com>; Date: Wed, 4 Nov 2009 06:21:26 -0500; I read an article in 73 Magazine about 17+ years ago by a guy who loaded a tree, about 25' (7.62m) high. 3 to 4 meter long and 15 cm (6") diameter shaft and ovoid shaped leafy top. With a screw drive; /archives//html/Topband/2009-11/msg00104.html (11,896 bytes)
14. Re: Topband: Trees And RF (score: 1): Author: "Gene Smar" <ersmar@verizon.net>; Date: Wed, 04 Nov 2009 08:54:01 -0500; Gents: I've read some of the 'nam era papers on US Army loading up tree trunks and making successful contacts, etc. I'm not convinced that the radiation was not solely from the gamma wire itself, wit; /archives//html/Topband/2009-11/msg00107.html (8,737 bytes)
15. Re: Topband: Trees And RF (score: 1): Author: "David J. Sourdis" <hk1kxa@hotmail.com>; Date: Wed, 4 Nov 2009 10:37:09 -0500; I have no idea. Tree-antenna articles are scarce for sure. I dont have the issue with me, maybe a bunch of termites did. Will be good if you give us details on it and also show how fuzzy my memory is; /archives//html/Topband/2009-11/msg00115.html (16,427 bytes)
16. Re: Topband: Trees And RF (score: 1): Author: Guy Olinger K2AV <olinger@bellsouth.net>; Date: Wed, 4 Nov 2009 10:39:04 -0500; That's the real gorilla in the room, notable by its absence. Also note that the author of the web page was using it for RX below 1 Mhz. Didn't say a thing about breaking a pileup on 160 with it. My s; /archives//html/Topband/2009-11/msg00116.html (10,588 bytes)
17. Topband: Trees and RF (score: 1): Author: calle.jonsson@sverige.nu; Date: Wed, 4 Nov 2009 17:40:52 +0100 (CET); Trees definately have some impact on RF. When the trees are in leaves every spring I have to bring the oscilloscope outdoors and set the 90 degs phasing of my 2 el vertical array. Likewise when the l; /archives//html/Topband/2009-11/msg00121.html (8,261 bytes)
18. Re: Topband: Trees and RF (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Wed, 4 Nov 2009 08:46:39 -0800 (PST); I am absolutely convinced that tall trees next to a low band vertical have a very negative effect on my radiated signal. For the past 11 years, I have had the opportunity to live on 3 acres of land w; /archives//html/Topband/2009-11/msg00123.html (9,218 bytes)
19. Re: Topband: Trees and RF (score: 1): Author: Guy Olinger K2AV <olinger@bellsouth.net>; Date: Wed, 4 Nov 2009 17:22:21 -0500; What may be of more effect is the seasonal effect that forestation has on the water content of the ground by roots passing water on to the leaves for evaporation. The cooling effect of this evaporati; /archives//html/Topband/2009-11/msg00136.html (10,894 bytes)
20. Re: Topband: Trees And RF (score: 1): Author: DAVID CUTHBERT <telegrapher9@gmail.com>; Date: Wed, 4 Nov 2009 19:34:22 -0700; AntenneX had an article a few years ago on a tree antenna. Dave WX7G _______________________________________________ 160 meters is a serious band, it should be treated with respect. - TF4M; /archives//html/Topband/2009-11/msg00152.html (7,540 bytes)

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