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Total 10 documents matching your query.

1. Topband: Trees (not the N6TR kind) (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 31 Dec 2012 11:46:46 -0500; Pine trees taller than 100 feet could be an issue, since they could be near resonance and lossy - a sad combination when within a wavelength or so of vertically polarized antennas. If your trees are; /archives//html/Topband/2012-12/msg00633.html (8,791 bytes)
2. Re: Topband: Trees (not the N6TR kind) (score: 1): Author: "ZR" <zr@jeremy.mv.com>; Date: Mon, 31 Dec 2012 18:18:25 -0500; Pine trees taller than 100 feet could be an issue, since they could be near resonance and lossy - a sad combination when within a wavelength or so of vertically polarized antennas. If your trees are; /archives//html/Topband/2013-01/msg00002.html (10,853 bytes)
3. Re: Topband: Trees (not the N6TR kind) (score: 1): Author: Gary and Kathleen Pearse <pearse@gci.net>; Date: Mon, 31 Dec 2012 22:03:56 -0900; The following obs were an annual occurrence until my 85'+ support tree blew down this year. The 160 antenna described below was supported by the tree, and was no more than 4' from the trunk in the mi; /archives//html/Topband/2013-01/msg00005.html (8,321 bytes)
4. Re: Topband: Trees (not the N6TR kind) (score: 1): Author: "Richard Fry" <rfry@adams.net>; Date: Tue, 1 Jan 2013 06:13:16 -0600; As for the affect of trees on EM waves, below are the results of some simple measurements I posted earlier on another board. ___________________ Recording the relative readings on the dBľ and S/N dis; /archives//html/Topband/2013-01/msg00006.html (8,605 bytes)
5. Re: Topband: Trees (not the N6TR kind) (score: 1): Author: Gary and Kathleen Pearse <pearse@gci.net>; Date: Tue, 01 Jan 2013 10:32:29 -0900; Hi Dale and the Topband group. To trim the vertical portion, and return to original resonance every winter, I simply folded the wire closely back on itself in a flat bundle at the feed point and tape; /archives//html/Topband/2013-01/msg00010.html (9,888 bytes)
6. Re: Topband: Trees (not the N6TR kind) (score: 1): Author: Lew Sayre <w7ew@arrl.net>; Date: Tue, 1 Jan 2013 11:42:32 -0800; Yo 160M People, This discussion about trees is important. Primarily because I live on the top of a somewhat narrow ridge where I've already planted several towers. (50'-180' tall) I have several fir; /archives//html/Topband/2013-01/msg00011.html (12,001 bytes)
7. Re: Topband: Trees (not the N6TR kind) (score: 1): Author: Gary and Kathleen Pearse <pearse@gci.net>; Date: Tue, 01 Jan 2013 10:42:56 -0900; I used eight elevated tuned radials. They angled about 45 deg from about 4' at the feed to ~15' for their horizontal run. To initially tune, I used my MFJ-259 to feed a pair of radials (dipole), then; /archives//html/Topband/2013-01/msg00012.html (10,047 bytes)
8. Re: Topband: Trees (not the N6TR kind) (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Tue, 01 Jan 2013 12:02:08 -0800; On 2012-12-31 8:46 AM, Tom W8JI wrote: Years ago, when some fellow proposed that trees would radiate because they were fractals, I measured the RF resistivity of freshly-cut pine trees. I firmly atta; /archives//html/Topband/2013-01/msg00013.html (9,350 bytes)
9. Re: Topband: Trees (not the N6TR kind) (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 1 Jan 2013 22:35:47 -0500; I recall comments at a hamfest talk several years ago from Roy, W7EL, that his two-element 40m vertical array appeared to have an unintended null in the direction of a stand of evergreen trees not to; /archives//html/Topband/2013-01/msg00015.html (9,054 bytes)
10. Re: Topband: Trees (not the N6TR kind) (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Wed, 02 Jan 2013 09:47:05 -0800; There ARE such things -- my redwood forest is quite dense -- I'd guess more than 100 of them, plus a lot of smaller ones, in 8 acres, ranging from about 100 ft to more than 175 ft, and from 2 ft to 6; /archives//html/Topband/2013-01/msg00017.html (9,885 bytes)

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