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Total 8 documents matching your query.

1. Topband: Antennas in trees (score: 1): Author: "Tom Boucher" <tom@telemetry.demon.co.uk>; Date: Wed, 14 Nov 2007 18:50:23 -0000; Andreas Trees are not ideal antenna supports because it is not easy keeping the wire away from branches. This autumn my inverted 'L' gradually moved it's resonant frequency up the band by about 20 KH; /archives//html/Topband/2007-11/msg00102.html (7,597 bytes)
2. Re: Topband: Antennas in trees (score: 1): Author: "EP Swynar" <gswynar@durham.net>; Date: Wed, 14 Nov 2007 18:26:53 -0500; On 14th November, Tom wrote... "...Eddy VE3CUI suggested that a lossy tree is better than a mast - not true Eddy because the tree is resistive and any RF current induced in it will be dissipated as I; /archives//html/Topband/2007-11/msg00106.html (7,980 bytes)
3. Re: Topband: Antennas in trees (score: 1): Author: "W2RU - Bud Hippisley" <W2RU@frontiernet.net>; Date: Wed, 14 Nov 2007 18:41:19 -0500; Eddy VE3CUI suggested that a lossy tree is better than a mast - not true Eddy because the tree is resistive and any RF current induced in it will be dissipated as I squared R heat. A metal mast on th; /archives//html/Topband/2007-11/msg00107.html (7,690 bytes)
4. Re: Topband: Antennas in trees (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Wed, 14 Nov 2007 18:51:23 -0500; That is interesting. The NW element of my four square always measured slightly higher in feed impedance than the other three elements. That element was about 50 feet or less from three large Pecan t; /archives//html/Topband/2007-11/msg00108.html (8,316 bytes)
5. Re: Topband: Antennas in trees (score: 1): Author: Gary and Kathleen Pearse <pearse@gci.net>; Date: Wed, 14 Nov 2007 17:04:43 -0900; Here's some info of interest regarding antennas and trees from K9LA that may have already been discussed: http://mysite.verizon.net/k9la/sitebuildercontent/sitebuilderfiles/ low-band-antennas-and-tre; /archives//html/Topband/2007-11/msg00113.html (8,443 bytes)
6. Re: Topband: Antennas in trees (score: 1): Author: "Bob Eldridge" <eldridge@direct.ca>; Date: Wed, 14 Nov 2007 19:03:49 -0800; Hi Eddie: If you excite a lossy tree the RF is dissipated. If you excite an adjacent mast the RF flows and the mast radiates - it will destroy or enhance the pattern but it will radiate. The RF in a; /archives//html/Topband/2007-11/msg00114.html (7,916 bytes)
7. Topband: Antennas in trees (score: 1): Author: Ken Brown <ken.d.brown@hawaiiantel.net>; Date: Wed, 14 Nov 2007 18:27:03 -1000; Trees no doubt absorb some RF. Those of us who use trees as supports often do so because they are our best option. If you have towers use them, and if you have trees and no towers, by all means use t; /archives//html/Topband/2007-11/msg00115.html (8,335 bytes)
8. Re: Topband: Antennas in trees (score: 1): Author: "Tom Boucher" <tom@telemetry.demon.co.uk>; Date: Thu, 15 Nov 2007 08:41:54 -0000; Tom My antenna was actually touching the branches - I had pulled it in close to get a maximum height of about 83'. I have only pulled it away by a few feet to miss the branches but my measurements sh; /archives//html/Topband/2007-11/msg00117.html (8,174 bytes)

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