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[Towertalk] Tree Mounts

 To: [Towertalk] Tree Mounts jon.zaimes@dol.net (Jon Zaimes AA1K) Fri, 06 Sep 2002 22:17:51 -0400
 Steve, How long does the tree last after topping? Won't that kill it? Do you install steps for future access for maintenance? How about using a Ring Rotor -- anyone tried this? I have lots of 80 ft. pines.... 73/Jon AA1K At 08:16 PM 9/6/02 EDT, you wrote: >In a message dated 9/6/02 5:00:39 PM Pacific Daylight Time, >kellyjohnson@telocity.com writes: > >> Does anyone out there have any experience with mounting a rotatable yagi >> to a tree? I've been told this is (or used to be) common in the Pacific >> Northwest. I'd be interested in hearing: >> 1) How to calculate a safe load > > Calculate? How would you come up with a formula for the tree capacity? > > I've installed 14-15 antennas in trees including HF yagis and 2L 40M >beams so I have a professional perspective but don't have any numbers to show >you. > > I usually top the tree when it's about 10 or so inches in diameter. How >strong is an 8x8 piece of wood? Pretty danged strong actually. > > If you're talking about an HF beam, I wouldn't go any larger than about a >16' or so boom - the forces just get too big. > > The other limiting factor is rotator capacity since I pipe mount the >rotator and then the antenna on top of it. I prefer the T2X since it has a >lot of mast mounting capacity and will twirl just about anything small to >moderate in size for a long time. > >> 2) How to fabricate a suitable mount > > I use a piece of galvanized pipe (1-1/2" ID = 1.9" OD) with a horizontal >piece welded to it (picture a cross). The horizontal ends are bolted to the >tree as is the vertical pipe. The rotator goes on top of the cross. I use >1/2" lag screws on the vertical pipe - 3-4 of them - and screw them right >into the tree. The antenna will blow away before the mount fails. > > A BIG advantage for a tree installation is that it's UNREGULATED when it >comes to building departments! I charge a lot for them because they're dirty >and a lot of work. > >Cheers, >Steve K7LXC >TOWER TECH - >Professional tower (and tree) services for commercial and amateur >_______________________________________________ >Self Supporting Towers, Wireless Weather Stations, see web site: http://www.mscomputer.com >Call 888-333-9041 to place your order, mention you saw this ad and take an additional 5 percent off >any weather station price. >_______________________________________________ >Towertalk mailing list >Towertalk@contesting.com >http://lists.contesting.com/mailman/listinfo/towertalk >
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