Hi Jim and all,
The Friction Saver or the Cambium Saver is a very interesting device. It
probably takes a little practising to use it efficiently. :-)) It wasn't
that easy to find the instructions so here is the link
http://www.buckinghammfg.com/instructionsandwarnings/FRICSAVE.pdf
73 Bert, VE3OBU
PS. Jim, thanks for the info about wire antennas for limited use. Much
appreciated!
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Jim Brown
Sent: Saturday, August 30, 2008 9:43 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Dipole Ends
On Fri, 29 Aug 2008 14:58:44 -0500, Tim N9PUZ wrote:
>what is a
>good technique for attaching to the tree trunk? Screw eye into
the
>trunk itself? Some sort of belt type affair around the trunk?
All of my antennas are hung in tall trees -- redwoods, Douglas Fir, madrones
-- so I've researched this issue a lot. The executive summary is that
screwing a eye or hoot lag bolt into or through the tree trunk is the least
invasive for the tree, and is the method of attachment recommended by tree
experts. It's also the most expensive, because you've got to hire a climber
to get it there.
I also endorse the use of marine pulleys and a good counterweight.
Some have used old window weights. My antennas are up higher, fed with RG11,
and are rather long, so I need about 100# tension. I bought 6.5 gal water
jugs and filled them with dry sand (roughly 1.5x the specific gravity of
water). I also try to use very robust construction techniques. #10 copper,
either bare or insulated THHN (house wire) and the most robust center and
end insulators I can find. I use the 5/16 inch rope that DX Engineering
sells.
W3DQ found a product called a Cambium Saver. It's a fabric sleeving system
that fits over a big branch. He described it in a very nice presentation he
did at Visalia this summer. It's an alternative to the lag bolt/screw
method, and can be pulled up with a rope that you have launched into the
tree.
73,
Jim Brown K9YC
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