[TowerTalk] 70cm band in jeopardy by HR 607

[D.G.]

Oh boy, looks like HR 607 is going viral.

http://www.youtube.com/watch?v=3T0Ol9J_jis

Just saw this today.

 


--- On Tue, 3/8/11, Jim Brown <jim at audiosystemsgroup.com> wrote:


From: Jim Brown <jim at audiosystemsgroup.com>
Subject: Re: [TowerTalk] Tower for Challenging Terrain
To: towertalk at contesting.com
Date: Tuesday, March 8, 2011, 11:57 AM


On 3/7/2011 3:05 PM, J.P. wrote:
> Having done this myself, the answer is sure you can put up a guyed tower on a slope.  What's important to maintain are the angles of the guys to the tower and the tension on them.  If you maintain the same angles relative to the tower, some will be shorter (uphill) and some will be longer (downhill) but other than that there's not any magic besides basic geometry.

Good advice.  I did exactly that with my tower, where the terrain slopes 
both a little and a lot, depending on directlon. I'm in a rather dense 
redwood forest. The guys going in one direction hit the ground 20 ft 
above the tower base, and in another direction, 15 ft below the tower 
base, but I held the specified angles.  It took me a year to find a spot 
where I could turn a beam with a 22 ft turning radius. I've got the 
specified 4 ft deep x 30 inches x 30 inches of concrete under it. It's 
too far from the road for a truck, so we mixed and poured on site, using 
a small mixer owned by some friends. Carried gravel and bags of cement 
about 350 ft in a wheelbarrow, ran a long hose and AC power down from 
the house. Took us about five hours. That's the only concrete I poured 
-- all the guys go to big lag screws a few feet above the base of very 
tall and massive redwoods (avg height 150 ft, 5 ft diameter). Each guy 
wire goes to a different tree. Guys are at four levels, so that's 12 
wires, 12 trees. (If you've got one redwood, you've got a lot of 
redwoods around it, because redwood trees have LOTS of children). 
Obviously, this won't work for everyone. :)  The tower is 120 ft of Rohn 
25.

Another VERY important consideration in irregular terrain is the 
stability of the soil -- that is, if it's on a slope, will two tons of 
concrete that you put in a hole stay there, or might it slide downhill?  
I'm about to install a second, shorter tower, about 40 ft, to hold 
monobanders for 10M and 15M.  One spot I was considering is on a fairly 
steep slope that didn't look sufficiently stable, so I'm going to use a 
different one.

73, Jim K9YC
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