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Re: [TowerTalk] 70cm band in jeopardy by HR 607

Subject: Re: [TowerTalk] 70cm band in jeopardy by HR 607
From: "D.G." <>
Date: Tue, 8 Mar 2011 16:56:27 -0800 (PST)
List-post: <">>
Oh boy, looks like HR 607 is going viral.

Just saw this today.


--- On Tue, 3/8/11, Jim Brown <> wrote:

From: Jim Brown <>
Subject: Re: [TowerTalk] Tower for Challenging Terrain
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 

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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