236 views is far from viral.
Jim W7RY
--------------------------------------------------
From: "D.G." <indianaj0nes@yahoo.com>
Sent: Tuesday, March 08, 2011 4:56 PM
To: <towertalk@contesting.com>; <jim@audiosystemsgroup.com>
Subject: Re: [TowerTalk] 70cm band in jeopardy by HR 607
> 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@audiosystemsgroup.com> wrote:
>
>
> From: Jim Brown <jim@audiosystemsgroup.com>
> Subject: Re: [TowerTalk] Tower for Challenging Terrain
> To: towertalk@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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