I have a self supporting tower (AN Wireless) and apart from the fact
that it tapers more sharply, it has a wider base than an equivalent
guyed tower. The steel is also thicker, hence the additional cost. It
is also heavier as a result.
Tower gurus may differ but IMHO guy wires are totally unnecessary for
any self supporting tower unless you are overloading the tower or live
in a very high wind area. Not having guy wires brings a number of
advantages, including not wasting land space, raising/lowering
antennas is much easier, and you don't have to insulate/breakup metal
wires or deal with nonmetallic alternatives that can deteriorate in
UV.
Ryan, N2RJ
On Sun, Aug 15, 2010 at 6:35 PM, Steve Sala <k7awb@msn.com> wrote:
> What is it that makes a standalone tower stand alone? without guys? I have
> a used Heights tapered aluminum tower which I am going to install sort of
> close to the shack to put my Vhf/Uhf yagis on to minimize feedline length.
> Is it because the taper makes the shape sort of triangular which, I bet, is
> the most stable of geometric shapes (compared to a Rohn 25-45, etc. which
> all sections are non-tapered)?
>
> Would I affect anything by adding a set of guys so I don't panic as much
> when I climb it to install the sections and then the rotator and yagis?
> Even though the hole in the ground holding the three long bolts would be
> about 7 feet deep by 4 feet wide, minimizing movement is an objective while
> I am up there. I was thinking of three Phillystran guys that I connect to
> ground anchors when I am on the tower and then either removing them from the
> ground anchors for operation or keeping them on for extra stability.
>
> This Heights tower is going to be 60 feet tall although it originally was
> 112 tall. A friend topped it off later at 60 feet with a new flat plate so
> he it would not interfere with his astrophotography in his yard.
>
> 73
> Steve
> K7AWB
> Nine Mile Falls, WA
> DN17es
>
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--
Ryan A. Jairam,
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