I find it amazing that any ham would not want to ensure that his/her antenna
system is safe!
Without knowing the mechanical details of the house mount (the loads and
capability of the house and the mount), the number of proposed guy levels
above the house, etc, etc, this reflector gives advice on size/type of guy
anchor and depth/quantity of concrete, and more! Simply amazing.
You'd be surprised at what 1.25 Cu.Yd. of concrete will do in a guy anchor
hole.
Check out: http://users.erols.com/n3rr/guyanchors/index.htm
It's not the quantity of concrete that's the issue - it's the engineering
that goes into the calculation of the materials.
Julio, my advise is for you *not* to take the advise you see here, but
ensure you have a qualified P.E. design/review what you need before you do
anything. The tower is, after all, connected to your house!!
73,
Bill, N3RR
----- Original Message -----
From: "Steve Maki" <steve@oakcom.com>
To: <towertalk@contesting.com>
Sent: Wednesday, June 26, 2002 12:48 AM
Subject: Re: [Towertalk] Raised Guy Stays
> WL7E/W7 wrote:
>
> >> > I'm getting ready to extend the height of a 30' Rohn 25 bracketed
tower to
> >> > about 70' and I would like to use raised guy stays ( I think that is
what
> >> > they are called ) to get the guy wires above head height.
> >> The best material is I-beam (eye-beam, H-beam). It's much stronger
than
> >>round elevated guys.
>
> >> Put 60% of the guy in the ground and 40% above the ground and
you'll be
> >>in good shape.
>
> >I-beams are the way to go. But let's see here, guy wires above head
height
> >= say 6 feet. Therefore 40% of x = 6 feet. If I recall my algebra
correctly
> >x would = 15 feet. Which would equate to 9 feet in the ground? I think
this
> >is a bit much for any 70 foot tower. Put the i-beam in the ground 4 foot
> >with rebar and Johnson studs with concrete and it will hold anything you
> >want to put up. A 10 foot i-beam is plenty.
>
> Don't scrimp on the concrete though. In average soil it takes much more
> concrete than one might think to keep the post from slowly leaning over
> when under constant tipover force of a few hundred pounds at 6'. 2 or 3
> yards is NOT too much.
>
> --
> Steve K8LX
> _______________________________________________
> Towertalk mailing list
> Towertalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
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