There is a lot of leverage on elevated anchors and I would avoid using them
unless really necessary. You could move the downhill anchor further away
from the tower base to maintain the guy angle. I have seen installations
(including my own at http://www.qr.com/db/p40a ) where guy wires were are at
very different angles and distances from the base.
John KK9A
To: "Tower and HF antenna construction topics." <towertalk@contesting.com>
Subject: Re: [TowerTalk] Downhill anchors
From: "Gene Smar"
Date: Mon, 25 Jan 2010 16:59:59 -0500
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Ed:
Besides extending the length of the downhill guy, you might consider
using an elevated guy anchor. This is a steel I-beam of appropriate
dimensions embedded in enough concrete to resist overturning when the wind
blows against the guy wire. Its length would be tall enough so that enough
is embedded in the concrete and enough is sticking out above ground so you
can attach your guy wire anchoring devices.
Rather than point you to other Hams' examples, I suggest you do a web
search on elevated guy anchors and see what comes up.
A final point: you need an engineer to design this thing. Don't rely
on my flimsy description (note my use of the deliberately indeterminate
adjective <enough>) or others that you may find on the Intergoogle. If the
anchor is done wrong, the tower will come down.
Caveat Amateur.
73 de
Gene Smar AD3F
----- Original Message -----
From: "Ed Swiderski, KU4BP" <ku4bp@triad.rr.com>
To: "Tower Talk" <towertalk@contesting.com>
Sent: Monday, January 25, 2010 1:00 PM
Subject: [TowerTalk] Downhill anchors
>
> After seeing my planned tower location become literally washed away. A
> flat
> area but considered a flood plane. (Got VERY flooded after weekend rain,
> almost a pond) I'm looking at putting my planned tower against my house.
> The
> thing that I am being puzzled about is how the land slopes down quite a
> bit
> away from the base. This is where one of the guy anchors will go. Is there
> some additional calculations that I need to do? I'm guessing that it is no
> more than 10 feet below where the base will be.
>
> I'm thinking that maybe I would have to keep the angles of the guys
> constant
> and just extend the length to the anchor to compensate for the drop in
> land,
> but I'm not sure. What I'm thinking is that if there is, say, 10 feet of
> drop. Using that and the angle required for the guys I can trig out the
> distance needed from the tower base. As I said, I'm guessing on what to
> do.
> Am I on the right track with my theory or am I off base?
>
> Thank you,
>
> Ed Swiderski KU4BP
>
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