At 04:28 PM 1/22/2008, K7LXC@aol.com wrote:
>In a message dated 1/22/2008 6:56:43 A.M. Pacific Standard Time,
>towertalk-request@contesting.com writes:
> > When I put up my 97-foot Rohn 25 tower on a pier pin base (my first and
>only experience of this kind), the experienced tower builders who were
>helping me said absolutely nothing about plumbing the tower with any kind
>of instrument. When it was up and all three guy sets were installed, one
>guy stood at the base looking up the tower while 3 others adjusted the
>turnbuckles at the guy anchors to get it approximately straight and
>vertical. Once it looked OK, each one tightened his turnbuckle by the same
>number of turns until the guy tension (measured with a Loos Gauge) was
>correct.
>
> > I am wondering how important all this emphasis on precision really is?
>
> Well, the vertical tolerance spec per the TIA-222 is 3" per hundred
> feet. Some people are just more particular than others.
>
>Cheers,
>Steve K7LXC
>TOWER TECH
>
>
Frankly, specs like that strike me as implausible, or - perhaps worse -
intended to give the tower manufacturer an "out" in any failure. For
example, with Rohn 25, the guy spacing is approximately 30 feet, or 3
sections. I don't even see how you would go about getting a 3" bow out of
the run between guys.
73, Pete N4ZR
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