[TowerTalk] Plumbing a tower

[Pete Smith]

At 04:28 PM 1/22/2008, K7LXC at aol.com wrote:
>In a message dated 1/22/2008 6:56:43 A.M. Pacific Standard Time, 
>towertalk-request at 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