In a message dated 1/22/2008 2:53:29 P.M. US Mountain Standard Time,
xdavid@cis-broadband.com writes:
Three inches out of 100 feet also requires an accuracy of 0.3 inches for
a plumb bob string hung from a 10 foot section of tower.
Three inches out of 100 feet calculates out to be a total angle of 0.14
degrees. By that criteria, the 0.1 degree resolution of the digital
angle gauge I used doesn't seem like that much overkill. I guess I'm
just one of the particular ones ...
http://i228.photobucket.com/albums/ee141/xazdave/HD-70_Tower_Leg_Angle_89r1Deg
rees.jpg
73,
Dave AB7E
Dave;
Steve was quoting EIA/TIA-222 as it pertains to guyed towers (deviation from
true vertical no more than 1 part in 400 or 3" in 100'). For self supporting
towers, like yours, the spec calls for max deviation to be no more than 1
part in 250, or roughly 4.8"in 100 ft, i.e. 3.36" for your 70 foot AN Wireless
tower. ;-)
73, Bob K8IA
**************Start the year off right. Easy ways to stay in shape.
http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|