An AM radio tower only has to support the tower and its wind load.
I think marketing comes into play for the 80%. ie what practical length
guy base, #, and placement maximizes the tower antenna sq ft load
rating. If I were Tim Rohn that is what I would ask the engineers to
specify for the amateur community.
Grant KZ1W
On 12/5/2018 8:30 AM, Courtney Judd wrote:
There is a commercial tower not far from me that has been up for many
years.... an old AM unit now with some cell antennas on it. I marvel at
it ever time I drive by wondering how it has stayed up this long. It is
150 ft tall with the guy wire ground spots at 50 ft from the tower....
defies all logic but somebody way back when thought it was a good idea
and so far so good! lol 73's Cort K4WI
Grant Saviers <mailto:grants2@pacbell.net>
Wednesday, December 05, 2018 10:17 AM
Except that a PE can change this with the proper analysis. Also, a
post plus deadman end is a way to geometrically shorten the 80%. Look
at commercial guyed towers and they often have a shorter guy anchor to
base perecent (ie steeper guy angles).
Grant KZ1W
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