[TowerTalk] Planning tool query

[Al Waller, K3TKJ]

Dick Dievendorff wrote:
>
> What sorts of planning tools do people use to determine if the antennas of
> various turning radii will clear guy wires? 
>
>  
>   

Formula to calculate clearance for rotating antennas under guy wires:


tr = g(h-a)
 ------
h


where:


tr = allowable turning radius

g = distance from the tower base to the anchor of the guy

 wire you are trying to clear.

h = height on the tower where the guy wire you are trying to

 clear attaches.

a = antenna height


example:

100 foot tower, two sets of guy wires anchored 80' from base.

You are trying to clear the top guy, which is at the 100' level,

for an antenna at 51 foot height.


tr = 80 (100 - 51)
 -------------
100


tr = 39.2' allowable turning radius

73, Al K3TKJ