[TowerTalk] guy wire clearance

[Mike Gilmer - N2MG]

This is a simple geometry problem using similar triangles (no trig!).

GH = Guy Height (height of attachment point on tower)
AH = Antenna Height
GD = Guy Distance (distance from tower to guy anchor)
TRmax = maximum turning radius (the answer!)

TRmax = GD( (GH-AH)/GH )

which "simplifies" to:
TRmax = GD( 1-(AH/GH) )

Of course, your antenna does not turn about the center of the tower, so you actually have less room than TRmax (by an amount equal to the distance from the tower to the antenna's mast).  A swinging gate lowers TRmax in the same way, also.

If your numbers are really close, I'd also worry about guy sag and wind.  Don't split hairs!

Hope this helps.

Mike
N2MG


On Fri, 29 September 2000, Bruce Makas wrote:

> 
> 
> I recall that there is a simple formula that lets you know when an antenna
> will clear guy wires but I can't find it. Variables include antenna turning
> radius, height of antenna, height of guy wire connection and distance from
> base to ground guy point. Does any one have this formula handy?
> 
> 73, Bruce
> 
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