[TowerTalk] How critical is the 120 degree ...

[Jari Jussila]

Hi ...

I'm sure these topics have been discussed earlier, but could not find 
any thread ..... Sri ...

We are at our club erecting two towers. A rotating steel tower being 31 
m high and a aluminium telescope mast 18+18 m = 32 meters.


A) How critical is the rule that guy wires should be "exactly" 120 
degrees apart?
A professional guide says, that the anchor point can be 50 mm from that 
120 degree (119,9-120,1 degree) but some say, that a maximum of two 
degrees is OK. That meaning 118-122 degree.

What's the tower community advise?


B) The steel tower height is 31 m - it's a rotating tower - but the 
upper bearing is at 23 m ( leaving 8 meters for the antennas) and the 
lower bearing at 11 meters.

Whats the advise of anchor point distance? Some say, that the 60 % 
(distance for  the tower) should be calculating from the total height 
(31 x 0,6 = 18,6 meters).
Some say, it should be calculating from  the upper bearing (23 m x 0,6 = 
12.8 m)

Whats your opinion?

Jari, OH2BU
For OH3AC Club Station

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