Duane, the guy tension is only a fraction of the downward force created by
a 90 MPH wind storm blowing on the structure and antenna load. 25G sections
are rated for about 7,000 pounds vertical load.
Still though, adding too much guy tension is not a good thing. The tension
can be estimated by formula based on guy length and sag if one doesn't wish
to invest in a tension measuring device. Google will turn up information
on this.
Yes, 390 pounds is the correct tension for 3/16"EHS cable,
73,
Gerald K5GW
In a message dated 2/6/2016 9:42:04 A.M. Central Standard Time,
bw_dw@fastmail.fm writes:
I believe it the case that tower manufactures recommend guy-wire tension
to be 10% of the lines breaking strength?
In that case, assuming that 3/16th line is common for Rohn 25 towers
etc, and has a BS of 3900lbs, then one would set the guy tension to
390lbs?
And there is some concern about tower failure due to downward
compression from over-tightening?
I believe the AB-621 instructions specify 200lbs as the guy line
tension.
I'm wondering if those who have setup the military masts like the AB-621
follow this or some other rule?
I want to make sure I've got guy line tension well established.
Thanks,
Duane
--
Bw_dw@fastmail.net
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