I hope your new AB-105 tower is on schedule and progressing well!
As K7LXC always (correctly) states, "do what the manufacturer says."
Unfortunately you can't really do that with AB-105, but perhaps we should
trust Rohn instead...
All of the drawings in the Rohn catalog specify use of 3/8" heavy
duty thimbles with 1/4" Big Grips (for example, their parts lists for Rohn
45, 55 and 65 towers).
Also, the Rohn catalog listing for "Guy materials" states:
5/16" Heavy duty wire rope thimble, open
(for 3/16" wire with Big Grips)
3/8" Heavy duty wire rope thimble, open
(for 1/4" wire with Big Grips)
Preformed Line products sez the minimum seat diameter for the big grip is
1.125 inches. I guess you could measure the diameter of the 5/16" thimble
to see if its big enough. The next issue is thimble collapsing strength,
unfortunately I do not know the collapsing strength of the two sizes of
heavy duty thimble in question... The data should be in Federal
Specification FF-T-276b Type III.
On Mon, 29 Sep 1997, J.P. Kleinhaus wrote:
> > BTW, in case you are wondering, for 1/4" EHS, you need 3/8" heavy duty
> > thimbles. (The thimble is always 1/8" larger than the cable size)
> Not according to my information. I spoke with National Tower, in KS,
> week and they said that you use a thimble 1/16" larger than the cable.
> They recommended a 5/16" thimble for use with 1/4" EHS.
> 73, J.P.
> J.P. Kleinhaus, W2XX (fdba AA2DU)
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