Scott,
It may depend on the vintage of the Phillystran.
I just measured some HPTG4000 (3/16" equiv., uses preforms for end
termination; this is still new, on the reel) and some older 1/4" equivalent
that used the potted ends (was in use for several years). Both measured
just under 8 mm (about 5/16"). It appeared the HPTG4000 had a slightly
thicker jacket than the older stuff.
Rohn book says 3/16 is OK for all guys on 120 feet of Rohn 45 in 70 mph
wind load, but in 90 mph load zone they call for 1/4 inch on the top guys
and 3/16 on the two lower sets.
73/Jon AA1K
At 07:20 PM 9/11/02 -0700, you wrote:
>
>K4JNY and I are building yet another tower at his place, this one
>a Rohn 45. We have acquired some Phillystran that formerly was
>holding a 100' Rohn 25 up until we pulled it all down last year.
>
>There is info about breaking strength for Phillystran, but nothing
>I can find that shows breaking strength vs. diameter. According
>to the calipers, what we have is .26". What I can't tell is how
>to find out what the breaking str is for this.
>
>Questions: Will this Phillystran, terminated to 1/4" EHS guy wire
>at the ends be adequate for holding up a 120' Rohn 45 tower done
>'by the Rohn book' for engineering and not overloaded with
>antennas? Where can I locate diameter vs. breaking strength
>table for Phillystran?
>
>Scott W4PA
>
>__________________________________________________
>Do you Yahoo!?
>Yahoo! News - Today's headlines
>http://news.yahoo.com
>_______________________________________________
>Self Supporting Towers, Wireless Weather Stations, see web site:
http://www.mscomputer.com
>Call 888-333-9041 to place your order, mention you saw this ad and take an
additional 5 percent off
>any weather station price.
>_______________________________________________
>Towertalk mailing list
>Towertalk@contesting.com
>http://lists.contesting.com/mailman/listinfo/towertalk
>
|