I used a single shackle at each end of the 6700 Philly for my tower. All
shackles are marine-type stainless steel. The top plate of the tower would
not accept the large shackle, so I used SS snap rings (similar to
carabineer) between shackle and plate. There are a few snaps here:
http://www.dutson.net/transfer/HamRadio/TowerGuys/
Keith NM5G
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Ron Hylton
Sent: Wednesday, February 23, 2005 11:29 AM
To: TowerTalk@contesting.com
Subject: [TowerTalk] Big Grip & Shackle Questions
All -
I had a couple of questions for my Rohn 45 project that uses Phillystran
HPTG 6700I and the associated Big Grips designed for Phillystran.
If you look at the Phillystran Technical Bulletin 105-4/96 for Amateur
applications, it shows "articulated hardware", where back-to-back shackles
are used to connect to the tower plate (looks like a torque arm) and to the
anchor. What is the motivation behind this? Is there a problem with just
using 1 shackle to attach to the torque arm?
My other concern is the statement in the Preformed Line Products literature
about the collapse of the thimble if you don't use big enough diameter
hardware. Because of the hole size in the torque arms I'm using, I'm forced
to use a 3/8" shackle. This is a pretty small diameter compared to the
large thimble used with the Phillystran. PLP suggests placing a piece of
pipe over the shackle pin to remedy this, but I've never heard of anybody
doing this.
Maybe I'm just a worry wart, but I thought I'd see what the group has to say
about these issues. By the way, the Phillystran will terminate at a 502
insulator at the lower end, and 1/4" EHS will complete the trip down to the
ground for the last 15' or so.
Thanks and 73,
Ron AD7L
Hillsboro, Oregon
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
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