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Re: [TowerTalk] Rohn 55 thimbles and turnbuckles

To: <donovanf@starpower.net>, <towertalk@contesting.com>
Subject: Re: [TowerTalk] Rohn 55 thimbles and turnbuckles
From: "Dick Green WC1M" <wc1m@msn.com>
Reply-to: wc1m@msn.com
Date: Thu, 31 Aug 2006 03:19:45 -0400
List-post: <mailto:towertalk@contesting.com>
Frank,

Glad you weighed in on this.

I got 1/2" thimbles for the Preformed Grips I'm using with the 6700 lb
Phillystran -- as specified on the Texas Towers website. So far, so good.

But I ordered 3/8" heavy-duty thimbles for the 1/4" EHS bottom leaders
because that's what Rohn specifies for use with their 1/4" EHS Big Grips
(part # BG2144.) Here's a link to the parts list in the Rohn catalog:

http://www.antennasystems.com/PDFs/ROHN/55G/55G-14.pdf

I'm using 6700 lb Phillystran with 1/4" EHS leaders on all three guys, which
isn't quite up to the 110 MPH spec (the top guy is supposed to be 5/16"),
but exceeds the 90 MPH spec. The parts list shows BG2144 grips and 3/8"
thimbles for the 1/4" EHS. Is there a difference between Rohn Big Grips and
Preformed Big Grips?

Do you think the Rohn-specified 3/8" thimbles are OK for their 1/4" EHS
grips? If so, would you still use a 7/16" shackle, or something smaller?
What's a good source for high-quality shackles? Would you recommend using
shackles to connect the 1/2" thimbles at the end of the Phillistran grips to
the solid links on the GA55GD guy brackets? Here's a diagram of the bracket:

http://www.antennasystems.com/PDFs/ROHN/hardware_accessories/HA-79.pdf

The 1/2" thimble should fit inside the loop OK, but a shackle would make
installation and removal easier.

73, Dick WC1M

-----Original Message-----
From: donovanf@starpower.net [mailto:donovanf@starpower.net] 
Sent: Wednesday, August 30, 2006 9:00 PM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Rohn 55 thimbles and turnbuckles

Dick,

1/2" heavy duty thimbles are required by Preformed Line Products for use
with their Big Grips for 1/4" guy wire and Phillystran.  

See:
http://www.preformed.com/artsfest/files/AppProc/SP2049-3.pdf
http://www.preformed.com/artsfest/files/AppProc/SP2806.pdf

Use a 7/16" shackle to make the transition from the thimble to the
turnbuckle.

73!
Frank
W3LPL

---- Original message ----
>Date: Wed, 30 Aug 2006 19:47:29 -0400
>From: "Dick Green WC1M" <wc1m@msn.com>
>Subject: [TowerTalk] Rohn 55 thimbles and turnbuckles
>To: "Tower" <towertalk@contesting.com>
>
>Reviewing the Rohn parts list for a 110? 55G tower @90-100MPH, I 
>decided to go with ¼? EHS for all three levels (actually, 6700lb
Phillystran with ¼?
>EHS leaders. Following the parts list, I ordered 3/8? heavy-duty 
>thimbles
>(3/8THH) and ½?x12? eye-jaw turnbuckles (1/2TBE&J). Rohn specifies that 
>the thimble should be one size larger than the guy diameter. The parts 
>have arrived, and I?m perplexed to find that the 3/8? thimbles don?t 
>fit inside the eye part of the turnbuckles. I might be able to make 
>them  fit by flattening the edges of the thimble a bit (sandwiching it 
>between a piece of two pieces of flat steel and hammering the flare out 
>of the edges), but before I try that, I?d like opinions on this. I 
>can?t be the first person who has run into this. It looks like a 
>shackle would work, but Rohn doesn?t specify them for 55G towers. Comments?
>
> 
>
>73, Dick WC1M
>
> 
>
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