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Re: [TowerTalk] EHS cable and torque bars

To: towertalk@contesting.com
Subject: Re: [TowerTalk] EHS cable and torque bars
From: Steve Maki <lists@oakcom.org>
Date: Sat, 10 Jun 2023 20:33:01 -0400
List-post: <mailto:towertalk@contesting.com>
I was shocked yesterday when I saw the pricing. But any of the Rohn torque bars I've seen over the last 50 years are plenty strong enough to handle 1/4" EHS, I guarantee.

The 3/16" EHS limit may be something as simple as the hole size in the bar. If you look at specs for preforms, 1/4" requires a 1/2" thimble and minimum 1" pin. 3/16" only requires a 5/8" pin.

But look, the OP is installing a 50' tower. We tend to go overboard sometimes around here.

-Steve K8LX

On 2023-06-10 12:30 PM, john@kk9a.com wrote:
$325 each, Rohn is very proud of their torque bars.  In my opinion they do
little to resist tower twisting.
I think you'll have to ask Rohn why there is the 3/16 EHS limit.  I had an
issue once and Rohn was very responsive. Is it possible they are not rated
for 6,000#?  I believe a good 3/8 shackle is.

John KK9A



Mike WB2FKO wrote

I acquired some used Rohn 45G in very good shape and will be going up 50
ft. Antenna will be stacked 2 x 9-el for 2m. I'm following the Rohn
engineering guidance very closely: base is a new R-SB45G buried in the
prescribed concrete block along with GAR30 guy anchors, also in
concrete. I have the older style guy bracket for 45G that has (very
expensive!) TB45D torque bars
<https://www.3starinc.com/rohn_45g_torque_bars_for_use_with_guy_bracket_r-tb 45d.html> along with several hundred feet of brand-new 1/4 in EHS for the guys.
According to the Rohn instructions, however, I can't use EHS cable
that's greater than 3/16 in:

https://www.3starinc.com/manuals/ROHN_Torque_Bar.pdf

This means I'd have to buy either smaller EHS cable or their newer guy
bracket that doesn't use torque bars. I'll do this if I have to, but I'd
sure like to understand why 1/4 in EHS is a deal-breaker for the torque
bars. QTH is north Florida so I want to make the setup as storm-proof as
practical. Any insight appreciated.

Mike WB2FKO

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