When the Catenary weight of 1/4" EHS changes the angle of the torque
bar to destroying the bracket VS resisting twist it all makes
sense... Adding larger shackles compounds the issue.
Likely not an issue with your short tower but worth a call to Rohn.
Ron, WV4P
On Fri, Jun 9, 2023 at 8:21 PM Steve Maki <lists@oakcom.org> wrote:
That's idiotic, or at least short sighted.
Use the biggest pin shackle that will fit in the torque arm, and
1/4"
big grips (preforms) with thimble in the shackle. This makes it
easy to
remove a guy wire temporarily whenever needed.
As has been pointed out often, the torque arms don't do much for
rotational resistance, but if you have them, use them. It makes a
nice
install.
-Steve K8LX
On 2023-06-09 8:34 PM, Mike H 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-tb45d.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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