[TowerTalk] EHS cable and torque bars

[Steve Maki]

It's often an efficiency of materials equation. Why use more steel than 
necessary for a given loading requirement.

-Steve K8LX

On 2023-06-09 10:10 PM, Mike H wrote:
> ...and for the short R45 installs too. The 40 and 50 ft Rohn setups 
> specify a single 1/4 in EHS cable. Heights of 60 ft and above use a 
> combination of 3/16 and 1/4 in EHS.  Sure is confusing!
>
> Mike
>
> On 6/9/23 21:36, Steve Maki wrote:
>> Destroying the bracket? What are you talking about? 1/4" EHS is 
>> SPECIFIED on tall R45's.
>>
>> -Steve K8LX
>>
>> On 2023-06-09 9:27 PM, Ron WV4P wrote:
>>> 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 at 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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