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 b
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 w
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 i
Destroying the bracket? What are you talking about? 1/4" EHS is SPECIFIED on tall R45's. -Steve K8LX Likely not an issue with your short tower but worth a call to Rohn. Ron, WV4P That's idiotic, or a
...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 -S
$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 Roh
You would be better off with one of these: https://www.3starinc.com/images/super/ROHN_TA656_800x600t.jpg Jim W7RY On 6/10/2023 11:30 AM, john@kk9a.com wrote: $325 each, Rohn is very proud of their to
Mike WB2FKO wrote >> QTH is north Florida so I want to make the setup as storm-proof as practical. Any insight appreciated.<< Virtually all of Florida is in a Special Wind Region (Hurricane Zone). Th
It's often an efficiency of materials equation. Why use more steel than necessary for a given loading requirement. -Steve K8LX Mike -Steve K8LX Likely not an issue with your short tower but worth a c
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 s
Yup I would use the shackle Steve KG5VK -- Steve *KG5VK* *Steven Lott Smith* Tele 318-470-9806 ARRL NTX Section Manager *Please note: My Out Going Email address is LottsPhoto@Gmail.com* *KG5VK@ARRL.O
The 3/8 shackle that Rohn recommends for the torque bar has a Ø3/8 bow, this does not meet the minimum pin diameter for either the 3/16 or 1/4 preform. I have never had a heavy-duty thimble crush fro
At the suggestion of WV4P, I spoke with a Rohn engineer about the incompatibility of their TB45B torque bars and 1/4 in EHS cable. See here: https://www.3starinc.com/manuals/ROHN_Torque_Bar.pdf All R
This does not appear to be a big issue. There are 3/8 shackles (the size recommended for your torque bar) that have a higher breaking strength than your 1/4 EHS. Did you measure the hole size to see
John: My calipers shows 0.55 inch diameter for the hole in the torque bar, so it looks like the bigger shackle will fit. It sure doesn't inspire me that Rohn can't provide an explanation for why they