[TowerTalk] Rohn 25g unguyed height

[Clay Autery]

Terry,

Rohn used to have a manual that included the precise answers to your 
question.  Max self-supporting heights, and it also specifically 
included the numbers for a tower bracketed (properly) to a structure.

Last time I looked, that manual was no longer live linked to the 
website, having been replaced with a MUCH less comprehensive (aka newer) 
manual.

IMHO, and I am NOT a PE...  I would NOT put ANY more 1- foot sections 
above the section bracketed to your house (how is it bracketed exactly, 
what is it tied to, et al) without proper guying supports with the 
antenna you describe....  I would make double danged sure I have SOMEONE 
willing to sign-off on the Rev. G requirements for your location, etc, 
etc. before attaching that tower to my house....  IF it falls on your 
house, you'll be glad you had someone, preferably a PE on the blame line 
so your insurance peeps will pay for the rebuild/damage.

My extremely conservative opinion is just that... my opinion. Others 
will differ.

Step 1)  Call Rohn and ask for the manual/specs/limits.

Clay,
KY5G


On 10/23/2017 11:20 PM, Terry Brown wrote:
> I am trying to determine how high I can use a Rohn is 25g unguyed.
>
> Here is my situation:
>
> I want to sink a 10 ft section of Rohn 25g into 3 ft of  concrete  base. This will leave 7 ft. Above the base. I will then attach another 10 ft. Section and attach a house bracket at the 14 ft level. This will leave the second section unguyed for 3 ft above the house bracket.  How many more 10 ft. sections can I add safely above that point?  My antenna will be a Mosely TA33-Jr (27 lbs) wind surface area 5.1 sq. Ft. Windload 98 lbs at 80 mph.
>
> Rotor is Alliance HD-73.
>
> Thanks!
>
> Terry