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
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