[TowerTalk] Update on 40' non-guyed tower question

[Roger (K8RI) on TT]

I built a bracket using 1/2" square steel tubing welded into a channel 
with flat plates o the ends to take saddle clamps for the tower legs.
It's the last photo on http://www.rogerhalstead.com/ham_files/Dirt_Base.htm
That rower had two legs against the end of the roof so it tilted down at 
an angle to clear a tree.
The bracket is at an angle to match the pitch of the roof.  The end 
plate for the roof was a 2 X 6. I added a short  2 X 6 to lag bolt the 
bracket to.

73

Roger  (K8RI)



On 5/5/2016 Thursday 12:08 PM, Rob Matherly wrote:
> A couple weeks ago I asked about self-supporting a 40' Rohn 25 tower.
> After input from the list and a no-vote from the Missus on guy wires strung
> across the yard, I've gone back to my original plan to house bracket it.  I
> have a two-story with 10' ceilings, so there's plenty of house to hold it
> up.  (There is some concern regarding my metal roof, but less than I'd have
> to deal with if I were to anchor a guy wire in a flower bed.)
>
> Question #1 - I've read at various sources that I can go 16' above the
> bracket.  Is this correct?  Assuming my rough estimations of the house
> height are correct, my top bracket will be at about 30'.  I will also have
> a bracket in the 15' area.  I should be safe with about 45' of total height
> including my mast f I understand the Rohn data correctly.  Let me know if
> this is incorrect, please!  I will also be sistering the studs to help
> spread the weight out a bit.
>
> Question #2 - I'm going to homebrew the house brackets since I have the
> equipment and know-how to build it correctly (and not some hobbled-together
> mess of metal.)  Does anyone here have dimensions and specs on the
> materials used?  I believe the angled pieces are 2x2x3/16 galvanized, but I
> am not 100% on that.  I do not have any information on the thickness of the
> flat steel.
>
> Question #3 - It is my understanding that, since it is bracketed to the
> house, the concrete base does not need to be as large - 2x2x3 as opposed to
> 3x3x3.  Is this correct?  I don't want ground heave to damage my house.
>
> Thanks again, folks!
>
> Rob, w0jrm
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-- 

73

Roger (K8RI)


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