[TowerTalk] HDBX-48

TexasRF--- via TowerTalk towertalk at contesting.com
Sat Jan 31 19:26:49 EST 2015


Hi Roger, yes, the galvanized pipe will bend a lot easier than solid rod.  
But, one would only allow six inches or so of the material to show above the 
 concrete surface. That keeps the bending moment low enough to prevent a  
problem.
 
The original BX hinged base used a short piece of galvanized pipe as the  
interface between the tower leg and the anchor bolt. Apparently Rohn 
engineers  thought it was adequate.
 
I mentioned the method as it has been used before and galvanized pipe is  
available everywhere. Solid rod is surely stronger but a lot more expensive, 
not  as readily available and needs some way to prevent rust.
 
73,
Gerald K5GW
 
 
 
 
In a message dated 1/31/2015 5:25:46 P.M. Central Standard Time,  
K8RI-on-TowerTalk at tm.net writes:

On  1/31/2015 6:12 PM, TexasRF--- via TowerTalk wrote:

If I make my own, I  use solid rod. Galvanized pipe is soft, bends 
easily.  Solid rods are  as easy to work with.

73

Roger (K8RI)


> Hi Tom,  these towers are made by Thomas Shelby Co in Ohio now and you 
find
>  them with a Google search.
>   
> Some users have made  their own base stubs by purchasing a 10ft length of
> galvanized pipe  and cutting into three pieces. The size that is just less
> than   2" OD will work just fine. Then you will need to drill two holes 
in  each
> pipe  piece to match the bottom section mounting. Six bolts  can then be 
used
> to fasten  the pipes to the tower  legs.
>   
> If you are concerned about water collecting  in the pipes and subsequently
> freezing/splitting you can place six  inches or so of crushed rocks in the
> bottom  of the foundation  hole to allow drainage. Or you could fill the 
pipes
> with   concrete but that is a messy job.
>   
> 73,
>  Gerald K5GW
>   
>   
>    
>   
>   
>    
>   
>   
> In a message dated  1/31/2015 3:00:24 P.M. Central Standard Time,
> k5iid at sbcglobal.net  writes:
>
> I have  purchased a used Rohn HDBX-48 to be  installed at my new QTH. What
> do I need in  the way of Mounting  materials (mounting stubs,etc) and more
> importantly, where  can I  get them.
>
> Does anyone know who actually stocks them. Can they  be  manufactured by 
an
> individual? I can't even find a picture of  what one should  look like.
> Thanks in advance...
> Tom  K5IID
>
>
> Finally there is a  bit of joy in  Mudville!
> http://www.dfwcontest.com
>
>
> K5IID  Tom  Horton  Hillsboro, TX
> E sorter for ARRL W5  bureau
> Same call for  57  years!
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--  

73

Roger (K8RI)


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