[TowerTalk] US Towers TX-455 questions

[Gene Smar]

Kelly:

     You are correct that constructing a self-supporting tower close to a
home's foundation is cause for concern.  The forces impressed upon the
antenna find their way to the foundation and to the surrounding earth that
opposes such focres.  These forces could cause block foundation walls,
especially, to crack.

     The rule of thumb that I've been taught for such foundations is to keep
the closest edge of the tower foundation at least the tower foundation depth
away from the house foundation.  That is, if your excavation is five feet
deep, then you shouldn't dig less than five feet from the house.  This
implies that the uplift forces on the foundation will be acting upon the
surrounding earth through a forty-five degree angle from the bottom of the
tower foundation.

     This design principle does not apply to towers that are bracketed to
homes.  That requires a different analysis of the forces as they are
transmitted to the home's walss and frame members.

     Good luck.

73 de
Gene Smar  AD3F

----- Original Message ----- 
From: "Kelly Jones" <kelly at dxcentral.com>
To: <towertalk at contesting.com>
Sent: Tuesday, October 19, 2004 1:03 PM
Subject: [TowerTalk] US Towers TX-455 questions


> Hello to the list,
>
> I am contemplating putting up a US Towers TX-455 and wondered if there are
> any suggestions for minimum distance from the foundation of the house to
> the tower base.
>
> My concern is that wind stress might be propagated down the tower to the
> base then to the house foundation.  The last thing I need is water pouring
> into the basement due to a cracked foundation.
>
> On another note, I'm trying to decide whether or not to stack a 2 element
> 40 with a F12 XR-5 on this tower.  Suggestions?  Advice? Good idea?  Bad
> idea?  Don't even think about it?
>
> Thanks,
> Kelly - N0VD
>
> _______________________________________________
>
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Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
>
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