[TowerTalk] new tower

[David Robbins K1TTT]

Personally I would want to see the video of the steel base on the concrete
with the thousands of pounds of pressure from the tower and guys on it
grating past each other before I would believe that it was for relieving
stress from torque.

David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
 

> -----Original Message-----
> From: towertalk-bounces at contesting.com [mailto:towertalk-
> bounces at contesting.com] On Behalf Of john at kk9a.com
> Sent: Sunday, July 15, 2007 02:39
> To: jeremy-ca; TOWERTALK at contesting.com
> Subject: Re: [TowerTalk] new tower
> 
> I guess you are saying that the base will rotate before the tower breaks.
> I
> don't think that much torque makes it to the base on a tall tower.
> Certainly the pier pin base will not prevent your tower from moving at the
> top.  I never saw any movement at the base of my 160' Rohn 65G tower
> loaded
> with large antennas, however the tower definitely twisted at the top
> before
> I added a 6 way star guy.
> 
> KK9A
> 
> 
> ----- Original Message -----
> From: "jeremy-ca" <km1h at jeremy.mv.com>
> To: <john at kk9a.com>; <TOWERTALK at contesting.com>
> Sent: Saturday, July 14, 2007 10:33 AM
> Subject: Re: [TowerTalk] new tower
> 
> 
> The tower will still move but it is not twisting as in winding up to a
> point
> of possible fracture. The commercial site over on the next hill had 140'
> of
> 45G with the base buried in concrete and a bunch of sticks on it. After
> about 15 years the bottom section fractured. The tower didnt collapse but
> they replaced it with 55G on the same pad but drilled it for a pin.
> 
> We are both in a very exposed location with negative horizons and once
> above
> the tree line the wind is almost always fairly strong even when it is dead
> calm on the ground.
> 
> Carl
> KM1H
> 
> 
> ----- Original Message -----
> From: <john at kk9a.com>
> To: <TOWERTALK at contesting.com>
> Cc: <km1h at jeremy.mv.com>
> Sent: Friday, July 13, 2007 10:57 PM
> Subject: Re: [TowerTalk] new tower
> 
> 
> >I agree that the pier pin lets the guys do the work and it is the best
> base
> > for large tower.  I don't think the pier pin base will do anything to
> > minimize tower twisting.  The best way to stop the twisting is to use a
> > star
> > guy bracket.
> >
> > John KK9A
> >
> >
> >
> > To: "Mark Robinson" <markrob at mindspring.com>,"Paul Hemby"
> > <phemby at hotmail.com>, <towertalk at contesting.com>
> > Subject: Re: [TowerTalk] new tower
> > From: "jeremy-ca" <km1h at jeremy.mv.com>
> > Date: Fri, 13 Jul 2007 21:34:21 -0400
> > List-post: <mailto:towertalk at contesting.com>
> >
> > It minimizes the tower twisting forces especially at the base.
> Recommended
> > by Rohn. Especially advantageous with a tall tower with a big load; lets
> > the
> > guys do the work. Ive been on the top of my tower with a strong wind
> > blowing
> > and with the 1/4" EHS it barely moves.
> >
> > Carl
> > KM1H
> >
> >
> 
> _______________________________________________
> 
> 
> 
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