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Re: [TowerTalk] Rohn 45 tower and base

To: "Mike" <hinrgdj@centurylink.net>, "'Tommy Alderman'" <aldermant@windstream.net>, "'Tower and HF antenna construction topics.'" <towertalk@contesting.com>
Subject: Re: [TowerTalk] Rohn 45 tower and base
From: "Mark Robinson" <markrob@mindspring.com>
Date: Wed, 3 Nov 2010 22:37:29 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
I think that it will be fine. It is a guyed tower and the base is just to 
stop the tower sinking into the ground.


Mark N1UK


----- Original Message ----- 
From: "Mike" <hinrgdj@centurylink.net>
To: "'Tommy Alderman'" <aldermant@windstream.net>; "'Tower and HF antenna 
construction topics.'" <towertalk@contesting.com>
Sent: Wednesday, 03 November, 2010 10:05 PM
Subject: Re: [TowerTalk] Rohn 45 tower and base


> Thanks Tommy,
>
> The commercial "foundation" company crew brought a 30" auger, drilled the 
> 4'
> hole in less than 5 minutes, set a sonotube, dropped the spec'd rebar cage
> in, c/lined the pier pin and I OMG set the base plate over and discovered
> the fubar. Plan "B" is to now have them set a rectangular 36" square
> (inside) 2'X6" form on grade centered around the 30" existing hole...they
> will cut the 6" above grade sonotube down to grade level first and add
> appropriate wire mesh or rebar in that 36" square form. Crossing my 
> fingers
> and knocking on wood....
>
> 73, Mike
>
>  _____
>
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Tommy Alderman
> Sent: Wednesday, November 03, 2010 4:48 PM
> To: 'Tower and HF antenna construction topics.'
> Subject: Re: [TowerTalk] Rohn 45 tower and base
>
>
>
> No - you are exactly correct!
>
> I did not follow the Rohn instructions and used the CB2 foundation. My 
> pier
> pin base plate is offset as you say, but with the larger 36" x 36" CB2
> foundation, the base plate does not overhang. My tower is only 70' high, 
> but
> with a 90' 45G, I sure would phone Rohn and get confirmation that their
> Buyers Guide is correct, just for the peace of mind!
>
> Tom - W4BQF
>
>
>
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of MIKE
> Sent: Wednesday, November 03, 2010 2:33 PM
> To: towertalk@contesting.com
> Subject: [TowerTalk] Rohn 45 tower and base
>
> I am trying to get a 90ft 45G tower installed before winter sets in and 
> the
> required base in the mfg guide is a CB1, 30" round or square (more
> concrete). Found out the hard way that the steel base plate hangs off the
> 30"circular pier on two sides. Digging into an older Rohn catalog, I found
> in the fine print that I require a 36" circular pier! Aside from this all
> the drawings I've found specs the pier pin to be "centered" whether or not
> you use a round or square form.
> The 20"X24" concrete base plate pier pin hole is offset and the plate (and
> tower) will not be centered over the c/l of the foundation. Am I missing
> something here?
>
> Thanks, Mike K4EAR
> _______________________________________________
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