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Re: [TowerTalk] N00b Tower Question

Subject: Re: [TowerTalk] N00b Tower Question
Date: Tue, 26 Jun 2007 12:09:28 EDT
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In a message dated 6/25/2007 5:56:57 P.M. Pacific Daylight Time, writes:

>  I want to install this tower, and I want to do it  properly.  I've spent 
just getting it on-site, and I'm willing  to spend more to install it as it 
should be installed.  To this end,  I've assembled some bits and pieces 
the project, but I'm just not  clear how to best proceed.  I really want to 
the work myself if  possible, not out of penny-pinching as much as I'd like 
have the sense  of accomplishment.

>  What I have so far:

>  A  Tri-Ex 71' HZN-471 Crank Up Tower (pictures on the link  below)

>   _http:// 

>   A Cushcraft A4S with the A744 add-on for 40m

>  No rotor/thrust  bearing/whatever yet

>  There are a dozen sites that lovingly  detail the installation of a tower, 
while they are all similar they  are all different, too.  My tower, as you 
see from the pictures,  is older (40 yrs?) and is thus no longer supported by 
engineering drawings  or anything per Karl at Tashtowers, the successor 
to Tri-Ex.   The closest thing seems to be the LM-470, but the 
detail in the  engineering drawings for the base isn't really clear to me.

    You mean he won't give you any help with the  base? What's ambiguous 
about the drawings? 

>  The guys on eHam  said the tower seemed sound in the pictures, but that 
about the extent  of what they were able to say.  I believe they were all in  
California, so an on-site inspection was out of the question.

I didn't see anything alarming from the photos.  Everything looked like it 
was in decent shape.

>  Is there a site I've missed that has good newbie tower  base information?  
only time I ever did concrete was putting up  12' satellite dishes...this is 
quantum leap, and I'm very aware that  once I've poured 4 yds of concrete, 
it's forever.
    This is an engineering question. Either talk to  Karl about specifics or 
have an engineer run the calcs and design the base and  anchors. 
    You can make some inferences from similar US  Tower models but none of 
theirs use guys so it'd be apples and oranges.  

>  I'd be particularly interested in the experiences of anyone  who has put 
up a 
similar tower, but I would be grateful for any advice,  links, expressions of 
pity, and especially any input that gets me closer  to seeing this beast 
vertical instead of lying on the ground.

Are you going to get a building permit? If so,  you'll probably need the PE 
drawings for the application package. If not, you  still need some engineering 
help. Maybe there's someone in your local ham club  that's an engineer and can 
help. There are several steps to follow after this;  e.g. rebar cage, 
excavation, concrete pour, getting tower to the base, etc.  

Steve     K7LXC
Professional tower services for hams
Cell: 206-890-4188

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