How come the extra weight of 55G when 45G or even 25G would suffice for that
small load. Ive been involved in several roof top installs at
commercial/industrial sites and roof loading weight was always the primary
concern.
Carl
KM1H
----- Original Message -----
From: "Christopher J Galbraith" <cgalbrai@umich.edu>
To: "'towertalk'" <towertalk@contesting.com>
Sent: Friday, August 17, 2007 3:14 PM
Subject: [TowerTalk] Our club's (W8UM) new tower and antennas
> Gang,
>
> For your enjoyment, here are some action shots of our new W8UM roof-top
> tower installation from 7/30/07. It is a 40 ft Rohn 55G tower on top of
> the
> 60 ft tall Electrical Engineering and Computer Science (EECS) building at
> The University of Michigan:
>
> http://www.umich.edu/~umarc/projects/towerConstruction.html
>
> And one view from the ground on Michigan's North Campus:
>
> http://www.umich.edu/~umarc/photos/tower/views/tower_Beal.jpg
>
> The new tower and antennas have evoked some positive responses from the
> engineering types in the vicinity ("it is huge!") and we hope it will
> serve
> as our most valuable visual recruiting tool (enticing students into the
> W8UM
> shack).
>
> The 4-el SteppIR at 105 ft is a DX killer on 20m (and should be on 14-30
> MHz
> when propagation improves) and the dipole seems to be doing well on 40m,
> too.
>
> We originally were going with a MonstIR for the HF Yagi but ran into a
> series of engineering problems. It is a long story, but our problems were
> mostly due to having structural engineers that did not have any experience
> with roof-top antenna installations. In the end, the 6-20m Yagi with
> 30/40m
> dipole was a good compromise between overall performance and
> size/weight/cost.
>
> I sincerely thank everyone on the list who gave us excellent advice
> throughout the design process. We learned a great deal in the year or so
> of
> putting the design together, and a lot of information came from list
> members' valuable experience. As you'll note on the web page, Hank
> Lonberg
> and Matt Strelow had a lot to do with our success, too!
>
> Support your college amateur radio clubs!
>
> 73, Chris KA8WFC
>
> The U-M Amateur Radio Club (W8UM)
> www.umich.edu/~umarc
>
> P.S. If you know any U-M alumni, please spread the word. We love to hear
> from former W8UM (and W8PGW, W8AXZ, even 8AX!) ops.
>
>
> _______________________________________________
>
>
>
> _______________________________________________
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> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
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