Thanks for the comments guys. The only thing about the US Tower is that it
is really expensive to have delivered (a ham in FL paid 900.00 to have one
shipped!!!) So it may actually cost me more. I would be willing to explore
the Force 12 low profile tower. The C3SS was another choice of mine. The
only thing about it is that I would have no upgrade path (C3S to C4S)
Anyways, what type of base would I need? I would only be able to attach the
tower to the house at the 10' or 15' level. I would go with the highest
tower (42' one)... would the C3SS be ok up there? :)
Thanks!
Jason
----- Original Message -----
From: "Pete Smith" <n4zr@contesting.com>
To: <towertalk@contesting.com>
Sent: Sunday, October 13, 2002 9:34 AM
Subject: Re: [Towertalk] An idea...oh boy
> At 05:37 AM 10/13/02 -0500, Kelly Taylor wrote:
> >...
> >I hesitate to disparage your idea, but it appears you may be making
> >assumptions about windloading and the transfer of forces that may not be
> >quite accurate. Five square feet at the top of a 30-foot mast will
transmit
> >one heck of a lot more force to the tower than five square feet at the
top
> >of the tower. Add the five square feet you estimate for the mast and I
would
> >guess you would exceed the ability of the Rohn in very short order.
>
> I think Kelly's got a pretty good point. I have a ~3 square foot short 40m
> yagi 9 feet above a 25AG2 top section, on 2" mast with a .250" wall. The
> amount that mast twists and wiggles in the wind is "impressive" (read
> scarey). All of that torque and/or overturning force would be transmitted
> through the few small welds at the top of a tower section that is really
> not designed for that sort of thing.
>
> Rather than the Hexbeam or the A3S, to go with your crankup I'd suggest
you
> look at the Force 12 C3-SS. It's a little bigger than the Hexbeam and
> significantly smaller than the A-3S, and will outperform either one, with
> only 4.4 square feet of wind area. If you can deal with the extra cost,
> you might also look at the Force 12 low profile tower that nests to 12
feet
> and extends to 42. It costs about $1400 plus freight but is a clean
design
> that is likely to grab hold of neighbors' and your XYL's eyeballs less
than
> the crankup. See www.force12inc.com for details.
>
> Please note I have no connection with F12 other than as a happy customer
> and volunteer manager of the F12 web site, force12talk@qth/com.
>
>
> 73, Pete N4ZR
> Sometimes a tower is just a tower
>
>
>
>
> _______________________________________________
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> See http://www.mscomputer.com
>
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