In a message dated 7/19/2007 9:01:59 A.M. Pacific Daylight Time,
towertalk-request@contesting.com writes:
> Howdy all,
I am preparing to set up a satellite station with
M2 2MCP22 and 436CP42UG antenna's.
The wind loads are...
> 2MCP22 2.5 sq. ft.
436CP42UG 2.0 sq. ft.
> I have a Glen Martin RT-424 (with thrust bearing), 4.5' tall roof tower
that is rated
for 6 sq. ft. of load at 87mph.
> I will be mounting it on my deck as opposed to the roof. (My climbing days
are over:-)
My deck is approximately 12' off the ground on 6x6 posts and VERY sturdy.
> I will be using a Yaesu G-5500 rotor in a split configuration with
the AZ rotor inside the tower and the EL rotor at the top of the mast.
I also will be using a 8' fiberglass cross boom to mount the antenna's on.
> Now that all of the prerequisite specifications are listed, here is my
question....
> What should I use for a mast? It will have to be fairly long (15-20')
since
the
turning radius for the antenna's are around 10' and I am worried about
it being so long that it will bend or provide a fulcrum to damage the tower.
> I live in a 75mph wind zone.
I'd suggest a 2" OD piece of steel tubing. Your load isn't too big and
your windspeed rating is moderate so you probably don't need anything special.
Yes, you'll have a pretty good lever arm on the tower so be sure to
over-engineer everything.
Cheers,
Steve K7LXC
TOWER TECH -
Professional tower services for hams
Cell: 206-890-4188
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