[TowerTalk] US Tubular tower

[Rick Karlquist]

I have an MA550 with 2 element Steppir 6 inches above the top of the
tower.  According to the UBC calcs that came with the tower, this is OK up
to winds of 50 or 60 MPH.  You should plan to crank it down in the event
of a severe storm that may reach 70 or 80 MPH.  FWIW, the MA550 had a KT34
on it during the '89 earthquake and stayed up, although it moved a lot.

Rick N6RK



Richard D. Markel wrote:
> I must use a tubular tower in my location.
>
> I plan on installing a 55 foot US MA 550 tower with motor pull-down
> drive.  I have tentatively decided on a Steppir two element beam (specs
> aren't too shabby for such a short boom) either bolted directly to the end
> of the top section of the tower or only 6 inches above the tower on the
> mast.  The mast itself would have a total length of 10 feet with about
> seven feet protruding above the tower.  At the top of the mast would be an
> Optibeam 40 meter rotatable dipole.  Total wind load would be about 7.5
> feet with a total weight (not including mast) of about 50 lbs.
>
> How does this sound?  Is the MA 550 up to it?  I think this is the best I
> can do at this location and still get a forty meter antenna up at
> acceptable height.
>
> Your thoughts would be appreciated.
>
> Tnx
>
> dick - KB6VT
>
>
> _______________________________________________
>
> See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless
> Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with
> any questions and ask for Sherman, W2FLA.
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
>