In a message dated 1/21/04 7:33:43 AM Pacific Standard Time,
> I have a 15 foot piece of 1/4" thick aluminum mast. I am considering using
> this to come out of 50 feet of Rohn 45. I plan to put the Mosely CA-53
> on it along with an 11 element 2 meter beam.
Sure - as long as the HF beam is right at the top of the tower. You can
put the 2M antenna up the mast anywhere you want.
> What is the group's experience/thinking about using aluminum mast?
It's good for *some* mast applications. The problem is that 6061-T6
aluminum only has 35,000 pounds of yield strength - good for light mast loading
but not much else.
A 6 sq.ft. antenna 10 feet up a mast can exert 50-60,000 pounds of
bending moment depending on windspeed/pressure so aluminum is pretty wimpy for
kind of application.
I've got a mast calculator program available if you want to play some
mast/antenna loading scenarios. The MARC (Mast, Antenna & Rotator Calculator)
Program is available from <A HREF="http://www.championradio.com">
www.championradio.com</A> for ten bucks.
Champion Radio Products
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.
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