You can buy the MARC program from Champion Radio for $10 and it will
calculate this for you even suggesting the type of mast material. They will
email the
program to you. It would be $10 will spent.
I used a 1 1/2 inch 6061 with 1/4 wall and it seemed very "whippy" to me. It
is also not that light and is expensive. 24 feet cost me $250. 2" would be
even more expensive by a big margin. I had to use 1 1/2 because I mounted to
a chimney and that was as big as the brackets would handle. Unfortuantely
the MARC program does not calculate for 1 1/2 inch mast so I had to guess and I
underestimated.
To get rid of the whip, I strengthened it with a piece of 2" steel fence pipe
slipped (forced) over the outside for that part that was above the chimney
brackets. That stiffened it up quite a bit but added to the weight.
I believe it would have been better to have used a 2" mast of thinner wall
and stronger material to start with. 2 inch 6061 with a 1/4 inch wall is going
to be heavier than you think. I guess someone on here will do the math and
tell you the weight. I doubt if it will be much less than 98 pounds.
I am sure it will be stiffer than my 1 1/2 inch but 16 feet above the tower I
bet it turns into a tuning fork.
Radio k4ia
Craig"Buck"
Fredericksburg, Virginia USA
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