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I am putting up a new M2 Rotor on a Rohn 25 tower to swing a Sommers
XP708 antenna. I am using the Rohn bearing plate on top of the standard
25G section. I intend on mounting the rotor at the bottom of the first
tower section down from the top. I plan on running a 2" OD mast from
the rotor through the bearing and approximately 10 feet above the XP708
which I intend on placing on right above the bearing. I will be placing
a Cushcraft AR270B at the very top of the mast above the beam.
Here is the question: I have been trying to decide what kind of
material I should use for the 2"OD mast. I have gotten prices for 4130
material 2"OD with a 1/8" wall thickness, and a carbon steel tubing 2"OD
with a 7/32" wall thickness. The 4130 will cost about $7.95 per foot
and the Carbon Steel will cost about $6.50 per foot.
What is the strongest and best type of material of the 2 possibilities?
Are these prices about right for these products?
Thank for the advise.
Paul
WA0BAG
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<TT>I am putting up a new M2 Rotor on a Rohn 25 tower to swing a Sommers
XP708 antenna. I am using the Rohn bearing plate on top of the standard
25G section. I intend on mounting the rotor at the bottom of the
first tower section down from the top. I plan on running a 2" OD
mast from the rotor through the bearing and approximately 10 feet above
the XP708 which I intend on placing on right above the bearing. I
will be placing a Cushcraft AR270B at the very top of the mast above the
beam.</TT><TT></TT>
<P><TT>Here is the question: I have been trying to decide what kind
of material I should use for the 2"OD mast. I have gotten prices
for 4130 material 2"OD with a 1/8" wall thickness, and a carbon steel tubing
2"OD with a 7/32" wall thickness. The 4130 will cost about $7.95
per foot and the Carbon Steel will cost about $6.50 per foot.</TT><TT></TT>
<P><TT>What is the strongest and best type of material of the 2
possibilities?
Are these prices about right for these products?</TT><TT></TT>
<P><TT>Thank for the advise.</TT><TT></TT>
<P><TT>Paul</TT>
<BR><TT>WA0BAG</TT></HTML>
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