Not sure what is cheaper than schedule 40 aluminum! In my installation I
have a 120' rotating mast alongside of one of my 160' towers that has 3 -15
meter antennas and 2-10 meter antennas on it that rotates from about 90 deg
to about 315 degrees and I used 2-1/2" schedule 40 aluminum pipe on it. I
coupled each section with a clamp that was a short section of steel pipe
that had approximately the same i.d. as the o.d. of the aluminum pipe. The
steel coupling was split along the center line and had ears welded on both
side with 4 -3/8" bolts bolting a joint together. It has been up for
almost 15 years with good results and not much torsional twist.
> -----Original Message-----
> From: firstname.lastname@example.org
> [mailto:email@example.com]On Behalf Of Sylvan Katz
> Sent: Thursday, April 19, 2001 7:53 PM
> To: firstname.lastname@example.org
> Subject: [TowerTalk] Lower Mast Question
> I am putting a Force 12 C31XR and EF240s on my 60' tower with a 6'
> separation between (the 40m yagi will be rotated 90 deg with
> respect to the
> tribander). I want to mount the T2X rotator as far down the tower as
> possible - in fact the nearer the base the better. I have 20' of 2" OD
> schedule 40 aluminum tubing for the top section of the mast. I
> presume that
> since the lower section(s) will essentially only have a torsional stress
> that I can use less expensive tubing than schedule 40 aluminum.
> Any recommendations for the lower section of the mast and what technique I
> should use to couple the sections together?
> .. sylvan
> Sylvan Katz
> VE5ZX & G0TZX
> Saskatoon, SK
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