I'll second the motion that the DX Eng saddle clamps are the way to go.
Lots of surface area of the saddle in contact with the mast and
stainless u-bolts are provided. Use a SS nylock nut backing up the
(provided) regular heavy hex nut. The only downside is they are only
made in tube sizes, no pipe (IPS) sizes, when last I bought them. Your
mast to boom plate needs to be thick enough to handle the stress, I use
1/2" thick 6061 T651 x 8" wide x 20" long and that has enough room for
four saddle clamps for a 2.5" boom to three saddle clamps for a 2" or 3"
mast.
Grant KZ1W
On 7/22/2012 7:00 PM, Gregg Seidl wrote:
> I just got down from my tower after turning my XM-240 in line to match the
> rotor and other antenna AGAIN.
> I have done this several times now and I just can't get a grip on why this
> continues to happen. I haven't had trouble with any other of my antennas,some
> have more windload than the XM-240.
> As I was up there enjoying the view and thinking why this one turns I had an
> idea and wanted to ask others ideas.
> First it is up 85 feet and has been up for 6 years and I think it works
> great. It is much more stout than the 40-2CD that I had up before but came
> down piece by piece in a bad windstorm.
> I am using the stock clamp which seems to be great,the only thing that I
> haven't used one other antennas but did on this one was a galvanized mast
> from Texas Towers. Could it be that the mast is too "smooth" to grip? The
> U-bolts are not loose when I go up to straighten the antenna. It only happens
> once a year or so nd always after a 70-80 MPH windstorm which we get here
> sometimes.
> Looking for ideas.
> Gregg K9KL
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