[TowerTalk] re dumb question

[kk9a at arrl.net]

11' above the thrust bearing can put a lot of stress on the mast, especially
with 150#'s of antennas.  I'm not a ME, but I don't think that the 1 1/4
insert helps much.  Hopefully it works out for you. I believe all of the
Yaesu rotors except the G-2800 will clamp a 1 1/2 - 2 1/2" mast.  If you
have the latter, maybe you can machine the clamp so it closes more.

John


----- Original Message -----
From: "kce" <kce at chartermi.net>
To: <towertalk at contesting.com>
Sent: Friday, April 11, 2003 21:46
Subject: [TowerTalk] re dumb question


Thanks guys for all the suggestions, I liked the shim idea short of that I
was going to add material via a welder. Several suggested changing the mast
and I know I was not totally clear as to what I am using. I am using a 1.75
in sch 80 pipe with a insert of 1.25 inches of some tempered stuff a fellow
at the local air base gave me. Not sure exactly what it is but he said the
military was using a similar type of mast to support large log antennas.
anyway I am only extending 11 feet above the thrust bearing and the antenna
I am worried about is on the bottom of the stack just above the bearing
plate.. The one thing I did make sure of was that the mast through the
thrust bearing is centered with the rotator.
73 ken w8ob


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