Usually I tie a rope or cable to the boom, and attach it to a pulley on the
mast or higher point on the tower and then bring it back down to a
come-a-long. I then remove the mounting u-bolts and tilt and turn the
antenna to reach the elements on the tower. I have single handedly adjusted
and repaired many antennas this way including a full sized 40m and a 60'
boom 20m beam. When you are done with your repair, pull the boom back into
position and replace the u-bolts.
73,
John
To: towertalk@contesting.com
Subject: [TowerTalk] U-bolt swivel?
From: "Kelly Johnson"
Date: Mon, 11 Jun 2007 10:50:53 -0700
I have a 2 element 40m yagi about 8 feet above the thrust bearing of
my crankup tower. Working on the elements or feed is a real problem
because they are 8 feet away from the mast. Right now, the only 2
solutions are:
1) An aerial lift, bucket truck, cherry picker, etc.
2) Tram the antenna down from the tower after tramming down the SteppIR
mounted at the thrust bearing. This is quite a bit of work and
requires
climbing the mast which doesn't thrill me a whole lot.
It would sure be nice to be able to swivel the yagi at the U-bolt to
allow either element to be brought near the tower/mast for
maintenance. I've seen swivel attachments but the ones I saw didn't
look too substantial and they have very limited range. In other
words, they wouldn't be able to get the element close enough to the
tower to avoid #1 or #2 above.
Any other bright ideas out there?
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