Larry:
I don't think you want to hook your tram line to the mast unless it's
a real small beam on a short tower. There is a LOT of tension on that
line. Hook it to a tower leg at the top of the tower. If the tower is
guyed, remove one guy (loosen the other 2 a bit) and let the tram line
(I used 3/16 EHS for a tram line) be a temp guy. When you get the ant
up there, hang it from the tower, relocate the tram, move the pully up
on the mast and then pull the ant UP. If you do tram on the mast,
consider a couple back guys on it.
I found it very handy to put a rotor shelf a couple feet above the
rotor. It will keep the mast relatively vertical when the rotor is
pulled. Also, a muffler clamp SECURELY fastened to the mast will
allow the mast to sit there while a) pulling rotor b) installing top
ant on mast before raising mast to full height, etc. If you want to
keep the mast from rotating, use a piece of angle stock to secure the
clamp to the rotor/accessory shelf.
Note that most thrust bearings are NOT designed to hold the vertical
weight of your antenna/mast. A good way to lose your toes.
Also, I feel it is better to get that rotor down further than 5' from
the top. Go to the bottom rung of the top section, 8' or so.
Greg
na8v/4
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
Search: http://www.contesting.com/km9p/search
|