Hey Marv,
It's probably best if the arm hoops line up vertically so your coax goes down
as straight as possible. I'd extend them as far away from the tower as
possible rather than close to it. I'll let others chime in on your sleeve
questions.
Chris
On Nov 23, 2012, at 11:23 , Marvin Shelton wrote:
I'm in the process of rebuilding an older 72' crankup US Tower. I am almost to
the point of tilting it up but have a couple of things left to do first.
1. I order coax stand-off arms but the tower I have does not have pre-drilled
holes to mount them to. I can drill the holes myself but was wondering if I
should place the standoffs so that they extend from the tower as much as
possible, of the other way around. Obviously I'll be using the longest standoff
at the top and working my way down to the smaller ones. Of should I just center
the standoff arm in the tower channel of each section and let the various
lengths determine the distance from the tower?
2. my top section is flat and has a sleeve for a 2" OD mast (which I'll be
getting soon). Should I lubricate this sleeve when I put the mast thru it? and
if so, with what (noalox?)
3. Finally I need to drill holes in the top plate for the thrust bearing but
I'm going to wait until I get the mast to be sure that everything is centered
properly when I do. Any hints on how to center the thrust bearing?
Thanks
de Marv WA2BFW/7
73's from Marv
wa2bfw@att.net
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