Date: Thu, 29 Aug 2019 15:18:59 -0400
From: "john@kk9a.com" <john@kk9a.com>
To: Doug Ronald <doug@dougronald.com>
Cc: Mal Speer <malco@carolina.rr.com>, towertalk@contesting.com
Subject: Re: [TowerTalk] High VSWR
<That is a bad and sad accident but again lucky no one was injured by a
<falling object or a cable snapping back. Wow, that is a tough environment.
<Take a breather and I am sure you'll move forward again. The tower and
<rotator should be able to handle anything that you will likely put up plus
<it looks like it is an RF quiet location.
<73,
<John
## This could have all been alleviated by the use of a single $3.00
nicropress crimp.
The cable will break before the crimp lets go. I would use TWO
nicropress crimps
for this application.
## with 14,300 lb tension on the lift cable, the .5 inch cable is
too small. Typ you
use the cable with no more than 20% of its ratings. .75 inch would be
operating at 24%...
and the bare min size for this application. .75 inch winch cable is
readily available.
## Looks like a single U bolt used on each ele half..... hard to tell
by the pix. For the
long eles, it needs a min of 2 per half... and preferably 3-4 per
side.
## with more boom on the shorter ele side.....vs the longer ele side,
the required rotor
torque will be sky high. They have mounted the boom at its CG.
They should have
mounted at center of boom, and added a counterweight at light end of
boom.
Jim VE7RF
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