Towertalk
[Top] [All Lists]

[TowerTalk] Topsy Turvy

To: <towertalk@contesting.com>
Subject: [TowerTalk] Topsy Turvy
From: 00tlzivney@bsuvc.bsu.edu (00tlzivney@bsuvc.bsu.edu)
Date: Mon, 21 May 2001 12:43:31 -0500 (EST)
I have recently completed construction of a moderately large antenna -
48 foot boom with 5 elements for 20m and 2 heavily beefed up 402CD elements.
This weighs about 250 pounds.

The problem is that when I lift the boom with a sling, the antenna wants
to roll around the boom so the elements are vertical.  This has happened
several times, regardless of how I adjust the slings.  It is stable in
the horizontal position, but only a slight tilt in either direction around
the boom causes it to go vertical.  All seven elements are mounted on
the bottom of the boom.  There is a boom strut above the boom with
3/16 EHS guys and real galvanized turnbuckles.  I have measured that
each element is indeed centered on the boom.

I have never experienced this before.  In the past I have trammed the
antennas up so that the pull line would have kept the antenna with
the proper attitude so I may not have noticed this tendency.  This time,
I was trying to pull the antenna up the side of the tower in a vertical
pull and was going to pull the antenna away from the tower a moderate
amount where necessary to clear lower antennas and perhaps temporily
drop a guy (like I understand W9RE does).  But this tendency to\
go vertical means that I need over 44 feet of vertical clearance between
antennas to get this sucker on the tower!

Any ideas?

Terry Zivney, N4TZ/9

List Sponsor:  Champion Radio Products - We'll be at the Dayton Hamvention
with all of our safety equipment and other products. Stop by booth #559 and
say hi.
<A HREF="http://www.championradio.com";>www.ChampionRadio.com</A>

-----
FAQ on WWW:               http://www.contesting.com/FAQ/towertalk
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com


<Prev in Thread] Current Thread [Next in Thread>