[TowerTalk] Crank up / guy wires..
lclarks at nc.rr.com
Tue Feb 27 06:22:11 EST 2007
Aluma Towers in Fl has "guy ears" at the top of each section and mechanical stops to take the
tension off the cable. I have a HD75 and have never use the guying, A lot of there towers are sold
to the cell industry on trailers for cell site evaluations so I guess that might be where the guys
might be used.
73 Larry K1ZW
From: towertalk-bounces at contesting.com [mailto:towertalk-bounces at contesting.com] On Behalf Of Jim
Sent: Monday, February 26, 2007 8:56 PM
To: richard at karlquist.com; kdurand at protologiceds.com
Cc: towertalk at contesting.com
Subject: Re: [TowerTalk] Crank up / guy wires..
At 04:14 PM 2/26/2007, Rick Karlquist wrote:
>Guyed crank ups used to be available until the 1970's.
>The advantage of guying is that the base is much smaller and the tower
>can be a lot lighter for the the same windload. To really take
>advantage of guying, some towers had locks that took the stress off the
>raising cable after the tower was cranked up. It is not entirely clear
>why they stopped making them, but the unpopularity of guys due to
>XYL/neighbor complaints was probably a factor.
The engineering of a guyed crankup is also a bit complex, especially if the guys attach on the
extending part. There's that whole bending vs compression loads thing. It's possible that with newer
standards, it's not cost effective to make one strong enough, or that the complexity and strength of
the locks raises issues, in a "residential" kind of application.
They still do exist: I have seen recently manufactured guyed crankups in a tower trailer
configuration, but it's a pretty big structure (45m tall when erected) with hydraulic assists, etc.,
and can hold a fairly good sized antenna up on top. Way out of most ham budgets.
(google for "MOSS tower radar" or "Moghaddam tower radar")
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