I believe it ws on the array solutions web site, they had some extremely
heavy-duty crank-up towers listed. I think they were the "ITS Telescoping Crank
Up Towers", and the ad said that guying them was okay. The guy points shown in
one of the pictures that used to be on the site appeared to be very stout.
But recently, their link to the ITS towers seems to have gone away. Likewise,
they don't sell the "Big Bertha" rotating towers any more. I'm guessing that
they don't want to be in the tower business any more, just stuff for smaller
antennas.
LJ
-----Original Message-----
>From: Larry stowell <lclarks@nc.rr.com>
>Sent: Feb 27, 2007 3:22 AM
>To: towertalk@contesting.com
>Subject: Re: [TowerTalk] Crank up / guy wires..
>
>
>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
>
>-----Original Message-----
>From: towertalk-bounces@contesting.com
>[mailto:towertalk-bounces@contesting.com] On Behalf Of Jim
>Lux
>Sent: Monday, February 26, 2007 8:56 PM
>To: richard@karlquist.com; kdurand@protologiceds.com
>Cc: towertalk@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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