[TowerTalk] Crank Up Tower Info

[David Jordan]

Depends on the design of the crank-up tower...

The Tri-EX CT-100 is a 100ft guyed crank-up tower. see 
http://www.qrz.com/db/WA3GIN for pics.

You have to identify the manufacturer of the tower to determine if the tower 
was designed to be guyed or to be free-standing.  Usually, its pretty easy 
to make the determination as a guyed crank-up will often have guy 
attachments loops welded to the top of each tower sections, as well as a 
tower load-lock-out that removes the vertical compression concern that Steve 
mentions from the lift cable.

Good Luck, Be Safe, and Have Fun,
dave
wa3gin


----- Original Message ----- 
From: "Steve Jones" <n6sj at earthlink.net>
To: "'Gary and Arlene Johnson'" <qltfnish at omniglobal.net>; 
<towertalk at contesting.com>
Sent: Thursday, March 07, 2013 2:59 PM
Subject: Re: [TowerTalk] Crank Up Tower Info


> You should not guy a crank-up tower.  The guys turn lateral wind pressure
> into a vertical compression force pushing straight down on the raising
> cable.  On a regular guyed tower, ie. Rohn 45, the whole tower structure 
> is
> designed to resist that downward force.  On a crank-up, only the raising
> cable is resisting that force.  There is certainly some design margin in 
> the
> raising cable strength that would let you get away with guys up to a point
> if you want to take the risk.
>
> 73,
>
> Steve
> N6SJ
>
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of 
> Gary
> and Arlene Johnson
> Sent: Thursday, March 07, 2013 11:39 AM
> To: towertalk at contesting.com
> Subject: [TowerTalk] Crank Up Tower Info
>
> I have an unknown brand of crank up tower that I need to put up. The tower
> can go up as high as approx 72 feet if all 4 sections are used.  I plan to
> only use the bottom 3 sections as did the guy I got it from.  The guy I 
> got
> it from had it guyed at the 20 foot and 38 foot levels (at the top of the
> bottom and middle 20 foot sections).  For a tower of this height how far
> from the base do I install my ground anchors??  Would I put them at an
> average of the distance between the two sets of guy lines (approx 29-30
> feet) or at the distance of the upper guy line (38 feet).  When he had the
> tower fully retracted he just let the upper guy lines go slack.  The
> alternative to this question is should I put in a set of ground anchors 
> for
> each set of guys??
>
> Gary J
> N5BAA
> Hill Country Amateur Radio Club Secretary 2013 Kerrville, TX
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