[TowerTalk] Crank Up Tower Info

[Mike]

I have seen guyed crank up towers, I think they were Tri-ex. They looked to
have a flip lock attached to the guys so that the sections would lock in
place when the guys were pulled out.  The one I saw recently that needed to
be removed was locked forever with rust and would have been a bear to take
down without a crane. A good idea except when the locks rust in place.

Mike/K6BR

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Steve
Jones
Sent: Thursday, March 07, 2013 12:00 PM
To: 'Gary and Arlene Johnson'; towertalk at contesting.com
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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