[TowerTalk] Which type of cable for a crank-up tower?

[John Lemay]

Chaps

I have lost the original message, in which someone asked about either 6/19
or 7/19 cable.

I can confirm it is available here in the UK (but not necessarily of UK
origin). 6/19 and 7/19 are types of cable, not sizes, and refers (in the
first case) to 6 wires of 19 strands, on a fibre core. In the case of 7/19
the fibre core is replaced by a further wire of 19 strands.

Both are available in various diameters from 3 to 8mm.

John G4ZTR

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of K7LXC at aol.com
Sent: 02 December 2011 17:05
To: ve6wz at shaw.ca; towertalk at contesting.com
Subject: Re: [TowerTalk] Which type of cable for a crank-up tower?



 
>  What is a "Fixed flaw" ????

 
    In this case, it's a flaw that's at a fixed  location on the cable. In 
the case of a crank-up, the flaw would move around due  to cable travel. 
With a "set", part of the cable is flexible and part of it  isn't. It
doesn't 
take took much to realize that any non-flexing portion  of a moving cable 
will reduce the reliability of the cable. 

>  I really do not mean to be difficult Steve, but exactly what  is the 
science 
behind this??
 
    You have to have science to tell you that the cable  is damaged? 

>  Do you have a reference?
 
    You mean other than my 20 years of ham radio tower  work on over 225 
stations, being a US Tower factory authorized installer,  spending time at
the 
UST factory to learn how to work on their towers,  installing and 
maintaining dozens of crank-up towers? No, I don't.

>  In my documentation, US tower has no reference about not  stopping the 
tower 
in the same place.
 
    They leave out just about any useful information  due to liability 
exposure. Tower manufacturers are insurance driven enterprises  and are not 
interested in giving out any information that they don't have to.  This way
if 
something happens to your tower, they can say that they didn't tell  the
user 
to do it so it's not their problem. 

>  Are cables not meant to bend? It seems to me the cable is  permanently 
"set" on the drum when its down and I don't see this as a  problem.
 
    A "set" is a deformation of the cable. It's a flaw  and is potentially 
fatal to the installation. 
 
Cheers,
Steve     K7LXC
TOWER TECH 
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