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@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of K7LXC@aol.com
Sent: 02 December 2011 17:05
To: ve6wz@shaw.ca; towertalk@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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