[TowerTalk] Rotating tower guying question

[john at kk9a.com]

I agree that just because it survived XX years does not mean Phillystran
is as good as EHS however I feel that it is more than adequate for a
properly loaded tower. Are there any documented tower failures due to
non-conductive guy wire? I use tapered pier pin bases on my Rohn 65 and 55
towers so a little stretch is not a concern.

John KK9A


To:	<towertalk at contesting.com>
Subject:	Re: [TowerTalk] Rotating tower guying question
From:	"StellarCAT" <rxdesign at ssvecnet.com>
Date:	Mon, 4 May 2015 12:57:48 -0400

R65 is VERY heavy duty stuff ... coupled with 11200# philly I’d suspect
that it
would indeed feel very strong! My point was only IF K7NV’s analysis is
correct
and I’m surely not in a position to dispute it – and IF one has their bottom
section in concrete (and important consideration for the analysis) .... then
the conclusion would be that EHS is stronger than the equivalent philly. As
simple as that. So if a tower has survived with the philly that would only
suggest that it would have had more margin if it had been EHS. The fact
that a
tower has survived thus doesn’t prove that philly is as good – it only proves
that it is good enough for what THAT tower has seen since installation. Which
I’m sure is indeed ‘good enough’ .... but it doesn’t imply it is equivalent!

At least that is how I’d interpret his analysis.

as for life expectancy – if salt air is an issue I can see how this might
affect the decision – but for most it isn’t a concern. There are just as many
if not many more anecdotal stories of both ham and commercial towers with
steel
that have been up for 40 or more years and still doing fine.

Gary


Subject:	Re: [TowerTalk] Rotating tower guying question
From:	"john at kk9a.com" <john at kk9a.com>
Date:	Mon, May 4, 2015 9:40 am
To:	towertalk at contesting.com

I have a 150' Rohn 65G tower guyed with 11,200 pound Phillystran and I
have no concerns about guy stretching.  The tower feels solid and it has
been up for years at two different QTH's with no issues.

I used Phillystran at my Aruba station.  Steel guy cables and grips needed
replacement every four years and the Phillystran was still in excellent
shape when I dismantled the station.

John KK9A