When I was building my F12 240N (and C31XR), I did not use F12's boom
truss. IIRC, it was here that I found (probably in the archives) a link to the
SteppIR manual online, where it describes using 4 clamps on 1200 lb Phyillstran
for their boom truss. I did the same thing for both boom trusses. 4 clamps
per end and used blue locktite on the threads. I've never had any of the
clamps loosen up. YMMV. Tom, N2SR
From: Grant Saviers <grants2@pacbell.net>
To: Roger (K8RI) on TT <K8RI-on-TowerTalk@tm.net>; towertalk@contesting.com
Sent: Sunday, November 29, 2015 1:45 PM
Subject: Re: [TowerTalk] [Bulk] Re: [Bulk] How to "lock down" wire rope
clamps/clips?
Comments in-line
On 11/27/2015 17:54 PM, Roger (K8RI) on TT wrote:
> My thoughts:
>
> When I see the specs on clamping wire rope, phillystran and EHS, I
> have to wonder if they are talking about using one clamp, or three as
> is suggested for the Phillystran boom truss?
Here is what one antenna manufacturer has in the manuals: SteppIR has 4
clips each end of 1200 Philly on the Monstir boom truss and 4 clips on
each element truss end. My 4L steppir has no element truss and has 4
clips each end for the boom truss.
Here is a warning from the Monstir manual "Do NOT completely tighten the
wire clips until you have double checked that the lengths are correct,
because once the clips are fully tightened the jacket is deformed so
much it will expose the Kevlar to sunlight if the clip is moved"
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