I do not see how the center could migrate unless the cable got crushed. I
thought that the reason for storing it vertically was because the spool is
not strong laying on the side and it could break and crush the cable. It
is also easier to move around and unroll using reel jacks when vertical
John KK9A
To: "towertalk@contesting.com" <towertalk@contesting.com>
Subject: [TowerTalk] Inner conductor migration in Heliax(TM)
From: David Aslin G3WGN <david@aslinvc.com>
Date: Tue, 12 Apr 2016 18:33:58 +0000
Hi all,
Looking for the TT brains trust to help me out with this issue:
I have two drums of LDF4-50 and one of LDF5-50 which have been stored on
their
sides for around 10 years. This disobeys one of the prime directives, since
Andrew/Commscope say they MUST be stored with the drums vertical. My
understanding is that the horizontal storage may lead to inner conductor
migration.
QUESTIONS: How can I determine whether migration has occurred; if so to what
extent; and what extent should cause me to avoid using the cable for the
50m/165ft+ runs to my HF towers?
Of course, if there is gross migration, a continuity check from inner to
outer
would reveal a short, but would a TDR or other method reveal performance
degradation from lesser amounts of migration?
73, David G3WGN M6O
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