Thanks for all the thoughts both on- and off-reflector.
I'm initially concluding that inner conductor migration is not the reason for
the 'store vertically' warning on the drums.
I'll do a TDR and impedance sweep of the cable before use but I'm guessing it's
good to go. Unless you know different...?
73, David G3WGN M6O
-----Original Message-----
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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