[TowerTalk] Inner conductor migration in Heliax(TM)

[David Aslin G3WGN]

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 at contesting.com" <towertalk at contesting.com>
Subject:	[TowerTalk] Inner conductor migration in Heliax(TM)
From:	David Aslin G3WGN <david at 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