I've handled many hundreds of reels of Heliax over decades, and never
worried much about that warning, which has more to do with creating egg
shaped cable (from the weight of the upper layers) than to center
conductor migration. Heliax is very robust. Measure the impedance if
you'd like, but I'd bet that it's still perfect if it's been kept dry.
-Steve K8LX
On 4/12/2016 2:33 PM, David Aslin G3WGN wrote:
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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