[TowerTalk] Blackened Sheild on Belden Coax?
Mike Gilmer - N2MG
19 Sep 2000 12:38:04 -0700
On Tue, 19 September 2000, K7LXC@aol.com wrote:
> I've heard good logical explainations that the chlorine in
> the PVC (polyvinyl choride remember) reacts with UV and causes the jacket
> material migration through the coax shield thus blackening it. That's why
> RG-213 with a non-contaminating jacket is preferred for outdoor applications.
> OTOH someone a couple of years ago mentioned an engineer that worked for
> Belden or other cable manufacturer that claimed it was ENTIRELY due to water
> migration. I tried tracking the guy down for clarification but was never able
> to get ahold of him. Maybe someone will do the research and let us know.
I won't argue about the possible reactions of UV and chlorine.
I found a slit in my coax's (RG213) jacket that had been
outside, laying on the ground for ~2 years - the black stuff
was all around the slit, and a few feet up and down the
coax. Nowhere else.
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