Thanks for your input Steve...this is good info, and could be the issue
here, as the severed coax was above ground level (barely), however most of
the run is underground and I expect the same deterioration. Whatever the
cause, I think this whole run is gonna get pulled up and replaced. Replaced
with WHAT is still up for grabs.
Tnx es 73
----- Original Message -----
Sent: Tuesday, June 14, 2011 10:55 AM
Subject: Re: [TowerTalk] BLACKENED BRAID?
> Here's what it says in the Coax chapter (page 140) in my UP THE TOWER
> (_www.championradio.com_ (http://www.championradio.com) ).
>> Another advantage of RG-213/U is that the jacket is made
> from non-contaminating PVC unlike regular RG-8/U. Any cable used
> outdoors is subject to years of sunlight abuse. The UV radiation
> from sunlight causes a chemical reaction with the standard PVC jacket
> material and the chloride from the jacket material (polyvinyl chloride,
> remember?) starts to migrate, or leach, toward the inner dielectric
> and through the copper braid. Not only does the braid get all gummed
> up, but also it degrades the performance of the coax and it only gets
> worse over time. In an extreme case, the chloride will coat each
> strand of braid and actually insulate each strand from the others.
> You’ll have continuity on each strand but not from one to the other.
> The SWR of the coax (not the antenna) will rise over time due to this
> feedline degradation and you’ll have to replace it. If you are in the
> Sunbelt or are at a higher than average elevation, the non-contaminating
> jacket is probably mandatory.
> So your problem is either this or water incursion.
> Steve K7LXC
> Champion Radio Products
> Cell 206-890-4188
> TowerTalk mailing list
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