He
Mickey Baker
NetApp
Mobile: 954 729 6464
On Sep 15, 2010, at 7:52 PM, "Tom Osborne" <w7why@frontier.com> wrote:
> BlankHi All
>
> I recently took some 75 foot sections RG-8X coax off of a pair of 40 meter
> verticals and found the center and shield was all black. I mentioned it
> here and some said it was from water ingress.
>
> I was playing with these pieces of coax yesterday and found that if I cut 5
> feet off the antenna end, the shield was nice and bright, but the center
> conductor was all black.
>
> I took the coax fittings off at the shack end and found the same thing--the
> shield was nice and shiny, but the center conductor was all black, so there
> is no way it could be from water. Also, the antennas are lower than the
> house so the water couldn't run up hill through the bulkhead to the antenna
> switch. The connectors are Amphenol.
>
> The center conductor is stranded, and each strand is all black. I would
> assume that the wires are all insulated from each other due to the
> discoloration. It almost looks like the wire got hot, but I only run 500
> watts into matched antennas, so the SWR shouldn't be a factor.
>
> What, besides water, would turn the center conductors black? 73
> Tom W7WHY
>
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