[TowerTalk] Black coax (again)

[chet moore]

 A lightning HIT !!!!!



Chet N4FX
----- Original Message ----- 
From: "Mickey Baker" <fishflorida at gmail.com>
To: "Tom Osborne" <w7why at frontier.com>
Cc: "Towertalk" <towertalk at contesting.com>
Sent: Wednesday, September 15, 2010 5:41 PM
Subject: Re: [TowerTalk] Black coax (again)


> He
>
> Mickey Baker
> NetApp
> Mobile: 954 729 6464
>
> On Sep 15, 2010, at 7:52 PM, "Tom Osborne" <w7why at 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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