[TowerTalk] Blackened Sheild on Belden Coax?

[Robert S Morris]

I agree with Jim..

Only time I have noticed blackened shield is with water.

Take care
73/Bob
W4MYA

----- Original Message -----
From: "James Sawyer" <wa6znm@jps.net>
To: "Guy Olinger, K2AV" <k2av@contesting.com>; "Ian White, G3SEK"
<g3sek@ifwtech.com>; <towertalk@contesting.com>
Sent: Tuesday, September 19, 2000 8:35 PM
Subject: RE: [TowerTalk] Blackened Sheild on Belden Coax?


>
> It sounds as if you where hit by lightening.
>
> Jim
>
> -----Original Message-----
> From: owner-towertalk@contesting.com
> [mailto:owner-towertalk@contesting.com]On Behalf Of Guy Olinger, K2AV
> Sent: Tuesday, September 19, 2000 5:27 PM
> To: Ian White, G3SEK; towertalk@contesting.com
> Subject: Re: [TowerTalk] Blackened Sheild on Belden Coax?
>
>
>
> Hmmm...
>
> >
> > Tom Rauch wrote:
>
> > >As for current causing it, I've even melted some lines that had the
> > >unfortunate luck of being in the wrong SWR at the wrong time and
> > >never seen the braid change color. I can't imagine the braid getting
> > >so hot as to discolor and not having the dielectric melt!
> >
>
> Well, I split the coax jacket (some old RG8U, not foam) for over a
> hundred feet to check it out. The black gradually reoccurred every 21,
> 22 feet, with clean copper in the middle. What do you think caused that?
>
> I figured I did it during an early mis-informed period when I was
> running 400 watts on 20 meters to a tuner, then thru that coax to a 40
> meter ground plane. It had a 1.5 to one swr on 40 cw straight through
> and took a kW matchbox to tame it on 20. I worked people on 20.
>
> Maybe heat to some degree accelerated the contamination process?
>
> - - . . .   . . . - -     .   . . .     - - .   . - . .
>
> 73, Guy
> k2av@contesting.com
> Apex, NC, USA
>
>
>
>
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