[TowerTalk] Strange coax failure

[Richard Solomon]

If you can find a TDR, like a Tektronix, you can see where the defect is.

73 es HH, Dick, W1KSZ

On Mon, Dec 15, 2014 at 12:19 PM, Ray Benny <rayn6vr at cableone.net> wrote:
>
> Patrick,
>
> I had a case once of a shorted coax due to a manufacturing defect. The coax
> was a 100 ft piece. I had first cut off the connectors one at a time but
> found the coax still shorted. I cut the coax in half, one half open, the
> other shorted. I kept cutting the shorted section in half until I had about
> a 6 inch shorted piece remaining. I slid off the braid and found that
> during the manufacturing process the center conducted was bent outward and
> through the dielectric causing a direct contact with the braid. Don't know
> why the short was not caught in a QC check, but maybe only random
> pieces/rolls were checked.
>
> In the end, I still had 50ft of coax to use, plus a bunch of shorter
> pieces...
>
> Ray,
> N6VR
>
> On Mon, Dec 15, 2014 at 11:09 AM, Tom Osborne <w7why at frontier.com> wrote:
> >
> > Hi Patrick
> >
> > Don't think I'd cut them in half.
> >
> > I'd just cut the plugs off and replace them and check the cable again.
> > Might be something in the plugs that are bad and you would be wasting a
> > bunch of cable.
> >
> > If still bed, then start cutting them.  73
> > Tom W7WHY
> >
> >
> > On 12/15/2014 8:09 AM, Patrick Greenlee wrote:
> >
> >> I'm going to cut the bad jumper in half and test the halves and then cut
> >> the bad piece in half and test those pieces.  Whichever is bad will
> then be
> >> dissected carefully to see, if possible, what was physically wrong with
> the
> >> coax.  This is a real head scratcher for me.  The good news is I'm back
> on
> >> the air with a pan adapter full of signals again and loving it.
> >>
> >> Patrick     NJ5G
> >>
> >
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