[TowerTalk] Strange coax failure

[Mark Stennett]

A time domain reflectometer would eliminate the guess work and show you where the defect was on the line.

73 de na6m


> On Dec 15, 2014, at 13:19, 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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