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For want of a nail . . .

 
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nuckolls.bob(at)aeroelect
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PostPosted: Sat May 26, 2018 7:50 am    Post subject: For want of a nail . . . Reply with quote

Spent too many hours and way too many dollars
chasing gremlins from an antenna system only
to discover that one of my SWR test coaxes
had an INTERMITENT short. Made for some very
confusing readings and misguided actions.

Only accidently noticed that my anomalous readings
manifested when coax behind the connector was
subject to the right side-pressure. Swapped
out the cable and the antenna refurbishment
task moved forward after replacement of stuff
that didn't need replacing.

Tore down the connector and found a couple
of 'whiskers' hanging out of the center
pin crimp.

[img]cid:7.1.0.9.0.20180526104126.056b8060(at)aeroelectric.com.0[/img]

Just long enough to come within a few micro-inches
of shorting the coax . . . putting the right
force vector on the coax would close the gap.

This was a commercially assembled test jumper
that has been hanging on my cable rack for
at least 15 years . . . just goes to show ya . . .


Bob . . .


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BARRY CHECK 6



Joined: 15 Mar 2011
Posts: 738

PostPosted: Sun May 27, 2018 3:06 am    Post subject: For want of a nail . . . Reply with quote

How long is a Short?
On Sat, May 26, 2018 at 11:49 AM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
Quote:
Spent too many hours and way too many dollars
chasing gremlins from an antenna system only
to discover that one of my SWR test coaxes
had an INTERMITENT short. Made for some very
confusing readings and misguided actions.

Only accidently noticed that my anomalous readings
manifested when coax behind the connector was
subject to the right side-pressure. Swapped
out the cable and the antenna refurbishment
task moved forward after replacement of stuff
that didn't need replacing.

Tore down the connector and found a couple
of 'whiskers' hanging out of the center
pin crimp.

[img]cid:7.1.0.9.0.20180526104126.056b8060(at)aeroelectric.com.0[/img]

Just long enough to come within a few micro-inches
of shorting the coax . . . putting the right
force vector on the coax would close the gap.

This was a commercially assembled test jumper
that has been hanging on my cable rack for
at least 15 years . . . just goes to show ya . . .


  Bob . . .


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echristley(at)att.net
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PostPosted: Sun May 27, 2018 6:21 pm    Post subject: For want of a nail . . . Reply with quote

I hope that is not a "that's what she said" joke.


On Sunday, May 27, 2018 7:08 AM, FLYaDIVE <flyadive(at)gmail.com> wrote:



How long is a Short?

On Sat, May 26, 2018 at 11:49 AM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
Quote:
Spent too many hours and way too many dollars chasing gremlins from an antenna system only to discover that one of my SWR test coaxes had an INTERMITENT short. Made for some very confusing readings and misguided actions. Only accidently noticed that my anomalous readings manifested when coax behind the connector was subject to the right side-pressure. Swapped out the cable and the antenna refurbishment task moved forward after replacement of stuff that didn't need replacing. Tore down the connector and found a couple of 'whiskers' hanging out of the center pin crimp. [img]cid:7.1.0.9.0.20180526104126.056b8060(at)aeroelectric.com.0[/img] Just long enough to come within a few micro-inches of shorting the coax . . . putting the right force vector on the coax would close the gap. This was a commercially assembled test jumper that has been hanging on my cable rack for at least 15 years . . . just goes to show ya . . . Bob . . .



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BARRY CHECK 6



Joined: 15 Mar 2011
Posts: 738

PostPosted: Mon May 28, 2018 3:31 am    Post subject: For want of a nail . . . Reply with quote

Not at all Ernest;
Not that all "That's what see said," jokes are bad.
It's an engineering joke:  How long is a Short?
As long as it takes the Technician to find it.
Its like a 'Knock - Knock" joke.
A knock - knock joke would not work without a door.
It's like "One Hand Clapping".
Barry
On Sun, May 27, 2018 at 10:21 PM, Ernest Christley <echristley(at)att.net (echristley(at)att.net)> wrote:
Quote:
I hope that is not a "that's what she said" joke.


On Sunday, May 27, 2018 7:08 AM, FLYaDIVE <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote:



How long is a Short?

On Sat, May 26, 2018 at 11:49 AM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
Quote:
Spent too many hours and way too many dollars chasing gremlins from an antenna system only to discover that one of my SWR test coaxes had an INTERMITENT short. Made for some very confusing readings and misguided actions. Only accidently noticed that my anomalous readings manifested when coax behind the connector was subject to the right side-pressure. Swapped out the cable and the antenna refurbishment task moved forward after replacement of stuff that didn't need replacing. Tore down the connector and found a couple of 'whiskers' hanging out of the center pin crimp. [img]cid:7.1.0.9.0.20180526104126.056b8060(at)aeroelectric.com.0[/img] Just long enough to come within a few micro-inches of shorting the coax . . . putting the right force vector on the coax would close the gap. This was a commercially assembled test jumper that has been hanging on my cable rack for at least 15 years . . . just goes to show ya . . .   Bob . . .










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