Matronics Email Lists Forum Index Matronics Email Lists
BBS Forum Interface to the Matronics Email Lists
 
 Get Email Distribution Too!Get Email Distribution Too!    FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

For want of a nail . . .

 
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> AeroElectric-List
View previous topic :: View next topic  
Author Message
nuckolls.bob(at)aeroelect
Guest





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 . . .


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List



1dea928b.jpg
 Description:
 Filesize:  130.62 KB
 Viewed:  364 Time(s)

1dea928b.jpg



Shorted_BNC.jpg
 Description:
 Filesize:  154.96 KB
 Viewed:  364 Time(s)

Shorted_BNC.jpg


Back to top
BARRY CHECK 6



Joined: 15 Mar 2011
Posts: 730

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 . . .


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List



1dea928b.jpg
 Description:
 Filesize:  130.62 KB
 Viewed:  355 Time(s)

1dea928b.jpg


Back to top
View user's profile Send private message Send e-mail
echristley(at)att.net
Guest





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 . . .



- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List



1dea928b.jpg
 Description:
 Filesize:  130.62 KB
 Viewed:  343 Time(s)

1dea928b.jpg


Back to top
BARRY CHECK 6



Joined: 15 Mar 2011
Posts: 730

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 . . .










- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List



1dea928b.jpg
 Description:
 Filesize:  130.62 KB
 Viewed:  340 Time(s)

1dea928b.jpg


Back to top
View user's profile Send private message Send e-mail
Display posts from previous:   
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> AeroElectric-List All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group