Long VGA BNC Cable in wall with loose BNC connector

[[email protected]]

Hi,
We've recently moved into a condo that has a long VGA->BNC cable wired
from a homerun location to our living room. The blue (not that it
matters) BNC connector is loose so our VGA signal occassionally looses
color. Replacing this cable isn't an option so I'd like to simply
replace the BNC connector.

I assume this involves somehow stripping the cable and clamping on a
new BNC connector. The outer diameter of the blue cable/wire is on the
order of 3/32".

Knowing nothing about hardware (hey, I'm a software guy , I don't
know whether there is a wire under the insulation that needs to be
stripped or a coax type wire that needs a more sophisticated tool to
strip it. Also, is there a standard size for the wire end of the BNC
connector?

Any pointers in the correct direction for solving this problem would be
appreciated. Clearly, if this wasn't embedded in our wall, I would
just buy a new cable.
Thanks,
arn

 

[Allodoxaphobia]

Hi,
We've recently moved into a condo that has a long VGA->BNC cable wired
from a homerun location to our living room. The blue (not that it
matters) BNC connector is loose so our VGA signal occassionally looses
color. Replacing this cable isn't an option so I'd like to simply
replace the BNC connector.

I assume this involves somehow stripping the cable and clamping on a
new BNC connector. The outer diameter of the blue cable/wire is on the
order of 3/32".

Knowing nothing about hardware (hey, I'm a software guy , I don't
know whether there is a wire under the insulation that needs to be
stripped or a coax type wire that needs a more sophisticated tool to
strip it. Also, is there a standard size for the wire end of the BNC
connector?

Any pointers in the correct direction for solving this problem would be
appreciated. Clearly, if this wasn't embedded in our wall, I would
just buy a new cable.

And, Google was no help?
Google quickly gave me this -- for 1 'style' of BNC connector (there are
a few different types -- all probably suitable for your application.)

http://www.lnl.com/howto/termination/bncs.htm

Jonesy

 

[NSM]

| Hi,
| We've recently moved into a condo that has a long VGA->BNC cable wired
| from a homerun location to our living room.

Computer VGA? If so, not possible. Somewhere there is an electronic adaptor
in the system.

....

N

 

[James Sweet]

| Hi,
| We've recently moved into a condo that has a long VGA->BNC cable wired
| from a homerun location to our living room.

Computer VGA? If so, not possible. Somewhere there is an electronic adaptor
in the system.

...

N

I've seen ~30' VGA cables with BNC's on the end for projectors, works ok for
640x480. Either way he said wiggling the connector effects this, so I'd say
it's pretty obvious the problem is in that area.

 

[[email protected]]

Jonesy,
Thanks for your reply and sorry if I'm being dense but would a vga
breakout cable have the individual lines (r,g,b,h,v) as coax? That is
really my question. It seems awfully thin. In any event, google has
not been helpful in understanding what is going on here. I've tried.
It isn't just a termination question but understanding what the make-up
of these standard cables is.

James, NSM
The problem is definitely in the connector. If I wiggle the blue BNC
connector, there isn't a problem. I can also put a probe on both ends
(attached with a long wire) and see there isn't a continuity problem in
the wire itself.

Again, any help would be appreciated.

 

[NSM]

| Jonesy,
| Thanks for your reply and sorry if I'm being dense but would a vga
| breakout cable have the individual lines (r,g,b,h,v) as coax? That is
| really my question. It seems awfully thin. In any event, google has
| not been helpful in understanding what is going on here. I've tried.
| It isn't just a termination question but understanding what the make-up
| of these standard cables is.
|
| James, NSM
| The problem is definitely in the connector. If I wiggle the blue BNC
| connector, there isn't a problem. I can also put a probe on both ends
| (attached with a long wire) and see there isn't a continuity problem in
| the wire itself.

Sorry, you have multiple BNCs? That wasn't clear to me. In that case, yes, I
would expect each to be a separate coax. You can solder or crimp the center
pin on. The shield is usually captured by the connector.

N

 

[Michael Squires]

I've seen ~30' VGA cables with BNC's on the end for projectors, works ok for
640x480. Either way he said wiggling the connector effects this, so I'd say
it's pretty obvious the problem is in that area.

I'm using a 25' KVM (Belkin) cable alleged to support XGA right now.

Mike Squires

 

[Allodoxaphobia]

| Jonesy,
| Thanks for your reply and sorry if I'm being dense but would a vga
| breakout cable have the individual lines (r,g,b,h,v) as coax? That is
| really my question. It seems awfully thin. In any event, google has
| not been helpful in understanding what is going on here. I've tried.
| It isn't just a termination question but understanding what the make-up
| of these standard cables is.
|
| James, NSM
| The problem is definitely in the connector. If I wiggle the blue BNC
| connector, there isn't a problem. I can also put a probe on both ends
| (attached with a long wire) and see there isn't a continuity problem in
| the wire itself.

Sorry, you have multiple BNCs? That wasn't clear to me. In that case, yes, I
would expect each to be a separate coax. You can solder or crimp the center
pin on. The shield is usually captured by the connector.

Yes, it was not clear to me that there were 3 lines, either. Ok, three
separate RG-62 (?) lines terminated with BNC connectors would no doubt
be the "individual lines (r,g,b...". Probably (somewhere buried
in the wall) there is a break-out of the RGB lines in the VGA cable and
the long run(s) completed with RG-62 (? 92 ohm -- probably not RG-59 or
RG-58) to provide decent video "at a distance."

Jonesy

 

[James Sweet]

I'm using a 25' KVM (Belkin) cable alleged to support XGA right now.

Mike Squires

Entirely possible, the long cable I dealt with was fairly old and had
ghosting at XGA resolutions.

 

[jakdedert]

I've seen ~30' VGA cables with BNC's on the end for projectors, works
ok for 640x480. Either way he said wiggling the connector effects
this, so I'd say it's pretty obvious the problem is in that area.

In the a/v presentations industry, 50' runs from laptop to projector are
very common...mostly XGA resolution these days.

jak