Odd Video Output

[able1 0]

Hello all,

 

I have customer with one camera that is showing a strange video distortion.

This is a CVBS video direct to a monitor. No DVR is involved.

Please look at the picture that is on dropbox.

 

 

Well it seems that the image link is not working. At least for me. Not sure what I might

be doing wrong. The following is a almost simulation. It is overlaid on the video picture.

.............................................

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Although I can simulate it here the dots above are at an angle on the screen

and are white in color. The white dot lines are moving up across the screen.

I have never seen this type of signal distortion before and was wondering if anyone would know what would cause the problem.

 

I have connected another camera to the monitor and it is good.

I switched to a 2nd input to the monitor distortion dots still there.

I have power cycled everything and it returns on power up.

When I connect my test monitor to the coax nothing is displayed.

 

This is very odd so looking for some insight.

 

Thanks in advance.

 

Les

[the toss 0]

Is it a progressive scan monitor or an interlace monitor ? Looks a lot like it could be the scan retrace which would indicate a bad monitor.

[able1 0]

toss,

 

I placed another camera directly to the monitor and the picture was good.

 

This is a Neovo SK-19P monitor that has multiple inputs.

I tried the CVBS1 and CVBS2 and got the same results.

 

The camera/monitor setup has been in since about 2014 and this distortion

just started about 3 days ago.

 

Were you able to see the picture i posted on dropbox??

 

Thanks for the quick response.

 

Les

[able1 0]

After having a night to sleep on this issue I realized

and forgot to mention that at the camera it is

installed in a box camera type enclosure. This is

set up with a heater and blower that may be powered

at 24vac. The camera is a something brand that

operates on 12vdc.

 

The enclosure is maybe 15 years old and may have had

a box camera installed at that time. It was repalced

with a bullet camera about 4 years ago.

 

I know anything is possible but, could it be that the

24vac fan now be causing some bad RF that is getting into

the signal of the camera feed??

 

Yesterday I connected another camera at the enclosure to

test and got NO video at all. Reconnected original camera

and went back to distorted video.

 

Anybody have any thoughts or experience with this sort

of video distortion??

 

Thanks in advance!!

 

Les

[BrightLight9 0]

You have to check out the output voltage of the enclosure. Does it suits your camera up? Does the supply for camera come through the enclosure? The enclosure is old and the capacitors could be damaged and that gives lines. You can plug your camera without the enclosure if you know how or try other enclosure.

[able1 0]

Hello All,

 

I continue this thread (1) because it is Sunday and I have nothing

else better to do and (2) I will consider this educational. Maybe the

dissertation will help someone in the future.

 

As the original poster on this challenge I was hoping for a quick solution.

With about 60 views in about 4 days since I posted the question

this seems to NOT have a easy solution. Or maybe the right person

has not logged in as of yet. So I will list again what has NOT worked to

isolate the problem.

 

I will post again the picture. If it does not show then right click

and open the image in another tab.

 

 

The camera is powered by a 12VDC wall wart on Siamese Cable

The enclosure has a heater/blower that is powered by another

source and I suspect it it 24VAC. All is in separate conduits

up to the enclosure. The video is on CVBS video format. The

bigger challenge is that the camera is about 24 feet up on a

outside wall and only accessible by extension ladder. The cable

is inside a 3/4" rigid conduit from camera to monitor.

 

>> When I disconnect camera power the video picture goes away

however the distortion remains on the screen intermittently.

 

>> When I switch to the CVBS2 input to the monitor nothing changes.

 

>> When I disconnect the BNC at the monitor and replace with a new

camera the video is clear and good.

 

>> When I check video from the existing camera on my test monitor

there is NO video.

 

>> When I install a new camera at enclosure on existing coax NO video

is received at the monitor. Uses existing power.

 

>> When I disconnect the 24VAC power at the enclosure to disable the

heater/blower the distorted video does not change. (Did this late Friday)

 

The oldest part of this install is the Siamese RG59 cable. Maybe 15 Years old

The plan is replace the cable with new and see what changes if anything.

 

Personally I am baffled as to what is causing the problem. I would

like to remove the camera and connect to my test monitor but this

camera is a critical part of the operation. I tried to swap it out

but with no video to the monitor I had to revert back to the original

and work on a different plan. I really want to know what I am fighting here.

Nothing I do points it a specific direction.

 

Sorry this got to be a long read.

 

At this point I don't expect a reader to jump in with a "Ahh Haa Moment"

that will break the open what I am missing.

 

If the new cable fixes or not I will post that information. Should happen

later this coming week.

 

Thanks for reading.

 

Les

[the toss 0]

Hello All,

 

I continue this thread (1) because it is Sunday and I have nothing

else better to do and (2) I will consider this educational. Maybe the

dissertation will help someone in the future.

 

As the original poster on this challenge I was hoping for a quick solution.

With about 60 views in about 4 days since I posted the question

this seems to NOT have a easy solution. Or maybe the right person

has not logged in as of yet. So I will list again what has NOT worked to

isolate the problem.

 

I will post again the picture. If it does not show then right click

and open the image in another tab.

 

 

The camera is powered by a 12VDC wall wart on Siamese Cable

The enclosure has a heater/blower that is powered by another

source and I suspect it it 24VAC. All is in separate conduits

up to the enclosure. The video is on CVBS video format. The

bigger challenge is that the camera is about 24 feet up on a

outside wall and only accessible by extension ladder. The cable

is inside a 3/4" rigid conduit from camera to monitor.

 

>> When I disconnect camera power the video picture goes away

however the distortion remains on the screen intermittently.

this would indicate the distortion does not originate from the camera>> When I switch to the CVBS2 input to the monitor nothing changes.

 

>> When I disconnect the BNC at the monitor and replace with a new

camera the video is clear and good.

this would indicate the distortion is generated by the cable /connectors or camera. Since the test above has discounted the camera then we are left with the cable/connectors as the source of the problem

>> When I check video from the existing camera on my test monitor

there is NO video.

since your monitor is showing distorted video this would indicate your test monitor is faulty>> When I install a new camera at enclosure on existing coax NO video

is received at the monitor. Uses existing power.

this would again point to your cable/connectors being the problem>>

When I disconnect the 24VAC power at the enclosure to disable the

heater/blower the distorted video does not change. (Did this late Friday)

this shows your heater/blower is not the source of your problem

The oldest part of this install is the Siamese RG59 cable. Maybe 15 Years old

The plan is replace the cable with new and see what changes if anything.

 

Personally I am baffled as to what is causing the problem. I would

like to remove the camera and connect to my test monitor but this

camera is a critical part of the operation. I tried to swap it out

but with no video to the monitor I had to revert back to the original

and work on a different plan. I really want to know what I am fighting here.

Nothing I do points it a specific direction.

 

Sorry this got to be a long read.

 

At this point I don't expect a reader to jump in with a "Ahh Haa Moment"

that will break the open what I am missing.

 

If the new cable fixes or not I will post that information. Should happen

later this coming week.

 

Thanks for reading.

 

Les

 

 

I'm beginning to think you may have more than one problem here since you have conflicting test results , but generally it looks like being your cable/connectors. Coax will not degrade with age unless it is damaged somehow so start with replacing your BNC connectors and see how you go

[able1 0]

 

>> When I disconnect camera power the video picture goes away

however the distortion remains on the screen intermittently.

 

this would indicate the distortion does not originate from the camera

 

>> When I switch to the CVBS2 input to the monitor nothing changes.

 

>> When I disconnect the BNC at the monitor and replace with a new

camera the video is clear and good.

this would indicate the distortion is generated by the cable /connectors or camera.

Since the test above has discounted the camera then we are left with the

cable/connectors as the source of the problem

 

>> When I check video from the existing camera on my test monitor

there is NO video.

 

since your monitor is showing distorted video this would indicate your test monitor is faulty

 

Actually my test monitor is not faulty it just can't see

the distorted video from the camera on the existing cable.

It works just fine on all other video feeds.

 

>> When I install a new camera at enclosure on existing coax NO video

is received at the monitor. Uses existing power.

this would again point to your cable/connectors being the problem>>

 

I'm beginning to think you may have more than one problem here since you have conflicting test results , but generally it looks like being your cable/connectors. Coax will not degrade with age unless it is damaged somehow so start with replacing your BNC connectors and see how you go

 

Thanks Toss,

 

The plan is to install a second camera in the future. Will be replacing the existing

coax and at the same time pull in a second for the new camera.

I will be using the existing coax as a pull string. So regardless if the problem

goes away, I will never know if it is the cable or the connectors.

I was thinking cable but now with your input the connectors would be suspect

since they are the PITA twist on type. I hate those connectors.

They are this type.

https://www.ebay.com/itm/BNC-Male-Twist-on-RG59-Connector-for-CCTV-Coax-Coaxial-Security-Cameras/142224223950?hash=item211d396ece:g:1DkAAOSw0hlZJVww

 

I would like to play around and replace the connectors just to prove or disprove

but because of the time involved to do so, it is not cost effective. Also there

is really no service loop to speak of. So cable length is another issue.

 

What is puzzling is how a connector (if that is what is going on) can cause

such a distortion and strange test results.

 

Thanks for the input!!

 

Les

[tomcctv 190]

Hi. Les.

 

The dots on image Could also mean 12v into a 24v camera.

 

Also bad BNC but this usually also shows camera white out every now and again.

 

If your looking for a temp fix till you run new cable I would do this.... Disconnect power to enclosure (your 24v) and then I would use that cable for the 12v for your camera........ Your shotgun cable I would use the power as your video ....using baluns and don't use the coax. Then see what your image is like

[able1 0]

Hi. Les.

 

The dots on image Could also mean 12v into a 24v camera.

 

Also bad BNC but this usually also shows camera white out every now and again.

 

If your looking for a temp fix till you run new cable I would do this.... Disconnect power to enclosure (your 24v) and then I would use that cable for the 12v for your camera........ Your shotgun cable I would use the power as your video ....using baluns and don't use the coax. Then see what your image is like

 

Hi Tom,

The camera uses Siamese cable and has a 12VDC wall wart connected

to the 18/2 power leads that feeds direct to the camera.

This particular camera has been in (so I am told) about 4 years.

This problem started just last week.

 

I don't know the make and model of the camera but it appears to be small

bullet that was put inside a very old enclosure. I am very sure it is a 12VDC

camera because of the above.

 

The 24VAC feeds through a separate conduit and goes directly to the Heater/Blower

circuit board. Power source is unknown. Although it does come out of a 8" x 8"

junction box that has a lot of other 14 gauge wires, some are 120VAC.

 

There is no way to do as you suggest.

 

I do thank you for your thoughts.

 

Have a good week.

 

Les

[able1 0]

Hello all again,

 

Returning with followup information on this odd video issue.

https://www.dropbox.com/s/7y8kgnnt2fd382f/IMG_5102.JPG?dl=0

 

The decision was made after much testing that the problem must

be with the cable or terminations and the manager needed something

to work properly. The decision was to replace the camera and

cable. AND to install a second camera be a backup spare

for any future problems. Just a matter of swapping cables and plug

in the other power supply.

 

During the tear out I pulled in two new Siamese cables using the existing

as a pull string. I cut off the cable ends with some extra cable so that

I could test and evaluate later. Saved the camera and the power supply.

 

The new camera install was difficult (way beyond normal)

but the install is now completed and both new cameras have very good pictures.

The second camera is idle and not powered, and is ready at any time, if needed.

 

That was yesterday and today had a little time to investigate the other

camera a cable.

 

I first powered up the camera with the original power supply and connected

to my test monitor. Excellent Picture??

 

I then trimmed back the coax cable and checked and it is a solid copper core.

 

I then soldered the center cores together as well as the braided shield.

Again patched to my test monitor. Excellent Picture??

 

I then jiggled around with the "twist on" BNC connectors. No change in the

picture, not even a flicker.

 

I then unscrewed a little at a time the connectors and at some point at about

two turns or so, no picture. Screwed back on and picture.

Nothing I did re-created the video pattern from before.

 

Except for a missing chunk of cable of about 80 feet and the fact that it

is not connected actually on site as it was, the difference is really not understandable.

 

Honestly what am I missing here??

 

All indications were the cable or the connectors were the issue somehow.

 

Some may say "Just give up and move along". Well I could........... but won't!!

 

I then took the actual cable and did a resistance check on the center core and

the copper braid. I had ended up with two sections each about 40 feet long or so.

 

I checked the one and got .8 ohms end to end on both the center core and braid.

There was no short between the two.

 

I then checked the other section. Center core about .8 ohms. The braid showed

an OPEN. WHAT??? I then cut that section in half and one was good

the other was open. I then cut in half again, and again one was good the

other was open. I then cut in half again, now the sections were about

5-6 feet long. I noticed a small section on the one about 2" long that

did not appear as the rest of the cable. I used my razor knife and split

the sheath. The attached picture is what was found.

 

https://www.dropbox.com/s/yo4dcafwr05v31r/Coax%20Cable.JPG?dl=0

 

This is labeled Honeywell P/N6508 RG59/U CCTV+2 cable.

https://www.honeywellcable.com/Pages/Product.aspx?pid=6508

 

Please note that it specs out with (CCA) Copper Clad Aluminum for the

Braid Shield. The bad section is about 10"-11" long. on either side the braid

looks great. The outer sheath shows no obvious damage or cuts.

 

Keep in mind that this was INSIDE of Rigid Conduit. Estimated time installed

to be about 15 years or maybe 5 years since this particular camera was installed.

Unknown to be sure. I am going to guess 5 years since I think the original

box camera would have not needed Siamese cable.

 

Some how this has been growing for many years and just got so bad it

distorted the video. I am a bit curious, if it had been solid copper braid

I wonder if it would have ever been an issue.

 

TOTALLY Boggles the mind!!! But, I can NOW sleep nights.

 

Sorry for the long read.

But, it was worth the typing so the read had to be easy.

Maybe, (just maybe) it will help some other struggling Tech with

a similar challenge in the future.

 

Sweet dreams all.

 

Les

[the toss 0]

cant see the pic you posted so a verbal description of what you found would be appreciated. BUT - I dont know why you persisted with the screw on BNC

[able1 0]

cant see the pic you posted so a verbal description of what you found would be appreciated. BUT - I dont know why you persisted with the screw on BNC

 

Sorry Toss,

 

Don't know why the pics don't show up.

Try clicking on the below. Hopefully one of them will get you there.

 

Right Click here and choose "Open in a New Tab"

 

https://www.dropbox.com/s/yo4dcafwr05v31r/Coax%20Cable.JPG?dl=0

 

The picture shows serious corrosion on the wire braid.

 

I didn't "persist" with the twist on BNC.

I only wanted to see if they were the problem on not.

 

I certainly did not use them on the new cameras.

 

Thanks,

 

Les