Lines rolling on the image & top flickers

[bentech 1]

Hi ,

 

Using a cam with a passive balun with CAT3 (gauge 18) 1000` cable.

 

At the other end , I have an active BLN-AR (GEM) .

 

I have a RG6 cable to connect the LCD monitor to the balun.

 

See image in attachment.

 

Picture is having 2-3 lines rolling from top to bottom and to of the image is bending.

 

Any idea how to improve the signal ?

 

 

[vector18 1]

You have a ground loop. Either change power supply, plug into a different source, or install a ground loop

isolator.

[bentech 1]

You mean that a ground loop will create a top folder and lines rolling on the image ?

 

Can I confirm this with a scope ?

 

Can it just be that the video level is too low ?

[vector18 1]

Have you tried any of my suggestions or you only want to know what's causing it?

[tomcctv 187]

passive baluns both ends. will fix. and how long is your rg6

[bentech 1]

250'

 

I m trying to avoid the Passive at the CAM side.

[tomcctv 187]

250'

 

I m trying to avoid the Passive at the CAM side.

 

 

 

why ??? passive at that distance is not a problem. but 250 of rg6 can also be a problem. can you not go direct with cat5

[Blake CCTV 3]

You can confirm with a scope if you know what your looking for but your picture does smack of ground loop. If the camera is suitable it's better to use a 24c av psu. A good isolation transformer will work if correctly installed.

If you are using an active balun then you will need to use your scope at the DVR end to adjust your lift and gain, ideally this should be done with a pulse and bar generator at the camera end

[bentech 1]

Having one cam with 5VDC (Viking Intercom).

 

The other ones are working on 12VDC.

 

Will have to check the specs of both because the one on 5VDC doesn`t have the 1 V signal , too low.

 

If I use a generator to adjust , maybe the CAM will not have the same output level , no ?

 

What will be the best way to split the CCTV signal ?