Kerry 0 Posted September 19, 2011 Hello. I am doing a CCTV install for a friend's restaurant. He originally had several cheap black and white cameras set up from from a previous install. I upgraded him to color IR cameras and DVRs several months ago. He now wishes to use the old black and white cameras as well. I am going to be purchasing another DVR to use with the B/W cameras. Here is my question. The B/W cameras do not have BNC nor DC power connectors. There are just 4 single wires coming from the cameras: red, black, white and yellow. I am assuming red is +DC, black is -DC, yellow is video and white is audio (they have a mic, I believe). Red/black I will connect to a power supply and audio will not be used. I'm a little confused on how to get the video connected using baluns with screw ternminals and cat5 cabling. I know normally with screw terminal baluns you would plug the camera-end BNC into a balun, have one wire of a twisted pair in one screw terminal and the other wire in the other terminal (for positive/negative), then do the same with the DVR-end balun. But if I have only one yellow video wire coming from this camera and I want to connect it in some way to a long cat5 cable, then convert it to BNC so it can go to the DVR, how would I accomplish this? What connections would I need to make with the 1 yellow wire, cat 5 cable, and screw terminal baluns to do this? Thank you in advance for your help Share this post Link to post Share on other sites
Birdman Adam 0 Posted September 19, 2011 With BNC connectors, the center pin is the video, and the outer shell is the shield/ground. So yellow wire would be connected to the center, black to ground. Black is also used as ground for power (this is indicative of cheap cameras). Not sure how you should really go about doing this... I would probably open up the balun and solder the yellow to the center-pin connection and black to ground inside the balun. Yea its a 'hack' way to go, but what else can you do when you just have wires! Share this post Link to post Share on other sites
rory 0 Posted September 19, 2011 If you are 100% sure the white is not ground for the video, then the video shares its ground from the power - someone cut off the connector from the camera cable. Perhaps ... PSU + >> Camera red PSU - >> Camera black balun + >> Camera yellow balun - >> PSU - / Camera black Mic + >> Camera white Mic - >> PSU - / Camera black though I never tried this with a balun. Share this post Link to post Share on other sites
Kerry 0 Posted September 20, 2011 I am pretty sure the white is for a microphone. There is a small dot on the front of the camera that looks like it would be a mic, and I was told that the old setup had both yellow and white RCA cables going into the old DVR (and the white RCA ends were marked "audio"). How can I have the one black wire going to the - terminal on the balun and also the - on the PSU? Share this post Link to post Share on other sites
Kerry 0 Posted September 20, 2011 Actually, I should mention what I really want to do is Camera with single wiring -> Cat5 cable (for length) -> Balun w/ screw terminals -> DVR So what wires would I connect from the loose wiring on the camera to the Cat 5 cable? Should I take one twisted pair and have the Camera yellow -> solid wire of twisted pair, and Camera black -> striped wire of twisted pair...then have the solid wire -> + terminal on balun and striped wire -> - terminal on balun? Would that work? Share this post Link to post Share on other sites
