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I currently have a robotic cutter which has a BNC female connector connected to a composite video cable. I want to remove this extension cable and simply terminate the cable to a composite video connection, is this at all possible? enter image description here

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  • \$\begingroup\$ You could probably just cut a BNC cable and tape the end off, unless the machine needs it to run. Provide a schematic of the output driver. \$\endgroup\$ – laptop2d Jul 5 '17 at 19:34
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    \$\begingroup\$ By "composite video" you mean RCA? Google BNC to RCA. \$\endgroup\$ – Eugene Sh. Jul 5 '17 at 19:42
  • \$\begingroup\$ @laptop2d what I'm basically asking is; are the cores within each cable identical both sides assuming there will be two cores in each cable so that it's possible for me to solder a rca cable straight to the circuit. \$\endgroup\$ – Lee Sugden Jul 5 '17 at 19:56
  • \$\begingroup\$ They might have a different characteristic impedance. For RF it would be 50Ohm, for video it's 75Ohm. It's about the cables, not connectors. \$\endgroup\$ – Eugene Sh. Jul 5 '17 at 20:05
  • \$\begingroup\$ @LeeSugden - 2 cores in a coax? Nope. Coax has a single core with a shield. There are specialty cables such as shielded twisted pair, but "composite video" usually means a single signal - it is composite due to the combining of video and sync, as in broadcast video. \$\endgroup\$ – WhatRoughBeast Jul 6 '17 at 4:16
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By a "composite video connection" I assume you mean an RCA connector such as you see on the back of a TV. In that case you need a simple "BNC female to RCA male" adapter, which looks like enter image description here

You can find these at places like Radio Shack, or at lots of places on the net.

ETA: In comment, a preference for direct connections due to reliability issues was expressed. The answer to that is simple - yes, such connectors are readily found. RCA connectors are widely used for home video/RF inputs, and something like this are readily available. Search on "RCA connector RG59" as a starting point.

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  • \$\begingroup\$ Even at Amazon - amazon.com/RiteAV-BNC-Female-Male-Adapter/dp/B000V1O1L2/… \$\endgroup\$ – Michael Karas Jul 5 '17 at 19:50
  • \$\begingroup\$ Yes that's the one, the thing is I have tried these connectors time and time again they all fail eventually or cause interference with all my other camera equipment. Circuit board side I was wondering if I could solder a rca cable to it in place of the current BNC cable or would this not be possible? \$\endgroup\$ – Lee Sugden Jul 5 '17 at 19:53
  • \$\begingroup\$ @LeeSugden - See edit. \$\endgroup\$ – WhatRoughBeast Jul 6 '17 at 0:09
  • \$\begingroup\$ @LeeSugden - you are unlikely to achieve a better result during the first several attempts at replacing the connector than using a quality adapter. If you do decide to replace the connector, spend some time studying the difference between connectors meant to be crimped vs those meant to be soldered. \$\endgroup\$ – Chris Stratton Jul 6 '17 at 2:13

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