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I am a mechanical engineer. Trying to build a computer vision system using endoscopic camera. I have a camera with 4 pin input, 2 input pins for power supply of 5 volt and 2 input pins for video signal transmission. I am using a 2+1 coaxial cable for video signal and power supply transmission. My camera is continuously moving at a certain speed, which causes the coaxial cables to break from inside. Since my application needs a robust cable with smaller dimension, around 4mm OD, I want to change the cable to CAT5 OR Unitronic FD Lapp cables (which has high torsional strength). Analog camera with led arrays and 4 pin input

Can I use a cat 5 or other simple multicore cables instead of coaxial cable.? Why should I use only coaxial cable? I like to simply substitute the coaxial center strand and insulation with normal multicore cable. Will it work efficiently in long run ? I have tried an experiment, video signals where getting transmitted but suddenly the camera does not work. Dont know what has gone wrong with the camera.

Kindly suggest a possible solution. Thank you very much !

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    \$\begingroup\$ You'll need a balun at least. Not only are you going from an unbalanced coaxial cable to a balanced cat5e/cat6 cable, you are probably changing impedances as well. \$\endgroup\$ – Hearth Oct 15 '18 at 13:03
  • \$\begingroup\$ Are you currently using a flex-rated coaxial cable? They do exist for a reason. \$\endgroup\$ – Chris Knudsen Oct 15 '18 at 13:03
  • \$\begingroup\$ @ chris Knudsen: I am sorry for my poor knowledge in electrical. I dont think I am using a flex rated cable. I using a simple 3+1 cable that is used for any CCTV Camera available in market \$\endgroup\$ – Soma Sundaram Oct 15 '18 at 13:09
  • \$\begingroup\$ @ Felthry: Is it possbile to get same impedence as coaxial cable in cat5e or any other cables ? \$\endgroup\$ – Soma Sundaram Oct 15 '18 at 13:11
  • \$\begingroup\$ Look for RG179 cable like this one. It's strong but very flexible. You can supply power separately with silicone pair \$\endgroup\$ – Maple Oct 15 '18 at 13:19
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For motion applications, one should really use "flex-rated" cables. It really does not take long for 'typical' cables to fail when exposed to repetitive motion applications.

Flex cables are expensive, but they will solve your problem. Patching in other cable types may give you a bit more longevity, but the cables will still fail.

Flex-rated cables are designed such that not only the inner conductors last longer (more/finer strands, and additional non-conductive elements), but also the outer jackets can slide against each other and not chafe as much.

Flex cables are available for single and multi-conductor cords, as well as coaxial cable. You can find them by searching for "Flex cables" or "continuous motion cables".

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