Composite video, over 12v DC rail

[kyndal]

im looking for a "simple" way to combine Analog Composite (NTSC/PAL)
video signal and a 12v DC rail. and take it back out,

basically i need to feed a camera with (9-12v) DC but would like to
use only 2 signal lines (12v DC and Gnd) and cut out the video line
all together (so i can use simpler rotating connectors)

im thinking about feeding the AC video signal through a capacitor
onto the 12v rail. and pick it out the same way with a DC coupling capacitor

i believe the composite signal is referenced to 0v (Gnd) with a VPP peak of
a little over 1 volt.
so i figure that there should be no 12V DC offset on that video signal
before and after the caps this way ??

one problem i see, is the DC rail being stabilized to ground with
Capacitors in the power supply. that would eat the signal


any Ideas out there?

/Kyndal

 

[montech]

The problem with your approach is you would not get the coupling you need to get good video response. Its the curse of technicians to always find a simple solution to a complex problem. Your better off just using 4 wire each a twisted 2 pair like a cat 5 or something. Check some CCTV sites for more info.