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NTSC video conversion - telemetry

NTSC video conversion - telemetry

(OP)
Anybody ever tried to send NTSC video 1vP-P over a
very long wire? I have a 9,000 meter coax cable that
is 30 ohms in resistance from end to end. The application
is an underwater video feed. I have set up a microcontroller
frame grabber and transmitted the data up the wire via
RS-422 and that works (uCFG product), but there is a
30-40 second lag time between pictures.
Any idea how to get NTSC converted and sent up a long
cable realtime?  thanks.  

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