Video over UTP

[Jlotz]

I am working on an ROV (submarine) that needs to send a colour analog video signal over 500 ft of UTP Cat 5. I have done this before in the same application but purchased some baluns for $2 each. For this new ROV I would like to work that circuitry into my own PCB to save room in the ROV. There will be no power wires beside the UTP to the surface. I need it to be very simple and ideally under $2 per end. I have 5V on the controller and 19.2,12 & 5V on the ROV. The purchased baluns I used were passive so they did not required power. The camera I use is a $12 product, so it is not HD or anything. I think is is 420 lines.

Any help is appreciated. The only thing I have found so far is a setup on this webpage, but I'm not sure what power requirements it needs.
http://www.edn.com/archives/1995/081795/17di3.htm#fig1


Thanks,
Jeff

[Tomi Engdahl]

It is an interesting circuit.

LM6181 data at http://www.national.com/mpf/LM/LM6181.html says:

Supply Min 7 Volt
Supply Max 32 Volt
Supply Current Per Channel 7.5 mA
Output Current 130 mA

So from this the absolute maximum current per output driver would be 130mA + 7.5 mA
When having two output drivers then total output maximum current would be below 280 mA
In normal application I would expect the normal operating current be be considerably less..
I would quess than average current consumption for transmitter side would be below 100 mA.
And approximately half or less for receiver side.


Some more information and links to circuits/information on video over twisted pair wiring can be found at
http://www.epanorama.net/links/wire_av.html#utpvideo