In article , Dave Plowman (News)
writes

It still needs to be a video balancing transformer, though. Last I heard
they were about 40 quid each, and you'd need one each end.

He might be able to scrounge a couple of baluns used to convert coaxial
(10 base 2) Ethernet to twisted pair and vice-versa. I know they're 50
ohm as opposed to the 75 ohm of RG59 coax, but it should be okay for
short runs for CCTV.

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..sigmonster on vacation