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We use a MAX7450 video signal conditioner ic on GB3GV, G8OBP built the circuit, so don't know where he the found info.
Did a quick Google CQTV 222 page 19 for a start, lots of references on the web.
Not many connections once you have the chip, possibly, getting rather old now?
Nothing using discreet components though comes to mind.
Weekend looks good!
Have found this at R.S, hope link works, http://uk.rs-online.com/web/p/products/ ... mpn=w1g130