I've been pondering how to do this.
Our house has TV aerial points in most of the rooms, they are all fed from a powered UHF splitter in the loft. Helpfully nothing is labelled.
In our kitchen/diner we have a TV fed by a Sky input (directly) which we want to feed to the other TV. Both have a coax wall socket connected to the loft splitter. I can feed the output of the MySky to the loft via an IOLink and a cable into the wall, what i then need to do is find which cable is which. I got a cable tester which can do coax, you put one end on the wall socket and it will indicate by process of elimination which one it is in the loft. However, the tester came with no leads to attach it to the wall - all one has is a bnc on it and the other rj45. Confused.com. Anyone ever done this-surely its not that hard ?
Short the core and the shield and use a multimeter to test for 0 vs infinite (ish) resistance.
A bit more would be helpful - I assume short the plug on the wall then test the end in the loft. If its 0 then ....