How do I test a coaxial connection to see if it's "active"?

I'm not sure how to even ask this. When my basement was finished coaxial cable was run from various outlet boxes in each room to a central spot in the basement. At this central location few of the cables are terminated with a connector. I can handle putting connectors on, but I'm wondering if there is a way to test each cable to see which room it runs to. I was thinking I could disconnect one of the connections where the satellite comes in (and heads upstairs) and test each unknown cable with this connection. Trouble is, I don't want to lug a receiver and tv in to each room to test the connection just to be able to say "ok, this cable goes to room A." Is there any kind of tester that I could connect to each outlet that will indicate that there's something going on at the other end of the cable or not?