It's fairly unusual these days to find a home with only one TV set. But it's certainly not unusual to find a home with one audio/video setup - say a VCR, DVD perhaps. How do you get audio and video signals from the source to the remote TV set?

And what if you have cable/satellite TV? It's very unusual to find homes with more than one cable or satellite receiver.

Running cables is one way. But it's often not easy - sometimes nearly impossible to do a neat (hidden) job. And it's so passé these days, since there is a much simpler way to do it: you transmit the audio and video signals via dedicated transmitters and receivers.

Sounds expensive? Not at all. Especially if you use these pre-built 2.4GHz modules from Oatley Electronics. They are called "kits" but all you have to do is connect suitable 12V DC power supplies (and they have those, very cheap too!). Of course, you're going to need a source of audio/video (and suitable RCA connection leads) for the transmitter, and leads to connect the audio and video outputs of the receiver to your suitably-equipped TV set. (No RF output is available; your TV needs to have direct video and audio inputs. Fortunately, most modern sets do have such inputs).

To preclude any interference from, say, a neighbour using similar modules/frequencies (or even other 2.4GHz devices which are now legion), both the transmitter and receiver modules have four channels, set on the PC boards via a four-way switch. As long as both are set the same, they should talk to each other. And if there is interference, simply select another channel. Four LEDs on each PC board identify the channel in use.