How can you build a device that produces radio waves?

[milessisk]

how can you build a device that can produce radio waves?

 

[G01]

A radio wave transmitter is just an electrical oscillator oscillating at frequencies in the radio range. This article should be of some help to you:http://electronics.howstuffworks.com/radio.htm

 

[Mentz114]

And here's one you can build yourself -
http://www.zen22142.zen.co.uk/Circuits/rf/amtx.htm