Most radio stations have two locations.
The studio is where the DJ works, playing music and commercials. The signal your radio receives is beamed from the transmitter site . There are many pieces of equipment in the studio required to produce radio programming. Microphones, computer systems, tape players, CD players, and even the telephone are availible to the announcer to play over the air. They are all connected to a mixer , which mixes all of these sounds together in a way which the announcer needs.