Microbroadcasting is the process of broadcasting
a message to a relatively small audience. This is not to be confused with low-power broadcasting
Microbroadcasting, in radio terms, is the use of low-power transmitters (often Title 47 CFR Part 15
in the United States, or its equivalent elsewhere) to broadcast a radio signal over the space of a neighborhood or small town.
Similar to pirate radio
broadcasting, microbroadcasters generally operate without a license from the local regulation body, but sacrifice range in favor of using legal power limits (for example, 100 mW for medium wave
broadcasts in the United States). Higher power levels can be achieved using carrier current
techniques, which are widely used in colleges and universities. Both AM
bands are used, although AM tends to have better propagation characteristics at low power.
Microbroadcasting is also used by schools and businesses to serve just the immediate campus of the operation; well-known uses include audio tour
guide systems, airport information services, and drive-in theater
s, which often provide movie audio over the driver's car audio system. It has also been adopted as an advertising technique, particularly by car dealers and real estate agents.
Toward Polymorphous Radio
by Tetsuo Kogawa—article about the Mini-FM movement (microbroadcasting in Japan) in the 1980s.