Carrier current is a method of low-power broadcasting that uses the electrical system of a building to distribute an AM radio signal. This is one method used for college and high school radio, particularly if the signal is only intended to be picked up in a small area. Many established college radio stations originally began as carrier current stations. While the technology is still used by a number of student-run stations today, the popularity declined beginning in the 1980s, as popular music radio formats quickly migrated to the FM band. The popularity of streaming audio over the internet has hastened this decline. Low-power broadcasting is the concept of broadcasting at very low power and low cost, to a small community area. ... Mediumwave radio transmissions (sometimes called Medium frequency or MF) are those between the frequencies of 300 kHz and 3000 kHz. ... College radio (also known as university radio or campus radio) is a type of radio station that is run by the students of a college or university. ... While being popular material for teen-oriented television series and movies, radio stations licensed to American high schools have always been rare. ... // Events and trends The 1980s marked an abrupt shift towards more conservative lifestyles after the momentous cultural revolutions which took place in the 60s and 70s and the definition of the AIDS virus in 1981. ... Popular music is music belonging to any of a number of musical styles that are accessible to the general public and mostly distributed commercially. ... A radio format or programming format describes the overall content broadcast on a radio station. ... Frequency modulation (FM) is a form of modulation which represents information as variations in the instantaneous frequency of a carrier wave. ... Streaming media is just-in-time delivery of multimedia information. ...

Carrier current stations generally only have an effective radiated power of a few watts. Transmitters that use carrier current are very simple, making them an effective option for students interested in radio. Transmissions can be of good quality, although there is reportedly a 60 hertz background hum (in North American installations) associated with carrier current. In radio telecommunications, effective radiated power or ERP is determined by subtracting system losses from system gains. ... The hertz (symbol Hz) is the SI unit of frequency. ... World map showing location of North America A satellite composite image of North America North America is a continent in the northern hemisphere, bounded on the north by the Arctic Ocean, on the east by the North Atlantic Ocean, on the south by the Caribbean Sea, and on the west...

Because of the simple design and the fact that the transmitter doesn't need an external antenna, carrier current listening devices have found some use in the world of espionage. Espionage is the practice of obtaining secrets (spying) from rivals or enemies for military, political, or economic advantage. ...

Student-run carrier current stations

This is an incomplete list. Please add to this list if you are aware of an omission. As with most other student-run stations, these stations often operate on sporadic schedules. Most of these stations are also supplemented by other broadcasting methods, such as LPFM, closed circuit, and streaming audio. These stations are NOT licensed by the FCC and their call letters are entirely self-styled. Low-power broadcasting is the concept of broadcasting at very low power and low cost, to a small community area. ... television cameras for surveillance. ... Streaming media is just-in-time delivery of multimedia information. ... The FCCs official seal. ... Call sign can refer to different types of call signs: Airline call sign Aviator call sign Cosmonaut call sign Radio and television call signs Tactical call sign, also known as a tactical designator See also: International Callsign Allocations, Maritime Mobile Service Identity This is a disambiguation page — a navigational aid...

• KASR-1260 Arizona State University
• KRFH-610 Humbloldt State University
• KUTE-1620 University of Utah
• WPPJ-670 Point Park College