Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Carrier current is a method of low power AM broadcasting that does not require a broadcast license in the United States, but is allowed on the campus of any school, so long as the normal FCC Part 15 Rules are adhered to when measured at the edge of the campus. Most college radio stations started out this way, using 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. 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. Carrier current stations generally only have an effective radiated power of a few watts. These signals cannot pass through transformers, however, and are prone to the electromagnetic interference from alternating current. Transmitters that use carrier current are very simple, making them an effective option for students interested in radio.

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