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Article: FM Transmitters
- Article from:
- Encyclopedia of Espionage, Intelligence, andSecurity
CopyrightCOPYRIGHT 2004 The Gale Group Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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FM Transmitters
FM (frequency modulation) transmitters can yield a number of results, depending on their power and range. Extremely low-power transmitters can be used in very small locales, for purposes such as eavesdropping. At the high end, radio transmitters are sometimes used for propaganda and psychological warfare through broadcasting. Between these extremes are the low-power radio transmitters, capable of making every user a broadcaster, that have long been an issue of concern for the Federal Communications Commission (FCC).
Mini transmitters, which have a range of about 50 feet(15.2 m), are available commercially to serve purposes such as that of a baby monitor, but are ...