Frequency modulation

Frequency modulation (FM) is a signaling method that varies the carrier frequency in proportion to the amplitude of the modulating signal.

Frequency modulation is most commonly used in radio, amateur radio, radar, telemetry, seismic prospecting, and in the monitoring of newborns for seizures via EEG.

See Also

• Radio: Radio waves, Electromagnetic wave, Radio frequency, AM/FM, modulation, amplitude, amplitude modulation (AM), frequency modulation (FM), or single-sideband modulation (SSB), Shortwave, Two-way radio, Portable radio, Walkie-talkie, Citizens band radio, Family Radio Service (FMS), General Mobile Radio Service (GMRS), Multi-Use Radio Service (MRS), Motorola, Marine VHF radio, History of radio

• Amateur Radio: Emergency communications, Amateur radio operator, Call sign, Amateur radio repeater, Base station, Amateur radio frequency allocations, Amateur radio high bands, Amateur radio station, UHF, VHF, HF, Morse code, Telegraph, Mobile rig, QSL card
• Antenna (radio): Antenna theory, Portable operation (amateur radio), Dipole antenna, Coaxial cable, Balun, Packet radio, Propagation, Protecting your HT Antenna
• Radio Standards Organization: FCC, American Radio Relay League, International Telecommunication Union (ITU)

Further Reading

• A. Bruce Carlson. Communication Systems, 4th edition. McGraw-Hill Science/Engineering/Math. 2001. ISBN 0-07-011127-8, ISBN 978-0-07-011127-1.
• Gary L. Frost. Early FM Radio: Incremental Technology in Twentieth-Century America. Baltimore: Johns Hopkins University Press, 2010. ISBN 0-8018-9440-9, ISBN 978-0-8018-9440-4.
• Ken Seymour, AT&T Wireless (Mobility). Frequency Modulation, The Electronics Handbook, pp 1188-1200, 1st Edition, 1996. 2nd Edition, 2005 CRC Press, Inc., ISBN 0-8493-8345-5 (1st Edition).