[[File:Radio transmission waves(AM and FM).gif|thumbnail|The Audio Signal (top) is transmitted on a carrier wave by modifying the [[amplitude]] (middle) or [[frequency]] (bottom)]]'''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 [[baby|newborn]]s for [[seizure]]s via [[EEG]].<ref>B. Boashash, editor, “Time-Frequency Signal Analysis and Processing – A Comprehensive Reference”, Elsevier Science, Oxford, 2003; ISBN 0-08-044335-4</ref>
==See Alsoalso==* '''[[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 radiocommunication technologies]]
* '''[[Amateur Radio]]:''' [[Emergency communicationsElectromagnetic wave]], [[Amateur radio operatorFrequency]], [[Call signmodulation]], [[Amateur radio repeateramplitude]], [[Base stationamplitude modulation]](AM), [[Amateur radio frequency allocationsShortwave]], [[Amateur radio high bandsWalkie-talkie]], [[Amateur Citizens band radio station]], [[UHF]], [[VHF]], [[HF]], [[Morse code]], [[Telegraph]], [[General Mobile rigRadio Service]], [[QSL card]]* '''[[Antenna (radio)]]:''' [[Antenna theoryGMRS]], [[Portable operation (amateur radio)]], and [[Dipole antenna]], [[Coaxial cable]], [[Balun]], [[Packet radio]], [[Propagation]], [[Protecting your HT Antenna]]* '''Multi-Use Radio Standards Organization:''' [[FCCService]], [[American Radio Relay League]], [[International Telecommunication Union]] ([[ITU]])
* '''[[Amateur Radio]]:''' [[Selecting a radio]], and [[Telegraph]]
* '''[[Antenna (radio)]]:''' [[Dipole antenna]], [[Homebrew antennas]], and [[Propagation]]* '''Radio Standards Organization:''' [[FCC]], [[American Radio Relay League]] * [[Satellite]]: [[GPS]]* '''[[Cellular telephone]]:'''** [[Apple Computer|Apple]] [[iOS]] for [[iPhone]] or [[iPad]]** [[Android (operating system)|Android]]** [[BlackBerry OS|Blackberry]]** [[Microsoft]] [[Windows]] Phone with [[Windows 8]]** [[Cell phone health scare]], [[Mobile phones and brain tumor risk]]* [[Bug-out bag]] ==Further Readingreading==
* 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).
==External links==
* [http://thesurvivalpodcast.com/forum/index.php?topic=28989.0 A Walkie Talkie For your BOB]
* [http://thesurvivalpodcast.com/forum/index.php?topic=32100.0 Two Way Radio Range Estimates]
==References==
[[Category:Telecommunications]]
[[Category:Communication]][[Category:Amateur RadioElectrical Engineering]]
[[Category:Radio]]