Difference between revisions of "Frequency modulation"

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'''Frequency modulation''' ([[FM]]) is a signaling method that varies the carrier [[frequency]] in proportion to the [[amplitude]] of the modulating signal.  
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[[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)]]
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'''Frequency modulation''' (FM) is a signaling method that varies the carrier [[frequency]] in proportion to the [[amplitude]] of the modulating signal.  
  
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==See Also==
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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>
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* '''[[Radio]]:''' [[Radio waves]], [[Electromagnetic wave]], [[Radio frequency]], [[AM/FM]], [[modulation]], [[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]],
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* '''[[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]]
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==See also==
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* '''[[Antenna (radio)]]:''' [[Antenna theory]], [[Portable operation (amateur radio)]], [[Dipole antenna]], [[Coaxial cable]], [[Balun]], [[Packet radio]], [[Propagation]], [[Protecting your HT Antenna]]
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* [[Radio communication technologies]]
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* '''Radio Standards Organization:''' [[FCC]], [[American Radio Relay League]], [[International Telecommunication Union]] ([[ITU]])
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* '''[[Radio]]:''' [[Electromagnetic wave]], [[Frequency]], [[modulation]], [[amplitude]], [[amplitude modulation]] (AM), [[Shortwave]], [[Walkie-talkie]], [[Citizens band radio]], [[General Mobile Radio Service]] ([[GMRS]]), and [[Multi-Use Radio Service]]
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* '''[[Amateur Radio]]:''' [[Selecting a radio]], and [[Telegraph]]
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* '''[[Antenna (radio)]]:''' [[Dipole antenna]], [[Homebrew antennas]], and [[Propagation]]
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* '''Radio Standards Organization:''' [[FCC]], [[American Radio Relay League]]
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* [[Satellite]]: [[GPS]]
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* '''[[Cellular telephone]]:'''
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** [[Apple Computer|Apple]] [[iOS]] for [[iPhone]] or [[iPad]]
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** [[Android (operating system)|Android]]
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** [[BlackBerry OS|Blackberry]]
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** [[Microsoft]] [[Windows]] Phone with [[Windows 8]]
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** [[Cell phone health scare]], [[Mobile phones and brain tumor risk]]
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* [[Bug-out bag]]
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==Further reading==
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* A. Bruce Carlson. ''Communication Systems, 4th edition.'' McGraw-Hill Science/Engineering/Math. 2001. ISBN 0-07-011127-8, ISBN 978-0-07-011127-1.
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* 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.
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* 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).
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==External links==
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* [http://thesurvivalpodcast.com/forum/index.php?topic=28989.0 A Walkie Talkie For your BOB]
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* [http://thesurvivalpodcast.com/forum/index.php?topic=32100.0 Two Way Radio Range Estimates]
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==References==
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{{reflist|2}}
  
  
 
[[Category:Telecommunications]]
 
[[Category:Telecommunications]]
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[[Category:Communication]]
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[[Category:Electrical Engineering]]
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[[Category:Amateur Radio]]
 
 
[[Category:Radio]]
 
[[Category:Radio]]

Latest revision as of 22:53, June 27, 2016

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 newborns for seizures via EEG.[1]

See also

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).


External links

References

  1. ↑ B. Boashash, editor, “Time-Frequency Signal Analysis and Processing – A Comprehensive Reference”, Elsevier Science, Oxford, 2003; ISBN 0-08-044335-4
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