Frequency deviation: Difference between revisions
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imported>MichaelMaggs Adding local short description: "Concept in radio transmission", overriding Wikidata description "used in FM radio to describe the maximum difference between an FM modulated frequency and the nominal carrier frequency;sometimes mistakenly used as synonymous with frequency drift" |
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'''Frequency deviation''' (<math>f_{\Delta}</math>) is used in [[Frequency modulation|FM radio]] to describe the difference between the minimum or maximum extent of a frequency modulated signal, and the nominal center or [[carrier frequency]]. The term is sometimes mistakenly used as synonymous with [[frequency drift]], which is an unintended offset of an oscillator from its nominal frequency. | {{Short description|Concept in radio transmission}} | ||
'''Frequency deviation''' (<math>f_{\Delta}</math>) is used in [[Frequency modulation|FM radio]] to describe the difference between the minimum or maximum extent of a frequency modulated signal, and the nominal center or [[carrier frequency]].<ref name="pn">{{cite book |last1=Nahin |first1=Paul |title=The Mathematical Radio: Inside the Magic of AM, FM, and Single-Sideband |date=2024 |publisher=Princeton University Press |location=Princeton |isbn=9780691235318 |pages=74,210-214}}</ref> The term is sometimes mistakenly used as synonymous with [[frequency drift]], which is an unintended offset of an oscillator from its nominal frequency. | |||
The frequency deviation of a radio is of particular importance in relation to [[Bandwidth (signal processing)|bandwidth]], because less deviation means that more channels can fit into the same amount of [[frequency spectrum]]. The [[FM broadcasting]] range between 87.5 and 108 MHz uses a typical channel spacing of 100 or 200 kHz, with a maximum frequency deviation of +/-75 kHz, in some cases leaving a buffer above the highest and below the lowest frequency to reduce interaction with other channels.<ref>[http://hyperphysics.phy-astr.gsu.edu/hbase/audio/radio.html Radio Broadcast Signals<!-- Bot generated title -->]</ref> | The frequency deviation of a radio is of particular importance in relation to [[Bandwidth (signal processing)|bandwidth]], because less deviation means that more channels can fit into the same amount of [[frequency spectrum]]. The [[FM broadcasting]] range between 87.5 and 108 MHz uses a typical channel spacing of 100 or 200 kHz, with a maximum frequency deviation of +/-75 kHz, in some cases leaving a buffer above the highest and below the lowest frequency to reduce interaction with other channels.<ref>[http://hyperphysics.phy-astr.gsu.edu/hbase/audio/radio.html Radio Broadcast Signals<!-- Bot generated title -->]</ref> | ||
Latest revision as of 13:47, 20 November 2025
Template:Short description Frequency deviation () is used in FM radio to describe the difference between the minimum or maximum extent of a frequency modulated signal, and the nominal center or carrier frequency.[1] The term is sometimes mistakenly used as synonymous with frequency drift, which is an unintended offset of an oscillator from its nominal frequency.
The frequency deviation of a radio is of particular importance in relation to bandwidth, because less deviation means that more channels can fit into the same amount of frequency spectrum. The FM broadcasting range between 87.5 and 108 MHz uses a typical channel spacing of 100 or 200 kHz, with a maximum frequency deviation of +/-75 kHz, in some cases leaving a buffer above the highest and below the lowest frequency to reduce interaction with other channels.[2]
The most common FM transmitting applications use peak deviations of +/-75 kHz (100 or 200 kHz spacing), +/-5 kHz (15–25 kHz spacing), +/-2.5 kHz (3.75-12.5 kHz spacing), and +/-2 kHz (8.33 kHz spacing, 7.5 kHz spacing, 6.25 kHz spacing or 5 kHz spacing).
See also
References
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