File:Modulated radio signal frequency spectrum.svg

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Summary

Description
English: The frequency spectrum of a typical AM or FM modulated radio signal, as it would be seen on a spectrum analyzer. The vertical axis is signal strength or voltage, the horizontal axis is frequency. It consists of a strong carrier wave (C) at the frequency fC of the radio transmitter. The information (modulation) carried by the signal is contained in two narrow frequency bands above and below the carrier frequency, called sidebands (SB). The sidebands are symmetrical about the carrier. In an audio radio broadcast the sidebands carry the audio signal that represents the sound waves. The portions of the sidebands close to the carrier contain the low audio frequencies, while the portions further from the carrier contain the high audio frequencies. Therefore the sidebands tend to fall off farther from the carrier, and also close to the carrier at points which represent bass frequencies below 20 Hz, the lower human hearing limit.
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Author Chetvorno
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Captions

Frequency spectrum of a radio signal

Items portrayed in this file

depicts

spectrum

carrier wave

Sideband

inception

5 April 2017

File history

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Date/TimeThumbnailDimensionsUserComment
current23:44, 28 January 2019Thumbnail for version as of 23:44, 28 January 2019437 × 284 (14 KB)ChetvornoAdded bandwidth of signal
15:44, 9 May 2017Thumbnail for version as of 15:44, 9 May 2017450 × 262 (10 KB)ChetvornoAnother try at fixing invalid SVG
02:37, 9 May 2017Thumbnail for version as of 02:37, 9 May 2017450 × 262 (10 KB)ChetvornoReplaced invalid Inkscape SVG with "plain SVG" version which is valid
23:43, 5 April 2017Thumbnail for version as of 23:43, 5 April 2017450 × 262 (13 KB)ChetvornoUser created page with UploadWizard
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