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File:Superheterodyne frequency graph.svg

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Summary

Description
English: Graph showing how a superheterodyne radio receiver receives a radio signal, shifting it down to the IF frequency. The frequency spectrum of the desired radio transmission is shown at RF. it consists of a carrier wave at the center frequency (dark blue) with sidebands representing the modulation (light blue) on either side. This is mixed with the signal from the local oscillator (LO) at a lower frequency. The result is a heterodyne (beat) signal called the intermediate frequency at the difference of these two frequencies IF = RF − LO. This is amplified and bandpass (red) filtered in the IF amplifier, and passed through a detector to extract the modulation (M).

The receiver can also receive signals at the image frequency LO − IF, so an image rejection filter (red) is needed on the input .to reject this frequency
Date
Source Own work
Author Chetvorno

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Captions

Graphs illustrating how a superheterodyne receiver works

Items portrayed in this file

depicts

22 January 2016

18,849 byte

329 pixel

1,061 pixel

image/svg+xml

c77cd3b34f890db8ded18957ffc1c234b875fb38

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Date/TimeThumbnailDimensionsUserComment
current04:07, 26 January 2016Thumbnail for version as of 04:07, 26 January 20161,061 × 329 (18 KB)ChetvornoMoved labels around
18:07, 23 January 2016Thumbnail for version as of 18:07, 23 January 20161,044 × 337 (18 KB)ChetvornoIncreased size of font
06:49, 23 January 2016Thumbnail for version as of 06:49, 23 January 20161,044 × 337 (18 KB)ChetvornoReduced font size
06:42, 23 January 2016Thumbnail for version as of 06:42, 23 January 20161,044 × 337 (18 KB)ChetvornoExtended graph to right to leave more room for text labels
06:30, 23 January 2016Thumbnail for version as of 06:30, 23 January 20161,000 × 336 (19 KB)ChetvornoMoved text to make it look better
06:27, 23 January 2016Thumbnail for version as of 06:27, 23 January 20161,000 × 336 (19 KB)ChetvornoMoved text to prevent cropping
06:18, 23 January 2016Thumbnail for version as of 06:18, 23 January 20161,000 × 336 (19 KB)ChetvornoUser created page with UploadWizard

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