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| View Original: | Superheterodyne frequency graph.svg (1018x296) | |||
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| Keywords: Superheterodyne frequency graph.svg 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 ˆ’ LO This is amplified and bandpass red filtered in the IF amplifier and passed through a detector to extract the modulation M <br/><br/> The receiver can also receive signals at the image frequency LO ˆ’ IF so an image rejection filter red is needed on the input to reject this frequency 2016-01-22 own Chetvorno other versions cc-zero Superheterodyne circuits Sideband | ||||
