There are two methods that can be used alone or together depending on your system requirements. In such a radio receiver a local oscillator lo is used to heterodyne or beat against the incoming radio frequency rf generating sum and difference frequencies.
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Radio frequency rf is the oscillation rate of an alternating electric current or voltage or of a magnetic electric or electromagnetic field or mechanical system in the frequency range from around 20 khz to around 300 ghzthis is roughly between the upper limit of audio frequencies and the lower limit of infrared frequencies.
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The first is to use a filter to prevent the image frequency from ever getting to the mixer input.
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These are the frequencies at which energy from an oscillating.
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Image response or more correctly image response rejection ratio or imrr is a measure of performance of a radio receiver that operates on the superheterodyne principle.
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Ok then how do you prevent the image frequency from ending up in the if band.
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F f lo f rf f f image f lo f rf 2f if.
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