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[[File:SysTUT7 15.png|thumb|750px|The graph of the transmitted signal (yellowlight blue), received signal (light blueyellow), mixer and the output beat signal (dark redblue) .]]</td></tr></table> The figure below shows the input and output signals of the lowpass filter , i.e. the mixer's down-converted output (dark blue)signal and the filtered output beat signal: <table><tr><td>[[File:SysTUT7 22.png|thumb|750px|The graph of the input and output signals of the lowpass filter.]]
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