The Design and Control of Scouting Receiver Based On DDS

This paper presents a way of producing automatic/manual adjustable sine sweep signal to obtain the local oscillator signal by controlling the DDS(direct digital frequency synthesizer) chip AD9850,achieving automatic and manual search within the full-10MHz-108MHz frequency range,a specific frequency range and specify the frequency,automatically displaying the search to the external signal frequency and power-down stores while identifying external signal modulation mode: FM,AM,amplitude method.