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时间: 2020-1-13 14:50
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DesignandConstructionofFMTransmitterandReceiverDesignandConstructionofFMTransmitterandReceiverFinalReportDavidChenAbstract:OurFMtransmitterandreceiverarebuiltwithdiscreteanalogcomponentsandintegratedontwocircuitboards.Themodulationschemeusesasuperheterodynesetup,inwhichtheintermediatecarrierisat300-kHzandthetransmissioncarrierisat24.3-MHz.Using711-mWofDCpower,thetransmitteroutputsa5-dBmsignalcenteredat24.3-MHzwith100-kHzbandwidth.Usingabouthalfasmuchpower,around342-mW,thereceivercandetectincomingsignalsatpowersaslowas-110dBm.Thisreceptivityleveltranslatestosuccessfulaudioreceptionatdistancesofalmost2-kmfromthetransmittingantennaatopPackard.DesignTheory:Transmitter:Thetransmitterisdesignedtotakeasignalintheaudiorang……