Sharp_CB-4370_Service_Manual维修手册含电器原理图

SHARPSERVICE MANUALOUTSTANDING RECEPTION THE WORLD OVERSYNTHESIZED 40 CHANNELCITIZENS BAND TRANSCEIVERMODELCB-4370-WARNING"change icircuitry that would change or violate the technicalSPECIFICATIONSTransmitter sectionCircuit type.Dual conversion superheterodyne:RF power output…4W (maximum)Phase Locked Loop (P.L.L.)fre-Frequency range ...........27MHz Citizens Bandquency synthesizer provides 40Channels ......................40 chs.P.L.L.(Phase Locked Loop)transmit and receive channels.circuit SynthesizerDelta tuning of 1.0kHz on eachType of crystal.....HC-18Uchannels plus ceramic filterToleranceAuxiliary circuitsAutomatic noise limiter (ANL),10.240MH.·...±0.003%Variable squelch,Transmitter modulation...100%(maximum)Public Address System(P.A.)Modulation limiter......Yields high averagemodulation atGeneralaverage voice levelsAntenna matching.........Nominal 50 ohmsPower source..DC 12.0V NominalCarrier deviation...........Not greater than +800Hznegative or positive groundnominal on (exceeds F.C.C..Antenna50 ohm external antenna for car or baseD.O.C.,etc.requirements)operationHarmonic suppression......Exceeds 60dBSpeaker ......3.1/8P.D.S.8-ohm Imp.Receiver sectionMicrophonePress-to-talk dynamic microphoneAudio power output......3.5 Watts maximum power output(500ohm)Sensitivity.....................0.5uV/m for 10dB S N/N ratioAccessories.Microphone hangerat 30%at 1000Hz modulationMobile mounting bracketChannels....40 chs.P.L.L.(Phase Locked Loop)Mounting screwscircuit SynthesizerMicrophone with plug and cord.Type of crystalHC-18UPower supply cord with fuse holder and11.150MHz....±0.003%socket.Selectivity.6 dB down at±3kHz;Spare fuse (2.3A)60 dB down at±10kHzDimensions2-17/32"(H×6-11/16"W0×Intermediate frequency....Ist-IF:10.695MHz,7-9/16"(D)2nd-IF:455kHzWeight3.8 Ibs.without microphoneCabinet.aa…Metal body with plastic frontSHARP ELECTRONICSCORPORATIONExecutive Office:10 Keystone Place,Paramus,New Jersey07652(201)265-5600Regional Offices Distribution Centers:10 Keystone PlaceParamus,New Jersey07652(201)265-560021580 Wilmington Ave.,Long Beach,Calif.90810(213)830-4470U.S.Subsidiary of Sharp Corporation,Osaka,JapanParts Centers:P.0.Bo×664Paramus,New Jersey07652(201)265-5600P.0.Bo×20394Long Beach,Calif.90801(213)830-4470