Sharp_CB-800_Service_Manual维修手册含电器原理图

SHARPSERVICE MANUALOUTSTANDING RECEPTION THE WORLD OVERREVISED EDITION23 ChannelCB TransceiverMODELCB-800"WARNING"person halding a commercial lat or 2nd radio cearator'sechangeSPECIFICATIONSTransmitter sectionCircuit type...................Dual conversion superheterodyne:Collector power input.....5W (maximum)crystal frequency synthesizerFrequency range…27MHz Citizens Bandprovides 23 crystal controlledChannels.23 chs.Crystal controlledtransmit and receive channels.SynthesizerDelta tuning of +1.0kHz on eachType of crystalHC-18U+0.005%tolerancechannels plus ceramic filter.(at-22°F~+140°F)Auxiliary circuits.......Automatic noise limiter (ANL),Transmitter modulation...100%(maximum)Variable squelchModulation limiter...........Yields high average modulation atPublic Address System (P.A.)average voice levelsAntenna matching........Nominal 50 ohmsGeneralCarrier deviation..............Not greater than 800HzPower source..................DC 12.0V Nominal (DC 10.8 to 15.6V)nominal on (exceeds F.C.C.,negative or positive groundD.O.C.,etc.requirements)Antenna50 ohm external antenna for car or baseHarmonic suppression......Exceeds 50dBoperationReceiver sectionSpeaker.…3-l/8P.D.S.8-ohm ImpAudio power output......3 Watts maximum power outputMicrophone…Press talk dynamic microphoneSensitivity .................0.7uV/m for 10dB S+N/N ratio(500ohm)at 30%at 1000Hz modulationAccessories.......Microphone hangerChannels23 chs.Crystal controlledMobile mounting bracketSynthesizerMounting screwsType of crystal................HC-18U0.005%toleranceMicrophone with plug and cord.(at-22F~+140°F)Power supply cord with fuse holder andSelectivity ......................6dB down at t3kHz;socket.50 dB down at±10kHzSpare fuse (2.3A)Intermediate frequency...Ist-IF:11.275MHz,Dimensions2-1/4"(H)×5-3/4"(W)×7-7/8"(D)2nd-IF:455kHzWeight....…3.6 lbs.with microphoneCabinet...............Metal body with plastic frontSHARP ELECTRONICS CORPORATIONExecu e Office:10 Keystone Place,Paramus,New Jersey07652(201)265-5600Regional Offices Distribution Centers:10 Keystone Place,Paramus,New Jersey07652(201)265-560021580 Wilmington Ave.Long Beach,Calif.90810(213)830-4470U.S.Subsidiary of SHARP Corporation,Osaka,Japan