Sharp_CB-750A_Service_Manual维修手册含电器原理图

SHARPSERVICE MANUALOUTSTANDING RECEPTION THE WORLD OVER23 ChannelCB TransceiverMODELCB-750A"WARNINGIt is unlawful for the user to make any replacement or substitution ofh的cqulations or tyoe peceotenee i orohibited.SPECIFICATIONSTransmitter sectionCircuit type..................Dual conversion superheterodyne:Collector power input.....5W (maximum)P.L.L.circuit frequency synthesizerFrequency range..............27MHz Citizens Bandprovides 23Channels23 chs.P.L.L.(Phase Locked Loop)transmit and receive channels.circuit 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 squelch,Modulation limiter..........Yields high average modulation atPublic Address System (P.A.)average voice levelsAntenna matching ......Nominal 50 ohmsGeneralCarrier deviation..............Not greater than 800HzPower s0urCe.DC 12.0V Nominal (DC 10.8 to 15.6V)nominal on (exceeds F.C.C.,negative or positive groundD.O.C.,etc.requirements)Antenna.........................50 ohm external antenna for car or baseHarmonic suppression.....Exceeds 50dBoperationSpeaker.....3-1/8Receiver sectionP.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 hangerChannels...23 chs.P.L.L.(Phase Locked Loop)Mobile mounting bracketcircuit SynthesizerMounting screwsType of crystal ..............HC-18U+0.005%toleranceMicrophone with plug and cord.(at-22°F~+140°F)Power supply cord with fuse holder andSelectivity.6dB down at t3zsocket.50 dB down at±1okHzSpare fuse (2.3A)Intermediate frequency....Ist-IF:11.275MHz,Dimensions.2-i/4"(D×5-3/4(W)×7.7/8"(D)2nd-IF:455kHzWeight...........3.6 lbs.with microphoneCabinet..........Metal body with plastic frontSHARP ELECTRONICSCORPORATIONExecutive 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