CRE-8900_维修维护电器原理图手册

CRE8900SPECIFICATIONSGeneralFrequency coverage28.000MHz~29.700MHzNumber of channels60Channel step10Hz,100Hz,1KHz,10KHzClass of emissionAM(A3E)FM(F3E)/USB LSB(J3E)Frequency ControlPhase-Locked-Loop SynthesizerAntenna Impedance500Working temperature-30℃~+55℃Frequency Tolerance0.005%Frequency Stability0.001%Power Supply13.8VDC±15%Grounding MethodNegative groundCurrent DrainTransmitter:6A(max.)Receiver:about 400mA(max.)800mA(noise reductions)Dimensions (Wx Hx D)250×280×60mmWeightApprox.2.8kgAntenna ConnectorUHF,SO239RECEIVERMaximum sensitivity1.0uV(-107dBm)FM ModeSINAD:20dB1.0uV(-107dBm)AM ModeSINAD:10dB0.25uV(-119dBm)SSB ModeSINAD:10dBSelectivityAM/FM:6dB@3KHz,50dB @9KHzSSB:6 dB@2.1KHz,60dB @3.3KHzImage RejectionMore than 65dBIF FrequencyAM/FM:10.695 MHz 1st IF,455 KHz 2nd IFSSB:10.695 MHzAdjacent-ChannelAM/FM 60dB SSB:70 dBRF Gain Control45 dB adjustable for optimum signal receptionAutomatic Gain Control(AGC)Less than 10 dB change in audio output for inputs from 10 to100,000 microvolt.Audio frequency responseFrom 300Hz to 2.8kHzAudio Output Power4 watts max @80TRANSMITTEROutput PowerHI:12W LO:1W @13.8V DC FM/AM/CW ModeSSB:25WModulationHigh and low level class BAmplitude Modulation:AMVaried Capacitance Frequency Modulation:FMAudio frequency responseFrom 450Hz to 2.5kHz FM/AM ModeSSB Carrier Suppression55dBUnwanted Sideband50dBInter-modulation DistortionSSB:3rd order,more than-25dB;5th order,more than-35dB