郭小文13530101607深圳汉润电子有限公司MSG-2051isahighperformancesignalgeneratordesignedforgeneratingthesimulationsignalofGPS(GlobalPositioningSystem)satellite.特点■Frequencystabilityofinternalreferenceoscillatorislessthen2×10-8■Rapidchangingoutlevelrangeisfrom-80dBmto-149.9dBm.■Dopplerfrequency(1.57542GHz&plu***n;10kHz)canbedigital-setandcanbeadjustablein0.1Hz.■Areferenceclock(10MHz)input/outputterminalsanda1ppssignalinput/(Outputonoption)terminalsareequippedforexternalsynchronizing.■TheoutputterminalisDC-cuttoabletoconnecttothepoweredantennacable.■AllN***IdatapresetbyGP-IBlineandalsoRS-232C.■AnautomaticZ-countincrementfunctionisequippedsoastosynchronizedwithrealtimeclock.■ThefrontpaneloperationcanbeprogrammedbyGP-IBandRS-232C.*Theapplicationprogramisattached.■DigitalstandardsignalgeneratoradoptingtheDDSmethodOwingtotheadoptionoftheDDSmethod,thisMSG-2280signalgeneratespreciseRFfrequenciesoverawiderangeof100kHzto170MHzinadditiontoAFfrequenciesbyitsbuilt-inAFoscillator.■10mssettlingtimeAdoptingtheDDSmethodensuresahighsettlingspeedoffrequenciesandtheresp***etimeisshorterthan10ms.■100kHzto170MHzwidebandItsfrequencyrangeextendsoverawiderangefrom100kHzto170MHzcoveringtheAMband,FMband,andweatherband.■ElectronicattenuatorItshighlyreliableelectronicattenuatorensuresalong-timecontinuoususe,andtheoutputlevel(-20dBµVto126dBµV)canbeswitchedquicklyandprecisely.■AnFMstereomodulatorisbuilt-inThisunitcomprisesMONO,MAIN,L,R,SUB,andOFFmodulationmodesanditsL/Rseparationexceeds60dB.■Multi-functi***ThisunitcanexecuteAM/FMsimultaneousmodulationfortestingthesuppressiondegreeofmulti-passsignals.ItsoutputAGCandlimitingsensitivitycanbereaddirectlybyitsΔdBfunction.Itcanalsoreadthedetuningfrequency,etc.easilyanddirectlybyitsΔFe-emphasiscanbesettoOFF,25µs,50µs,and75µs.■MemoryfunctionandinterfaceDataof100pointscanbestoredandrecalloutbyitsmemoryfunction.ThisunitisalsoprovidedwithGP-IB,RS-232C,andEXTI/Oexternalcontrolinterfacesasitsstandardequipmentsothatitcanbeconvertedintoanautomaticmeasuringsystem.规格FrequencySectionRange100kHzto170MHzLEDdisplay/Resolution7digits/100Hz(Δffunction)SettlingtimeLessthan10msAccuracy&plu***n;5×10-6OutputSectionOutputRange-20dBµVto126dBµV(EFM)LEDdisplay/Resolution4-digits/0.1dBAccuracy&plu***n;1.5dBLeveling&plu***n;1.5dBOutputimpedance50Ω,VSWR<1.3UnitdBµV[EFM]Spurioussignals•2/3rdHarmonicsprious<-30dB•Non-Harmonicsprious<-40dBAttenuataorElectronicattenuator(Semiconductor)RFleakageWillnoteffectoutputlevelperformancewhen0dBµVisset0dBµModulationSection<FMData>Deviationrange0to135kHzdeviationFo≦35MHz,Upto25%ofcarrierfrequencyLEDdisplay/Resolution3-digit/0.1kHzModulationaccuracy10.7MHz&plu***n;1MHz(76MHzto108MHz)&plu***n;(setting×0.1+0.5)kHz0.3MHzto170MHz&plu***n;(setting×0.1+1)kHzInternalmodulation•Frequency10Hzto100kHz•Accuracy&plu***n;0.1%Ext.modulation•Freq.range20Hzto100kHz•Impedance10kΩunbal•Inputvoltage1Vp-p&plu***n;2%•Distortion≦0.05%in10.7MHz&plu***n;1MHz76MHzto108MHz≦0.1%in0.3MHzto170MHz(WithAF1kHzat75kHzdev.inBW50to20kHzwith50µsde-emphasisapplied)•ResidualFM<-80dB(In,80to20kHzwithde-emphasis50µSapplied)•IncidentalAM≦0.5%(10.7MHz&plu***n;1MHz,76MHzto108MHzwithAF1kHzandFM75kHzdeviation)<AMData>Distortionrange20to15kHzModulationrange0%to100%(lowerthan120dBµV)0%to30%(Higherthan120dBµV)LEDDisplay/Resolution3-digits/0.1%Accuracy&plu***n;(setting×0.1+1)%(0.4MHzto1.7MHz≦80%)&plu***n;(setting×0.1+2)%(0.15MHzto170MHz≦80%)Internalmodulation•Frequency10to20kHz•Accuracy&plu***n;0.1%Ext.modulation•Freq.range20Hzto20kHz(1kHzreference)•Freq.resp***e&plu***n;1dB•Impedance10kΩ(unbal)•InputVoltage1Vp-p&plu***n;2%•DistortionRFFreq.(MHz)Modulation0to30%30.1to60%60.1to80%0.4to1.7≦0.5%≦1.5%≦3.0%0.15to170≦1.5%≦3.0%≦5.0%ResidualAM0.5%(in,80Hzto15kHz)IncidentalFM≦75Hz(0.4MHzto1.7MHz)≦150Hz(0.15MHzto170MHz)FMStereoModulationSeparation≧55dB(WithAF400Hzto1kHzat100%modulationin76MHzto108MHz)≧40dB(With50Hzto15kHz)Frequencyresp***e≦&plu***n;1dB(20Hzto15kHzwithAF1kHzreference)Compositesignal•Output5Vp-p&plu***n;10%(FM-MONO,100%MOD)•Settingrange0to135%(75kHz/100%)•Settingaccuracy&plu***n;1%•Impedance600ΩDistortion≦0.05%(100%MOD.)S/N≧76dB38kHz•Leakage≦-50dBPilotsignal•Frequency19kHz&plu***n;1Hz•Output1Vrms&plu***n;10%(Fixed)•Impedance1kΩ•Settingrange0to15%in0.1stepModulationModeL=R/L/R/L=-R/MONO/OFFIntenalmodulation•Frequencyrange20to15kHz•Frequencyresp***e&plu***n;1dBPre-emphasisSettingrange25µs/50µs/75µs/OFFInterfaceFunctionParallelinterfaceGP-IBcomplyingwithanIEEEstd.488-1975SerialintrefaceRS-232Cntrolinterface(I/O)TTLlevelGeneralDataOperatingTemperaturerange0ºCto+40ºCPerformanceguarantee+10ºCto+35ºCPowerrequirementsAC100to240V&plu***n;10%,50/60Hz,42VADimensi***420(W)×115(H)×370(D)mmWeightApprox.7.5kg)