EM550-en说明书

Version01.00June2006VHF/UHFDigitalWidebandReceiver¸EM550EfficientandversatilesolutionforradiomonitoringapplicationsDatasheetTheR&S®EM550isafullydigitizedVHF/UHFreceiverofadvanceddesignbasedonstate-of-the-arttechnology.Itcoversthefrequencyrange20MHzto3.6GHz.ExcellentRFcharacteristicsanddynamicperformancepairedwithpowerfuldigitalsignalprocessingarethebasisforopti-mumsystemsolutions.WidebandoperationI/Qdataupto10MHzbandwidthDemodulationupto10MHzband-widthIFanalogoutputupto50MHzbandwidthAnalogTV,radar23IFfilters,150Hzto10MHzPanoramascanupto16GHz/sor600000channels/sFrequency/memoryscanupto850channels/s◆––––◆◆◆IFpanoramaupto9.6MHzspanVideopanorama,AM,FM,AM2,FM2,I/QAudiofilter:notch,noisereduction,bandpassTwo-channelanalogvideooutput:AM,FMorI,QITUmeasurementsSelectivecalldecodingLANinterface(SCPI)◆◆◆◆◆◆◆2VHF/UHFDigitalWidebandReceiver¸EM550OverviewTheVHF/UHFDigitalWidebandReceiverR&S®EM550isideallysuitedformilitarymonitoringtasksandspectrummonitor-inginlinewithITUrecommendationsaswellasforradioinvestigationservices.The¸EM550ispreparedtomeetanyfuturedemandsinthefieldofre-ceiverandanalyzertechnologyforthepurposeoffrequencyspectrumandsig-nalanalysis.Thereceiverissoftware-compatiblewiththe¸EB200/ESMBfamily,thusprovidinganeasywaytoup-gradeexistingradiomonitoringsystems.DescriptionThe¸EM550coversthewidefre-quencyrangefrom20MHzto3.6GHz.Highlevelmixersandamplifiersmakesurethatevenincriticalscenariostheintermodulationproductsareextremelylow.Additionallythereceiverfeaturescomprehensivepreselectiontoreducethesignalsumloadontheinput.Localoscillatorswithlowphasenoisearethebasisforoptimumdetectionofweaksig-nalsintheclosevicinityofstrongemit-ters.AlargenumberofIFbandwidthsisavail-abletoprocessthevarioussignalswithoptimumsignal-to-noiseratio.Toensuremaximumquality,moderndigitalsignalprocessingisusedthroughout.ThereceiverisequippedwithdigitalIFfilterswith23differentbandwidthset-tingsfrom150Hzto10MHz.Demodu-lationwithanaloganddigitalvideodataaswellasdigitalbasebanddatacanbeperformedoverthiswiderangeofIFfil-ters.Manyinterfaces,bothdigitalandana-log,providenearlyunlimitedprocessingofthegaineddata.OperationThereceiveriscontrolledviatheLANin-terface(TCP/IP)basedontheSCPIsyn-tax.Thereceiveroperatesinthefollowingmodes:Fixedfrequencymode(FFM)MemoryscanFrequencyscanPanoramascan(option)WidebandFFMTestDataoutputispossibleinthefollowingformats:IF22widebandanalog,f=405.4MHz,BW≥50MHzIF33analog,f=21.4MHz,BW≥8MHzBasebandsignal(IandQ)indigitalformviaLAN(BWmax=1MHz)FPDP(BWmax=10MHz)Videoanalog,DCto½BW,twochannels(AM/FMorI/Q)orIFana-log,gain-controlled,variablecenterfrequency0MHzto21.4MHz,twochannelsVideodigitalviaLAN,twochannels,AM/FM(BWmax=250kHz)orI/Q(BWmax=500kHz)AES3forrecordingaudiodataAudiodigitalviaLANAudioanalog(600Ωlineandhead-phones)◆◆◆◆◆◆◆◆◆––◆◆◆◆◆OperatingmodesInthefixedfrequencymode,afixedfrequencychannelissetatwhichthesignalisreceived,filteredanddemodu-lated.Thefollowingparameterscanbeset:FrequencySettingrangefrom20MHzto3.6GHzin1HzstepsDemodulationmodeThefollowingdemodulationmodescanbeselected:FMAMPULSE(AMPULSE)PMUSBLSBISBCWI/QTVBandwidthTheIFbandwidthscanbeselectedin23stepsbetween150Hzand10MHzMeasurementtimeAutomaticorsettablebetween0.5msto900sDetectormodes“continuous”or“periodic”SquelchThelevelsquelchcanbesetin1dBstepsintherange–30dBµVto+130dBµVAutomaticfrequencycontrol(AFC)WithAFCswitchedon,thereceiverfrequencyistunedwithintheIFbandwidthLeveldetectorForlevelmeasurement,thedetectorcanbeswitchedtoAVG,PEAK,RMSorFASTFrequencyoffsetdetectorAttenuatorManual(0dBto40dB)orautomaticmode◆◆––––––––––◆◆◆◆◆◆◆◆VHF/UHFDigitalWidebandReceiver¸EM5503Gaincontrol(GC)Automatic(AGC)andmanual(MGC)gaincontrol;theMGCsettingcoverstheinputsignalrangefrom–30dBµVto+130dBµVVideopanoramaSpectrumofthedemodulatedsig-nalwithanalysisfeatures(squaredAM,FM)IFpanorama(option)Spanrange10kHzto9.6MHzITUmeasurement(option)AMmodulationindex(AM+,AM–,AM)FMdeviation(FM+,FM–,FM)PMdeviation(0πto4π)Bandwidth(0MHzto9.6MHz)IntheMemoryScanmode,thereceiversettingscanbeprogrammedforthemon-itoringofupto10000channels.ThesechannelscanbescannedwiththeMem-oryScancommand.AsinglechannelcanbecalledwiththeRecallcommand.Thesquelchlevelservesasacriterionfordwellingatthesamefrequencyorswitchingtothenextchannel.Ifthelev-elcriterionismet,thereceiverallowstheselectabledwelltimetoelapseandthenswitchestothenextchannel.Thefollowingparametersareselectableforeachchannel:MemorylocationstatusFrequencyDemodulationmodeBandwidthAttenuatorAFCsettingsSquelchparametersAntennanumberTheContinuecommandcanbeusedtoswitchtothenextchannelbeforethedwelltimehaselapsed.IntheFrequencyScanmode,startfre-quency,stopfrequency,andfrequencysteparedefinedformonitoringaspecific◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆frequencyrange.ThisfrequencyrangecanbescannedwiththeFrequencyScancommand.Thesquelchlevelservesasacriterionfordwellingatthesamefrequencyorswitchingtothenextfrequency.Ifthelevelcriterionismet,thereceiverallowstheselectabledwelltimetoelapseandthenswitchestothenextfrequency.Thedemodulatorsettingsarefixedforthedefinedsearchrange.TheContinuecommandc