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Agilent Technologies 8935 series e6380a manual Carrier Feedthrough

Models: 8935 series e6380a

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CDMA Measurements - Screens and Control Fields

CDMA Measurements

Figure 5-2

Time Offset

Carrier Feedthrough

Carrier feedthrough is displayed when the Rho measurement is selected. Carrier feedthrough is a common cause of bad rho measurements. Carrier feedthrough is a result of RF carrier signal feeding through the I/Q modulator and getting on the output circuitry without getting modulated. A good carrier feedthrough level is lower than − 25 dB (such as − 29 dB).

As shown in the diagram, a perfect constellation is offset by the magnitude of the carrier feedthrough. In the frequency domain, carrier feedthrough can show up as an uncorrelated energy spike that can be seen on the spectrum analyzer by closely scanning the top of the trace. The effects of carrier feedthrough can also show up as higher noise levels on the CODE DOM screen. The inactive Walsh codes will be pushing the − 27 dB specification for noise. Carrier feedthrough can be caused by the lack of isolation across the mixer and cavity of the transmitter's I/Q modulator. Shielding can help reduce carrier feedthrough.

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Chapter 5

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Agilent Technologies 8935 series e6380a manual Carrier Feedthrough

Contents

Revision F January Agilent Part Number E6380-90019Page Contents Overview of the Test Set’s Built-In Tools Cdma Measurements Screens and Control Fields Analog Measurements Screens and Control Fields Contents Contents Control Fields on the Configuration Screens 227 Configuration Screens and Control FieldsAMPS-TACS, NAMPS-NTACS Encoder and Decoder 253 Signaling Encoder and Decoder Screens and Control FieldsConnectors ConnectorsError Messages Accessories, Manuals, SupportGeneral Information Herstellerbescheinigung Manufacturers DeclarationSafety Considerations Adjustments described in the manual are performed with Connected to the earth terminal of the power sourceInstrument must be made inoperative and be secured against Any unintended operationProtective earthing ground incorporated in the power cord This product is a Safety Class I instrument provided with aMains plug shall only be inserted in a socket outlet Provided with a protective earth contact. Any interruptionConsumables Lifting and HandlingProduct Markings Certification Declaration of Conformity Like-new Defects in material and workmanship when properly installedIts programming instructions due to such defects Price upon prompt return of the productChapter Assistance Regional Sales and Service Office sPower Cables Power CablesStraight/90 8120-1692 Inches, mint gray Used in the following locations Peru Used in the following locations Switzerland Straight/90 8120-4754 Inches, dark gray JIS C 8303, 10090 /Straight 8120-1351 Inches, mint gray LineNeutral Straight/90 Used in the following locations System Cabinets 8120-4379 Inches, jade grayPower Cables Product Description Sinad SNR Documentation What is in This ManualConventions Used in This Manual Document Navigation Which Document is Required?Document Part Number Usage Trademark Acknowledgments Getting Started Before Connecting a Radio on Before Connecting a Radio Changing the Test Set’s Display Using the cursor-control Knob or Screen KeysTo change the measurement screen Unit-of-Measure Field Changing the Control FieldsTo change a unit-of-measure field To Change an underlined entry Underlined Entry FieldTo make a one-of-many choice One-of-Many FieldNumeric-Entry Field Numeric-Entry FieldsTo change a value Hexadecimal Values Decimal ValuesHow do I Verify that the Test Set is Operating Properly? Cdma Spectrum Operating Overview Operating Overview ADC Full Scale ADC FS Displaying Cdma MeasurementsMagnitude Error, Phase Error Selecting Code Domain Measurements DiagramTransmitter TXPower Frequency Error, FrequencyDisplaying Analog Measurements RF MeasurementsDisplaying AF Measurements Measurement AF Anl In SettingFM Deviation, AM Depth, AC Level SINAD, Distortion, SNR, AF Frequency, DC LevelDisplaying SINAD, Distortion, SNR, DC Level, or AF Frequency To display the meter scale Displaying Measurement Results on a Meter ScaleTo set the meter’s end points and scale intervals Operating Overview Calibrating the Channel Power Measurement Cdma Analyzer Calibrating the Channel Power Measurement Code Domain Calibrating the Adjacent Channel Power ACP Measurement Using the Factor of 10 Increment/Decrement Keys Changing the Increment or Decrement SettingSpecifying An Increment Value for the Arrow Keys or Knob To reset or remove limits Using Measurement Limit IndicatorsTo set high and low limits To remove a limit To set a reference Setting a Measurement ReferenceTo use measurement averaging Averaging MeasurementsHow the Test Set Averages Measurements To set an RF Offset Setting an RF Generator/Analyzer OffsetTo save an instrument setup Saving and Recalling Instrument SetupsTo recall an instrument setup Press RecallTo remove clear an individual save register Poweron SettingsTo clear all save registers Register NamesMemory Considerations Base SettingsInstrument Hardware Changes Using Pre-Defined User Keys Using User KeysTo assign local user keys Assigning and Releasing User KeysTo release local user keys To assign global user keysReplacing Batteries Overview of the Test Set’s Overview of theTest Set’s Built-In Tools Using the RF Tools Program Software Menu Screen Loading and Running RF ToolsTest Results/BTS Utility Setup Screens Test Results/BTS Utility SetupTo use a printer for data collection To use a laptop interface other than the BTS Laptop Utility Swept GainMeasurement Description Making the MeasurementSelecting the Swept Gain Measurement Test Level for the Duplex OUT level in dBm parameter Level value to avoid damage to that devicePress k1 Begin Tst Example of a Swept Gain Plot Screen Discrete Frequency Insertion Loss SpecificationsParticular test Press k1 Proceed when you are finished with this screen.Second display is enlarged for easier reading 10 Selecting the Swept Insertion Loss Measurement Swept Insertion Loss11 Swept Insertion Loss Setups Estimating Swept Insertion Loss Using a Single Connection Swept Return Loss Select Main Menu Swept Return Loss 13 Swept Return Loss Setups Power level. To avoid damage to the ANT in port, enter an14 Example of a Swept Return Loss Plot Screen Specifications Test Signal Can Cause Interference Cable FaultTime domain can be used to find the physical distances. Locations by viewing it in units of distanceSelect Main Menu Cable Fault Measurement Cable length, enter a value 1.5 times the estimated length Greatest accuracy is obtained when you enter a cable lengthToggles the selection between feet and meters K1 HELIAX, k3 RG, or k5 Custom17 Cable Fault Setups 18 Example of a Cable Fault Plot Screen Cable Fault Performance Typical cable fault return loss measurementsReplot Data Files Select Main Menu 21 Transfer Stored Data Screen Transfer Stored Data22 SA Self Calibration OFF/ON Screen SA Spectrum Analyzer Self Calibration ON/OFFCatalog PC Memory Card 23 Catalog Memory Card Screen Selecting the Code Domain Analyzer’s Controls Menus Using the Code Domain Analyzer24 Code Domain Analyzer Menus IS-95 25 Code Domain Analyzer Menus IS-2000 Setting Resolution Bandwidth and Sweep Rate Using the Spectrum AnalyzerRelationship between Span, Resolution Bandwidth, and Sweep Automatic Calibration26 Spectrum Analyzer Controls Menus Selecting the Spectrum Analyzer’s Controls MenusDelta Frequency Using the Spectrum Analyzer’s Delta MarkersDelta Level Reference Marker Ref Mrkr Level and Frequency Displaying the Spectrum Analyzer Mask Using the Spectrum Analyzer MaskDefining the Fixed Mask’s Limits Settings for mask in FigurePoint Point Level FrequencyTurning Off the Mask Defining the Relative Mask’s LimitsTurning Off the Mask’s Failure Beeper Set to Audio Using the Voltmeter and Audio Frequency CounterMeasuring AC and DC Voltages AC Level Set to DC Level or AF Freq Set to match source29 Inputs and Filters for the Oscilloscope Using the Oscilloscope ScopeSelecting the Oscilloscope’s Input Selecting the Oscilloscope’s Filters Using the Oscilloscope’s MarkerTriggering the Oscilloscope Copypl Using Ibutil ProgramsSecuring aTest Procedure Clearing RAM Using the Listopts list options Program Using the Demo Program Step Using the Stplt store or plot ProgramCdma Measurements Screens and Control Fields 130 Cdma Measurements Average Power MeasurementsAvg Pwr Screens on which this measurement is displayedChannel Power Measurements Adjacent Channel Power MeasurementsScreens on which this measurement is made Chan PwrRho Rho MeasurementsEstimated Rho Est Rho Frequency Error Freq ErrCode DOM Code Domain Analyzer Time Offset Carrier Feedthrough Chapter 137 Magnitude Error Error Vector Magnitude EVM MeasurementsPhase Error Code Domain Measurements IS-95 Code Domain Power, IS-95Code DOM Code Domain Analyzer, IS-95 only Selecting Absolute or Relative Code Domain Power, IS-95 onlyCode Domain Phase Phse Fast PowerCode Domain Timing Timing Code Domain Measurements IS-2000 Advantages of Using IS-2000Interpreting IS-2000 Channel Ordering Building a tree using the Bit Reverse methodChannel numbers. The Walsh index utilizes Walsh orders 0 Available Measurements in the Code Domain 11 Code Domain Power, Bit Reverse OrderingReading Code Domain Power, IS-2000 Code Domain Power, IS-2000Code DOM Code Domain Analyzer, IS-2000 Code Domain Power & NoiseCode Domain Fast Power Synchronize Code Domain Complex PowerPN Offset Search IQ Constellation Diagram, IS-2000 only# of Frames Control Fields for Cdma MeasurementsACP Cal ACP Fltr BWADCfs or ADC FS ACP OffsetAmplitude Code DOM Code Domain Analyze screen gain controls menuAnalyzer code domain analyzer Analyzer Cdma analyzerAnl Dir COD DOM Code Domain Analyzer main controls menuAuto Zero Anl SpecialCarrier FT or Carrier Feedthru Chan NumCD pwr unit Chan SizeChn Pwr Cal CW RF Path ControlsCOD DOM Code Domain Analyzer all menus Data Rate Data Source Find PN Even SecFreq Err Gen Dir GainCOD DOM Code Domain Analyzer gain controls menu Gen Special Gen ModeInput Port Input AttenLvl Code DOM Code Domain Analyzer gain controls menuMarker Lvl Power LevelMarker Pos Meas Intvl or Meas IntMeas Order COD DOM Code Domain Analyzer fast power setup controls menuMeasurement Num AvgsCOD DOM Code Domain Analyzer FP setup controls menu Phase/divOfs Trnsfer Output PortPN Incrment PhsePN Offset Pwr Gain PN Offset or PN OfsPwr Ref Pwr IntvlPwr Scale IS-95 Pwr Scale IS-2000Qual Event Pwr ZeroRate RC-4 Rate RC-3Rate RC-5 Code DOM Code Domain Analyzer trigger controls menuRF Gen Freq RF ChannelRF In/Ant Screens on which this field is displayedStart Frame Sprd Fact Spread FactorThreshold Time/div TimeTime Ofs Time OffsetTune Freq Trig EventWalsh Order Walsh ChanControl Fields 178 AC Control Analog MeasurementsAM Depth Measurement DC Level Measurement AF Freq MeasurementFM Deviation Measurement Distn Distortion MeasurementFrequency Measurement Frequency Error MeasurementTX Power Measurement Sinad Measurement Is signal to noise ratio of the audio input signalSNR Measurement Control Fields for Analog Measurements Signaling Decoder All Modes#Pts AF AnlAFGen1 Freq AF Cnt GateAFGen2 Freq AFGen1 ToAFGen2 To Signaling Encoder All ModesSpec ANL RF generator controls menu Atten HoldAudio Out Audio In LoAuto/Norm Scope trigger controls menuSpec ANL all menus except mask controls Center FreqSpec ANL main controls menu DC FM Zero Cont/SingleDe-Emp Gain De-EmphasisDisplay DetectorDetector Types EditPt Edit MaskExt TTL Ext Load RFilter FM Coupling Freq mask Freq Delta MrkrReference Marker Frequency Level Delta Marker Freq normal marker Spec ANL all menus when in normal mode except mask controlsFreq Ref Mrkr Normal Marker Frequency LevelIf Filter Gain CntlSpec ANL auxiliary controls menu Input GainInternal Level mask Level divLvl Delta Mrkr Lvl normal marker Lvl markerScope all control menus Marker To Peak+ Lvl Ref MrkrMarker To Peak Scope marker controls menuMask Beep Marker ToMask Type Spec ANL marker controls menuNo Pk/Avg Mod In ToNorm/Delta NormalizeNotch Gain Notch FreqOffset Freq Pk Det To Position Port/SweepScope marker controls menu Spec ANL marker controls menu Ref Level Pos/NegRef Mrkr RF Cnt Gate ResetSpec ANL RF generator or main controls menu Key or turn the Test Set off and on to reset it Maximum signal levels are printed on the connector panelSpec ANL RF Gen controls menu This field selects the input port for the spectrum analyzerSensitivity RF analyzer Scope ToSettling Sensitivity spectrum analyzerSpeaker ALC SpanSpeaker Vol Sets the span of frequencies to be displayed on the screenSquelch This field selects the horizontal sweep time per division Track/FixedTime-per-division is selected from a list of choices Scope main controls menuResolution Trig-DelayTX Pwr Meas Vert/div TX Pwr ZeroVert Offset Configuration Screens 224 Setting the Date and Time Configuring the InstrumentChanging the Beeper’s Volume Turning Off User MessagesPrinting a Screen Configuring for Printing a ScreenTo interrupt printing Screens Where Field is Present Control Fields on the Configuration ScreensAbort Print AntennaBeeper Base Freq User DefinedChan Space User Defined CallCdma Std 230 Connection Time-out Command Escape CharacterData Length Display User Messages DateDuplex Out FF at End Ext RefFF at Start FirmwareOUT connector InaccessibleFlow Control Frame Clock OutputGen-Anl User Defined Gen-AnlGpib Adrs Hold-off DelayIbasic Echo Inst Echo Incoming Call SecurityLines/Page ModeModel Modem ConfigurationModem Mode Modem Initialization/ConfigurationNumber to Call Notch CouplOpt Cdma TB ParityPrinter Adrs PasswordPrinter Port Print TitleRange Hold Ref Select Remote ModeRF Chan Std RetriesRF Gen Volts RF DisplaySee the RF Chan Std on page 244 for more information RF Level Offset RF In/OutSave/Recall RF OffsetSerial9 Serial BaudSerial No This field displays the serial number of the Test SetStatus Serial PortStop Length Total RAM Signaling Encoder and Decoder Decoder’s Signal Source Signaling Encoder and Decoder ScreensDecoder Frequency Measurements EncoderControl and Voice Channel Identifiers AMPS-TACS, NAMPS-NTACS Encoder and DecoderEncoder/Decoder Interaction AMPS-TACS, NAMPS-NTACS Decoder Decoder Mode DifferencesInterpreting Decoded Data Recc and AMPS-TACS RVC MeasurementsDecoding the Reverse Control Channel Recc Data Measure Field NAMPS-NTACS Reverse Voice Channel MeasurementsDecoding NAMPS-NTACS Reverse Voice Channel RVC Data Measurement Limits Dtmf Sequence Encoder and DecoderDecoding Considerations Function Generator Encoder and DecoderDelay Control Fields for the Signaling Encoder and DecoderArm Meas BurstsBusy/Idle Signaling Decoder Modes AMPS-TACS, NAMP-NTACChannel Data hexSignaling Encoder Signaling DecoderData Level Data Rate analogSignaling Decoder Modes NAMP-NTAC Signaling Encoder Modes NAMP-NTACDSAT/DST hex Data you enter here Filler FoccGate Time FrequencyHi Tone De-emphasis Effects on Input Level Input LevelSignaling Decoder All Modes Examples of Input Level SettingsLo Tone MeasureAMPS-TACS/NAMPS-NTACS Focc Message and Filler Data Format Message FoccMessage FVC AMPS-TACS Signaling Encoder Modes AMPS-TACSMessage/DST FVC Message FVC NAMPS-TACSSignaling Encoder Modes Dtmf Signaling Decoder Modes Dtmf Signaling Decoder All Modes Signaling Encoder All ModesNum of Bits Off TimePolarity On TimeNormal Operation Inverted OperationPre-Emp Signaling Encoder Modes DtmfRecc Data hex SAT Freq FVCSend Dsat FVC SendSend Filler Focc Signaling Encoder Modes Func Gen Send ModeSine Units Single/ContStop StandardDecoder Operating Considerations Encoder Operating ConsiderationsStop Dsat FVC Symbol Frequencies HzStop Filler Focc Stop MeasTrigger Pattern bin Signaling Decoder Modes AMPS-TACS, NAMP-NTAC, Func GenTrig Level Twist and Pre-emphasis Interaction TwistExamples of Twist and Pre-emphasis Interaction ExampleWaveform Connectors Operating Considerations ConnectorsANT Audio Audio OUT Data EXT REF EXT Scope Trig Parallel Port Pin Assignments ParallelRF IN/OUT Serial Port Pin Assignments Serial 9, 10,Serial Port Pin Assignments Pin DescriptionVideo OUT Accessories, Manuals, Support Modifications Accessories Agilent Technologies AccessoriesExternal Monitor Agilent Technologies Manuals English and OtherOptions Agilent Technologies Test SoftwareNumber Description Order Description Number 1D5 High Stability ReferenceGetting Help Support for Your InstrumentCustomer Training Agilent Regional Sales and Service Offices Error Messages Positive Numbered Error Messages General Information About Error MessagesExample 11-1 Positive numbered error messages take the form Example 11-2 For exampleIbasic Error Messages Negative Numbered Error MessagesExample 11-4 Ibasic error messages take the form Example 11-3 For exampleText Only Error Messages Gpib Error MessagesExample Gpib error messages take the form Example Text only error messages take the formMessage Display Non-Recoverable Firmware ErrorWarbles and Beeps 304 Chapter 305 306 Index 308 Index 309 310 Index 311 312 Index 313 314 Index 315 316 Index 317 318 Index 319 320 Index 321 322 Index 323 324