Examples for QAM constellation diagram | Kathrein MSK 33, 9986492

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Examples for QAM constellation diagram

The following examples show possible errors and their representation in the constellation diagram.

64 QAM signal without faults	64 QAM signal with intermodulation of narrow
	band noise

64 QAM signal with low broadband noise. Possible cause: Bad amplifier or to small of

input level on an amplifier in the transmission line.

64 QAM signal with strong broadband noise. Possible cause: cable loss is to high or amplifier has a defect.

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Image 78

Kathrein MSK 33, 9986492 manual Examples for QAM constellation diagram

Contents

Sat/TV/FM Test Receiver MSK Page Preface Contents Checking the LNB supply voltage of a satellite receiver Selecting the colour standards PAL, Secam and Ntsc Mpeg transport stream interface TS-Parallel, Lvds optional Measuring an audio signal via the AV socket Scart Measurement of analogue signals in Sat operation 100 107 113 Important Notes General safety informationExplanation of symbols Validity of this manual Proper use Safety InstructionsConnections Mechanical loadbearing capacity Functions Functions Return path LP Functions overviewFunction DVB-S DVB-S/C/T Displays, Operating Elements and Connections Front panel Headphone connection Mains connection Mains switch DC socket Option / XLR-socketRear panel TS parallel Option 10 AUX Observing angle of the on screen display Side view MSK Operating Concept ScreenFrequently recurring softkeys Main menu General information for operationMenu selection Accu CAP % I=0.00 a On/Off switch Place of installation of the MSKMains voltage / mains switch Safety fuse Accumulator and Battery Operation Accumulator operationDC socket option Connections Measurement Possibilities Level measurementMaximal input level Sat Operation Sat menu Setting of the LNB voltage supply Selecting the LO frequencyEntering the transponder frequency III Switch-over of Analog digit. DvbsBargraph Level range Comment Display Calling up menu LNB-CONTROL LNB supply voltage KHz control signalLNB control menu LNB current draw Checking the LNB supply voltage of a satellite receiver Calling up the DiSEqC/V SEC menuDiSEqC DiSEqC menu Display field a Submenu for entering DiSEqC commandsTX display field Display field B Example Entering and transmitting a DiSEqC command Simple DiSEqCData burst Tone burst Display fields UFOmicro DiSEqC menuGeneral information RX 0 E2 10 Operating the menus Tx+rx Command1390 Modus Sat Operation Sending a V-SEC command TX SEC menuEntering the hex numbers Calling up the sound subcarrier Level-dependent acoustic signalInitial ANALOG-menu Menu Second Anlaog menu Video polarity Sat subcarrier menu Audio carrier settingSetting of the de-emphasis Audio carrier frequency Audio carrier tables for the satellite reception Audio carrier table for reception type Digital Measurements SAT Digital menu27.500 Level measurement Digital Min./Max. levels C10 210.25MHz A65.0dBµV TV OperationTV menu Rf chan TV control menu TV-DiSEqC /VSEC menuLNB U= 0.0 V I= 0 mA Audio carrier table for TV reception Analogue menuSelecting the standard Selecting the audio carriers Selecting the colour standards PAL, Secam and Ntsc Measuring the min./max. levelMeasuring the current level Measuring audio carrier spacing Mode TV Digital menuSelecting demodulation for DVB-C measurement 900 SR1 DVB-T optional Selecting channel bandwidthsChBW 8MHz Return Path if Menu Return path if menu Analog menu Audio carrier table for if reception Measurement of the min./max. level Measurement of the audio carrier spacingMeasurement of the current level QAM64 mode Entering symbol rateIf RP Digital Menu Radio Operation Radio menuRadio Analog menu FM Measure ALL Measuring the min/max level Decoder operation baseband Video input AV MenuDecoder operation Video output Breaking voltage RGB operationMpeg transport stream interface TS-Parallel, Lvds optional Mpeg Decoder Menu Optional PAT 083sat KiKa Phoenix Setting Menu Unit dBmVOffset 0.0 dB Screen setup Screen Menu System Menu Setting the dateSetting the time Click button Calls up the SYS TEM menu Calling up saved settings Saving and calling up unit settingsSaving the unit settings Copy Menu Printing out all measurements in TV mode Printing out all measurements in Sat mode Mode Menu Spectr Holding the videotext Text MenuEnlarging the videotext Original videotext size Scope Menu Horizontal zoom Reducing the video signalHorizontal zoom -Enlarging the video signal Video scope menu Measurement of the amplitude of the video signal Measurement of video signals via the AV socket ScartSelecting the video line Audio Scope TimePos Saving function Position and triggering of the DiSEqC signalDiSEqC Scope Shot Cont Ana Spectral MenuMarker Span Large ¡ mark ßlevel Max Marker Ana Marker Dig Measurement of digital signals in Sat operation Cross-polarisation measurement on signals in SAT operationZoom marker Max off Const Menu Constellation diagram for Qpsk DVB-SMeasurement of the bit error rate BER Colour representation of I/Q value pairs Measurement of signal noise ratio SNR Carrier offsetFrontend locked 27.500 SR Selecting the symbol rate symbol-clockInverting /not inverting a constellation diagram Selecting the code rate Examples for Qpsk constellation diagrams Constellation diagram for QAM DVB-C Measurement of modulation error rate MER Inverting /not inverting constellation diagram Zoom Examples for QAM constellation diagram Const Menu Measurement of signal noise ration SNR Constellation diagram DVB-T optionalMeasurement of bit error rate BER Carrier mode Hierarchy Code rate Guard Invers Frontend locked Channel display Impulse response representation Echo representation optional Broadband Cable Analysis Measuring System MSK Measuring principle Track MVG10 MSK33 MVG10 Upstream measurementDownstream measurement RGB MSK33 Cable system With return path capable amplifiers Auto Measure Display of the check point Interfaces Modem / RS 232 interfaceConnection cable for modem / RS Setting hardware handshake Setting baud rateSetting local echo Modem/RS232 menu Ansi mode Code PasswordTTY mode Log-in procedure Example for logging-in in Ansi mode Requesting help Interfaces List of the command abbreviations STU RET Loading and saving predefined settingsSTU LDU Maintenance, Storage and Customer Service Printer paper-exchanging the ribbon Before opening the unit, disconnect the supply voltageRibbon exchange Command overview address byte Overview of DiSEqC commandsCommand overview framing byte Technical Appendix Command overview command byte Reset Reset DiSEqC minicontroller Command for Kathrein matrix 9xx-series DiSEqC commands for Kathrein matricesCommand overview data byte Command for Kathrein matrix EXR VHF-CCIR UHF-CCIR Channel tablesChannel and frequency table standard B/G frequency in MHz USB/OSB ESB Channel and frequency table standard Lfrequency in MHz VHF UHF Viii Channel and frequency table standard D/K frequency in MHzVII XII Channel and frequency table standard I frequency in MHz Channel and frequency table standard M/N frequency in MHz Channel and frequency table standard M/Nfrequency in MHz Technical Data Technical dataPower supply SNR Qpsk BERMER Accessories Scope of deliveryAssignment of the Scart socket Assignment of RS232 socket TXD RXD RTS CTS DSR GND DCD DTR Assignment of socket TS Parallel optional Unit variants Downloading New MSK33 Operating Software General notes 114 115