DreamGEAR MSK 33 manual Const Menu, Colour representation of I/Q value pairs

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Const Menu

The function constellation diagram can be called up in the operation types, SAT (DVB-S), TV (DVB-C and DVB-T), TV-IF or return path (DVB-C). Operating the constellation functions is principally the same in the various operating types. The differences are described below.

Colour representation of I/Q value pairs

The colour representation of the I/Q value pairs should simplify the analysis of the constellation diagram in regards to the occurring error. The colour of the I/Q value pairs changes with the number of hits on one point within the decision field. In an ideal case, the I/Q value pairs are always in the middle of the decision field. However the I/Q value pairs are influenced by interference on the transmission paths or in the modulator on the transmitting side. As long as the I/Q value pairs lie within the decision waves, a clear relation of valence in the receiver can occur. The decision field is subdivided into signal subsurfaces, also called pixels. For a black/white representation, one could not represent the frequency of the hits of a I/Q value pair on the surface of a pixel. The colour representation of the MSK 33 allows the frequency of the hits of a I/Q value pair on the surface of a pixel to be described by the changing of colour. If many I/Q value pairs meet on a pixel, RED is represented, however if very few I/Q value pairs meet on a pixel, blue is represented. Four colours are avail- able for the assessment of the „scores.“

RED – very many hits YELLOW – many hits GREEN – few hits BLUE – very few hits

Constellation diagram for QPSK (DVB-S)

For the digital transmission via satellite, the modulation type QPSK (Quadrature Phase Shift Keying) is used. Every 2 in- formation bits are put together to one symbol and modulate one carrier in its phase. With this, four conditions are pos- sible, which a receiver must recognise.

A crosshair with four clouds, which repre- sent the possible symbols or their fre- quency in the quadrants appear on the colour screen.

Measurement of the bit error rate (BER)

Since it deals with transmission of binary data for DVB-S, the bit error rate can be considered as measurement for the occurred transmission error in the data stream. In the MSK 33, a BER measurement is carried out before the viterbi decoder and displayed on the screen. The bit error rate is the ratio of the number of received de- fected bits divided by the entire number of the received bits. The lowest bit error

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Contents Operating manual 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 113General safety information Explanation of symbolsImportant Notes Validity of this manualSafety Instructions ConnectionsProper use Mechanical loadbearing capacityFunctions FunctionsFunctions overview FunctionReturn path LP DVB-S DVB-S/C/TDisplays, Operating Elements and Connections Front panelMains connection Mains switch DC socket Option / XLR-socket Rear panelHeadphone connection TS parallel Option 10 AUXObserving angle of the on screen display Side view MSKOperating Concept ScreenFrequently recurring softkeys General information for operation Menu selectionMain menu Accu CAP % I=0.00 aPlace of installation of the MSK Mains voltage / mains switchOn/Off switch Safety fuseAccumulator and Battery Operation Accumulator operationDC socket option Connections Measurement Possibilities Level measurementMaximal input level Sat Operation Sat menuSetting of the LNB voltage supply Selecting the LO frequencyEntering the transponder frequency Switch-over of Analog digit. Dvbs Bargraph Level range Comment DisplayIII Calling up menu LNB-CONTROLKHz control signal LNB control menuLNB supply voltage LNB current drawChecking the LNB supply voltage of a satellite receiver Calling up the DiSEqC/V SEC menuDiSEqC DiSEqC menu Submenu for entering DiSEqC commands TX display fieldDisplay field a Display field BExample Entering and transmitting a DiSEqC command Simple DiSEqCData burst Tone burst UFOmicro DiSEqC menu General informationDisplay fields RX 0 E2 10Tx+rx Command 1390Operating the menus ModusSat Operation Sending a V-SEC command TX SEC menuEntering the hex numbers Level-dependent acoustic signal Initial ANALOG-menuCalling up the sound subcarrier MenuSecond Anlaog menu Video polarityAudio carrier setting Setting of the de-emphasisSat subcarrier menu Selecting the subcarrier recepAudio carrier tables for the satellite reception Audio carrier table for reception typeDigital Measurements SAT Digital menu27.500 SR Level measurement Digital Min./Max. levels TV Operation TV menuC10 210.25MHz A65.0dBµV Rf chanTV control menu TV-DiSEqC /VSEC menuLNB U= 0.0 V I= 0 mA Analogue menu Selecting the standardAudio carrier table for TV reception Selecting the audio carriersMeasuring the min./max. level Measuring the current levelSelecting the colour standards PAL, Secam and Ntsc Measuring audio carrier spacingTV Digital menu Selecting demodulation for DVB-C measurementMode DVB-T optional Selecting channel bandwidthsReturn Path if Menu Return path if menuAnalog menu Audio carrier table for if receptionMeasurement 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 levelAV Menu Decoder operationDecoder operation baseband Video input Video outputBreaking voltage RGB operationMpeg transport stream interface TS-Parallel, Lvds optional Mpeg Decoder Menu Optional PAT 083sat KiKa Phoenix Setting Menu UnitOffset 0.0 dB Screen setup Screen MenuSetting the date Setting the time Click buttonSystem Menu Calls up the SYS TEM menuSaving and calling up unit settings Saving the unit settingsCalling up saved settings Copy MenuPrinting out all measurements in TV mode Printing out all measurements in Sat modeMode Menu SpectrText Menu Enlarging the videotextHolding the videotext Original videotext sizeHorizontal zoom -Enlarging the video signal Horizontal zoom Reducing the video signalScope Menu Video scope menuMeasurement of the amplitude of the video signal Measurement of video signals via the AV socket ScartSelecting the video line Audio Scope TimePos Position and triggering of the DiSEqC signal DiSEqC ScopeSaving function Shot ContSpectral Menu Marker SpanMark AnaMarker ana Marker digMeasurement of digital signals in Sat operation Cross-polarisation measurement on signals in SAT operationZoom marker Max offConstellation diagram for Qpsk DVB-S Measurement of the bit error rate BERConst Menu Colour representation of I/Q value pairsMeasurement of signal noise ratio SNR Carrier offsetFrontend locked Selecting the symbol rate symbol-clock Inverting /not inverting a constellation diagramSelecting the code rate Examples for Qpsk constellation diagrams Constellation diagram for QAM DVB-C Measurement of modulation error rate MERInverting /not inverting constellation diagram ZoomExamples for QAM constellation diagram Const Menu Constellation diagram DVB-T optional Measurement of bit error rate BERMeasurement of signal noise ration SNR Carrier modeHierarchy Code rate Guard Invers Frontend locked Channel display Impulse response representation Echo representation optional Broadband Cable Analysis Measuring System MSK Measuring principleTrack MVG10 Upstream measurement Downstream measurementMSK33 MVG10 RGB MSK33Cable system With return path capable amplifiers Auto Measure Display of the check pointInterfaces Modem / RS 232 interfaceConnection cable for modem / RS Setting baud rate Setting local echoSetting hardware handshake Modem/RS232 menuCode Password TTY modeAnsi mode Log-in procedureExample for logging-in in Ansi mode Requesting helpInterfaces List of the command abbreviations Loading and saving predefined settings STUSTU RET LDUMaintenance, Storage and Customer Service Printer paper-exchanging the ribbon Ribbon exchangeOverview of DiSEqC commands Command overview framing byteCommand overview address byte Technical AppendixCommand overview command byte Reset Reset DiSEqC minicontrollerDiSEqC commands for Kathrein matrices Command overview data byteCommand for Kathrein matrix 9xx-series Command for Kathrein matrix EXRChannel tables Channel and frequency table standard B/G frequency in MHzVHF-CCIR UHF-CCIR USB/OSB ESBChannel and frequency table standard Lfrequency in MHz VHF UHFChannel and frequency table standard D/K frequency in MHz VIIViii XIIChannel 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 DTRAssignment of socket TS Parallel optional Unit variants Downloading New MSK33 Operating Software General notes9986498/0206 ZWT Subject to alterations
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