Kathrein 9986492, MSK 33 Measurement of signal noise ratio SNR, Carrier offset, Frontend locked

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Const Menu

rate, which the MSK 33 can measure, is 1.0 e-8. If the rate is lower than these values, the display of the BER jumps to zero „0“ (no longer bit error). The highest BER, which can be displayed, is 1 e-2. Generally, it can be assumed, that picture disturbance can occur by a BER of ca. 1 e-3.

Measurement of signal noise ratio (SNR)

The conception of the MSK 33 allows the S/N ratio of the I- and Q- data stream to be displayed in addition to the C/N measurement on the digital carriers in the Const-menu. The measurement is carried out after the QPSK demodulation and can be called in as an indicator for the noise on the I/Q signals. Differences in the result to the C/N measurement in the spectrum menu can be caused by the com- plex interfering influences of the digital signal or by differences in the input level. The SNR value is displayed on the upper edge of the TFT screen.

The best value, which the MSK 33 can measure, is 12 dB. If the value is better than 12 dB, this is indicated with a arrow in front of the measured value.

Carrier offset

The carrier offset display represents the difference between the set receiving fre- quency on the MSK 33 and the transmitting frequency of the digital signal in MHz. The carrier offset is displayed on the upper edge of the TFT screen.

With the cursor buttons, ◄►, the receiving frequency of the MSK 33 can be changed and the frequency offset can be set to zero. The carrier offset displays, which frequency position the LO of the used LNB has.

Frontend locked

QPSK >

no

If the receiving unit of BACK the MSK 33 is locked on

the carrier frequency of the received signal, the display „frontend locked“ appears on the

screen. „Not locked“, appears in the display, if a representation of the constellation diagram is not possible. An analysis of the constellation diagram or an assessment of the measurement results can first occur, as soon as the receiving signal is locked. The symbol rate and the code rate are to be set here to the required values. The inversion of the spectrum (inverse /no) is automatically set.

The display shows the following values:

-BER = Bit error rate: 1.7 e-06

-SNR = Signal noise ratio: 9.5 dB

-Carrier-Offset: -0,3 MHz

-Frontend locked

-Carrier frequency: 11347.00 MHz

– Digital measurement (D)

– Carrier level: 49.0 dBµV

The last set menu is called up.

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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 100 113 107Explanation of symbols General safety informationImportant Notes Validity of this manualConnections Safety InstructionsProper use Mechanical loadbearing capacityFunctions FunctionsFunction Functions overviewReturn path LP DVB-S DVB-S/C/TFront panel Displays, Operating Elements and ConnectionsRear panel Mains connection Mains switch DC socket Option / XLR-socketHeadphone connection TS parallel Option 10 AUXSide view MSK Observing angle of the on screen displayScreen Operating ConceptFrequently recurring softkeys Menu selection General information for operationMain menu Accu CAP % I=0.00 aMains voltage / mains switch Place of installation of the MSKOn/Off switch Safety fuseAccumulator operation Accumulator and Battery OperationDC socket option Connections Level measurement Measurement PossibilitiesMaximal input level Sat menu Sat OperationSelecting the LO frequency Setting of the LNB voltage supplyEntering the transponder frequency Bargraph Level range Comment Display Switch-over of Analog digit. DvbsIII Calling up menu LNB-CONTROLLNB control menu KHz control signalLNB supply voltage LNB current drawCalling up the DiSEqC/V SEC menu Checking the LNB supply voltage of a satellite receiverDiSEqC DiSEqC menu TX display field Submenu for entering DiSEqC commandsDisplay field a Display field BSimple DiSEqC Example Entering and transmitting a DiSEqC commandData burst Tone burst General information UFOmicro DiSEqC menuDisplay fields RX 0 E2 101390 Tx+rx CommandOperating the menus ModusSat Operation SEC menu Sending a V-SEC command TXEntering the hex numbers Initial ANALOG-menu Level-dependent acoustic signalCalling up the sound subcarrier MenuVideo polarity Second Anlaog menuSetting of the de-emphasis Audio carrier settingSat subcarrier menu Audio carrier frequencyAudio carrier table for reception type Audio carrier tables for the satellite receptionSAT Digital menu Digital Measurements27.500 Level measurement Digital Min./Max. levels TV menu TV OperationC10 210.25MHz A65.0dBµV Rf chanTV-DiSEqC /VSEC menu TV control menuLNB U= 0.0 V I= 0 mA Selecting the standard Analogue menuAudio carrier table for TV reception Selecting the audio carriersMeasuring the current level Measuring the min./max. levelSelecting the colour standards PAL, Secam and Ntsc Measuring audio carrier spacingSelecting demodulation for DVB-C measurement TV Digital menuMode 900 SR1Selecting channel bandwidths DVB-T optionalChBW 8MHz Return path if menu Return Path if MenuAudio carrier table for if reception Analog menuMeasurement of the audio carrier spacing Measurement of the min./max. levelMeasurement of the current level Entering symbol rate QAM64 modeIf RP Digital Menu Radio menu Radio OperationRadio Analog menu Measuring the min/max level FM Measure ALLDecoder operation AV MenuDecoder operation baseband Video input Video outputRGB operation Breaking voltageMpeg transport stream interface TS-Parallel, Lvds optional PAT 08 Mpeg Decoder Menu Optional3sat KiKa Phoenix Unit dBmV Setting MenuOffset 0.0 dB Screen Menu Screen setupSetting the time Click button Setting the dateSystem Menu Calls up the SYS TEM menuSaving the unit settings Saving and calling up unit settingsCalling up saved settings Copy MenuPrinting out all measurements in Sat mode Printing out all measurements in TV modeSpectr Mode MenuEnlarging the videotext Text MenuHolding the videotext Original videotext sizeHorizontal zoom -Enlarging the video signal Horizontal zoom Reducing the video signalScope Menu Video scope menuMeasurement of video signals via the AV socket Scart Measurement of the amplitude of the video signalSelecting the video line Time Audio ScopePos DiSEqC Scope Position and triggering of the DiSEqC signalSaving function Shot ContMarker Span Large ¡ mark ßlevel Spectral MenuAna MaxMarker Dig Marker AnaCross-polarisation measurement on signals in SAT operation Measurement of digital signals in Sat operationZoom marker Max off Measurement of the bit error rate BER Constellation diagram for Qpsk DVB-SConst Menu Colour representation of I/Q value pairsCarrier offset Measurement of signal noise ratio SNRFrontend locked Inverting /not inverting a constellation diagram Selecting the symbol rate symbol-clock27.500 SR Selecting the code rateExamples for Qpsk constellation diagrams Measurement of modulation error rate MER Constellation diagram for QAM DVB-CZoom Inverting /not inverting constellation diagramExamples for QAM constellation diagram Const Menu Measurement of bit error rate BER Constellation diagram DVB-T optionalMeasurement of signal noise ration SNR Carrier modeHierarchy Code rate Guard Invers Frontend locked Channel display Impulse response representation Echo representation optional Measuring principle Broadband Cable Analysis Measuring System MSKTrack MVG10 Downstream measurement Upstream measurementMSK33 MVG10 RGB MSK33Cable system With return path capable amplifiers Display of the check point Auto MeasureModem / RS 232 interface InterfacesConnection cable for modem / RS Setting local echo Setting baud rateSetting hardware handshake Modem/RS232 menuTTY mode Code PasswordAnsi mode Log-in procedureRequesting help Example for logging-in in Ansi modeInterfaces List of the command abbreviations STU Loading and saving predefined settingsSTU RET LDUMaintenance, Storage and Customer Service Before opening the unit, disconnect the supply voltage Printer paper-exchanging the ribbonRibbon exchange Command overview framing byte Overview of DiSEqC commandsCommand overview address byte Technical AppendixReset Reset DiSEqC minicontroller Command overview command byteCommand overview data byte DiSEqC commands for Kathrein matricesCommand for Kathrein matrix 9xx-series Command for Kathrein matrix EXRChannel and frequency table standard B/G frequency in MHz Channel tablesVHF-CCIR UHF-CCIR USB/OSB ESBVHF UHF Channel and frequency table standard Lfrequency in MHzVII Channel and frequency table standard D/K frequency in MHzViii 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 Qpsk BER SNRMER Scope of delivery AccessoriesAssignment of the Scart socket TXD RXD RTS CTS DSR GND DCD DTR Assignment of RS232 socketAssignment of socket TS Parallel optional Unit variants General notes Downloading New MSK33 Operating Software114 115
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