Kathrein MSK 125 manual Technical Appendix, SIGNAL-TO-NOISE Ratio, +14.1 dB

Page 71

TECHNICAL APPENDIX

SIGNAL-TO-NOISE RATIO

To determine the carrier-to-noise-ratio (C/N) for analogue transponders, the following values must be known:

•Ambient noise level (adjust parabolic antenna so that no satellite signal is received)

•max. reception signal

•Bandwidth correction

The following formula applies:

C/N = reception signal level - ambient noise level - bandwidth correction

(MSK 125 measurement bandwidth) 6 MHz Bandwidth correction value = 10 log ––––––––––––––––––––––––––––––––––

RF bandwidth reception signal Bandwidth correction value = 6.37 dB for 26 MHz bandwidth (Astra)

Bandwidth correction value = 7.78 dB for 36 MHz (Eutelsat, Intelsat,

Kopernikus)

Example

Reception signal level	+75.5 dB	with satellite signal
Ambient noise level	-55.0 dB	without satellite signal
Carrier-to-noise (C/N) ratio	+20.5 dB
Bandwidth correction	-6.4 dB	for 26 MHz bandwidth
C/N of receiver	+14.1 dB

Note

For exact C/N determination it is essential that the RF bandwidth of the reception signal is considered.

71

Image 71

Contents MSK Validity of this Operating Manual General Safety InstructionsFOREWORD/IMPORTANT Instructions Contents FM Measurement Features Technical Data Technical Appendix Storing Device SettingsMaintenance Customer ServiceProduct Package Safety InstructionsMeaning of Symbols Safety InstructionsFunctionality 8PSK FunctionLED Display Operating and Display ElementsLC Display TFT Colour DisplaySource selection Measurements LC display TFT colour displayInput block Alphanumeric input Overview of Keypad CommandsButton Operating and Display Elements Side View Fan Ear phones Loudspeakers Battery fuse DC supplyConnections Front ViewSD Card External DC Power SupplyRF Input Socket USB PortGetting Started Switch on Switching OFF Setup MenuSetup Menu Settings Mains Operation Mains and Battery OperationDefault Setup Settings AT Time of Shipment Parameter SettingBattery Operation Analogue Satellite Reception SAT ANALOGUE/DVB-S2 SwitchCommand Overview of SAT Frequency Entry SATButton LNB voltage Following voltages can be called up via button commandCommand overview for LNB voltage LNB Voltage and 22 KHZ CHANGE-OVERLevel overﬂow and underﬂow Sound Carrier Frequency SettingSAT Analogue Level Measurement Select Sound Carrier Frequency in MHz BandwidthDigital SAT Reception Following voltages can be Button Called up via button commandCommand overview for LNB voltage SAT DVB-S2 Level Measurement Setting DVB-S2 Demodulation ParametersDiseqctm Digital Satellite Equipment Control Button Hex code Command Overview for DiseqctmSAT-CTRL menu DiSEqCTM menu Hex Byte Description Command Overview for Framing ByteCommand Overview for Address Byte Byte Command Overview for Command ByteHex Command ID Description Switch Read switching status ﬂag commited portOrbit Polarisation Switch Position Data Byte Low Band Command Overview for Data ByteSimple DISEQCTM, Tone Burst List of Single Cable Diseqctm CommandCommand Overview for Simple Diseqctm Press to exit digital reception DVB-S2 MER, BER and Offset MeasurementMpeg Image Representation in DVB-S2 Calling up DVB-S2 measurementLocating Satellites Command overviewFinding Individual Reception Frequencies Command overview for ﬁndingAnalogue TV Cable Reception Analogue CABLE/DVB C SwitchHF Standard Switch Analogue Cable Demod Menu TV MeasurementFrequency Display and Entry Command Overview for TV Channel EntryChannel Display and Entry Cable Analogue Level Measurement Command Overview for TV Frequency EntryStandard Command Overview for Measure TV Audio Carrier FrequencyAudio Carrier Spacing and Level Level Overflow and UnderflowSelect Soundcarrier Digital TV Cable Reception Channel Display and Entry Setting DVB-C Demodulation Parameters To call up DVB-C/DVB-T/H measurement Level Measurement of DVB-C/DVB-T/H SignalsLC display for DVB-C signals DVB-C/DVB-T/H MER, BER and Offset MeasurementMpeg Image Representation in DVB-C Analogue Terrestrial TV Reception Analogue TERRESTRIAL/DVB T/H SwitchHF Standard Switch Terrestrial HF Standard SwitchChannel Display and Entry Command Overview for TV Frequency Entry Digital Terrestrial TV Reception Setting DVB-T/H Demodulation ParametersHF Standard Switch DVB-T Select the required HF bandwidth by using the digit buttonsChannel Display and Entry DVB-C/DVB-T/H MER, BER and Offset Measurement Mpeg Image Representation in DVB-T LC display for DVB-T signalsFinding Individual Reception Frequencies Nicam Audio BIT Error Rate Measurement Level Measurement FM SwitchCommand Overview for FM Frequency Entry FM MeasurementCommand Overview for Find TV Spectrum Spectrum MeasurementSAT Spectrum Spectrum Measurement FM Spectrum TFT display LC display Storing Device SettingsStoring Device Settings Deleting Device SettingsTFT display Storing Measurement ResultsStoring Measurement Results in the Device Memory Spectrum Memory Full Only 10 Spec. PossibleStoring Measurement Results on the SD Card Deleting Measurement Results from the Device MemoryStoring Measurement Results Entering the Start Line for Automatic Measuring Data LoggerEntering the Stop Line for Automatic Measuring Starting and Interrupting Automatic MeasuringMessage Storing the Data Logger Measurement Results on the SD CardMaintenance Technical Customer Support Customer ServiceFeatures RF component Technical DataLevel measuring component +14.1 dB SIGNAL-TO-NOISE RatioTechnical Appendix Command SET for EXR 22 Kathrein Matrix Diseqctm Commands for Kathrein MatricesCommand SET for Kathrein Matrices Command SET for EXR 20 Kathrein MatrixChannel UND Frequency TABLE, Standard B/G Frequency in MHZ Channel TablesVHF UHF Channel UND Frequency TABLE, Standard L Frequency in MHZVII Channel UND Frequency TABLE, D/K Standard Frequency in MHZChannel UND Frequency TABLE, I Standard Frequency in MHZ Hence the values for ARD Das Erste are Calculation of SAT if Frequency Using the MSKThis is done as follows Oscillation frequency is made up as followsPage Page 936.3474/A/0409/ZWT Technical data subject to change