User manual TEKTRONIX RFM210

[. . . ] User Manual RFM210 DVB-T Measurement Receiver 071-1098-00 This document applies to firmware version FW0722 Rev04 and above. Warning The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so. Refer to all safety summaries prior to performing service. www. tektronix. com Copyright © Tektronix, Inc. [. . . ] -1 Alarm 1 Alarm 2 Alarm 3 Alarm 1-- 8 Relay Relay Relay Open collector outputs Configurable for Alarm on 18 measurement Parameters including IQ Analysis Configurable as Alarm 1 Critical Alarm for PSU fail Configurable for Alarm on 18 measurement Parameters including IQ Analysis All Alarms are configurable via the front panel. RFM210 DVB-T Measurement Receiver User Manual 5- 49 Alarms 5- 50 RFM210 DVB-T Measurement Receiver User Manual Calibration Mode Transmission system monitoring is usually accomplished by observing changes to the MER. The absolute reading is typically not as important as the variation in the reading. For those situations where it is desired to match the RFM210 MER reading to that of a laboratory-grade reference receiver, a Calibration Mode is provided. When Calibration Mode is enabled, the RFM210 displays an MER that is calculated from the actual MER measurement and a special calibration offset, called Equivalent Noise Degradation or END. The END value represents the difference in receiver noise floor between the RFM210 and the laboratory receiver. Over a limited range of MER variation, proper selection of the END value results in both receivers giving comparable measurements. Enabling Calibration Mode Go into the DSP Setup Menu by scrolling down to the Monitoring Menu and pressing ENTER twice. The END level must be set before accurate MER readings are displayed. Setting the END Level The END level is set in the Calibration menu, using the cursor keys. To set the END Level, both the RFM210 and the reference receiver must be connected to the DVB- signal being monitored, so that MER readings are available from -T both instruments. The END Level may be determined in two ways: by calculation, or by trail and error. Calculating END END is determined from the following formula: END = 10 log 10 -MERa 10 - 10 -MERb 10 where: MERa is the uncorrected RFM210 MER reading in dB. END is the END Level that should be entered into the RFM210 LEVEL field. RFM210 DVB-T Measurement Receiver User Manual 5- 51 Calibration Mode Example END Calculation As an example, suppose the RFM210 MER measurement is 29. 18 dB (calibration DISABLEd) and the Reference receiver MER measurement is 35. 0 dB. The calculation of the END level would be: END = 10 log 10 -29. 18 10 - 10 -35. 0 = 30. 5 dB 10 Now enter 30. 5 under Calibration LEVEL, and select Calibration ENABLE. The RFM210 MER will now read approximately 35 dB. Trial and Error Determination of END In this method, repeated trial values of END LEVEL are entered until the RFM210 corrected MER reads identically to that of the Reference receiver. Selecting the starting trial value is simplified by noting that LEVEL is always greater than the RFM210 uncorrected MER value. If it is lower than the reference receiver value, re-enter the Calibration menu and lower the LEVEL. This procedure converges quite quickly and has the advantage of requiring no calculation. Calibration mode is individually set on each channel, and the unique END Value for that channel must be determined if Calibration is to be used. When Calibration is enabled, the MER reading may drift more, especially if there is a substantial difference between the reference receiver and uncorrected RFM210 MER readings. To get the same measurement stability as when Calibration is disabled, the number of symbols should be increased. For example, for 2K systems, if 200 symbols are selected with Calibration disabled, then between 300 and 400 symbols should be used with Calibration enabled. 5- 52 RFM210 DVB-T Measurement Receiver User Manual Specifications Technical Specifications Table 6- 1: RFM210 technical specifications Subject Mains Rear panel label Line Voltage Function Mains AC supply Specification 95 - 240 VAC, 0. 7 - 0. 3 A, 50/60 Hz, 35 W Fuse Rating 1. 6 A, , slow blow type Tuner RF IN Frequency Range* RF Input Level* Frequency Accuracy Channel Bandwidth (Specific to version) Typical Noise Figure Input Impedance Typical Input Return Loss Baseband Signals BASEBAND INPUT Low IF input available to accept external input 46 - 860 MHz (VHF-- UHF) - 10 to - 77 dBm (-- 20 to - 55 dBm Optimum) Double Conversion 6, 7 or 8 MHz 9 dB 75 10 dB 3. 429 MHz (6 MHz BW) 4. 0 MHz (7 MHz BW) 4. 571 MHz (8 MHz BW) Input level - 10 dBm 50 Input level - 10 dBm 50 Input gain adjustment range - 5 dBm to - 20 dBm 3. 429 MHz 4. 0 MHz 4. 571 MHz (6 MHz BW) (7 MHz BW) (8 MHz BW) BASEBAND INPUT GAIN BASEBAND OUTPUT Baseband Input Gain adjustment potentiometer Low IF output available for external monitoring Baseband Output Gain adjustment potentiometer DVB - ASI TS High Priority DVB - ASI TS Low Priority or HP Priority in non-hierarchical mode DVB - SPI (LVDS) TS High Priority DVB - SPI (LVDS) TS Low Priority or HP Priority in non-hierarchical mode BASEBAND OUTPUT GAIN MPEG2 Transport p Streams (TS) DVB-- ASI OUT HP DVB-- ASI OUT LP (HP) DVB-- SPI HP OUT DVB-- SPI LP (HP) OUT Output level typically - 10 dBm 50 Output gain adjustment range - 5 dBm to - 20 dBm ASI Transport Stream 75, 800 mV signal SPI Transport Stream Low Voltage Differential Signalling Output RFM210 DVB-T Measurement Receiver User Manual 6- 1 Technical Specifications Table 6- 1: RFM210 technical specifications (Cont. ) Subject COFDM Demodulator Rear panel label Function Modulation Systems Carriers Supported Viterbi FEC Rates Guard Intervals Hierarchical Modes Specification QPSK 16QAM 64QAM 2K/ 8K DVB-- T 1/2, 2/3, 3/4, 5/6, 7/8 1/32, 1/16, 1/8, 1/4 Non-Hierarchical and Hierarchical Modes supported with simultaneous HP and LP TS available Reed Solomon (204, 188) and Viterbi Correction Status of TPS, FEC Interfering PAL Analog Carrier 75 , 3. 5 V peak typical 75 , 3. 5 V logic signal 75 , 3. 5 V peak typical 300 mV signal typical 75 , 3. 5 V peak typical 75 , 0. 5 V peak typical 100 , 5 V peak typical 100 , 5 V peak typical MER dB MER Average % MER Peak dB BER Pre Viterbi BER Post Viterbi Ratio in dBs Mean and Deviation Imbalance in % Error in º In dBs In º RMS Loss of TX Sync Errors remaining post-Reed Solomon Frequency Response, Group Delay, Impulse Response via PC application Error Correction Synchronization Monitoring DVB-- T input level Max Channel Monitoring 1. Ch Channell S State Mode Md X/TRIG Y/W Z VGA Monitor Ethernet TR 101 290 Measurement VGA PRIMARY TEST Constellation (X Axis) Channel State Synchronization Constellation (Y Axis) Channel State Modulation Intensity (Z Axis) VGA Output 10base-- T Ethernet Ethernet Monitor MER Modulation Error Ratio BER Bit Error Ratio S/N Signal to Noise STE System Target Error AI Amplitude Imbalance QE Quadrature Error CS Carrier Suppression PJ Phase Jitter SF Sync Failure UCE Uncorrectable Errors Channel Response 6- 2 RFM210 DVB-T Measurement Receiver User Manual Technical Specifications Table 6- 1: RFM210 technical specifications (Cont. ) Subject Mechanical Rear panel label Function Height Depth Width Weight Environmental Ratings g Operating Temperature Operating Humidity Operating Altitude Equipment Class * Specification Standard 1U (44 mm) 400 mm Standard 19 inch Rack Mounting 4. 5 kg +5° C to +35° C 20% to 80% non-- condensing 2000 m (6500 ft. ) maximum Environmental testing as per Equipment Class 5 See following Notes Notes Tuner Frequency Range The COFDM tuner accepts RF signals in bands VHF and UHF (470 MHz to 860 MHz). The channel plan held within each unit is specific and therefore will determine the channels the receiver will demodulate. Where the allocated channel plan includes upper or lower offsets to the standard channels, these are selectable as defined channels. [. . . ] Periodic cleaning reduces instrument breakdown and increases reliability. You should clean the instrument as needed, based on the operating environment. Dirty conditions may require more frequent cleaning than computer room conditions. RFM210 DVB-T Measurement Receiver User Manual G- 1 Appendix G: Cleaning and Maintenance Cleaning the Exterior Clean the exterior surfaces of the instrument with a dry, lint-free cloth or a soft-bristle brush. If dirt remains, use a cloth or swab dampened with a 75% isopropyl alcohol solution. [. . . ]