MO-160 User manual - Test Equipment Depot
Contents
1. CHANNEL FREQ CHANNEL FREQ CHANNEL FREQ 50000000 Hz 482000000 Hz 674000000 Hz 58000000 Hz 490000000 Hz 682000000 Hz 62750000 Hz 498000000 Hz 690000000 Hz 66000000 Hz 506000000 Hz 698000000 Hz 178750000 Hz 514000000 Hz 706000000 Hz 186750000 Hz 522000000 Hz 714000000 Hz 194750000 Hz 530000000 Hz 722000000 Hz 202750000 Hz 538000000 Hz 730000000 Hz 210750000 Hz 546000000 Hz 738000000 Hz 218750000 Hz 554000000 Hz 746000000 Hz 226750000 Hz 562000000 Hz 754000000 Hz 234750000 Hz 570000000 Hz 762000000 Hz C13 242750000 Hz C34 578000000 Hz C58 770000000 Hz C14 290750000 Hz C35 586000000 Hz C59 778000000 Hz D01 306000000 Hz C36 594000000 Hz C60 786000000 Hz D02 318000000 Hz C37 602000000 Hz C61 794000000 Hz D03 330000000 Hz C38 610000000 Hz C62 802000000 Hz D04 342000000 Hz C39 618000000 Hz C63 810000000 Hz D05 354000000 Hz C40 626000000 Hz C64 818000000 Hz D06 366000000 Hz C41 634000000 Hz C65 826000000 Hz D07 378000000 Hz C42 642000000 Hz C66 834000000 Hz D08 390000000 Hz C43 650000000 Hz C67 842000000 Hz D09 402000000 Hz C44 658000000 Hz C68 850000000 Hz C21 474000000 Hz C45 666000000 Hz C69 858000000 Hz 02 20082. 8 3 INSTALLATION 9 MM EO 9 34 1 Operation using the MAINS iaciunt tenete nee ticus 9 3 2 Installation and Start up 9 4 OPERATING INSTRUCTIONS sese nennen 11 4 1 Front panel description saga dd 4 2 Rear panel description 12 43 Ment tUNC NS enero reno 13 4 4 MODULATOR functions esee enne nennen nennen 14 4 5 RF functions sess 4 6 LEVEL AUNCtONS sis ctii E Aene 4 1 TESTTUNCUN De 4 8 CONFIGURATION functions 4 9 REMOTE control through RS 232 interface 22 4 10 DVB T useful bit rates arias 27 4 11 Error Information 4 11 1 Types of errors 411 2 Error GOGing aiii 5 MAINTENANCE 33 5 1 Mains fuse replacement 33 5 2 Cleaning Recommendations essen 33 APPENDIX A Channel Plans DVB T COFDM MODULATOR MO 160 Digital Video Broadcasting 1 1 GENERAL 1 1 General description The MO 160 is a DVB T modulator fully compliant with the standard ETSI EN 300 744 v1 5 1 The modulator input is an MPEG 2 transport stream TS in DVB SPI or DVB ASI format The outputs are DVB T signals COFDM modulated and up converted to IF and RF The MO 160 supports 2k and 8k modes as well as hierarchical t
3. The cover should be cleaned by means of a light solution of detergent and water applied with a soft cloth Dry thoroughly before using the system again CAUTION Do not use for the cleaning of the front panel alcohol or its derivatives These products can attack the mechanical properties of the materials and diminish their useful time of life Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com 02 2008 Page 33 MANUAL DE INSTRUCCIONES USER S MANUAL MO 160 ZA PROMAX AP NDICE A Listas de Canales APPENDIX A Channel Plans Lista de canales CCIR CCIR channel plan 50500000 Hz 330000000 Hz 602000000 Hz 57500000 Hz 338000000 Hz 610000000 Hz 64500000 Hz 346000000 Hz 618000000 Hz 107500000 Hz 354000000 Hz 626000000 Hz 114500000 Hz 362000000 Hz 634000000 Hz 121500000 Hz 370000000 Hz 642000000 Hz 128500000 Hz 378000000 Hz 650000000 Hz 135500000 Hz 386000000 Hz 658000000 Hz 142500000 Hz 394000000 Hz 666000000 Hz 149500000 Hz 402000000 Hz 674000000 Hz 156500000 Hz 410000000 Hz 682000000 Hz 163500000 Hz 418000000 Hz 690000000 Hz 170500000 Hz 426000000 Hz 698000000 Hz 177500000 Hz 434000000 Hz 706000000 Hz 184500000 Hz 442000000 Hz 714000000 Hz 191500000 Hz 450000000 Hz 722000000 Hz 198500000 Hz 458000000 Hz 730000000 Hz 205500000 Hz 466000000 Hz 738000000 Hz 212500000 Hz 474000000 Hz 746000000 Hz 219500000 Hz 482000000 Hz 754000000 Hz 226500000 Hz 490000000 Hz 762
4. Input TS bit rate constant and equal to the value given in the DVB T document no stuffing Tolerance 0 1 o 50 O BNC female connector Variable between 32 and 36 MHz in steps of 1 Hz fixed at 36 MHz when RF output is off Selectable via front panel controls 0 dBm 107 dBuV fixed 0 5 dB 10 ns 20 ppm 0 dBc 39 dBc 2k 47 dBc 8k 52 dBc 50 dBc 40 dB S Frequencies are referred to the central frequency for an 8 MHz channel Peak levels measured using a 10 kHz bandwidth are referred to the carriers located on either side of the spectrum Values shown are the worst case and correspond to guard intervals of 1 32 3 Value measured in master mode In slave mode the MER is greater than 38 dB for 8 MHz channels and around 35 dB for 7 and 6 MHz Page 4 02 2008 USER S MANUAL MO 160 RF OUTPUT Type Frequency range Spectrum polarity Power level average Frequency stability MER SPURIOUS DVB T PARAMETERS IFFT size Guard intervals Code rates Constellations Hierarchical modes MFN operation Channel bandwidth TEST MODES Carrier blanking Pilot carriers Single carrier TS packet generation PRBS generation Bit error injection 02 2008 Z 50 Q N type female connector Adjustable between 470 and 875 MHz in 1 Hz steps Selectable via front panel controls Approximately 90 dBuV not calibrated with no attenuation Variable attenuation
5. and the answer is NAMO 160 always without quotes Some amount of parsing must be applied to recover the wanted data from the answer text in this case MO 160 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com 02 2008 Page 23 AxPROMAX USER S MANUAL MO 160 Here follows a table with all available commands Message 2NAM lt cr gt gt gt 2VER lt cr gt gt gt BEP lt cr gt USRtext lt cr gt Description and Format Retrieve equipment model Retrieve SW version Acoustic indication Set a new USER text to be displayed in the LCD panel text is an ASCII text with a maximum of 32 lt NAMMO 160 lt cr gt lt VERVvO 7 10 lt cr gt characters 2USR lt cr gt USRtext lt cr gt Returns the current USER text STOnn lt cr gt nr is a decimal va Save the current configuration to a memory ue from 00 to 10 RCLnn lt cr gt nr is a decimal va Retrieve a configuration from a memory ue from 00 to 10 FRQnn n lt cr gt Modify the equipment RF frequency nn n is the frequency value in Hz expressed with 9 digits from 45 to 875 MHz 2FRQ lt cr gt FRQnn n cr Returns the current RF frequency in Hz and with 9 digits padding with 0 on the left lt gt Change the RF output attenuation nn is the new decimal
6. 5147059 16 1274510 17 0761246 17 5935829 15 2404412 16 9338235 17 9299308 18 4732620 13 0632353 14 5147059 15 3685121 15 8342246 17 4176471 19 3529412 20 4913495 21 1122995 19 5948529 21 7720588 23 0527682 23 7513369 21 7720588 24 1911765 25 6141869 26 3903743 22 8606618 25 4007353 26 8948962 27 7098930 Table 2 Useful bit rate Mbps for DVB T modes and 7 MHz channel bandwidths Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 Page 28 FAX 781 665 0780 TestEquipmentDepot com 02 2008 For hierarchical modulations you must follow the guidelines shown below Table 1 Convolutional Guard interval Constellation d coge 1 4 1 8 1 16 1 32 3 7323529 4 1470588 4 3910035 4 5240642 4 9764706 5 5294118 5 8546713 6 0320856 5 5985294 6 2205882 6 5865052 6 7860963 6 2205882 6 9117647 7 3183391 7 5401070 6 5316176 7 2573529 7 6842561 7 9171123 7 4647059 8 2941176 8 7820069 9 0481283 9 9529412 11 0588235 11 7093426 12 0641711 11 1970588 12 4411765 13 1730104 13 5721925 12 4411765 13 8235294 14 6366782 15 0802139 13 0632353 14 5147059 15 3685121 15 8342246 11 1970588 12 4411765 13 1730104 13 5721925 14 9294118 16 5882353 17 5640138 18 0962567 16 7955882 18 6617647 19 7595156 20 3582888 18 6617647 20 7352941 21 9550173 22 6203209 19 5948529 21 7720588 23 05
7. 650000000 Hz C64 818000000 Hz C23 490000000 Hz C44 658000000 Hz C65 826000000 Hz 498000000 Hz 666000000 Hz 834000000 Hz 506000000 Hz 674000000 Hz 842000000 Hz 514000000 Hz 682000000 Hz 850000000 Hz 522000000 Hz 690000000 Hz 858000000 Hz 530000000 Hz 698000000 Hz C29 538000000 Hz C50 706000000 Hz Lista de canales UHF UHF channel plan CHANNEL FREQ CHANNEL FREQ CHANNEL FREQ C21 474000000 Hz C38 610000000 Hz C55 746000000 Hz C22 482000000 Hz C39 618000000 Hz C56 754000000 Hz C23 490000000 Hz C24 498000000 Hz C40 C41 626000000 Hz 634000000 Hz C57 C58 762000000 Hz 770000000 Hz C25 506000000 Hz C42 642000000 Hz C59 778000000 Hz C26 514000000 Hz 522000000 Hz C43 650000000 Hz 658000000 Hz C60 786000000 Hz 794000000 Hz 530000000 Hz 666000000 Hz 802000000 Hz 538000000 Hz 674000000 Hz 810000000 Hz 546000000 Hz 682000000 Hz 818000000 Hz 554000000 Hz 562000000 Hz 690000000 Hz 698000000 Hz 826000000 Hz 834000000 Hz 570000000 Hz 706000000 Hz 842000000 Hz 578000000 Hz 714000000 Hz 850000000 Hz 586000000 Hz 722000000 Hz 858000000 Hz 594000000 Hz 730000000 Hz 602000000 Hz 738000000 Hz 02 2008 MANUAL DE INSTRUCCIONES USER S MANUAL MO 160 ZA PROMAX Lista de canales STDL STDL channel plan
8. data rate at the TS input is either too high or too low for the DVB T configuration being used Recall that this bit rate should be within 0 1 o of the values shown in the Tables of section 4 10 Therefore if the hex XX value shown is for example 0x24 we are in MASTER mode in any of the hierarchical modes we must split the binary code and analyse each bit separately in order to determine the type of failure HEX b7 b6 b5 b4 b3 b2 b1 bO 24 0 0 1 0 0 1 0 0 02 2008 Page 31 AxPROMAX USER S MANUAL MO 160 In this case bits b5 and b2 have been asserted indicating that there are two types of errors b5 The bit rate of the selected HP TS input is too high b2 Loss of synchronization with selected LP TS input YY This complementary information is also expressed in hexadecimal The value of each bit indicates a possible anomaly in the operation of the circuit In all cases a deviation with respect to the value of reference indicates a failure in some of the circuits that compose the modulator Contact technical assistance CSC for repair The value of reference all OK is 1B which corresponds to the following value of each bit HEX b7 b6 b5 b4 b3 b2 bi b0 1B 0 0 0 1 1 0 1 1 Bits b7 and b6 are always 0 Bit b1 is always 1 A change in bits b5 b4 or b3 indicates failure in the IF generation circuitry Digital to Analogue converter A change in bits b2 or bO implies
9. service of CSC 4 MOD FAIL It covers all errors corresponding to the MPEG 2 transport stream inputs not being correctly synchronized and or not having the right bit rate 4 11 2 Error Coding NAK BUSY and UNKN are for internal use of Promax If any of these errors occurs repeatedly the equipment ought to be taken to a PROMAX s customer service centre for repair MOD FAIL The display format for this type of errors is as follows ERR02 MOD FAIL STATUS XXYY CCC C When this type of errors occur the MO 160 presents an error message on the LCD display starting with the word STATUS and followed by an explanation of the type of error e g HP TS SYNC LOST LP TS BUFFER FULL or INVALID TS RATE Needless to say in this scenario the ERROR LED flashes red for 5 seconds and then stays lit until the error count is cleared within the CONFIGURATION menu The numerical fields have the following meaning XX Hexadecimal value composed by several information bits with meaning according to the modulator configuration Eight bits compose the data structure Each bit marks an error status when its value is 1 except when the opposite is indicated b7 b6 b5 b4 b3 b2 b1 b0 Page 30 02 2008 Bits b7 and b6 are always 0 Bits b5 to b2 have meaning if the equipment is working in MASTER mode They indicate the state of synchronisation of the modulator with the MPEG 2 input TS HP or LP as follows b5 HP TS buffer full The inpu
10. 000000 Hz 233500000 Hz 498000000 Hz 770000000 Hz 240500000 Hz 506000000 Hz 778000000 Hz 247500000 Hz 514000000 Hz 786000000 Hz 254500000 Hz 522000000 Hz 794000000 Hz 261500000 Hz 530000000 Hz 802000000 Hz 268500000 Hz 538000000 Hz 810000000 Hz 275500000 Hz 546000000 Hz 818000000 Hz 282500000 Hz 554000000 Hz 826000000 Hz 289500000 Hz 562000000 Hz 834000000 Hz 296500000 Hz 570000000 Hz 842000000 Hz 306000000 Hz 578000000 Hz 850000000 Hz 314000000 Hz 586000000 Hz 858000000 Hz S23 322000000 Hz C36 594000000 Hz 02 2008 AxPROMAX Lista de canales OIRT OIRT channel plan CHANNEL FREQ 52500000 Hz MANUAL DE INSTRUCCIONES USER S MANUAL MO 160 CHANNEL FREQ 546000000 Hz CHANNEL FREQ 714000000 Hz 62000000 Hz 554000000 Hz 722000000 Hz 80000000 Hz 562000000 Hz 730000000 Hz 88000000 Hz 570000000 Hz 738000000 Hz 96000000 Hz 578000000 Hz 746000000 Hz 178000000 Hz 586000000 Hz 754000000 Hz 186000000 Hz 594000000 Hz 762000000 Hz VIII 194000000 Hz C37 602000000 Hz C58 770000000 Hz IX 202000000 Hz C38 610000000 Hz C59 778000000 Hz x 210000000 Hz C39 618000000 Hz C60 786000000 Hz XI 218000000 Hz C40 626000000 Hz C61 794000000 Hz XII 226000000 Hz C41 634000000 Hz C62 802000000 Hz C21 474000000 Hz C42 642000000 Hz C63 810000000 Hz C22 482000000 Hz C43
11. 27682 23 7513369 Table 3 Useful bit rate Mbps for DVB T modes and 6 MHz channel bandwidths For hierarchical modulations you must follow the guidelines shown below Table 1 4 11 Error Information When using the equipment operating errors can occur as well as errors related to the loss of synchronization in the MPEG 2 input transport stream The first 16 errors appearing during the instrument operation are internally registered and can be retrieved or erased by means of the functions in CONFIGURATION menu This section describes the error list display format and the meaning of the codes that appear in each case for each type of error 02 2008 Page 29 AxPROMAX USER S MANUAL MO 160 4 11 1 Types of errors The control program of the MO 160 can detect and show up to 4 types of errors Some of them correspond to instrument malfunction and must be directly reported to a PROMAX s Customers Service Centre CSC Others state incorrect options about modulator input signals 1 NAK An internal device connected to control I C bus does not respond to the messages from the microcontroller It requires service of CSC 2 UNKN Unknown error Due to a problem different to the one previously described the I C control system cannot be accessed lt requires service of CSC 3 BUSY The bus controller is busy and has not been possible to recover its operation It requires
12. 36 MHz The polarity of the IF RF spectrum inverted or non inverted can be selected by the user The MO 160 has been designed to work in Multi Frequency Networks MFN Single Frequency Network SFN operation is not currently supported The quality of the output signal has been optimised for 8 MHz channels The MER measured at IF in this case is approximately 40 dB in master mode The operation of the MO 160 is done via the front panel LCD display and controls The modulator can be easily configured by navigating through a rather intuitive set of menus A couple of LEDs located on the front panel signal the existence of errors in the modulator or whether the equipment is properly powered 02 2008 Page 3 AxPROMAX 1 3 Specifications A INPUTS MPEG 2 Transport Stream Operating modes Master Slave IF OUTPUT Type Frequency range Spectrum polarity Power level average In band amplitude ripple In band group delay ripple Frequency stability Out of band spectral characteristics O 3 805 MHz 4 25 MHz 5 25 MHz Level of harmonics and spurious MER USER S MANUAL MO 160 Two DVB ASI inputs 75 Q female BNC One DVB SPI input LVDS DB 25 TS packets of length 188 or 204 bytes automatic detection Support for burst and continuous packet mode Input TS bit rate strictly below the value given in the DVB T specification Packet stuffing for bit rate adaptation and PCR re stamping are carried out automatically
13. 431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com AxPROMAX USER S MANUAL MO 160 Turning the encoder CW or CCW cycles through the submenu titles MODULATOR RF LEVEL TEST CONFIGURATION Qr pe Nes 4 4 MODULATOR functions At this menu level the modulator parameters can be modified and customised to the user s needs When modifying any modulation parameter changes became active only when confirmed by pressing the encoder function Instead pressing the MENU key allows us to cancel the change of option Let s comment on each function Page 14 HP TS Input Selects the input used for providing a High Priority HP Transport Stream TS to the COFDM modulator Note that in non hierarchical transmissions this is the only TS input to the modulator Options are ASI1 Use TS provided at ASI1 input connector rear panel ASI2 Use TS provided at ASI2 input connector rear panel SPI Use parallel TS provided by SPI connector rear panel PRBS Use internally generated PRBS data to generate TS test packets LP TS Input Selects the input used for providing a Low Priority LP Transport Stream TS to the COFDM modulator Note that in non hierarchical transmissions this input is not used Options are ASI Use TS provided at ASI1 input connector rear panel ASI2 Use TS provided at ASI2 input connector rear panel SPI Use parallel TS provided by SPI connector rear panel PRBS U
14. 6863 9 7577855 10 0534759 8 7088235 9 6764706 10 2456747 10 5561497 9 9529412 11 0588235 11 7093426 12 0641711 13 2705882 14 7450980 15 6124567 16 0855615 14 9294118 16 5882353 17 5640138 18 0962567 5 6 16 5882353 18 4313725 19 5155709 20 1069519 7 8 17 4176471 19 3529412 20 4913495 21 1122995 1 2 14 9294118 16 5882353 17 5640138 18 0962567 2 3 19 9058824 22 1176471 23 4186851 24 1283422 64QAM 3 4 22 3941176 24 8823529 26 3460208 27 1443850 5 6 24 8823529 27 6470588 29 2733564 30 1604278 7 8 26 1264706 29 0294118 30 7370242 31 6684492 Table 1 Useful bit rate Mbps for DVB T modes and 8 MHz channel bandwidths 02 2008 Page 27 AxPROMAX USER S MANUAL MO 160 For hierarchical modulations with an 8 MHz bandwidth the useful bit rates can be obtained from Table 1 following these indications Sequence of high priority HP QPSK values Sequence of low priority LP 16QAM QPSK values Sequence LP 64QAM 16QAM values Convolutional Guard interval code 1 8 1 16 Constellation 4 3544118 4 8382353 5 1228374 5 2780749 5 8058824 6 4509804 6 8304498 7 0374332 6 5316176 7 2573529 7 6842561 7 9171123 7 2573529 8 0637255 8 5380623 8 7967914 7 6202206 8 4669118 8 9649654 9 2366310 8 7088235 9 6764706 10 2456747 10 5561497 11 6117647 12 9019608 13 6608997 14 0748663 13 0632353 14 5147059 15 3685121 15 8342246 14
15. Test Equipment 99 Washington Street Depot Melrose MA 02176 Phone 781 665 1400 1 800 517 8431 Toll Free 1 800 571 8431 MO 160 MODULADOR COFDM DVB T DVB T COFDM MODULATOR 0 MI1548 AxPROMAX NOTAS SOBRE SEGURIDAD Antes de manipular el equipo leer el manual de instrucciones y muy especialmente el apartado PRESCRIPCIONES DE SEGURIDAD El s mbolo A sobre el equipo significa CONSULTAR EL MANUAL DE INSTRUCCIONES En este manual puede aparecer tambi n como s mbolo de advertencia o precauci n Recuadros de ADVERTENCIAS Y PRECAUCIONES pueden aparecer a lo largo de este manual para evitar riesgos de accidentes a personas o da os al equipo u otras propiedades SAFETY NOTES Read the user s manual before using the equipment mainly SAFETY RULES paragraph The symbol A on the equipment means SEE USER S MANUAL In this manual may also appear as a Caution or Warning symbol Warning and Caution statements may appear in this manual to avoid injury hazard or damage to this product or other property TABLE OF CONTENTS f GENERAL T 1 1 1 General description zl 1 2 Functional description 225 1 3 Specifications en eite nci ipa etate crane 4 2 SAFETY RULES ted ach ic erdt pic o ipe 2 1 General safety rules PE 2 2 Descriptive Examples of Over Voltage Categories
16. arriers starting at index Start Carrier and ending at index Stop Carrier see section 4 7 TEST parameters Pilots only Generate a DVB T signal containing pilot carriers only continual and TPS PRBS TR290 Replace the input to the constellation mapper with a PRBS sequence of length 275 1 or 223 1 see PBRS bits entry above as specified in document ETSI TR 101 290 4 5 RF functions The selection of this item allows us to access those functions related to the RF output Let s review each option e Frequency This function allows the selection of the RF frequency Changes made by turning the rotary encoder are applied directly to the output allowing for a smooth tuning of the output frequency When entering this function the display shows the current frequency and the step used to modify it if the encoder is turned Frequency increments are positive when turning CW and negative if CCW The LCD panel looks as follows MENU back PUSH select TURN next prev RF Frequency 650000000 Hz lt 10MHz gt In this case the current output frequency is 650 MHz and turning CW one notch each notch is marked by an audible tone will change that value to 660 MHz 02 2008 Page 17 AxPROMAX USER S MANUAL MO 160 In this situation each time we press the encoder button the frequency step will be modified to 1 MHz 100 kHz 10 kHz 1 kHz 100 Hz 10 Hz 1 Hz and again to 10 MHz allowing a cyclic selection of the desired step va
17. as many different functions Moving across the different display menus and sub menus and validating selected options When the rotary encoder is pressed and we are modifying any equipment function the option currently being shown on the LCD panel is selected Turning the encoder clockwise CW or counter clockwise CCW allows us to navigate through each menu function and option available in the MO 160 4 2 Rear panel description The rear panel shows from right to left the mains socket for AC voltage input the fan air outlet a DB 9 connector for remote control via an RS 232C COM port a parallel DVB SPI TS input two DVB ASI TS inputs an IF nominally 36 MHz test output and the main RF output at the frequency and level chosen by the user Figure 2 Rear panel view 6 RF output 500 female N type connector 7 IF output 500 female BNC 8 ASI input 750 female DVB ASI input number 1 9 ASI2 input 750 female BNC DVB ASI input number 2 10 Parallel TS input DB 25 DVB SPI input 11 RS 232C connector DB 9 DB 9 connector for remote control via an RS 232C COM port Page 12 02 2008 12 AC voltage connector Supplies power to the equipment 13 Mains switch Switch on or off the power supply NOTE The actual IF frequency value varies between 32 and 36 MHz depending on the RF frequency When a fixed 36 MHz is needed the RF output of the modulator has to be disabled in
18. attenuation value in dB 2ATT lt cr gt lt gt Returns the current padding with 0 on RF attenuation value nn value using 2 decimal digits he left ERN lt cr gt ERNnn n cr Retrieve the internal nn n value using padding with 0 on error counter 8 decimal digits he left ERC lt cr gt Clear the internal error counter ERLnn lt cr gt ERLtext lt cr gt Retrieve an error message is the error index in decimal value text is the text string in ASCII format 2LCK lt cr gt LOKchhhh cr Retrieve the locked status is the lock test result L for locked U for unlocked hhhh is an hexadecimal value corresponding to a status code see section 4 11 for error codes MIHd lt cr gt Sets the modulator HP TS Input d decimal digit 0 ASI1 1 ASI2 2 5 3 TEST 2MIH lt cr gt MIHd lt cr gt Asks for the current modulator HP TS input d as before MILd lt cr gt Sets the modulator LP TS input d decimal digi 0 ASI1 1 ASI2 2 5 3 TEST 2MIL lt cr gt MBWa lt cr gt MILd lt cr gt Asks for the current modulator HP TS input d as before Sets the modulator output BW d decimal digit 0 8MHz 1 7MHz 2 MHz 2MBW lt cr gt Page 24 MBWa lt cr gt Asks for the current modulator o
19. can be controlled using the following functions Attenuation this function allows to select the RF output level by applying 1 dB attenuation steps approximately from O dB to 30 dB Turning the encoder CW increases the attenuation reducing the output level Turning CCW enables the opposite behaviour Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com Page 18 02 2008 Level changes are applied immediately to the RF output to allow smooth and easy adjustment of RF output conditions Pressing the encoder or MENU key exits this function 4 7 TEST functions This menu contains a series of parameters used to correctly carry out all types of transmission tests using the MO 160 modulator MODE Selects the test to be carried out Available options are NONE Normal COFDM output CBER Inject channel bit errors to obtain a non zero BER before the Viterbi decoder Channel BER VBER Inject bit errors to obtain a non zero BER after the Viterbi decoder Viterbi BER or simply BER Blank carriers Blank carriers starting at index Start Carrier and ending at index Stop Carrier see below Pilots only Generate a DVB T signal containing pilot carriers only continual and TPS PRBS TR 290 Replace the input to the constellation mapper with a PRBS sequence of length 2 1 or 223 1 see PBRS bits entry above as specified in document ETSI TR 101 290 The following
20. cimal digit O 2K 1 8K 2FFT lt cr gt FFTd lt cr gt Asks for the current modulator FFT mode d as before INVd lt cr gt Sets the modulator spectral inversion mode INV d decimal digit O INV 1 NO INV INV lt cr gt INVd lt cr gt Asks for the current modulator spectral inversion mode d as before MODak lt cr gt Sets the modulator IF output mode d decimal digit MOD 0 COFDM 1 TONE MAX 2 TONE RMS MOD cr lt gt Asks for the current modulator IF output mode d as before FIFnn n lt cr gt Modify the equipment IF frequency nn n is the frequency value in Hz expressed with 8 digits from 31 to 37 MHz FIF cr FIFnn n lt cr gt Returns the current IF frequency in Hz expressed with 8 digits padding with 0 on the left DISd lt cr gt Disable the RF output d decimal digit DIS O ENABLE RF 1 DISABLE RF DIS lt cr gt DISd lt cr gt Asks for the current RF disable state d as before MPRd lt cr gt PRBS of 15 or 23 bits d decimal digit MPR 0 15 bits PRBS 1 23 bits PRBS MPR cr MPRd lt cr gt Asks for the current PRBS length with d as before FIF 02 2008 Page 25 AxPROMAX USER S MANUAL MO 160 Name Message Answer X Description and Format MRE MREd lt cr gt PCR restamping master mode ON OFF d decimal digit 0 ON 1 OFF MRE lt cr gt MREd lt cr gt Asks f
21. ction as well as the recall option explained hereafter automatically increments the memory number to allow to easily store and recall the contents of consecutive memories Load from Memory This is the counterpart function of the previous one Selecting the desired memory number a complete equipment configuration can be loaded e Channel Plan Use this function to choose among the channel plans included in the MO 160 Currently the available channel plans an ordered list of channel frequencies have been translated from the standard analogue channel plans A complete list of all channel plans has been included at the end of this document see Appendix A The selections displayed using the rotary encoder are CCIR Main west European standard STDL French standard OIRT East European standard UHF Only the UHF part from CCIR for faster selection Page 20 02 2008 e IF Mode By using this function the user can select generating a COFDM signal or a single tone A single tone can be useful for accurate alignment or testing of external components The available options are COFDM Generate a COFDM DVB T signal TONE MAX Generate a single tone at the maximum level available from the MO 160 TONE RMS Generate a single tone at an RMS level equal to the RMS level of the modulated COFDM signal e Error List During the continuous operation of the 160 the first 16 errors detected are stored as a reference to identify
22. dddddddd VBER x 1E10 2MVB lt cr gt MVBdddddddddd lt cr gt Asks for the current VBER value dddddddddd as before 02 2008 Z USER S MANUAL MO 160 4 10 DVB T useful bit rates In the following we present the useful bit rates Mbits s or Mbps for all combinations of guard interval constellation and convolutional code rates in DVB T systems and channels of 8 7 and 6 MHz bandwidths The useful bit rate does not depend on the transmission mode 2k or 8k These tables are similar to Tables 17 8 MHz E 6 7 MHz and E 3 6 MHz in document ETSI EN 300 744 v 1 5 1 2004 11 but with 7 digits of accuracy instead of 2 or 3 This additional accuracy is necessary since the bit rate of the input transport streams when operating in slave mode should not deviate more them a 0 1 from the values shown herein otherwise the MO 160 will not lock For example for QPSK code Ve and guard interval of 1 4 the useful bit rate of DVB T systems for 8 MHz bandwidth channels is 4 9764706 Mbps thus in slave mode the TS input bit rate to which the modulator is able to sync should be greater than 4 975973 Mbps and lesser than 4 976968 Mbps Constellation Convolutional code Guard interval 1 8 1 16 4 9764706 5 5294118 5 8546713 6 0320856 6 6352941 7 3725490 7 8062284 8 0427807 7 4647059 8 2941176 8 7820069 9 0481283 8 2941176 9 215
23. decimal character is received from the instrument When the instrument detects a complete command it sends an XOFF 0x13 code and once validated and executed an ACK 0x06 or NAK 0x15 code is sent to the remote controller To ensure error free communication between the two devices the communication parameters for the serial port on the remote controller are as follows Rate 19200 bauds Data bits 8 bits Parity None Stop bits 1 The MO 160 accepts remote commands at any time when the instrument is on Its not necessary to put the instrument in a special remote control mode The communication is carried out using the transmitter and receiver data lines on the serial port Also the control signals CTS and RTS must be connected A standard PC computer DB9F to DB9F NULL MODEM serial cable can be used when connecting the instrument to an available COM port The communication protocol is as follows 1 MO 160 transmits a XON code 0x11 every second The aim is to indicate to any possible remote device that the equipment is ready to receive data 2 At this moment data streams can be sent to it Each data stream is made of Initial character code 0x2A Set of characters that describe data message Final character CR carry return code OxOD 3 Once a data stream has been sent an XOFF will be received indicating that the transmission of any new command must wait until completion of the current one 4 Next if the messag
24. e format is correct and its execution has no errors an ACK acknowledge should be expected Otherwise an NAK not acknowledge will be received 5 If the sent message requires an answer it will be sent at this point Page 22 02 2008 6 Once completed the message processing the MO 160 will send an XON indicating that its ready for a new command A typical communication timing diagram would be as follows MO 160 1 XON equipment ready for command 2 NA lt cr gt gt command issued by the controller 3 XOFF command received indication 4 ACK command accepted understood 5 wait execution delay 6 NAMO 160 lt cr gt command answer sent 7 wait usually some small delay 8 XON equipment ready for command All characters are transmitted in ASCII code Commands should always be sent in capital letter and cannot be edited online once a character is received it is stored in the MO 160 buffer and cannot be rectified by sending an erase code When in communication idle mode MO 160 waiting for a command the instrument will send an XON code at one second intervals to allow synchronization Command list Commands are classified between interrogative and control commands They are initiated by sending an character and have ASCII text format and always share a similar structure For instance the equipment model name can be asked by sending NA lt cr gt
25. failure in the COFDM DVB T modulator circuitry CCC C This parameter is a global error counter It counts the number of errors at the moment in which the error message is displayed Therefore if an error of any type occurs continuously this counter will have a different value whenever we look at some of the first 16 errors detected by the equipment In relation to this value it must be noted that in order to detect an error for example the loss of synchronization with a TS input the equipment waits for this situation to occur for more than 5 seconds So it avoids errors in the transitions between different modulator functions or temporary TS input disconnections to be counted However the total error counter CCC C does count each occurrence regardless of whether or not it lasts more than 5 seconds Page 32 02 2008 5 MAINTENANCE A 5 1 Mains fuse replacement The fuseholder is located on the later panel of the equipment Before replacing the fuse disconnect the mains cord Take out the fuse holder with screwdriver Replace the fuse damaged by a suitable new one and place afresh the fuseholder Fuse 5x20 2AT 250V THE BREACH OF THESE INSTRUCTIONS COULD DAMAGE THE EQUIPMENT 5 2 Cleaning Recommendations CAUTION To clean the cover take care the instrument is disconnected CAUTION Do not use scented hydrocarbons or chlorized solvents Such products may attack the materials used in the construction of the cover
26. lue To quit this function the MENU key must be pressed e Channel Using the set of channel tables included in the MO 160 makes the output frequency tuning faster This allows direct selection of standard frequencies used in most countries Entering this function a list of all available channels is displayed sequentially Turning the encoder will lead us to the desired one Pushing the encoder selection key will exit that function The channel list is taken from a set of channel plans loaded into the equipment The available channel plans are displayed and selected from the CONFIGURATION menu as we ll see later Also in this case frequency changes are applied immediately to the RF stage allowing an interactive frequency adjustment The list of channel plans can be found in Appendix A Disable This option is to disable the RF output At the same time the IF frequency is tuned to a nominal value of 36 MHz The selectable values are NO YES 4 6 LEVEL functions This menu item collects the functions related to RF level adjustment The MO 160 has a built in variable attenuator of 25 to 30 dB programmed in 33 steps of 1 dB aproximately At the same time the nominal RF level can be finely adjusted using a voltage controlled attenuator This allows to set a reference level using the voltage controlled attenuator to then apply the mentioned 1 dB attenuation steps approximately to that reference value That RF gain structure
27. o 50 at 40 C MECHANICAL FEATURES Dimensions 482 W x 44 H x 381 D Weight 6 3 kg OPTIONS 160 10 dBm amplifier RECOMMENDATIONS ABOUT THE PACKING It is recommended to keep all the packing material in order to return the equipment if necessary to the Technical Service Page 6 02 2008 2 SAFETY RULES A 2 1 General safety rules The safety could not be assured if the instructions for use are not closely followed Use this equipment connected only to systems with their negative of measurement connected to ground potential This is a class equipment for safety reasons plug it to a supply line with the corresponding ground terminal This equipment can be used in Overvoltage Category Il installations and Pollution Degree 1 environments When using some of the following accessories use only the specified ones to ensure safety Power cord CA005 Observe all specified ratings both of supply and measurement Remember that voltages higher than 70 V DC or 33 V AC rms are dangerous Use this instrument under the specified environmental conditions The user is only authorized to carry out the following maintenance operations Replace the fuses of the specified type and value On the Maintenance paragraph the proper instructions are given Any other change on the equipment should be carried out by qualified personnel The negative of measurement is at ground potential Do not obstruct the ven
28. of O to 25 dB in 32 steps not calibrated dB 10 ppm 96 dB lt 35 dBc 2k 8k 1 4 1 8 1 16 1 32 1 2 2 3 3 4 5 6 7 8 QPSK 16QAM 64QAM 16QAM and 64QAM constellations with constellation ratio a 1 2 or 4 Available 6 7 and 8 MHz user selectable Blank a number of carriers start index to stop index within the COFDM ensemble This allows to measure in band intermodulation and quantisation noise Generate the pilot carriers only continual and TPS Generate a single carrier at the channel central frequency whose level equals the average COFDM output power or is set to the maximum available This is intended for signal level alignment Internal generation of test TS using PRBS sequences of length 15 or 23 embedded within NULL packets as specified in document ETSI TR 101 290 Map a PRBS sequence into constellation points following the guidelines of document ETSI TR 101 290 Inject bit errors at the input to the constellation mapper results in a non zero CBER before the Viterbi decoder or at the input to the convolutional encoder results in a non zero VBER after the Viterbi decoder Page 5 LAPROMAX sets MANUAL RS 232C INTERFACE POWER SUPPLY Voltage 90 250 VAC Frequency 50 60 Hz Consumption 20W OPERATING ENVIRONMENTAL CONDITIONS Indoor use Altitude Up to 2000 m Temperature range From 5 C to 40 C Max relative humidity 80 up to 31 C decreasing lineally up t
29. oming TS packet rate The slave mode allows to use one TS input with constant bit rate in non hierarchical modes When using hierarchy the user has to choose which TS HP or LP the selected TS input is mapped to This is the stream the modulator actually synchronises to The other hierarchical TS is generated internally as a PRBS test sequence The input bit rate in slave mode should be within 0 1 o of the values specified in the DVB T standard See section 4 10 DVB T useful bit rates and approximately constant This operating mode is useful when re modulating an off air DVB T signal with the same parameters without the need to demultiplex and re multiplex the transport stream as it would be the case in master mode The lock in range of the MO 160 with respect to the TS rate is typically greater than that of a COFDM demodulator It s thus possible that the modulator is perfectly synchronised in slave mode and however a DVB T receiver is unable to acquire sync In master mode the MO 160 is able to work with any incoming bit rate as long as this is strictly lower than the value given in the DVB T specification for the modulation parameters in use See section 4 10 DVB T useful code rates The input TS bit rate is adapted bit rate adaptation to the useful bit rate required by the DVB T signal by stuffing the TS with NULL packets packet stuffing This stuffing process alters the sequence of PCR values embedded in the TS These val
30. or the current restamping state d as before MTS MTSd lt cr gt TS lock mode MASTER or SLAVE d decimal digit O SLAVE 1 MASTER 2MTS lt cr gt MTSd lt cr gt Asks for the current TS lock mode d as before MSS MSSd lt cr gt Active TS in SLAVE mode d decimal digit O HP LLP MSS lt cr gt MSSd lt cr gt Asks for the Active TS in SLAVE mode d as before MPL MPL lt cr gt MPLhhh III cr or MPLhhh lt cr gt Asks for the TS packet length detected hhh amp IP ASCII text hhh lll 188 or 204 bytes for HP LP TS LP in hierarchical mode only Mlldddd lt cr gt Initial carrier index for the blank carriers test mode dddd decimal digits 0000 to 6816 8k 1604 2k Mll lt cr gt Mlldddd lt cr gt Asks for the initial carrier index value dddd as before MFI MFldddd lt cr gt Final carrier index for the blank carriers test mode dddd decimal digits 0000 a 6816 8k 1604 2k MFl cr MFldddd lt cr gt Asks for the final carrier index value dddd as before MCB MCBddddddd lt cr gt MCB lt cr gt MCBddddddd lt cr gt CBER value generated in test mode ddddddd decimal digits ddddddd CBER x 1E7 Asks for the current CBER value ddddddd as before Page 26 MVBdddddddddd lt cr gt VBER value generated in test mode dddddddddd decimal digits dd
31. problems Usually no errors are generated and the display should be as follows MENU back PUSH select TURN next prev NO ERRORS But during operation two different kinds of errors are possible See section 4 11 Error information e Errors generated when the modulator is not locked to the selected TS input These are usually temporary errors related to input transport stream transitions or invalid TS bit rates Errors generated due to a circuit failure When this kind of errors persists the instrument must be serviced in a PROMAX official center See section 4 11 for an explanation of the format used to display the errors e Clear Errors select this function to clear the internal error counter and errors list explained formerly The possible selections are NO YES e Firmware Indicates the version firmware included in the equipment sample screen looks as follows MENU back PUSH select TURN next prev CONFIGURATION Firmware v1 0 02 84 00 02 2008 Page 21 AxPROMAX USER S MANUAL MO 160 4 9 REMOTE control through RS 232 interface The MO 160 has an RS 232C compatible serial port to connect to a computer for remote control A suitable set of remote control commands allows enquiring and changing any functional parameter Communication details There is a control protocol to synchronize command reception and validation A command must be sent once an XON coded 0x11 hexadecimal value 11 or 17 in
32. r a successfully start up the equipment emits four acoustic tones to indicate that it is ready to begin operation When the equipment is connected to the mains the green LED LINE 3 remains lit 02 2008 Page 9 4 OPERATING INSTRUCTIONS WARNING The following described functions could be modified based on software updates of the equipment carried out after manufacturing and the publication of this manual 4 1 Front panel description Z PROMAX MO 160 DVB T MODULATOR Fe moie oem eaten dag m CO 0 00 O Figure 1 Front panel 1 LCD display With 2x40 characters crisply clear due to its white LED backlight 2 ERROR RED LED has a couple of functions For each operating second the first tenth of that second indicates whether there are sync problems in the modulator ON or not OFF Examples are loss of TS sync or invalid input bit rates The remaining nine tenths of a second the RED LED shows whether errors lasting more than 5 seconds since the last time the error counter was cleared are detected ON 3 LINE A GREEN LED indicator shows when the power supply is ON 4 MENU The MENU key allows the user to enter and exit the menu functions and to modify the equipment functional parameters modulation parameters output frequency and level and other configuration and setup functions 02 2008 Page 11 AxPROMAX USER S MANUAL MO 160 5 Rotary encoder button This h
33. ransmission and it could be used in Multi Frequency Networks MFN Digital coding and modulation are implemented by means of programmable logic devices using intellectual property developed by PROMAX This makes the design highly flexible allowing to tailor it to any particular application and offering plenty of features at low cost Highlights of this product are e 2kand 8k mode operation e Hierarchical modes e Master and Slave mode operation Channel bandwidth of 6 7 and 8 MHz user selectable High frequency resolution in steps of 1 Hz e High MER Digital Video 1 R Trade Mark of the DVB Digital Video Broadcasting Project 5363 02 2008 Page 1 AxPROMAX USER S MANUAL MO 160 1 2 Functional description The MO 160 is a general purpose DVB T modulator contained in a 19 1U chassis The unit has three selectable MPEG 2 TS inputs two serial ASI inputs and one parallel SPI input Either of these inputs can be used to modulate the COFDM signal in both hierarchical one TS input and non hierarchical two TS inputs modes An additional test TS can be generated internally in the modulator This allows to generate compliant DVB T signals even in the absence of a valid TS input In slave mode the useful bit rate at the TS input to the COFDM modulator has to be the one defined in ETSI EN 300 744 for each choice of DVB T transmission parameters The modulator automatically synchronises its internal clock to the inc
34. se internally generated PRBS data to generate TS test packets BW This option enables output channel bandwidth selection The COFDM signal can be generated with a BW of 6 MHz 7 MHz and 8 MHz 8 MHz selects an 8 MHz bandwidth 7 MHz selects a 7 MHz bandwidth 6 MHz selects a 6 MHz bandwidth 02 2008 02 2008 Hierarchy Using this function the COFDM modulator is switched between hierarchical mode with different alpha constellation ratios and non hierarchical mode operation The options available are OFF non hierarchical operation a 1 hierarchical mode with alpha 1 a 2 hierarchical mode with alpha 2 a 4 hierarchical mode with alpha 4 HP Code Rate Using this function the user can modify the convolutional code rate for the High Priority HP Transport Stream TS The available options are as follows 1 2 2 3 3 4 5 6 7 8 LP Code Rate Using this function the user can modify the convolutional code rate for the Low Priority LP Transport Stream TS The available options are as follows 1 2 2 3 3 4 5 6 7 8 Constellation Here the menu allows the selection of one of the available constellations The options are QPSK 16QAM 64QAM Guard Interval This function selects the required guard interval for the COFDM signal The available values are 1 4 1 8 1 16 1 32 Page 15 AxPROMAX Page 16 USER S MANUAL MO 160 FFT Mode Selection of the required FFT value n
35. t TS bit rate is above the maximum value You must reduce the transport stream bit rate If the hierarchical mode is activated this error refers to the high priority TS HP TS b4 LP TS buffer full The input TS bit rate is above the maximum value You must reduce the transport stream bit rate If the hierarchical mode is activated this error refers to the low priority TS LP TS b3 HP TS sync lost The synchronisation with the input TS has been lost The most probable cause is that an input transport stream is not available or that it has been temporally disconnected If the hierarchical mode is on this error refers to the high priority TS HP TS b2 LP TS sync lost The synchronisation with the input TS has been lost The most probable cause is that an input transport stream is not available or that it has been temporally disconnected If the hierarchical mode is on this error refers to the low priority TS LP TS Bits b1 to 0 have meaning if the equipment is in SLAVE mode If we are in hierarchical mode the information applies to the TS selected for synchronisation HP or LP In non hierarchical modes we refer to the main TS The meaning of each bit is as follows b1 TS sync lost The synchronisation with the input TS has been lost The most probable cause is that an input transport stream is not available or that it has been temporally disconnected b0 Valid TS rate This bit is erroneous when its value is 0 The
36. the RF menu 4 3 Menu functions After start up the equipment display shows information regarding the main operating conditions as can be seen in the following example FREQ 650000000 Hz ATT 10 dB FFT 8K CONST 64QAM BW 8 MHz GUARD 1 4 FREQ 650000000 Hz ATT 10 dB TEST NONE TS Master 204 Here the RF frequency is 650 MHz the 1 dB step RF attenuator is set to 10 dB the DVB T signal has 8K carriers occupies 8 MHz and uses a 64 QAM constellation with a guard interval of 1 4 No test mode is selected NONE and the operation mode of the MO 160 is set to master Packets of length 204 bytes are currently being detected on the TS input selected by the user After a few seconds the display changes its contents to show the working time and error count information as follows MO 160 PROMAX ELECTRONICA S A Working 01 13 55 ERR 0 The text on the upper line the name of the company in the example above could be customised via the RS232 port to the user s needs allowing for an easy identification of the equipment or for some piece of advice Pressing the MENU key allows us to enter the main menu level Pressing MENU again takes us to the main status display This main menu level uses the first text line to give some advice on the operation assigned to each control and the second line to display the selectable options and functions MENU back PUSH select TURN next prev MODULATOR Test Equipment Depot 800 517 8
37. tilation system of the instrument Use for the signal inputs outputs specially when working with high levels appropriate low radiation cables E Follow the cleaning instructions described in the Maintenance paragraph Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com AxPROMAX USER S MANUAL MO 160 Symbols related with safety DIRECT CURRENT ON Supply ALTERNATING CURRENT OFF Supply DIRECT AND ALTERNATING DOUBLE INSULATION Class Il protection CAUTION Risk of electric shock GROUND TERMINAL PROTECTIVE CONDUCTOR CAUTION REFER TO MANUAL FRAME TERMINAL FUSE EQUIPOTENTIALITY 2 2 Descriptive Examples of Over Voltage Categories Cat Low voltage installations isolated from the mains Cat Il Portable domestic installations Cat Ill Fixed domestic installations Cat IV Industrial installations Page 8 02 2008 3 INSTALLATION 3 1 Power Supply The MO 160 is an equipment powered through the mains for its operation 3 1 1 Operation using the Mains Connect the instrument to the mains through the AC voltage connector 12 located on the MO 160 rear panel Check if the mains voltage is according to the equipment specifications 3 2 Installation and Start up The MO 160 modulator is designed for use as a rack mounted 19 inches device 1U chassis Switch the main switch 13 located in the rear panel to position power on Afte
38. two parameters select the carrier interval to blank in order to make measurements of intermodulation noise and or quantisation noise within the channel Start Carrier Selects the initial index from O to 1704 in 2K 0 to 6816 in 8k of the first carrier to blank within the COFDM ensemble e Stop Carrier Selects the final index from O to 1704 in 2k O to 6816 in 8k of the last carrier to blank within the COFDM ensemble 02 2008 Page 19 AxPROMAX USER S MANUAL MO 160 These following two parameters set the amount of errors we inject into the modulator chain e Value Channel Bit Error Ratio to inject at the input of the mapper to constellation points This yields a non zero BER before the Viterbi decoder values from 7 6E 6 to 1 2E 1 VBER Value Viterbi BER to inject at the input to the convolutional encoder so that a non zero BER is obtained at the output of the Viterbi decoder values from 3 7E 9 to 6 2E 2 4 8 CONFIGURATION functions Under this menu tree there is a collection of functions related to the configuration and setup of the whole instrument Save to Memory The MO 160 has a number of configuration memories that allow to store the modulator parameters as well as the RF frequency and level To store the current configuration turn the encoder to select the desired memory number from O to 10 Press the encoder key to confirm the storing action Press the MENU key to cancel the action This fun
39. ues have to be re stamped for the resultant PCR jitter to remain within the limits specified by the DVB In hierarchical modes operating the MO 160 as master has the added advantage over the slave mode of being able to use any of the three TS inputs as the HP input LP input or both Whenever possible it is advised to use an input bit rate considerably lower than the nominal value given in the DVB T specification Otherwise an input rate too close to the required value might eventually lead to overflow of the TS packet buffer implemented in the modulator Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com The modulator can be configured to generate any of the transmission modes listed in the DVB T specification In hierarchical modes the HP and LP streams can be encoded with different convolution code rates The channel bandwidth can be set by the user to 6 7 or 8 MHz as required by the application Several test modes are available in the MO 160 blanking of carriers single tone output test TS generation CBER and VBER injection The modulator is frequency agile The user can select an RF output frequency between 470 and 875 MHz in steps of 1 Hz In normal operation the IF output frequency is internally set by the modulator and varies between 32 and 36 MHz depending on the selected RF frequency The RF output can be switched off in which case the IF frequency is fixed at
40. umber of carriers in the COFDM ensemble The modulator has these options 2K 8K Spectral Inversion This function allows inversion of the spectrum generated in IF and RF As the IF spectrum is by itself inverted compared to the RF output the inversion applied is related to the RF output The possible options are OFF Carriers with lower indices occupy the lower frequencies of the RF channel ON Carriers with higher indices occupy the lower frequencies of the RF channel PRBS bits Selection of the length in bits of the internally generated pseudorandom sequences 23 PRBS sequences of length 223 1 as documented in TR 101 290 15 PRBS sequences of length 215 1 as documented in TR 101 290 TS sync mode Selects the mode of operation of the modulator with respect to the incoming TS see section 1 2 for further details Master Slave Slave mode TS lock In slave mode this selects the TS input to which the modulator locks its internal clock Options are HP The modulator is synchronised with the HP TS LP The modulator is synchronised with the LP TS hierarchical modes only 02 2008 e Test Opt Selects the test to be carried out Available options are NONE Normal COFDM output Inject channel bit errors to obtain a non zero BER before the Viterbi decoder Channel BER VBER Inject bit errors to obtain a non zero BER after the Viterbi decoder Viterbi BER or simply BER Blank carriers Blank c
41. utput BW d as before 02 2008 Name Message____ Answer______ Description and Format Sets the modulator hierarchy mode d decimal digit 0 NO 1 a 1 2 a 2 3 a 4 MHI cr MHld lt cr gt Asks for the current hierarchy mode as before MTPd lt cr gt Sets the modulator test mode d decimal digit 0 NONE 1 CBER 2 VBER 3 BlkCar 4 PILOTS 5 PRBS Asks for the current test mode 2MTP lt cr gt MTPd lt cr gt as before lt gt Sets the modulator TS high priority code rate d decimal digit O 1 2 3 2 3 4 3 5 6 4 7 8 A Asks for the current CR for the high priority TS HCR cr HCRd lt cr gt d as before LCRa lt cr gt Sets the modulator TS low priority code rate d decimal digit O 1 2 3 2 3 4 3 5 6 4 7 8 LCR lt cr gt LCRd cr Asl s for the current CR for the low priority TS d as before MCOd lt cr gt Sets the modulator constellation d decimal digit 0 QPSK 1 16QAM 2 64QAM 2MCO lt cr gt lt gt Asks for the current modulator constellation d as before MGUa lt cr gt Sets the modulator guard interval d decimal digit 0 1 4 1 1 8 2 1 16 3 1 32 2MGU lt cr gt MGUd lt cr gt Asks for the current modulator guard interval d as before FFTd lt cr gt Sets the modulator FFT mode d de
Download Pdf Manuals
Related Search