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USER

 

MANUAL 

MPD-1611291-A

 

 

 

 

 

EXACT-V2 High End Rack Modulator / Exciter

 

 

3/10/2017 

                         MPD-1611291-A

 

Page 22/94 

 

 

2.6.1

 

Digital Adaptive Precorrection 

 

The Digital Adaptive Precorrection (DAP) block is illustrated here below. 

 

 

Figure 6: DAP integration block diagram 

 

The DAP function is composed of Non-Linear and Linear Precorrection and a dedicated 

down-converter. The down-converter receives the signal feedback after the external 

amplifier (FBA_In) and after the RF filter (FBF_In). Then, a particular algorithm 

processes the digital IQ samples to reduce the signal distortions at the transmitter 

output. 

 

To monitor the DAP process several statuses are available: 

 

MER indicative measure 

 

PAPR indicative measure 

 

Measured left and right shoulder levels 

 

DAP elapsed time 

 

DAP status: Active, Stopped by user, Stopped by timer, Failed 

 

2.6.1.1

 

Non-Linear Adaptive Precorrection 

 

EXACT-V2 performs non-linear precorrection over a 75 MHz bandwidth. The purpose of 

non-linear precorrection is to correct the distortion from the power amplifier. With the 

feedback  from  the output amplifier, an adaptive non-linear precorrection should 

automatically find  the best precorrection and follow  the variations of the amplifier 

characteristics. 

 

Four operating modes are available: 

 

•

 

STATIC (EDIT) mode: The DAP is disabled. The user can load a previous DAP 

configuration to be applied to the modulator.  

Содержание EXACT-V2

Страница 1: ...Document Reference MPD 1611291 A...

Страница 2: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 2 94...

Страница 3: ...7 Output Processing 26 2 7 1 RF output muting and RF maintain features 26 2 7 2 Crest Factor Reduction Management 27 2 7 3 DAP Operation 30 2 8 Clock and Synchronization 32 2 8 1 GPS and clock manage...

Страница 4: ...Configuration 67 5 Operation 71 5 1 Operation Generalities 73 5 1 1 Local Operation 73 5 1 2 Remote Operation 73 5 2 Embedded Web GUI Description 74 5 2 1 Requirements 74 5 2 2 Connection to EXACT V2...

Страница 5: ...t any time without prior notice in order to improve design and supply the best possible product Copy warning This document includes some confidential information Its usage is limited to the owners of...

Страница 6: ...20dBm output DAP and onboard GPS EXACT ATSC 3 VP EXACT ALP3 ATSC 3 0 software license Single PLP ALP software license 3 0 Document structure Chapter 1 System Overview This chapter gives an overview of...

Страница 7: ...tandards html Table 1 Relevant standards for ATSC A6 Physical Layer Protocol A 322 http atsc org standards atsc 3 0 standards A7 Link Layer Protocol A 330 http atsc org standards atsc 3 0 standards Ta...

Страница 8: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 8 94...

Страница 9: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 9 94 1 System Overview...

Страница 10: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 10 94...

Страница 11: ...advantage of ATSC 3 0 technology The clock system has been carefully designed to reach a very low phase noise and it achieves the flexibility required to operate with different synchronization scheme...

Страница 12: ...r all of the supported standards 1PPS and 10MHz external reference signals are available to reach a higher frequency accuracy An on board GPS receiver is also available and may be used for this purpos...

Страница 13: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 13 94 2 Features Summary...

Страница 14: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 14 94...

Страница 15: ...o Null packet deletion ATSC framing and channel encoding o 8 VSB modulation core o Virtual Channel Table Update ATSC 3 0 Available from the S110 firmware version Digital Adaptive Non Linear Precorrec...

Страница 16: ...ut power to ensure a stable system output power o Feedback input using direct adapted RF signal from amplifier output 10dBm or VDC signal from external power sensor Control and Management o Control an...

Страница 17: ...being used the Equalizer should be turned off 2 3 Input Stream Management The Stream Management consists in routing the incoming data from the ASI SMPTE or the Ethernet interface towards the modulatio...

Страница 18: ...on a programmable consecutive error threshold Once it is reached the stream selection switches automatically from the primary input to the secondary When the valid packets threshold is reached the str...

Страница 19: ...st selects the desired standard using a simple command In ATSC 1 0 VCT Virtual Channel Table updates allows the user to change the major channel number and carrier frequency In ATSC 3 0 Available from...

Страница 20: ...Linear precorrection for compensating the distortion due to the channel filter o Non linear precorrection in order to cope with the power amplifier distortion Digital precorrection can be adaptive run...

Страница 21: ...nce and efficiency but also in order to save on technician time However when several RF signals are combined together adjacent channels the use of Linear DAP is not possible because the feedback signa...

Страница 22: ...ter output To monitor the DAP process several statuses are available MER indicative measure PAPR indicative measure Measured left and right shoulder levels DAP elapsed time DAP status Active Stopped b...

Страница 23: ...s stopped either by a timer value user configurable or manually stopped Figure 7 Single DAP mode operation SURVEY DAP In this mode the DAP process is started as the Single DAP mode Once the timer is r...

Страница 24: ...n correct up to 3dB range 3dB to 3dB in amplitude and up to 3 s range 0 to 3 s in group delay With the feedback after the output filter an adaptive linear precorrection should automatically find the c...

Страница 25: ...aptive Linear pre correction for sharp channel filters in ATSC 1 0 With specific sharp tuned filters the EXACT V2 Linear DAP algorithm could fail Generally the complexity of the channel filter is due...

Страница 26: ...s available on the RF Monitor This output signal is the same as the main RF Out signal but with a lower level 20dB for the 0dBm exciter and 43dB for exciter with optional 20dBm internal preamp 2 7 1 R...

Страница 27: ...receiver 2 7 2 Crest Factor Reduction Management PAPR Peak to Average Power Ratio issues are associated with high power peaks present in the signal By correctly managing PAPR reduction Crest Factor r...

Страница 28: ...arameter impact on a signal Crest Factor setting 20dB No reduction Without any crest factor reduction the PAPR is 14 4dB Crest Factor setting 11dB After the adjustment PAPR is 10 8dB Note In the scree...

Страница 29: ...e shows the variation of the shoulder level and the MER for different parameter values at a given crest factor When the Crest Factor Optimization parameter is increased the shoulder level becomes bett...

Страница 30: ...lipping the signal out from the modulator 2 7 3 DAP Operation DAP stands for Digital Adaptive Precorrection it is an option allowing the user to run the EXACT V2 in a very high end mode in order to re...

Страница 31: ...he Settings Tab the DAP mode can be enabled under Outputs Precorrections Non Linear DAP launch The same protocol as the basic DAP applies please refer to the previous chapter Note Enabling or disablin...

Страница 32: ...board GPS or external 1PPS o Internal The module delivers a 10 MHz clock reference output signal and can also provide 1PPS if the user configures the 1PPS IN OUT connector as an output For VX20 x0x2...

Страница 33: ...on the user s setup three cases can be considered 1 Working with external GPS signal reference using on board GPS receiver Figure 14 VX20 x0x2 clock synchronization GPS signal In this case the modula...

Страница 34: ...available on the 1PPS I O interface This 1PPS reference signal is used for both temporal synchronization and 10 MHz PLL locking 3 Working with external 10 MHz and external 1PPS reference Figure 16 VX...

Страница 35: ...s in any case 2 8 3 Loss of Reference Signal management LORS In SFN an accurate clock synchronization is very critical for ensuring a good SFN operation For this purpose the module implements the foll...

Страница 36: ...s locked This optional functionality allows having the best accuracy on time reference PPS used for SFN systems The external references have to follow the recommendations specified in the interface de...

Страница 37: ...module will mute if the Clock Synchro is still not OK Figure 18 Mute behavior LORS TimeOut is not reached 2 9 Power Measurements EXACT V2 provides the capability to measure the forwarded and reflected...

Страница 38: ...ximum warning and alarm thresholds for both forward and reflected power can be set via WEB GUI by the user for error management and monitoring 2 10 Automatic Gain Control AGC EXACT V2 provides a built...

Страница 39: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 39 94 3 EXACT V2 Rack...

Страница 40: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 40 94...

Страница 41: ...nt panel Figure 22 Front panel overview The front panel is composed of an LCD screen display with six buttons four navigation buttons up down left and right arrows one OK green button and one Cancel R...

Страница 42: ...terconnection with the exciter Please refer to the next section for a detailed description 3 2 Interface characteristics The product interface are as follows Stream input interfaces x 2 General Functi...

Страница 43: ...erface Electrical Gigabit Port Data Control x 2 General Function Gigabit Ethernet Port Standards Ethernet IP Connector Name Gigabit1 Ctrl Gigabit2 Connector Type RJ 45 Type Input output Performances D...

Страница 44: ...ystem Gain 10 dB Frequency 1575 42 MHz Figure 28 GPS antenna input Clock reference input x 1 General Function Frequency reference input Name 10 MHz_IN Connector BNC 50 Type Input Performances Frequenc...

Страница 45: ...VTTL TTL input LVTTL output 50ns input tolerance Figure 31 1PPS reference input output x 1 General Function Standards Name Connector Type RF output ATSC 1 0 ATSC 3 0 RF N connector 50 Output Performan...

Страница 46: ...0 ATSC 3 0 RF N connector 50 Output Performances Frequency Bandwidth Level ATSC 1 0 EVM Shoulders Spurious ATSC 3 0 MER Shoulder Spurious VHF 54 88 MHz VHF 170 216 MHz UHF 470 862 MHz 6 MHz 20 dBm 2...

Страница 47: ...Type Output Performances Frequency See RF Output Level 20 dB relative to RFout Other Monitoring Output with OPT 20dB internal preamplifer x 1 General Function Monitoring output Standards ATSC 1 0 ATSC...

Страница 48: ...Bm Max input level 5dBm before damage Return loss 13dB Figure 34 Feedback inputs Forward Power Measure Input AGC x 1 General Function Forward Power Measure Standards Name FWP In Connector SMA 50 High...

Страница 49: ...ed Power Measure Standards Name RFP In Connector SMA 50 High impedance Type Input Performances RF input Frequency Depends on model Range 0 to 10dBm Precision 0 5dB typical Max Input Level 5dBm before...

Страница 50: ...No parity 8 bits data 1 bit stop PIN Name Dir 1 RS232 Tx Out 2 Rfu 3 TOD Rx In 4 RS232 Rx In 5 GND 6 RS485 Rx In 7 RS485 Rx In 8 RS485 Tx Out 9 RS485 Tx Out Shield GND Figure 37 TOD RS232 Port The in...

Страница 51: ...3_ Normally_Open Open when active alarm 5 GND cathode of the opto coupler diode 6 RELAY1_COM 7 RELAY2_ Normally_Open Open when active alarm 8 Anode of the opto coupler diode through 330 ohms resistor...

Страница 52: ...econdary input is OK in auto mode Green static Primary input is OK 1 4 Output Green off no RF output module failure or mute condition Green static the RF output is available normal mode Green flashing...

Страница 53: ...ntenna input This cable must be securely connected to the ground before switching on the equipment 3 5 Performances and technical characteristics 3 5 1 General characteristics Characteristics Typical...

Страница 54: ...D LxD SMPTE 2022 MPEG TS Packet Length 188 bytes 3 5 3 Serial control interfaces Control interfaces Typical Value Comment RS232 Standard RS232 TX and RX signals only Limited to the use for TX control...

Страница 55: ...t or Burst mode 188 bytes DVB ASI SMPTE 310M Maximum Useful Bit Rate 19 39 Mbps DVB ASI SMPTE 310M Max Input Jitter 100 ms Input Impedance 75 ohms Return Loss 15 dB up to 270 MHz TS or T2 MI Processin...

Страница 56: ...ot level EXACT V2 EXACT V2 20dB at 20 dBm EXACT V2 20dB at 17 dBm Spurious 50 dBc Relative to the total power of the signal at nominal output power Amplitude Ripple 0 2 dB typical Group Delay Ripple 2...

Страница 57: ...15 dBm Frequency 10 MHz 0 6 ppm External 1 PPS Reference Input Level LVTTL level 5 kohms Min Pulse Width 1 s 10 MHz Reference Output 0 dBm 3 dB 1 PPS Reference Output Level LVTTL Pulse Width 100 ns Ch...

Страница 58: ...Full Temperature Range 5 10 9 0 50 C Tuning 0 6 ppm Short Term Stability 1 10 11 Over 1 s 10 s Aging 5 10 10 day 7 5 10 8 year 5 10 7 15 years Synchronization Cases Stability Aging External_10MHz_Loc...

Страница 59: ...Step Size Accuracy 470 to 862 MHz 170 to 240 MHz 54 to 88 MHz 1 Hz 0 2 Hz Impedance 50 ohms Output Level Main Signal Stability Return Loss Attenuation Range Attenuation Step Monitoring Signal Relative...

Страница 60: ...ion Linear Precorrection Amplitude Group Delay 32 points 3 dB 0 1 dB step 500 ns 10 ns step On the overall bandwidth Adaptive Precorrection Linear Adaptive Precorrection Amplitude Group Delay 3 dB 0 1...

Страница 61: ...surement Bandwidth Full bandwidth Measurement Calibration Configurable Coupler Gain 0 to 100 0 dB Gain Step 0 1 dB Configurable Probe Offset 32768 mV to 32767 mV Offset Step 1 mV Configurable Probe Sl...

Страница 62: ...product It Shows that we have checked that this product meets safety health or environmental requirements Is an indication of a product s compliance with legislation Allows the free movement of produ...

Страница 63: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 63 94 4 EXACT V2 Installation...

Страница 64: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 64 94...

Страница 65: ...llation and Recommendations Install the unit in the appropriate location using four rack mounting screws not included as shown in the following figure Figure 40 Chassis installation Notes Mechanical m...

Страница 66: ...he unit is integrated in an equipment cabinet sufficient space must be left on the right and left side of the unit to allow sufficient air flow 4 3 Wiring and Powering on Once fixed in a location the...

Страница 67: ...ique address Address 192 168 0 211 Subnet 255 255 255 0 Gateway 192 168 0 254 DHCP OFF Gigabit 7 Front Panel Control not changed by default command MAC address module unique address Address 192 168 0...

Страница 68: ...t OFF TS CleverSwitch Auto_Switch_Back Packet error threshold Packet valid threshold Enabled Disabled 5 80000 ATSC signalization 8 VSB ASI management unit Bit rate adaptation Enable Major Channel numb...

Страница 69: ...Linear DAP Mode Non Linear DAP Mode Static DAP is disabled Static DAP is disabled Linear DAP Time_Out Non Linear DAP Time_Out 20 min 10 min Primary Clock Internal Secondary Clock Internal PPS Source O...

Страница 70: ...Opening Triggers Output error Alarm error RF Switch Monitoring Disabled Transmitter Control Disabled Note different set of parameters are used for Single Carrier modulation ATSC and OFDM modulation f...

Страница 71: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 71 94 5 Operation...

Страница 72: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 72 94...

Страница 73: ...eration The product can be controlled using any web browser It allows the user to control monitor and maintain the unit Below are the system requirements PC using a Pentium 1GHz or higher microprocess...

Страница 74: ...IP Port Add To access any settings of the EXACT V2 unit a login is required There are 3 logins o User Guest Only monitoring of the equipment is allowed o Maintenance Minor changes are allowed like te...

Страница 75: ...neral Overview Area 1 is the header of the main window It presents the login logout functions as well as equipment identification Area 2 is the main window It presents either the parameters settings o...

Страница 76: ...1611291 A Page 76 94 5 2 4 Settings Tab The Settings tab can be accessed by clicking on the Settings header The left part of the screen describes the settings menu while the right part presents each...

Страница 77: ...77 94 A message in the main window header allows the user to verify if the settings have been modified and not applied The Apply button appears to confirm the application If any change must be discar...

Страница 78: ...5 2 5 Monitoring Tab The Monitoring tab can be accessed clicking on the Monitoring header It is divided into 2 independent screens to allow the user to monitor two different blocks To select a block...

Страница 79: ...or that occurred on the product To access to the Log File window please press the envelop Then the log file window is displayed 5 3 Front Panel Menu Description Main settings can be accessed from the...

Страница 80: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 80 94...

Страница 81: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 81 94 6 Maintenance Troubleshooting...

Страница 82: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 82 94...

Страница 83: ...ervice comarktv com or by calling 800 345 9295 For each software version available a unique file customer pack has to be provided by Hitachi Comark It is labeled as EXACT H100 S112 zip where EXACT V2...

Страница 84: ...Output and Alarm LED indicators Name Description Power Green off power off Green fix power on Input Green off Primary input is not detected in manual mode or primary and secondary input is not detecte...

Страница 85: ...o The type hardware and software version and Serial number of the equipment o The delivery date of the equipment o Symptoms of the breakdown or a description of the problem HITACHI COMARK CUSTOMER SU...

Страница 86: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 86 94...

Страница 87: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 87 94 Appendix A GPS Installation Recommendations...

Страница 88: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 88 94...

Страница 89: ...the covered area Ga as the gain of the dedicated GPS antenna Gc as the losses of the several RF components cable connectors Gt as the total Gain of the RF chain Gt Ga Gc The user shall respect the fol...

Страница 90: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 90 94...

Страница 91: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 91 94 Appendix B Example of GPS Antenna...

Страница 92: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 92 94...

Страница 93: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 93 94...

Страница 94: ...USER MANUAL MPD 1611291 A EXACT V2 High End Rack Modulator Exciter 3 10 2017 MPD 1611291 A Page 94 94...

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