User Manual. DVB-T Exciter

Transcription

1 User Manual DVB-T Exciter 1

2 The present design is property of Eurotek s.r.l. and is protected by Copyright. Its reproduction, distribution and disclosure to third-parties without written authorisation is forbidden Every reproduction, re-distribution or disclosure without prior written authorisation is expressly forbidden by the law and can lead to serious civil and penal sanctions Rev. D Arch /03/2017 2

3 Warning! The socket utilized for the unit supply must have the appropriate ground conductor. The connection of the unit, to a socket without the ground conductor, will make the whole equipment dangerous for people safety. About the repairing of the units please refer to specialized personnel only. Inside the devices there are voltages which could be dangerous to people. Before opening the cover switch off the unit, disconnect the connection and the supply cables. In case of electrical shock please follow the instructions of first aid listed on page 4 Substitute the fuses interrupted with others of the same type and voltage. The waste disposal of the devices must be executed in the respect of the enforced laws in the country uses. Eurotek not assumed responsibility for waste disposal in contrast with enforced laws. LIFE SUPPORT APPLICATIONS. Eurotek s products are not designed for use as critical components in life support devices or system without the express written approval of the Eurotek S.r.l. As used herein. - Life support devices or system are devices or system which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. - A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. The information given in this documentation could have variations without forewarning. The firm Eurotek S.r.l. does not give any guaranty about this documentation. The firm Eurotek S.r.l. does not consider itself responsible for possible mistakes which could be found in this documentation. 3

4 First aid: artificial breathing(mouth to mouth) In case of electric shock you have to ensure the first aids to the patient, but to do this you have to consider two very important things: - interrupt immediately the electric circuit; - if the circuit has not been interrupted, do not touch the patient with bare hands; After doing this, without delay contact the nearest mobile unit of first aid and practice to the patient, in case of loss of consciousness, the breathing mouth to mouth as described below. Put the patient lying on his back with the arms parallel to the body, ensure that he does not have the breathing tracts obstructed (chewing-gum, dental prosthesis, etc.), otherwise set him free from foreign bodies. Kneel near the patient s head and putting a hand under his neck, incline as possible his/her head backwards. Going on with keeping the patient s head inclined with one hand, use the other one to occlude the nostrils, if you are going to practise the breathing through the oral cavity, or occlude the mouth if you want to do it through the nasal cavity. While doing this begin the auto-oxygenation, with deep breathing. Then practice the artificial breathing blowing in the chosen cavity beginning with ten expirations each minute to go on them with twelve and fifteen. 4 During the breathing procedure you have to control that the patient s chest dilates, otherwise change cavity where to blow the air because the previous one could be obstructed. 5 Do not ever stop the artificial breathing until the patient has recovered or the first aid unit has come Rev. D Arch /03/2017 4

5 INDEX INDEX GENERAL DESCRIPTION Input section Reference and Oscillator section Modulator section Analog section AGC section Controller section AGC SETTING PROCEDURE TECHNICAL SPECIFICATIONS BOARD PANEL BOARD PANEL REPRESENTATION BOARD PANEL DESCRIPTION BOARDS MENU MENU STRUCTURE MENU DESCRIPTION AND KEYBOARD GUIDE

6 1. GENERAL DESCRIPTION The works as DVB-T modulator. The board allows to obtain the digital modulation in according with the DVB-T standard transport stream transmission. The next page shows the block scheme. We can split up the block scheme reported in fig 1.1 into different section below depicted: Input section. Reference and Oscillator section. Modulator section. Analog section. AGC section. Controller section. FIG Rev. D Arch /03/2017 6

7 1.1.1 Input section FIG. 1.2 The board is composed by four input. The ASI 1 and ASI 2 are physical input represented by the BNC connector located on the board panel (see chapter 2). The maximum transport stream bit rate for this inputs is 216 Mbit/sec. The INT MPX and INT DEC are two internal input directly connected to the internal matrix line of the EK-MFR/1 (see EK-MFR/1 user s manual). The maximum transport stream bit rate for this inputs is 54 Mbit/sec. Like the figure 1.2 shows, every transport stream input is processed by two block: PID DETECTOR and PACKET FILTER. The PID DETECTOR verify that the PID of the NIT,MIP and PAT tables are allocated in the transport stream. If one of this PID is not present an alarm occurs. The PACKET FILTER, in MFN mode, allows to delete the stuffing packets present on the transport stream, so after the PKT FLT block it is possible to read the real transport stream bit rate.(every input have a bit rate meter associated). ASI 1, ASI 2, INT MPX, INT DEC are connected to the input mux. The user, by the menu, can set the in variable to determinate which of the four input must be selected to use. 7

8 1.1.2 Reference and Oscillator section FIG. 1.3 Each DVB-T transmitter needs an univocal time reference to be synchronized into a symbol fraction. To do this the 1pps of a GPS signal can be used. The GPS receiver block (RX GPS), receives the signal from the GPS IN connector (see chapter 2) While the GPS receiver is correctly locked an accurate timing signal is provided at its 1pps output (1pps_GPS), moreover GPS_fix output is set to high so the 1pps signal is carried out to the EK_MFR in order to be used by other boards (1pps_out). The Sat variable located in the Status menu of the board gives information about the number of the received satellites. The 1pps can be taken from two other sources: an internal reference INT (MFN mode only) or an external reference (EXT) such as the 1pps signal coming from another board. A detector (Det) checks the presence of the incoming external 1pps. To select which signal to use as reference to synchronized the transmitter, a variable Ref can be set by the menu (see 3.2). The alarms management, respect to selected reference (Ref), is explained in the table below. Ref GPS IN EXT Ref State GPS X - No GPS Ref! Ext - X No Ext Ref! Int - - Int OK Auto X No GPS Ref! Auto X No Ext Ref! Auto X X No Refs! Note: - = any condition, = present signal, X= absent signal The oscillator section allows to lock the 10 MHz frequency generated by the VCXO to the 1 pps reference. The 10 MHz reference clock is also used to lock the PLL in the local oscillator generation (see analog section 1.2.5) Rev. D Arch /03/2017

9 1.1.3 Modulator section TS FIG. 1.4 The signal coming from the input mux is processed to substitute the Network Information Table in the MFN mode allowing the change of the parameters of the incoming table. The PCR block also used in the MFN mode adapts the bit rate at the outgoing value and also restamp the PCR with the calculated value due to the time shift needed for the packet stuffing. The OFDM modulator generates the symbols processing the TS in respect of ETSI EN , on the TPS are added all the flags regarding modulation value, cell id and so on. A separated block allow the synchronization of the modulator to generate the frame exactly in the moment needed for the SFN operation, the DDR2 memory store the incoming transport stream for the time needed to respect and follow the Maximum delay parameter contained in the Megaframe Insertion Packet. The microprocessor add to the Maximum delay value also the value eventually contained in the Time offset function coming from the MIP, this value represented in the menu as "Ofs" is settable also manually but it takes again the value from the MIP if the function for this Tx Id is transmitted. The "Dyn" value represents the actual delay value inserted by the to transmit the symbol at the requested time. On the output of the OFDM modulator are present the I and Q signals that are sent to the precorrector block. This block allows to compensate the amplitude and phase non-linear distortion introduced by the amplifiers chain, the K values allow for the compensation of the amplitude and the P for the phase. 9

10 1.1.4 Analog section FIG. 1.5 The I and Q signal coming from the modulator section are digital to analog converted first and then low pass filtered to obtain the base band frequency signal BB (0 to 4MHz). The BB signals are mixed with the OL signal coming from the PLL, its frequency is related to the output frequency set with the Tx variable. At the out of the mixers the two RF component (0 and 90 ) are combined to obtain the output RF signal Rev. D Arch /03/

11 1.1.5 AGC section FIG. 1.6 This section allows to control and power out level of the board. The microprocessor controls the gain of the output amplifier in respect of several parameters. Two true RMS detector are present to allow this behavioural that is describet in the 1.3 parag. 11

12 1.1.6 Controller section FIG. 1.7 It is possible to obtain a complete view of the status of the board thanks to the Controller section. Every variable of every menu of the board can be set by the user and the status of this variable is in real time controlled. When an alarm occurs, the controller shows the name of the variable in alarm on the EK-MFR/1 display Rev. D Arch /03/

13 1.2 AGC setting procedure FIG. 1.8 In order to control the power level and to avoid damage to the external amplifier it is very important to apply the follow procedure: 1) Verify that: Amplifier nominal power[dbm] > ( 15dBm + Amp[dB] ) 2) If not verified adjust Amp[dB] in order to satisfy point 1) 3) Assure that the amplifier module is correctly connected to the antenna and turned off. 2) Switch on the EK-MFR/1 and set the board variables as follow: Out lev = -15 dbm Mode = RF Off Max lev = 0 dbm Thres = -20 db Tx = desired frequency 4) Connect the board with the external amplifier module: The SMA TX connector with the RF input of the amplifier The SMA DET connector with the monitory output of the amplifier 5) Turn on the amplifier. 6) Set the Mode parameter to the Int value. 13

14 7) Adjust the Out lev parameter to obtain, on the output of the amplifier the desired power value. 8) Read the value of the Out and Det parameter (see Status menu). 9) Set the Mode parameter on the RF Off value. 10) Set the Out lev at the same value of the Det parameter detected on the point 8). 11) Set the Max lev value (Out lev + 1 db usually) 12) Set the Mode parameter on the Ext value. 13) Wait until the AGC is correctly regulated (Det = Out lev). The board driving correctly the amplifier, the power out is constant maintained. 14) Set the Thres (Option). This option allows to check the amplifier gain variation respect to the normal operation. When a functional problem occurs and the amplifier gain decreases significantly, the output level is reduced automatically in order to prevent a damage on the amplifier. The Thres parameter is the threshold level and when is set to 20 db the threshold option is disabled. To enable this option the user can set a value included in the range [ 19.9 : +15 db], and the proper threshold value can be calculated using the following formula: Thres = Det Out X. where: Det = monitory output level amplifier (detected on point 8). Out = output level of (detected on point 8). X = maximum allowed variation of amplifier gain respect to the normal run (positive number expressed in db). Note : these value must be taken during the normal run. When the threshold level is passed, the reduces the Max lev automatically value by 6 db and the Thres alarm is displayed in State of Status menu Rev. D Arch /03/

15 If the Amplifier supplies a signal to squelch the exciter during alarms and power on it is possible to use Condition Builder (from the Eurotek Software Suite) to switch off the RF (see the next example). We suppose that the amplifier connected to the board, supplies a voltage signal that, if it is < of 5V means that the amplifier is in fault condition, so it is necessary to switch off the RF signal of the board to preserve the amplifier module. FIG. 1.9 It is necessary to connect the voltage supplied by the amplifier and the relative ground, to the EK- PWS/x board of the EK-MFR/1. Like the figure 1.10 shows the voltage signal must be connected with the pin number 17 (Volt in 1) of the 25 sub-d connector. The ground must be connected with the ground of the EK-PWS/x (pin 16). (See EK-PWS/x user s manual, Auxiliary connector). So, the EK-MFR/1 can read the Voltage value coming from the Amplifier (see EK-MFR/1 user s manual, Miscellaneus menu => Volt in 1). Now using the Eurotek Condition Builder software, it is possible to switch off the RF signal of the in according with the value displayed on the Volt in 1 field. 15

16 When the Condition Builder software is launched the following window appears. In the top righ angle of the window, the user must the: Target Board = Target Param = Mode Set Target to = EXT (AGC in manual mode) Comment = user s comment (No Alarm for example) In this manner, the board works in manual AGC during normal working condition (Mode = Ext). Now the user must insert the condition to control the RF switch off Rev. D Arch /03/

17 To do this,it is necessary to click the Add Condition label on the top left of the window. Now the user must to specify the which variable event must be used to control the Target board parameter: Slot = Main (EK-MFR/1) Parameter = Volt in 1 IF From = 0.0 To = 5.0 Set target to = RF Off Comment = Amp Alarm (for example) Click on the Apply button to confirm the settings. With the above setting, the RF signal of the is switched off when the Volt in 1 variable is included in the range 0V 5V. This condition could be modified or other conditions could be added upon customer needs. 17

18 1.3 Technical specifications ASI GPS RF RMS Detector Input Stream type = ISO / IEC ASI Data-Rate = Mbit/s Internal Data-Rate = 1-54 Mbit/s ASI Reference = EN ELECTRICAL Connector = BNC FEMALE 75 Ohm Antenna supply Voltage = 5V Max. allowed current = 50 ma Input impedance = 75 Ohm Connector = F FEMALE Output Level = dbm Frequency range = MHz Connector = SMA Female Input Level = dbm Frequency range = MHz Connector = SMA Female Rev. D Arch /03/

19 2. BOARD PANEL 2.1 board panel representation 2.2 board panel description A) RF output connector (SMA) B) Detector output connector (SMA) C) ASI 2 input connector (BNC) D) ASI 1 input connector (BNC) E) GPS input connector (F) F) RF input connector (option) (SMA) 19

20 3. BOARDS MENU 3.1 menu structure The complete menu of the board is depicted on end Variable name Variable number 1 >Status >>Out 2 >>Det 3 >>VXCO 4 >>State 5 >>Out HP 6 >>Out LP 7 >>Ref State 8 >>Sat 9 >>Asi 1 10 >>Asi 2 11 >>Int Mpx 12 >>Int Dec 13 >>Board Temp 14 >Settings >>Delay >>>Max 15 >>>Ofs 16 >>>Ek 17 >>>Dyn 18 >>DVB-T >>>Tx 19 >>>Ref 20 >>>SFN 21 >>>GPS timeout 22 >>>Bw 23 >>>Const 24 >>>G Intl 25 >>>Carr 26 >>>HP VR 27 >>>LP VR 28 >>>Hier 29 >>>Intlvr 30 >>Cell Id >>>En 31 >>>Nr Rev. D Arch /03/

21 >>>Tx Id 33 >>DVBH >>>Time Slice 34 >>>Mpe Fec 35 >>Port Sel >>>HP in 36 >>>LP in 37 >>>Flt Pid 38 >>>Vc 39 >>>In Mode 40 >>AGC >>>Out lev 41 >>> Mode 42 >>>Max lev 43 >>>Thres 44 >>Set up >>>Supp I 45 >>>Supp Q 46 >>>Quad 47 >>>Imb 48 >>>Tilt 49 >>>Bend 50 >>K1 51 >>K2 52 >>K3 53 >>K4 54 >>K5 55 >>K6 56 >>P1 57 >>P2 58 >>P3 59 >>P4 60 >>P5 61 >>P6 62 >Revision >>DSP 63 >>FPGA 64 >>CPLD 65 >>RamDisk 66 21

22 3.2 menu description and keyboard guide The content of each menu is here described. Each variable value can be set using the modifing variable keys (EK-MFR/1 manual, Board panel description) and to confirm the change pressing the enter key. >Status The Status menu is a read only menu. The user can read the information about the board status, accessing the following EK-MFR/1 sub-menu: >>Out >>Det Returns the output power level [dbm] detected on the RMS detector coupled with the Output TX (see fig 1.1 ) Returns the detector power level [dbm] detected on the RMS detector coupled with the Detector output (see fig 1.1 ) >>VXCO Corr Indicates the value of correction applied to the High stability internal Voltage controlled crystal oscillator, the value is in the range 1 / +1, more close is to the limits more probable is an unlock, value in the range 0.5/+0.5 are in the normal range. The label Ref Unlocked appears when the Reference 1pps signal is not locked. >>State When it is OK the board is in normal working condition. If an alarm occurs, the the State returns the variable in alarm. >>Out HP Display the modulator transport stream bit rate [Mbit/sec.] for the HP stream. >>Out LP Display the modulator transport stream bit rate [Mbit/sec.] for the LP stream. >>Ref State Indicates the status of transmitter synchronization to a reference signal, in according with the value set in the Settings>DVB-T>Ref. When an alarm occurs, there are different fault conditions: No GPS Ref = The GPS reference signal is missing. No Ext Ref = The Ext reference signal is missing. No Refs = Both GPS and Ext reference signals are missing Rev. D Arch /03/

23 >>Sat Returns the number of the satellites received by the GPS receiver module that should be more than 6. >>ASI 1 Indicates the status of the transport stream present on the ASI 1 input BNC connector. When no alarms occur, the display shows the transport stream bit rate (normal working condition). When an alarm occurs, there are different fault conditions: Asi CD = The transport stream carrier is missing. Asi Error = The transport stream is corrupted. Ts in Unlock = The transport stream is unlocked (Sync byte missed or corrupted). NO PAT = the incoming stream doesn t contain Program Allocation Table NO MIP = the incoming stream doesn t contain Megaframe Insertion Packet (only in SFN mode) >>ASI 2 Indicates the status of the transport stream present on the ASI IN 2 input BNC connector. When no alarms occur, the display shows the transport stream bit rate (normal working condition). When an alarm occurs, there are different fault conditions: Asi CD = The transport stream carrier is missing. Asi Error = The transport stream is corrupted. Ts in Unlock = The transport stream is unlocked (Sync byte missed or corrupted). NO PAT = the incoming stream doesn t contain Program Allocation Table NO MIP = the incoming stream doesn t contain Megaframe Insertion Packet (only in SFN mode) >> INT MPX Indicates the status of the transport stream present on the internal line connection. When no alarms occur, the display shows the transport stream bit rate (normal working condition). When an alarm occurs, there are three different fault conditions: Ts in Unlock = The transport stream is unlocked (Sync byte missed or corrupted). NO PAT = the incoming stream doesn t contain Program Allocation Table NO MIP = the incoming stream doesn t contain Megaframe Insertion Packet (only in SFN mode) >> INT DEC Indicates the status of the transport stream present on the internal line connection. When no alarms occur, the display shows the transport stream bit rate (normal working condition). When an alarm occurs, there are three different fault conditions: 23

24 Ts in Unlock = The transport stream is unlocked (Sync byte missed or corrupted). NO PAT = the incoming stream doesn t contain Program Allocation Table NO MIP = the incoming stream doesn t contain Megaframe Insertion Packet (only in SFN mode). >>Board Temp When this menu is selected, the board temperature is reported ( C). >Settings The Settings menu is a read/write menu. The user can change the next sub-menu parameters. >>Delay >>>Max (read only) Indicates the maximum delay of the SFN network carryed in the in the MIP. >>>Ofs (read/write) Allows to set the local offset for the transmitter.[usec.] overwrited by the MIP function if Tx Id match and Time Offset function present. >>>Ek (read only) It is a delay inserted by the board that allows standard delay. >>>Dyn (read only) The actual delay inserted by the to allow the Megaframe aligned with the other transmitters of the network. >>DVB-T >>>Tx Allows to set the frequency transmitter of the DVB-T modulator. >>>Ref The source of the 1pps reference used to synchronize the transmitter. This reference can be a GPS signal (GPS), an external reference (Ext), coming for example from another board, or an internal reference (Int) when in MFN mode. When Auto is selected, the system automatically selects the 1 pps source to process in according to the following priority: GPS, Ext, Int. >>>SFN When is Enable (En) the is in SFN modality, if it is disable (Dis) the board works in MFN modality. A change of this parameter requires a reboot. >>>Bw This variable indicate the spectrum bandwidth. It is possible to customize the bandwidth to select three different values: 6MHz, 7MHz and 8MHz >>>Const Rev. D Arch /03/

25 It is possible to choose the value for the DVB-T constellation between three different value: QPSK, 16 QAM and 64 QAM. >>>G Int The Guard interval variable allows to set four different values that are following grouped:1/4, 1/8, 1/16, 1/32. >>>Carr This menu allows to configurate the numbers of the carriers for the DVB-T constellation. It is possible to set 2K, 4K or 8K carriers from the board menu. >>> HP VR Allows to set the high priority Viterbi BER. There are five available configurations: 1/2, 2/3, 3/4, 5/6, 7/8. >>> LP VR Allows to set the low priority Viterbi BER. There are five available configurations: 1/2, 2/3, 3/4, 5/6, 7/8. >>>Hier The possible hierarchic value to set are five: No(hierarchichal disable), alfa 1, alfa 2, alfa 3, alfa 4. >>>Intlvr It is possible to set the interleaver on native value or in-depth value. >>Cell Id Gives information about the SFN cell. >>>En Enabled (Y) or disabled (N) the cell id. >>>Nr Cell Id number >>Tx Id Allows the user to set the Tx Identifier number for the transmitter. This value is used to addres the transmitter with the funcions contained in the MIP. >>DVB-H The following parameter are available only when the system works in DVB-H standard. >>>Time Slicing It is possible to enable (Yes) or disable (No) the Time Slicing flag on TPS. >>>MPE-FEC It is possible to enable (Yes) or disable (No) the MPE-FEC flag on TPS. 25

26 >>Port Sel >>>HP In Allows to set from which source input carry out the transport stream to send to the modulator High priority input. ASI 1 = transport stream present on the BNC input ASI 1 (see chapter 2) ASI 2 = transport stream present on the BNC input ASI 2 (see chapter 2) Int mpx = transport stream present on the EK-MFR/1 internal matrix line Int dec = transport stream present on the EK-MFR/1 internal matrix line. Auto = The system automatically selects the input to process in according wiyh the follow priority: ASI 1, ASI2, Int mpx, Int dec. >>>LP In Allows to set from which source input carry out the transport stream to send to the modulator Low priority input.(only when the hierarchical mode is active) ASI 1 = transport stream present on the BNC input ASI 1 (see chapter 2) ASI 2 = transport stream present on the BNC input ASI 2 (see chapter 2) Int mpx = transport stream present on the EK-MFR/1 internal matrix line Int dec = transport stream present on the EK-MFR/1 internal matrix line. >>>Flt Pid PID used to stuff the band that must be removed ro have the original bit rate. >>>Vc The Vc parameter is composed by four number (0 to 9). The 0 and 9 are not available,from 1 to 8 are the virtual channel available. For example if the Vc is 2357 it means that 2 is the Vc related to the Int dec,3 is for the Int Mpx,5 is for ASI 2 and 7 is for ASI 1. This parameter is used when IN Mode is set to Vc. >>>In Mode Select the input modality. Nor: normal mode. Vc: virtual channel mode. Flt : filtered mode. Nor: The incoming transport stream is transmitted as it is. Vc : This mode must be selected only when a EK-MPA/4 board is used at the studio side. Allows to set the virtual channel (VC) value.the software loaded on the EK- DTX/1 board, includes the possibilities to work with the transport stream multiplexed.we suppose that on the ASI 1 input BNC connector is present a transport stream coming from an EK-MPA/4 board (see EK-MPA/4 & EK- DMA/4 user s manual),if the Vc related to the ASI 1 input is set to 4 it means that on the modulator is send the transport strem mapped on the virtual channel 4 of the EK-MPA/ Rev. D Arch /03/

27 Flt mode: we suppose that the input transport stream is stuffed with a non standard stuffing PID (8191), this system allows to filter the non-standard stuffing packets present on the incoming transport stream. >>AGC The AGC menu allows to set the parameter to adjust the board. Refer to AGC section >>> Out lev Output power transmitter level (dbm) >>> Mode Set the AGC modality: Freeze = the value of output power level is stuck. Int = the gain is automatically adjust. Ext = the gain is manually adjust. RF Off = the transmitter is turned off. >>> Max lev Maximum power level (dbm) that the AGC can carry out. >>> Thres Control threshold level that allows to reduce the gain of the automatically(derating). >> Set up The Set up menu is a read/write menu. The user can change the next sub-menu parameters. The parameter located in the Set up menu are related with the modulator section (1.2.4). >>>Supp I Correction for carrier suppression the I signal >>>Supp Q Correction for carrier suppression the Q signal >>>Quad Correction for the Quadrature Error of the modulator >>>Imb Correction for the Imbalance amplitude of the modulator >>>Tilt Set the tilt amplitude for the modulator >>>Bend Set the bend amplitude for the modulator >>>K1 to K6 coefficients for the non-linear amplitude amplifier predistortion. >>>P1 to P6 coefficients for the non-linear phase amplifier predistortion. 27

28 >Revision Gives information about the software releases. >>DSP DSP software release. >>FPGA FPGA software release. >>CPLD CPLD software release. >>RamDisk RamDisk software release Rev. D Arch /03/

29 Eurotek S.r.l. c/o Parco Scientifico Tecnologico e delle Telecomunicazioni in Valle Scrivia Strada Comunale Savonesa, RIVALTA SCRIVIA (AL) tel. +39 (0) r.a. fax +39 (0) info@eurotek.eu 29