MEX II. Multimode TV Exciter HE ANALOG / DIGITAL

Transcription

1 ANALOG / DIGITAL Multimode TV Exciter Fully numerical signal elaboration and modulation Adaptive pre-distorter and pre-equalizer Multi-Standard equipment Dual Cast transmitter Band I Band III Band IV/V Frequency agile in the band HE MODULATOR THE BROADCASTING & TELECOMMUNICATION PIONEER

2 The core of is represented by a new modulator card that implements all the modulation, control and supervision functions. All operations necessary for the generation of a high quality RF signal, in accordance with all analog and digital television standards are completely performed by a Real Time Digital Signal Processing using a FPGA (Field Programmable Gate Array). By loading two different firmware in the memory card, the modulator can operate as Dual Cast, with the possibility to switch from analog to digital transmission with a simple command (local or remote). In addition to the standard ATV and DTV inputs, when the exciter operates in one of the DTV modes, a Giga Bit Ethernet (GbE) port, able to receive up to four MPEG-2 Transport Streams, can be integrated. The exciter can be equipped with a RF receiver with two available inputs to implement the adaptive pre-correction and the transmitter output power measurement (power meter). The receiver can be provided with a DVB-S/S2 tuner, to extract a MPEG-2 transport stream from a satellite link, or with a DTV receiver, to implement a regenerative transposer. The modulator card includes also an input for the measurement of the reflected power. The baseband digital I/Q signal generated by the FPGA is directly converted to RF (bands I, II, III, IV and V) by means of a RF DAC. In DTV mode, a pre-equalization function (to compensate for linear distortions of the output filter) and a predistortion function (to compensate for non linear distortions of the high power amplifier) are available, both using fully automatic adaptive algorithms. HIGH QUALITY RF SIGNAL The exciter is equipped with an internal 10 MHz reference that can be locked to an external one. In case of external reference loss, the system keeps on generating the internal reference maintaining the accuracy of the external one without discontinuity. A software routine estimates the frequency and time drift allowing the RF muting when these drifts overcome a settable threshold. When the external reference returns, a software procedure assures a soft re-lock without discontinuity. An internal GPS receiver is available to provide a high accuracy frequency reference and to allow operation in a Single Frequency Network (SFN). EXCITER 10 MHz

3 A/D THE BROADCASTING & TELECOMMUNICATION PIONEER ITELCO Numbers INSTALLATIONS 700 DIFFERENT CONFIGURATION 200 DVB-T2 TX installed (July 2015) high and medium power TV transmitters still in service since Operating Countries Why ITELCO? INNOVATION Always Pioneers in the broadcasting industry STRENGHT high and medium power TV transmitters still on-air since 1985 EASY MAINTENANCE & POWER EFFICIENCY Save money and pay back your transmitter RESEARCH & DEVELOPMENT 10% of our revenue reinvested into R&D Frequency Reference Characteristics RF frequency offset ±10 KHz DTV, ± 50 KHz Analog, 1 Hz step Frequency reference input 1 BNC, 50 Ω, 10 MHz, 7 dbm± 6 db Frequency reference output 1 BNC, 50 Ω, 10 MHz, 7 dbm 1 PPS input 1 BNC, 50 Ω, TTL 1 PPS output 1 BNC, 50 Ω, TTL GPS input 1 N, 50 Ω, up to 250 m RG58 cable OCXO frequency aging ±1x10-7/year, ± 3x10-7/10 years GPS frequency accuracy ±1x10-12 average 24h of sync GPS frequency aging ± 5x10-10/24h free running GPS frequency short term stability <3x10-11, 10 s Allen variance The RF output signal, generated by the digital modulator, is sent to the RF amplifier section. The amplifier employs only latest generation transistors and provides an output signal with power up to 5 Wrms DTV or 20 Wps ATV, adequate for subsequent high power amplification. RF Characteristics RF output (exciter) 1 N, 50 Ω, 5 Wrms DTV, 10 W ps Analog Forward RF input (power meter) 1 N, 50 Ω, 0 dbm +3, -7 db Reflected RF input (power meter) 1 BNC, 50 Ω, 0 dbm +3, -7 db RF monitor 1 BNC, 50 Ω, 0 dbm

4 A / D THE NEW MULTIMODE EXCITER, COLLECTS ALL ITELCO-ELECTROSYS EXPERIENCE IN DIGITAL SIGNAL PROCESSING. IS AN INNOVATIVE AND COMPACT EXCITER OBTAINED BY OPTIMIZATION AND SIMPLIFICATION OF THE RELIABLE MEX EXCITER INTO A NEW GENERATION PLATFORM. The control and supervision of the exciter are guaranteed locally with graphical display and keyboard, remotely through Simple Network Management Protocol (SNMP v1/ v2c/v3) and Web Server on Ethernet interface. All parameters available on the display can be accessed remotely. On the exciter front panel, a USB connection is also available. It can accommodate a pen-drive to save the history log or load/save settings (HOST), or can be used for a connection to a PC to carry out monitoring, supervision or maintenance (DEVICE). The remote control and supervision are possible by using two methods: by means of Web browser displaying HTML pages (independent from platform), or by downloading and installing on PC (MS Windows OS) Electrosys proprietary software. A control through the USB port is possible with proprietary software. HTML pages can use SSL encryption techniques on HTTPS connections. SMTP (Simple Mail Transfer Protocol) is used for events notification (such as SNMP TRAP) to five different destination addresses. The NTP protocol provides synchronization of the internal RTC (Real Time Clock) with one or more NTP servers. The administration operations and the management of the relevant parameters are performed using Telnet and FTP (File Transfer Protocol) protocols. The MEXII remote management is regulated by three privileges of access that determine the action possibilities based on the user level: Administrator: full control; Configurator: operative settings; End User: check of the exciter and some simple settings. REMOTE CONTROL MANAGEMENT MEXII firmware is upgradable via USB or via Ethernet (also remotely via FTP). MEXII is capable of interfacing with new generation ITELCO-Electrosys equipment (Central Control Unit, HPAs, etc.) via 2 CAN Bus that ensure high reliable and strong data exchange. In order to maintain compatibility with previous generation equipment, the Exciter is also provided with RS-232 and RS-485 connections. Optionally, it can be equipped with dry contact parallel interface.

5 A / D Remote Interfaces RS-232 ITELCO proprietary control protocol RS-485 ITELCO transmitter control system Ethernet SNMP, HTTP, HTTPS, SSL, SNMP, SMTP for supervision and control FTP / Telnet for administration NTP CAN Bus for transmitter control system Parallel for simple control and commands General Characteristics Power supply V, Hz Temperature 0 45 C Relative Humidity 0 90 % (non condensing) Storage temperature C Mechanical Specifications Transmitter Dimensions (wxdxh) Transmitter Weight 485x520x45 5 kg DVB-T/H The modulator is fully compliant with EN , TS and EN standards including hierarchical modulation and DVB-H. In case of SFN operations, the card provides the extraction of the MIP (Megaframe Initialization Packet) information, to carry out the automatic delay compensation and optional function elaboration (time offset, frequency offset and power control functions). In case of MFN operation, bit rate adaptation by inserting or discarding null packets is performed and, in order to avoid PCR jitter, PCR restamping is done. The modulator continuously checks the input transport stream to find any first priority error (according to TR ); in case of error, it can switch to the other input. If the two input transport streams are identical, the switching is seamless. For test purposes, a contiguous block of carriers can be switched off or, on the contrary, can be switched on. Simplified Box Diagram ASI 1/SMPTE 310M 1 ASI 2/SMPTE 310M 2/NICAM AD DATA ASI 3/NICAM AD DATA 728 Kb/s ASI 4/NICAM CLOCK 728 Kb/s GIGA BIT ETHERNET RF AMPLIFIER 10 MHz In RF REFLECTED In 1 PPS In DIGITAL 10 MHz Out 1 PPS Out MODULATOR GPS RF In CAN CAN 2 ETHERNET USB RS-232/RS-485 VIDEO 1 RF In 1 RF Out RF In 2 RF REFLECTED In ATV + NICAM RF In 1 RF RECEIVER VIDEO 2 INTERFACE RF In 1 LEFT/LEFT NICAM RIGHT/MPX RIGHT NICAM SUB CARRIER DISPLAY and KEYBOARD RF Out AC/DC DVB T/H Characteristics Inputs Input Data format 4 BNC 75Ω, DVB-ASI, 1 RJ-45 GbE 188/204 bytes packets, continuous and burst mode Input Bit Rate According to ETS in SFN Bit rate adaptation and PCR restamping in MFN IFFT 2K, 4K, 8K Code rate 1/2, 2/3, 3/4, 5/6, 7/8 Guard interval 1/4, 1/8, 1/16, 1/32 Interleaver Native, in-depth Constellation QPSK, 16QAM, 64QAM Hierarchical (alpha) 1, 2, 4 Network operation MFN, SFN Bandwidth 5, 6, 7, 8 MHz MER > 40 db Shoulders > 50 db Carrier suppression (center frequency) > 60 dbc Average amplitude imbalance <1 % Average quadrature error <1 Spurious level in band <- 70 dbc

6 A / D ATSC (8VSB DTV) The modulator is fully compliant with ATSC specifications. The system clock can be locked to the input data (the input bit rate must be Mbit/s) or to the 10 MHz reference (internal, external or from the integrated GPS receiver); in this case the bit rate adapter (described in the DVB-T/H section) allows the exciter to accept any input bit rate. The modulator continuously checks the input transport stream to find any first priority error (according to TR ); in case of error, it can switch to the other input. DVB-T2 The modulator is compliant with EN , ETSI TS DVB-T2 specifications, and is able to manage multiple PLP (up to 8) and MISO transmission for SFN. Moreover it supports T2-MI protocol to extract synchronization and configuration from the DVB-T2 Gateway. A complete set of test modes are available to make the user able to perform tests without inputs. Optionally, if the two input transport streams are identical, the switching is seamless. ATSC Characteristics Inputs System clock Input Bit Rate Modulation Bandwidth EVM Shoulders Spurious level in band Spurious level out band Both pre-distorter and pre-equalizer can be adaptive. 2 BNC 75 Ω, SMPTE 310M, 1 RJ-45 GbE locked to the input data or 10 MHz reference Mbit/s (lock to the input data) Bit rate adaptation and PCR restamping (lock to the 10 Mhz) 8-VSB 6 MHz < 1.5 % rms > 50 db <- 70 dbc <- 60 dbc DVB-T2 Characteristics Inputs Input data format 2 BNC 75Ω, DVB-ASI, 188/204 packets, continuous and burst mode, 1 RJ-45 GbE MPEG-2 TS over ASI, T2-MI over ASI or IP PLP Management 1 8 PLP Constellation QPSK, 16QAM, 64QAM, 256QAM L1 post constellation BPSK, QPSK, 16QAM, 64QAM Constellation Rotation Normal, Rotate Channel Bandwidth 5 / 6 / 7 / 8 MHz Guard Interval 1/128, 1/32, 1/16, 19/256, 1/8, 19/128, 1/4 FFT mode 1k, 2k, 4k, 8k, 16k, 32k (normal or extended) Code rate 1/2, 3/5, 2/3, 3/4, 4/5, 5/6 FEC Short (16k), Normal (64k) Pilot pattern From PP1 to PP8 Network type MFN, SFN MER > 40 db Shoulders > 50 db Carrier suppression (center freq) > 60 dbc Average amplitude imbalance < 1% Average quadrature error < 1 Spurious level in band < -70 dbc

7 A / D ISDB-TB The modulator is fully compliant with ARIB STB-B31 and TR-B14 specifications and manages normal MPEG-2 TS (MFN) and BTS (Broadcast Transport Stream) input data formats. TMCC (Transmission and Multiplex Configuration Control) are extracted for modulator configuration. In MFN mode, Single Layer A is used and Bit Rate Adaptation and PCR re-stamping are performed. ANALOG TV No trimming operations are needed due to fully digital video and audio modulation, obtaining an exceptionally performance stability over environmental conditions changes. The exciter has a stereo/dual sound encoder with automatic mode selection using teletext line, and one wide band (up to 120kHz) input for an external audio encoder. Optionally, an integrated NICAM modulator, which can also accept an external pre-codified NICAM 728 Kbit/s stream and additional data, is available. Additional RF sound output, for sound separated amplification transmitters, is available. ISDB-Tb Characteristics Inputs Input data format 2 BNC 75Ω, DVB-ASI, 188/204 packets, continuous and burstmode, 1 RJ-45 GbE TS, BTS Mapping DQPSK, QPSK, 16QAM, 64QAM Carrier spacing 1 KHz, 2 KHz, 4 KHz FEC 1/2, 2/3, 3/4, 5/6, 7/8 Guard Interval 1/4, 1/8, 1/16, 1/32 Time Interleaver 0 16 Hierarchical Up to 3 layers Network type MFN, SFN MER > 40 db Shoulders > 50 db Carrier suppression (center freq) > 60 dbc Average amplitude imbalance < 1% Average quadrature error < 1 Spurious level in band < -70 dbc VIDEO Characteristics TV standard B, G, D, H, I, K, K1, M, N Colour standard PAL, NTSC, SECAM Number of video input 2 (not simultaneously working), BNC Input impedance 75 Ω Return loss > 36 db (0 6 MHz) Input voltage level 1 Vpp ± 6 db Input AGC Manual or on ITS line Manual gain adjustment step 0.1 db Clamping Back porch level Modulation depth 5 15 % White limiter % modulation Sync pulse regeneration % Video filtering According to the standard or by-passed Differential gain variation <0.5 % Differential phase variation <0.5 Static linearity ± 0.1 db (25 Hz fmax, depending on the st.)

8 ANALOG TV AUDIO Characteristics Number of audio input Input impedance Nominal input level Gain adjustment step Hard limiter Channel cross-talk Stereo cross-talk Harmonic distortion (with preemphasis) FM SNR (unweighted) FM SNR (weighted) AM Noise Preemphasis 2, XLR 600 Ω />5 KΩ (balanced and unbalananced) 0 dbm, 6, + 21 db 0.1dB adjustable 1KHz step, KHz deviation >70 db (40 Hz 15 KHz) >40 db (40 Hz 15 KHz) < 0.1% (40 Hz 15 KHz, ± 50 KHz deviation) < - 70 db (± 50 KHz deviation at 500 Hz) < - 65 db (± 50 KHz deviation at 500 Hz) < - 60 db 50/75 μs (± 0.1 db; can be switched off) Input frequency response ± 0.1 db, 40 Hz 15 KHz ± 0.1 db, 40 Hz 120 KHz in wide band mode Pilot signal generation KHz (Locked to the line frequency) Pilot carrier modulation AM Pilot modulation depth 50 % Pilot modulation tone frequency 0 0 (mono), f line/133 (stereo), f line/57 (dual) Audio encoder mode Mono, stereo, dual sound, wide band, auto NICAM Characteristics Number of audio inputs 2, XLR Input impedance 600 Ω />5 KΩ (balanced and unbalanced) Nominal input level 0 dbm ± 10 db Pre-codified NICAM data input 728 Kbit/s, BNC, high impedance TTL Additional data input 728 Kbit/s, BNC, high impedance TTL Clock for external coder or additional data 728 KHz, select. in/out, BNC, high imp. TTL Frequency reference output 38.9 MHz, BNC, TTL Carrier Frequency MHz (I), 5.85 MHz (B/G) Harmonics and spurious > 50 db below NICAM carrier level Spectrum Shaping ± 0.5 db from nominal Amplitude Imbalance < 0.1 db Quadrature error < 1 THD+N at 2 KHz tone input < 0.1 % at nominal input level Itelco Electrosys Certifications: Quality System UNI EN ISO 9001 ITQS - To provide our customer with very reliable equipment and premium solutions, we follow a total quality management philosophy ISO 9001:2000 n 9110.ITE1

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