SD-3710 QPSK modulator consists the following moulds
● Date processing unit transfers the signals from interfaces to standard signal ,which realizes the QPSK preprocessing.
● QPSK modulating unit modulates the data stream to spectrum signal .RF signal:250MHz～2150MHz
● CPU/LCD/LED/keyboard finishes the keyboard input, LED display and intelligent control
Mainly features:
● Error correcting codes is fully in the line with DVB-S standard
● Realize low frequency over 250MHz QPSK signal output
● TS bit rate: 1～72Mbps
● Symbol rate range of output signal: 1～45Mbaud(adjustable) ,1Kbaud(Stepping)
● Bandwidth range of output signal: 1.25～56.25MH(Roll-off factor 0.25)
● Output electric level: 95dBuV～110dBuV(Stepping)
● Input 188/204 packet Adaptive, display input data format real-timely
● Use Large cache design ,ASI interface supports burst and uniform input stream
● Agility center frequency :250MHz～2150MHz(adjustable),Min stepping:50KHz
● Have functions of NIT mapping and transmission,Support over 44 NIT mapping of frequency points
● PID filtering and re-mapping function
● Support extraction, analysis and modification of PSI/SI
● Filter the empty input data packet and fill the output data
● PCR correction function , accurately correct the PCR in the input data separately
● Test and display the input system bit rate and effective rate real-timely
● Provide -20dB RF test interface
● Network controlling interface , realizing Centralized network management, remote upgrade and maintenance
● Power-down memory function.
Performance and Parameter
1. Data interface.
1.1 ASI interface (Asynchronous serial interface)
A Input:
● Socket: BNC
● Impedance: 75Ω
● Packet format: 188 or 204 bytes (No channel coding)
● Channel data rate: 270Mbps
● Max. Effective data: 72Mbps
● Standard: DVB standard
N Loop output
● BNC Socket: BNC
● Impedance: 75Ω
1.2 SPI input interface (Synchronous Parallel Interface)
● Socket：DB-25 female
● Packet format: 188 or 204 bytes
● Standard: DVB Compatible, LVDS working method
22. IF interface
A. RF output:
● BNC Connector: BNC
● Impedance: 75Ω
● Output frequency: 250MHz～470MHz, 470MHz～800MHz，950MHz～1800MHz
● Return loss: ≥15dB
● Output electric level:95dBuV～110dBuV(adjustable)
● SNR：≥45dB
B. RF test output:
● Connector: BNC
● Impedance : 75Ω
● Output electric level：75dBuV～90dBuV(adjustable)
3 Signal channel coding
● Modulation：QPSK
● Channel coding：FEC and RS coding of DVB-S standard
● MER：≥40dB
● SNR：≥45dB
4 Network management interface:
● Ethernet interface: IEEE802.3 Ethernate .RJ45 interface
● Software agreement: SNMP
5.Power supply
● Voltage: 165V～265VA or 85V～265VAC
● Frequency: 50Hz±2%
● Power consumption: 50W
6 Working environment:
● Environment temperature: ＋5°C～45°C
● Storage temperature: －25°C～+55°C
● Relative Humidity: 10～75%