Detailed Product Description

DMB-2200 Digital TV Modulator for DMB-T/H is the special modulator for China small and middle-size terrestrial DTV network and enterprise application markets. The modulator supports all the GB20600-2006 channel encoding and modulation modes, the RF output is from 470 to 862MHz, 0dBm level, which can excite small transmitter directly. The modulator has 1PPS and 10MHz input and contains clock synchronization module so that it can be used in SFN. DMB-2200 is the most cost effective Modulator in the market.

Main features:

• GB-20600 Standard supported
• 2 ASI Input, redundancy mode supported
• SFN & MFN Supported
• 0dBm Output level
• High performance modulation
• Web browser remote control, SNMP is optional

SPECIFICATION

MPEG-TS Inputs

Comply to EN50083-9 ASI standard

188/204 bytes packet supported

ASI packet modes: burst/byte

Bit rate: 4.813Mbps~32.486Mbps

2 ASI inputs, redundant input mode

Connector: 75 ohm BNC

RF Outputs

Center Frequency                      470MHz~862MHz

Main Output Level Signal           0dBm

Attenuation                              0 to 10dB                    

Adjustable step                        0.5dB

Monitoring Output Level Signal   -20dB

Return Loss                              >15dB

Signal Stability                          ±0.1dB/10

I/Q amplitude unbalanced           <0.05%

I/Q quadrature error                   <0.05°

MER                                        >38dB

Spurious                                  >50 dB

Shoulder                                  >50 dB@±4.2MHz

Connector                                 50 ohm , N type

MIP Management

Synchronous information, remote configure modulator parameter

TPS option

SFN: Time offset, time synchronization , frequency synchronization, bit synchronization 

MFN: Bit rate adapted, NIT renew, PCR correction

Modulate and Code

Modulate                               TDS-OFDM

Supported modes(FFT)           1, 4K

Outer correct code                  BCH

Inner correct code rate (FEC)   LDPC

Code rates                             0.4, 0.6, 0.8

Inner interleave                       supported sign interleave and frequency interleave.

Guard intervals                       1/9, 1/7, 1/4

Modulate manner                    4QAM, 4QAM-NR 16QAM, 32QAM, 64QAM.

Bandwidth                               6MHz, 7 MHz, 8 MHz

Test Mode

PRBS sequence mode and pilot mode

Synchrony 

External 10MHz Reference  Connector      75 ohm BNC

                                         Frequency     10MHz

                                         Level             -15 to +15dBm

Internal 10MHz clock          Stability        0.5ppm

                                        Max              3.0ppm

                                        Level             0dBm ±3dB   

External 1PPS Reference    Connector      75 ohm , BNC

                                         Level          TTL level -5Kohms

                                         Min Pulse width  1us

SFN synchronization accuracy ±200ns