Outline
DTMB-T is a high performance modulator in accordance with our country terrestrial wireless transmission TV signal.This modulator completely complies all the 330 kinds modes of EN50083 standards,which supply 1pps and 10MHz input, Built-in time synchronization module, as well as the SIP packet remote configuration modulation parameter.
Features
Support all the 330 modules of the 20600-2006 standard
With two ASI input,support hot reserve input mode
Support SFNand MFN mode
High reliability of amplitude output
Applications
Program collection and distribution
The terrestrial digital signal transmission system with the television transmitter
SIP packet remote configuration modulation parameter
Transport stream processing
Technical index
support all the 330 modes of GB20600-2006
with 2 ASI inputs,supporting hot backup
support SFN and MFN
output level: 0dBm
MPEG-TS Input
Complying EN 50083 ASI standard
support 188/204 Bytes packet mode
support packet and burst mode of transport stream
bit rate: 4.813Mbps ~ 32.486Mbps
interface: BNC with resistance 75Ω
RF output
with adjustable center frequncy 470MHz-862MHz, Stepping : 1KHz
major level: 0dBm
attenuation: 10dB–0dB, Stepping: 0.5dB
test output: -30 dB
return loss : >15dB
stability: ±0.1dB/10℃
I/Q phase balance error：< 0.05%
I/Q phase error：< 0.05°
MER: >38dB
shoulder frequency: >50dB @ ± 4.2MHz;noise: >50dB
connector: N-type,resistance as 75Ω
MIP process
synchronization information,remote setting for modulation parameters
TPS option
support all the modes of GB20600-2006
network mode
SFN mode:time offset setting,time synchronization,bit rate synchronization,frequency synchronization
MFN mode: bitrate adaption, NIT update,PCR adjustment
modulation and channel encoding
modulation: TDS-OFDM
number of modulation carrier(FFT): 3780
guard interval: 1/4 (945),1/7(595),1/9(420)
FEC outer: BCH
FEC inner: LDPC
encode mode: 0.4，0.6，0.8
modulation mode: 4QAM-NR ,4QAM,16QAM,32QAM,64QAM
bandwidht: 8MHz
clock synchronization
outer clock with 10MHz (GPS)
Input level: -15dBm~ +15dBm
Input connector: BNC socket,resistance as 75Ω
inner clock with 10MHz
stability: 0.5ppm(classic); 3.0 ppm(maximum)
level: 0dBm ± 3dBm
outer 1pps clock(GPS)
Input reference level: TTL level –5 KΩ
Input reference minimum pulse width: 1μs
Input connector: BNC socket, resistance as 75Ω
Warm tips:
Specification and picture are for reference only, the actual item is the standard,welcome to consult.
Digital Headend System
