DTMB Modulator A Chinese Terrestrial TV Standard, Alto-GAF

DTMB Modulator A Chinese Terrestrial TV Standard, Model:Alto-GAF

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Main Feature　　　
　　

　Compliant with Terrestrial TV standard in China GB20600-2006
　

　2 TS ASI inputs for 188/204 byte, Packet Mode and Burst Mode
　　

　TDS-OFDM modulation
　

　Support 1 or 3780 sub carriers
　

　Guard Interval: 1/4, 1/7,1/9
　

　FEC BCH LDPC: 0.4, 0.6, 0.8
　　

　Time Inter-leaver Depth: 240,720
　　

　Constellation: QPSK, 16QAM, 64QAM,4QAM-NR,32QAM
　

　Support SFN and MFN with SIP Processing
　

　Channel Bandwidth: 6,7,8MHz
　　

　RF agile for VHF or UHF with step 1Hz
　

　RF Level from –10dBm to 0dBm
　

　MER>38dB, Shoulder>50dB
　

　External 1pps and 10MHz Clock inputs
　

　Linear and non linear pre correction
　

　RS232 Control and Supervision or IP Web browser in option

Technical Specification

TS Input:
　　Complaint with EN 50083 ASI interface standard
　　2 1ASI input 188/204 packet, Packet and Burst mode
　　Bit Rate adaptation, Null Packet Filtering, PID Processing
　　Connector type: BNC female, Impedance 75Ohm

Modulation and channel coding:
　　TDS-COFDM Modulation
　　Sub carriers: 1 or 3780
　　FEC BCH LDPC: 0.4, 0.6, 0.8
　　Guard Interval: 1/4,1/7, 1/9
　　Time Inter-leaver Depth: 240,720
　　Constellation: QPSK, 16QAM, 64QAM,4QAM-NR, 32QAM
　　Channel Bandwidth: 6MHz, 7MHz,8MHz

Test Signal Modes:
　　PRBS TS Sequence, PN 9,15,23
　　Signal Carrier Test Tone
　　SFN Fine Tune

Linear Pre-correction:
　　Spectrum tilt adjustment: +/-2dB, step=0.2dB
　　Useful Bandwidth: 7.61MHz
　　Number of Pre correction points: 32
　　Amplitude pre correction: +/-3dB
　　Group Delay pre correction: +/-500ns

RF Output:
　　Central frequency: VHF or UHF by 1Hz
　　Signal level(Main): 0dBm +/- 2dB with 0dB to 10dB attenuation adjustable by 1dB step
　　Signal stability: +/- 0.1dB
　　Modulation error ratio(MER): >38dB
　　Shoulder: >50dB @ +/-5MHz from central frequency
　　Spurious: 50dB relative to total power
　　Return loss: >15dB
　　Connector type: N female, Impedance 50 Ohm

DTMB Network:
　　SFN: Time offset setting
　　MFN: BR adaptation, Static delay
　　Loss of Reference Signal 1pps, 10MHz management
　　SIP option field processing: TX ID, Time offset, Frequency offset, Power, Cell ID, TX Mute

Clock Reference:
Internal 10MHz
　　Stability: 0.5ppm(typ); 3.0ppm(full temperature range)
　　Aging: 0.8ppm; Output level: 0dBm +/- 3dB
External 10MHz
　　Input level: -5dBm to +10dBm
　　Input connector type: N female, 50 Ohm
External 1pps reference
　　Input level: TTL level 5 KOhms; Pulse width: 1us
　　Input connector type: BNC female

Control Mode:
　　Local control: 6 buttons, LCD screen, LED
　　Remote control: RS232 or WEB browser through IP Ethernet RJ-45 in option

Control and Alarm:
　　Local control: 6 buttons, LCD screen, LED
　　Remote control: IP Ethernet RJ-45 or RS232
　　DB-9 with 2 Contact Relays for alarms: TS Loss, Bit rate Overflow, 1pps or 10MHz loss, SFN loss, etc

Physical conditions:
　　Power supply:AC 220V+/-10%, 80W
　　Operating temperature: 0-50℃
　　Storage conditions:-10-70℃, humidity 10%-80% at 50℃
　　Dimension: L=540mm, W=483mm, H=44mm (1RU)
　　Weight: Net 7 kg, Gross 10 kg

Non linear Pre-correction: Single shoulder and double

Correction	Nb point	Abscissa range	Ordinate range	Step
AM/AM	16	-12 dB to +12dB	-6dB to +6dB	0.05dB
AM/PM	16	-12 dB to +12dB	-25°to +25°	0.05dB/0.2°

Abscissa range