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The TWIN DVBS2 to QAM unit consists of two transmodulator referred to as modules A and B. Each module receives a satellite transponder signal (DVB-S2 standard: QPSK or 8PSK) and demodulates it to obtain a MPEG2 transport packet. The TS is then modulated in QAM format and sent to the output channel (UHF or VHF).
TS settings in order to comply with DVB-T requirements:
Stuffing, to perform faster scanning in the STB or when using STB with a fixed symbol rate.
MUX services removing to avoid STB detection/loading
Configurable TS identifier in the NIT. It is possible to substitute the satellite descriptor for the DTT descriptor allowing a better STB service detection.
It is possible to replace the operator_id field received in the input transport stream with a value corresponding to the cable network operator.
Occupation per service and of the complete MUX QAM, allowing output space optimization.
References
5630
Satellite
Demodulator
Input frequency
950-2150 MHz
Modulation
DVB-S2 (QPSK, 8PSK) / DVB-S (QPSK)
Input level
49 to 84 dBμV (-60 to -25 dBm)
Symbol Rate
2 to 42.5 Mbaud (DVB-S)
10-30 Mbaud (DVB-S2)
Frequency steps
1 MHz
FEC Input
LDPC (9/10, 8/9, 5/6, 4/5, 3/4, 2/3, 3/5, 1/2)
Input connectors and output
“F” female
FEC Output
BCH (Bose-chaudhuri-hocquenghem)
Input impendance
75 ohm
Roll-off factor
20%, 25%, 35%
LNB power supply
13/17V/OFF 22 Khz (ON/OFF)
Return Losses
10 dB min.
Throughput Losses:
< 1,5 dB typ.
QAM
Modulator
Modulation format
16, 32, 64, 128, 256 QAM
Scrambling
DVB ET300429
Symbol Rate
6,9 Mbaud max
Interleaving
DVB ET300429
Roll-Off Factor
15%
Bandwidth
8 MHz max.
Block Code
Reed Solomon (188, 204)
Spectral inversion:
Normal /Inverted (Select)
UP Converter
Output frequency
45-862 MHz (Select.)
Through loss
<1,5 dB typ.
Frequency steps
250 KHz
Return loss
>12 dB typ.
Phase Noise
90 dBc/Hz @10KHz typ
Input and output connectors
“F” female
Output level
80 ±5 dBμV
Output impedance
75 ohm
Adjustable Output level
>15 dB (prog.)
Spurious level:
General
Power supply
24 V
Comsuption 24 V
550 mA typ. (without powering LNB)
Protection index IP20 800 mA typ. (powering LNB)
