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Technical Specification
Page B-14 Reference Guide: TT128x High Definition Professional Receiver/Decoder
ST.RE.E10141.5
Eb/No ratio is referred to user bit-rate Ru188. See EN 300 421
specification. For more detailed specification information and advice on
performance in specific applications, please contact TANDBERG Television
Customer Services.
Table B.15: DVB-S2 Satellite Receiver Input – DVB-S2 Es/No Ratio
LDPC FEC Rate DVB-S2 Theoretical
13
Es/No Ratio (dB) in perfect linear
channel for correct MPEG-2 system operation
1/2 QPSK 1.00
3/5 QPSK 2.23
2/3 QPSK 3.10
3/4 QPSK 4.03
4/5 QPSK 4.68
5/6 QPSK 5.18
8/9 QPSK 6.20
9/10 QPSK 6.42
3/5 8PSK 5.50
2/3 8PSK 6.62
3/4 8PSK 7.91
5/6 8PSK 9.35
8/9 8PSK 10.69
9/10 8PSK 10.98
For more detailed specification information and advice on performance in
specific applications, please contact TANDBERG Television Customer
Services.
LNB Power and Control
The IRD provides LNB power and control signals through the active RF
input connector. LNB power and controls are enabled through the Satellite
Input Menu, see Annex C, Menus.
The IRD supports voltage controlled LNBs only. The LNB power circuit
provides automatic protection against short circuits in the LNB or its cable.
When the short circuit has been removed recovery is automatic.
Switchable boost of the LNB voltage to allow for losses in long cables and
control of 22 kHz tone insertion are provided. The LNB power
characteristics comply with IEC 1319-1 and are as per Table B.16.
13
Add 0.2 dB (0.4 dB for FEC 3/5) to any system calculation for modulator – demodulator implementation margin