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Technical Specification
Reference Guide: TT128x High Definition Professional Receiver/Decoder Page B-11
ST.RE.E10141.5
Table B.11: L-band Satellite Input — Eb/No Ratio
Convolutional FEC Rate Eb/No Ratio (dB) in IF Loop for correct MPEG-2 system
operation
1/2 QPSK 4.5
2/3 QPSK 5.0
3/4 QPSK 5.5
5/6 QPSK 6.0
7/8 QPSK 6.4
2/3 8PSK 6.9
5/6 8PSK 8.9
8/9 8PSK 9.4
3/4 16QAM 9.0
7/8 16QAM 10.7
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.
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 are as per Table B.12.
Table B.12: LNB Power and Control
Parameter Specification
Voltage V (nominal) Receiver Polarisation
8
Voltage 13
18
Vertical/circular right
Horizontal/circular left
Current 350 mA maximum
LNB control 22 ± 2 kHz tone
Tone amplitude 0.6 ±0.2 Vp-p
Boost voltage 1 V typical
8
Receive Polarisation: As specified in ETS 300 784: Satellite Earth Station and Systems (SES); Television Receive-only
(TVRO) earth stations operating in the 11/12 GHz frequency bands.