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Lnb power and control, Table b.8 for qpsk bit-rate r188 limits, Table b.9 – TANDBERG High Definition Professional Recevier/Decoder TT1280 User Manual

Page 101

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Technical Specification

Reference Guide: TT128x High Definition Professional Receiver/Decoder

Page B-9

ST.RE.E10141.5

Table B.8: QPSK Bit-rate R188 Limits (Mbit/s)

FEC R188min

R188max

1/2 1.000000 41.470588

2/3 1.228758 55.294118

3/4 1.382353 62.205882

5/6 1.535948 69.117647

7/8 1.612745 72.573529

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.9.

Table B.9: LNB Power and Control

Parameter Specification

Voltage V (nominal)

Receiver Polarisation

5

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

5

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.

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