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Technical Specification
Instruction Manual: TT1260 Standard Definition Professional Receiver/Decoder Page B-11
ST.TM.E10100.1
Table B.11: QPSK L-band Satellite Input — Eb/N
0
Ratio
Convolutional FEC Rate Receive Eb/N
0
Ratio (dB min) in IF Loop for Correct MPEG-2
System
½4.5
2
/
3
5.0
¾5.5
5
/
6
6.0
7
/
8
6.4
Eb/N
0
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 TT1260 range of QPSK Satellite Receivers provide LNB power and
control signals through the active RF input connector. The 22 kHz tone is
manually turned on and off. LNB power and controls are enabled through
the Satellite Input Menu, see Annex C, Menus.
The TT1260 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
manual control of 22 kHz tone insertion are provided. The LNB power
characteristics is as follows:
Table B.12: LNB Power and Control
Parameter Specification
Voltage (V min) Voltage (V typ) Voltage (V max) Receiver Polarisation
7
Voltage (V
nominal
) 12.3
17.3
13
18
13.65
18.9
linear vertical/circular right
linear horizontal/circular left
Current £ 350 mA
Tone frequency 22 ± 2 kHz
Tone amplitude ON: 0.6 ±0.2 Vp-p
OFF: £0.05 Vp-p
Boost voltage Supported
7
Receive Polarisation: As specified in EN 300 784: Satellite Earth Station and Systems (SES); Television Receive-only
(TVRO) earth stations operating in the 11/12 GHz frequency bands.