Ericsson RX1290, Reference Manual

Page: 17 / 176

Introduction
1.3.2 Input Connections
The Satellite Receiver interfaces directly to Low-Noise Block (LNB) and accepts an
intermediate frequency (IF) input in the band 950 - 2150 MHz (L-band) for operation
in the specified symbol-rate range (see
Annex B, Technical Specification ). The unit
can provide dc power and polarization switching to the LNB.
1.3.3 What the Satellite Receiver Does
The Receiver can be tuned to a specified satellite channel frequency and
polarization. The input is down-converted via a Low-Noise Block (LNB) to provide an
L-band input to the Receiver. The front-end tuning is microprocessor controlled with
a frequency synthesized local oscillator. A software tuning and acquisition algorithm
resolves translation errors (mainly due to the LNB).
The signal is then passed to a demodulator that recovers the signal using soft-
decision decoding. The resulting stream is Reed-Solomon decoded and
descrambled to provide inputs to the Decoder circuit. The received channel may
contain multiple Services, therefore the Receiver’s demultiplexer is configured to
select a single video Service and other audio/data components and present them at
the output.
Figure 1.3 What the Satellite Receiver Does
EN/LZT 790 0003/2 R1A 1-9