Short Technical Guide - Kathrein UFS 702si Operator's Manual

Short technical guide

Channel package
DiSEqC™
DiSEqC™ components
DVB MPEG-2
EB/NO ratio
FEC
OTR
The channel package for a digital transponder normally
includes several TV and radio channels. Each channel
package has a fi xed assignment for the transponder
transmission frequency, for polarisation (horizontal or
vertical), for the symbol rate and for the Viterbi rate or error
rate.
DiSEqC™ (Digital Satellite Equipment Control) is a
communication system between a satellite receiver (master)
and the peripheral satellite components (slaves), such as
LNBs, multi-switches, rotating antenna systems.
It is a single master/multi-slave system, i.e. there is only
ever one master in the satellite system. All activities start
from the master.
If DiSEqC™ switching matrices are cascaded, the master
receiver must transmit the DiSEqC™ signal several times,
so that all DiSEqC™ multi-switches in the cascade receive
their commands.
These days, DiSEqC™ components (slaves) must be
reverse compatible, i.e. respond to the analogue switching
criteria from receivers that are only equipped with H/V and
22 kHz control signals.
A DiSEqC™ switching matrix will work with analogue
switching criteria until the DiSEqC™ command from the
master is received. All analogue switching criteria are then
ignored.
DVB is the abbreviation for Digital Video Broadcasting.
DVB-S refers to the transmission method (S = satellite).
MPEG is the abbreviation for Moving Picture Experts
Group, a working group that formulates internationally
applicable standards for the digital compression of video
and audio. MPEG-2 has established itself as the standard
for compression of digital TV signals. MPEG-2 works up to
a data rate of 100 MB/s.
The EB/NO ratio is a measure of the signal to noise ratio of
a digital signal. The value is not identical to the C/N value
familiar from analogue reception technology. At EB/NO
values below 5 dB no reception is normally possible.
FEC is the abbreviation for Forward Error Correction. The
FEC error rate corresponds to the Viterbi rate.
One Touch Recording
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