Dvb-S (Qpsk) Digital Channel Configuration - Promax PRODIG-3 Manual Del Usaurio

4) Spectral Inv. (spectral inversion)
This option enables spectral inversion to be applied to the input signal, though in
the majority of cases it should be in the OFF position (not inversion).
This configuration menu shows, besides the user definable COFDM signal
parameters, the value of the rest of signal parameters detected automatically:
Code Rate
Modulations
Hierarchy
Figure 17.- Screen of mesurement configuration (COFDM signals).

5.13.2 DVB-S (QPSK) Digital Channel Configuration

Press the Measurements Configuration
CONFIGURATION menu and turn the rotary selector [1] to access the QPSK signals
parameters which can be defined by user and are described below:
1) Spectral Inv
If necessary, activate the Spectral inversion (On). Reception will be bad if
spectral inversion has been incorrectly selected.
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Also known as Viterbi ratio, defines the ratio between the data bits
number and the total number of bits transmitted (the difference
corresponds to the number of control bits for the error detection and
recovery).
Carriers modulation. It also defines the system noise immunity.
(QPSK, 16-QAM, 64-QAM).
The DVB-T norm contemplates the possibility to make a TDT
transmission with hierarchical levels, it is to say a simultaneous
transmission of the same program with different image qualities and
noise protection levels, in order the receiver can exchange to a
signal of smaller quality when the reception conditions are not
optimal.
CONFIGURATION
» CHANNEL SET:
» SIGNAL:
» SYSTEM:
0 20 » FRAME RATE: 40
» CHANNEL BW:
FREQ: 650.00 MHz
» GUARD:
-3 kHz
» CARRIERS:
CH:
» SPECTRAL INV:
CODE RATE:
MPEG-2
CCIR
DVB-T
60 80 100 50Hz
8MHz
C/N: 16.5 dB
POWER: 66.2 dBuV
43 MER: 24.7 dB
CBER:
VBER: <1.0E-7
[17] key to access to the
USER'S MANUAL. PRODIG-3
PAL
120
1/8
8K
OFF 3.4E-4
2/3
03/2008