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USER'S MANUAL. TV EXPLORER HD
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
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).
Modulations
Carriers modulation. It also defines the system noise immunity.
(QPSK, 16-QAM and 64-QAM).
Hierarchy
The DVB-T/H 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.
Cell ID
Cell identifier. Shows the transmissor identification code.
Figure 20.- Screen of mesurement configuration (COFDM signals).
5.13.3 DVB-S/S2 (QPSK/8PSK) Digital Channel Configuration
Press the Measurements Configuration
CONFIGURATION menu and turn the rotary selector
signals parameters which can be defined by user and are described below:
02/2010
[17] key to access to the
[1] to access the QPSK/8PSK
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