Promax MO-180 Manual De Usuario página 91

USER'S MANUAL MO-180
Hierarchy
Using this function the COFDM modulator is switched between hierarchical
mode, with different alpha constellation ratios, and non-hierarchical mode operation.
The options available are:
OFF Non-hierarchical operation
α=1 Hierarchical constellation with α = 1
α=2 Hierarchical constellation with α = 2
α=4 hierarchical constellation with α= 4
HP Code Rate
Using this function, the user can modify the convolutional code rate for the High
Priority (HP) Transport Stream (TS). The available options are 1/2, 2/3, 3/4, 5/6 and
7/8.
LP Code Rate
Using this function, the user can modify the convolutional code rate for the Low
Priority (LP) Transport Stream (TS). The available options are 1/2, 2/3, 3/4, 5/6 and
7/8.
Constellation
Here the menu allows the selection of one of the available constellations. Note
than in hierarchical modes QPSK is not a valid choice. The options are QPSK, 16QAM
and 64QAM.
Guard Interval
This function selects the required guard interval for the COFDM signal. The
available values are 1/4, 1/8, 1/16 and 1/32.
FFT Mode
Selection of the required FFT value (number of carriers in the COFDM
ensemble). The modulator has these options:
2K 2048 carriers, 1705 active
8K 8192 carriers, 6817 active
4K 4096 carriers, 3409 active. DVB-H operation only (menu entry
"MODULATOR:Mode" must be set to DVB-H).
04/2008 Page 21