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Initialization - phase 3 (DVB-C)
In phase 3, the modulators are configured.
Note:
Depending on the modulation standard the signals are modulated into DVB-C or DVB-T (see 3.7.2 on page 26).
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Click on PHASE 3, to modify the setting of the modulator.
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Configuration of the modulator
Common level
The
Common Output Level
option include a general attenuation of all
modulator outputs. The highest output level is reached with a setting of 20 dB,
the lowest level with a setting of 0 dB.
Output channel
The modulators can be set to any output channel between S2 and CH 87. No
output channel can be assigned several times!
DVB-C constellation: With DVB-C modulation, you can choose between 32QAM, 64QAM, 128QAM
and 256QAM. 256QAM enables the highest data transmission rate, but it also
requires the best network quality.
DVB-C symbol rate:
The DVB-C symbol rate can be freely set between 1000 and 7500. The
standard value is 6900. Some networks also work with 6875. When working
with a bandwidth of 7 MHz, 6111 is customary.
Fine Level
The
Fine Level
option include fine attenuation from 0 to -3dB of each
modulator output and the deactivation of the modulator (off).
Fine Tune:
The
Fine Tune
adjustment of the output channel is performed in 0.5 MHz
steps.
