2018-10-05 | Technical improvements, changes in design, printing- and other errors expected. 25
3.5. Initialization phase 3 – DVB-C
Note: Depending on the modulation standard the signals are modulated into DVB-C or DVB-T (see 3.7.2 on
page 31).
In phase 3, the modulators are configured.
Click on PHASE 3, to modify the setting of the modulator.
The output channels are compulsory assigned to adjacent channels.
3.5.1. Configuration of the modulator
Output channels and
channel spacing
The modulators can be set to any output channel between S2 and CH 87. No
output channel can be assigned several times!
DVB-C modulation: 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.
Common Output 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.
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.
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