2022-07-27 | Technical improvements, changes in design, printing- and other errors reserved.
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4.3.
Initialization - phase 3
Note:
Depending on the configured modulation standard or depending on the device type, the signals are
modulated DVB-C, DVB-T or DVB-T2. (see 5.2 on page 47).
In phase 3, the modulators are configured.
Click on PHASE 3, to modify the setting of the modulator.
4.3.1.
MK 8-0x, MK 16-0x, MK 8-0xN and MK 12-0xN (DVB-C)
Configuration of the modulator
Parameters
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 16QAM, 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.
