Initialization Phase 3 - Dvb-C; Configuration Of The Modulator - axing SKM 40-00M Betriebsanleitung

Operation instructions | SKM 40-00M | SKM 40-04M | SKM 80-00M
3.5. Initialization phase 3 – DVB-C
Note: Depending on the installed firmware the signals are modulated into DVB-C or DVB-T (see 3.6 on page
28 and 3.7.1 on page 31).
In phase 3, the modulators are configured.
 Click on PHASE 3, to modify the setting of the modulator.
3.5.1.

Configuration of the modulator

Output channels and The first modulator can be set to any output channel between S2 and CH 87. The
channel spacing other three modulators are automatically set by incrementing the output.
For example:
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.
Output level / Level The Output Level options include attenuation and deactivation of the modulator.
setting Each of the four modulators is set separately. The max. output level of approx. 100
dBµV is reached with an Output Level setting of 20 dB.
Vernier adjustment: The vernier adjustment of the output channel is performed in 0.5 MHz steps.
26
modulator 1
modulators 2, 3 and 4
2020-02-23 | Technical improvements, changes in design, printing- and other errors expected.
= Channel 21
= Channels 22, 23 and 24