12
5.7.
RF outputs
Headend has 16/32 independent and agile channels.
"Output frequency“ parameter can be entered manually or selected as a channel from combobox. Channels that can be
selected from the list depend on which region is selected. If you need any other frequency – select “Manual” and type the
needed frequency. Frequency step is 0.1 MHz. „Enable“ checkbox will enable channel to the output. Global attenuator can
be entered up to 15 dB. Also there is individual precise attenuator up to 2.5 dB in step of 0.5 dB.
Press „Update“ to change settings. In case, if any modulation parameter was changed, all channels will be restarted with
new settings. Exception is „Attenuator“, changes in this parameter will not restart the modulator.
Figure 18. DVB-C output parameters
16/32 independent QAM modulators can be setup in this section. There is no requirement for channels to be adjacent
or sorted by frequency, see picture 18. Each channel can have own constallation QAM-16/32/64/128/256, symbol rate
3500...7200 Mbps. Note, that symbol rates higher than 6956 kSym/s will exceed 8 MHz bandwidth, so these symbol rates
should be used carefully.
