Comtech EF Data Vipersat CDM-570L, User Manual

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Vipersat Configuration
3-40
Vipersat CDM-570/570L User Guide
Calibrated Data Rate
This menu item is for information only and displays the Calibrated Data Rate
in Kbps for the target CDM-570/570L.
There is a proportional relationship between data rate and power level; as the
data rate increases, there is a corresponding increase in transmit power level,
and vice versa.
Nominal Power Level
This menu item is for information only and displays the Nominal Power Level
in dB for the modulator. This power level will vary as the data rate varies.
Max Power
The commissioning of a satellite terminal must comply with the calculated link
budget that is conducted before terminal installation. Using these calculations,
the maximum transmit power level permitted for the modulator(s) based on
link/satellite parameters can be configured. This is the value set by the Max
Power command in the DPC Configuration menu. Enter A at the command
prompt to display the Max Power dialog shown in figure 3-53.
Figure 3-53 Maximum Power Level prompt (CDM-570L)
If more than one modulator is used at this location, that must also be taken into
consideration and applied to this value set point. The value entered sets the
maximum power level allowed by all SCPC modulators.
Min Power
The Minimum Power level setting corresponds to the lowest transmit power
level permitted based on link/satellite parameters. Min Power typically can be
set to the lowest default value (-25.0 dBm for the CDM-570, -40.0 dBm for the
CDM-570L). There is generally no problem in allowing the modulator(s) to
reduce power levels when link conditions improve. Enter I at the command
prompt to display the Min Power dialog shown in figure 3-54.