Adtec RD-71 User Manual page 50

L-Band​ - ​ A llows the operator to enter the L-Band frequency within the range from 950MHz
to 2.15GHz. The value entered in this field is used with the Local Oscillator frequency to
calculate the Downlink frequency using the following rules. If Downlink < Local Oscillator,
then Downlink - Local Oscillator = │L-Band│. If Downlink > Local Oscillator, then Downlink
- Local Oscillator = L-Band
Downlink​ - ​ A llows the operator to enter the satellite downlink frequency. The value for the
Downlink frequency is used with the Local Oscillator frequency to calculate the L-Band
frequency.
Acquisition Range​ - ​ A cquisition Range is defined as the range of frequencies that the
tuner will scan in order to achieve carrier synchronization. Allows the operator to select the
range of frequencies that the RF tuner will sweep through to acquire the carrier. e.g:
If the desired carrier is at 1.080GHz and the ​ A cquisition Rangeis set to 5MHz, the RF tuner
will sweep through 1.080GHz ± 2.5MHz to acquire the carrier.
The formula for ​ A cquisition Range depends on the Symbol Rate. Carrier ​ A cquisition Range
(peak-to-peak) is 50kHz to 7.5 MHz. If a carrier has a Symbol Rate < 5 Mbaud,
then​ A cquisition Range = 1.5 x Baudrate Max. If the Symbol Rate is > 5 Mbaud the
Acquisition Range = 7.5 MHz max.
Type​ - ​ A llows the selection of DVB-S, DVB-S2 and DVB-S2X. It is recommended to use the
'DVB-S2 / DVB-S2X' mode for all S2/S2X carriers when the unit is keyed for S2X capability.
Symbol Rate​ - ​ S ymbol Rate is defined for digital communications as the number of
symbols per second. The amount of data per symbol depends on the modulation type. Units
for this field are expressed in Msym/s. The default valid range is 1-54 Msym/s. For more
information, contact your Adtec Digital Sales Representative.
Mode​ - ​ T his control allows the operator to select the expected modulation mode and FEC
code rate for DVB-S. In DVB-S2 / DVB-S2X modes, AUTO is the only valid setting.
Rolloff​ - ​ T he rolloff selection will determine the shape of the input filter. This is
recommended to be set to AUTO. The occupied bandwidth of the modulated signal is the
symbol rate multiplied by (1+?) where alpha (?) is the rolloff factor (%). By using a lower
alpha, carriers can be spaced closer together on a given transponder or an increased symbol
rate can be realized for a given bandwidth.
Multistream Mode​ - ​ M ultistream mode configures the receiver for Multistream Mode
(Enabled) or Singlestream Mode (Disabled, Default). If the receiver is operating in
Multistream Mode, an ISI value must be entered.
Multistream ISI​ - ​ M ultistream ISI (input stream identifier) is required for multistream
applications. If Multistream Mode is enabled, BBHeaders containing this value will be
demodulated and output to the receiver.
PLS Code​ - PLS Code determines the Gold sequence code to use for physical layer
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