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User Interfaces
4.2.3 Demodulator
Demod IF/RF (menu):
Note: The frequencies of the Block Upconverter (BUC) and LNB must be entered first
under the 'System/General' menu. The LB/ST will then calculate the Mod and Demod
IF/RF frequencies.
Rx RF:
Rx IF:
Spectrum Inv:
Demodulation:
Swp Bounds:
Input Limit:
Demod Data (menu):
Data Rate:
Conv Dec:
Diff Decode:
Descrmbl Sel:
Dscrmbl Ctrl:
Dmd Framing:
Data Invert:
4-6
DMD2401 LB/ST L-Band Satellite Modem and ODU Driver
Displays the currently used Reed-Solomon Interleaver
Depth. In Closed Net Mode, a depth of 4 or 8 may be
selected.
This Frequency is precalculated by the LB/ST after the
operator has entered the frequencies of the BUC and
LNB under the System/General menu.
Enter in 1 MHz steps from 950-1750 MHz
{Normal, Inverted}
Inverts the direction of rotation for PSK modulation.
Normal meets the IESS Specification.
{BPSK, OQPSK, QPSK, 8PSK}
Allows the user to select the demodulation type.
{1 – 42 kHz}
Sets the acquisition range for the demodulator.
{20 – 90 dBm}
{Refer to Table 1-1 for Data Rates}
Allows the user to set the Data Rate in Bps steps via the
Front Panel Arrows or Keypad.
{VIT 1/2, VIT 3/4, VIT 7/8, Optional SEQ 1/2, Optional
SEQ 3/4, Optional SEQ 7/8, Optional TRE 2/3}
Allows the user to select the Rx Code Rate and Type.
{On, Off}
Enables or disables the differential decoder.
{None, V.35-IESS, V.35 CITT, V.35 EF, IBS Reed-
Solomon Scrambler}
Selects the descrambler type.
{Enable, Disable}
Enables or disables descrambler operation.
{1/15 (Async), 1/15 (IBS), 96 Kbps (IDR), None}
Used with IDR, IBS, or Asynchronous Interface Only.
Selects the Frame Type.
{Normal, Inverted}
Allows the user to invert the data.
TM075 – Rev. 1.3
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