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SLM-3650 Satellite Modem
Operation
3.4.14.2
Function Select: Utility: Demodulator
Refer to Figure 3-18.
ASSIGN RECEIVE FILTERS
DEMODULATOR TYPE
DECODER TYPE
RX BPSK ORDERING
DEMOD SPECTRUM
RX-RS INTERLEAVE
TX R-S DUPLEX
TX R-S DUPLEX
RX IESS-310 MODE
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Upon entry, the current receive rate is displayed with the flashing cursor on the first
character of the code rate on Line 1. Line 2 displays the data rate. Press [←] or [→]
to make the selection.
To select the currently defined variable data rate, select RX-V, and press [ENTER]
twice. To change the rate using the variable rate selection, press [ENTER] when
RX-V is displayed. A flashing cursor is displayed on the first character of the coding
type on line 1. Press [←] or [→] to move the flashing cursor, and [↑] or [↓] to
increment or decrement the digit at the flashing cursor. Press [ENTER] to execute
the change.
Refer to 3.3 for Code/Data Rates.
Refer to Table 4-1 for data rate default settings.
Conditional: RX FILTER TYPE is selectable only when Custom is selected for
modem type in the Function Select: Utility: Modem Type menu.
Receive filter type select. Select Type INTELSAT OPEN, EFD CLOSED, CSC
CLOSED, or FDC CLOSED network receive filtering.
Note: CSC Closed Demodulator type is not compatible with a 3/4 Code Rate and
Sequential Decoder type.
Conditional: Changes only when Modem Type (under Function Select: Utility:
Modem Type) is either EFD, Custom, AUPC or ASYNC mode.
Decoder type selection. Select Viterbi, Sequential, or Turbo decoder type. The
modem must have the proper hardware enabled.
Note: A Sequential Decoder type and a 3/4 Code Rate combination is not
compatible with a CSC Closed Demodulator type.
Receive BPSK bit ordering selection. Select STANDARD or NON-STANDARD.
Programmable vector rotation. Select NORMAL or INVERT for spectrum reversal of
the I and Q baseband channels.
Selection of 4, 8, or 16 deep.
Conditional: This menu is active only when Reed-Solomon is installed and RS
Option is ON (under Function Select: Configuration: Demodulator).
N=225, K=205, I=8
Conditional: R-S Duplex must be installed.
Default
Conditional: R-S Duplex must be installed.
Selection of 8-PSK 2/3 with Reed-Solomon.
Conditional: Only available when the 8-PSK option is selected and Reed-Solomon
option is installed and selected.
3–56
Revision 3
MN/SLM3650.IOM
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