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SLM-3650 Satellite Modem
Operation
3.4.14.1
Function Select: Utility: Modulator
Refer to Figure 3-17.
UTILITY
ASSIGN TRANSMIT FILTERS
MOD POWER OFFSET
MODULATOR TYPE
ENCODER TYPE
TX BPSK ORDERING
MOD SPECTRUM
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Displays either Single Code/Data Rate modem only.
•
If CR/DR is blank, user is permitted to enter CR:__________ code and data rate
one time.
•
If CR/DR is displayed, DR:__________kb, then fixed code/data rate is shown.
Upon entry, the current status of the utility menu is displayed. Press [↑] or [↓] to make the
selection. Press [ENTER] to execute the change.
Upon entry, the current transmitter 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 TX-V, and press [ENTER] twice.
To change the rate using the variable rate selection, press [ENTER] when TX-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 Data Rates
Refer to Table 4-1 for code/data rates Default settings
Modulator power offset adjust. Offsets the modulator output power readout in the
Configuration menu. This feature does not actually change the modulator power level, but
displays an offset value in the monitor. The modulator power offset range is -99.9 to +99.9
dB, in 0.1 dB steps.
Note: Anything except 0.0 dB will cause ADJ to be displayed for the TX power level.
TX filter type select. Select INTELSAT OPEN, EFD CLOSED, CSC CLOSED, FDC
CLOSED, or SDM-51 COMPATIBLE network filtering.
Notes:
1.
Selectable only when EFD, ASYNC, AUPC, or CUSTOM is selected for the
modem type in the Utility: Modem Type menu.
2.
CSC CLOSED Modulator Type is not compatible with a 3/4 Code Rate and
Sequential Encoder type combination.
Encoder type selection. Select Viterbi, Sequential, or Turbo encoder type.
Notes:
1.
Selectable only when EFD, ASYNC, AUPC, or CUSTOM is selected for the
modem type in the Utility: Modem Type menu.
2.
CSC CLOSED Modulator Type is not compatible with a 3/4 Code Rate and
Sequential Encoder type combination.
TX BPSK bit ordering selection. Select STANDARD or NON-STANDARD.
Upon entry, the current status of the utility menu is displayed. Press [↑] or [↓] to make the
selection. Press [ENTER] to execute the change.
Programmable vector rotation allows the operator to select NORMAL or INVERT for
spectrum reversal of the I and Q baseband channels.
Upon entry, the current status of the utility menu is displayed. Press [↑] or [↓] to make the
selection. Press [ENTER] to execute the change.
3–53
Revision 3
MN/SLM3650.IOM
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