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SDM-300A Satellite Modem
3.3.13.1
Utility Modulator
Refer to Figure 3-17.
UTILITY
ASSIGN TRANSMIT
FILTERS
MOD POWER OFFSET
MODULATOR TYPE
Rev. 4
If CR/DR is blank, ENTER CR: _____ code and DR one time only.
If CR/DR is displayed, DR: ________ kb, fixed code/data rate is shown.
Transmit code rate/type selection. Select one of the following or a variable rate
selection (V), as follows:
TX-x QPSK 1/2
Code Rate
BPSK 1/2
QPSK 1/2
QPSK 3/4
QPSK 7/8
8PSK 2/3
OQPSK 1/2
OQPSK 3/4
OQPSK 7/8
BPSK 1/1
QPSK 1/1
Notes:
1. Max Symbol Rate: 2500 kbit/s
2. Max Data Rate for Low Var Rate: 512.0 kbit/s.
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.
Note: When the TX rate has been programmed, the transmitter is automatically turned
off to prevent swamping of other channels. To turn the transmitter on, use the TX-IF
Output function.
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.
Transmit filter type select. Select one of the following for network filtering:
INTELSAT OPEN
EFD CLOSED
CSC CLOSED
Note: TX filter type is selectable only when CUSTOM is selected for the modem type
in the Utility Modem Type menu.
Data Rate Range
2.4 to 1250 kbit/s
4.8 to 2500 kbit/s
7.2 to 3750 kbit/s
8.4 to 4375 kbit/s
64 to 5000 kbit/s
4.8 to 2500 kbit/s
7.2 to 3750 kbit/s
8.4 to 4375 kbit/s
4.8 to 2500 kbit/s
9.6 to 5000 kbit/s
FDC CLOSED
SDM-51 COMPATIBLE
Operation
3–51
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