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SDM-300A Satellite Modem
3.3.1
Configuration Modulator
Refer to Figure 3-4.
TX-X CODE_RATE
Rev. 4
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 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.
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
Operation
3–9
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