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SDM-300L3 Satellite Modem
Front Panel Operation
Select one of four (A, B, C, or D) pre-defined transmitter code/data rate combinations or
a variable rate selection (V).
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.
Notes:
1. When the TX rate has been programmed, the transmitter is automatically turned
2. To turn the transmitter on, use the TX-IF Output function.
3. Code Rate 3/4 not compatible with a combination of a CSC Closed Modulator
Code Rate
Non-Turbo Requirements
BPSK 1/2
{O}QPSK 1/2
{O}QPSK 3/4
QPSK 7/8
8-PSK 2/3
BPSK 1/1
{O}QPSK 1/1
Turbo Requirements
BPSK 21/44
BPSK 5/16
{O}QPSK 1/2
8-PSK 3/4
Burst Mode Data Range
BPSK 5/16
(O)QPSK 1/2
8-PSK 3/4
Notes:
1. Max Symbol Rate = 2500 ksps
2. Max Data Rate for Low Var. Rate: 512 kbps.
3. OQPSK Option only: OQPSK 1/2, 3/4, and 7/8
off to prevent swamping of other channels.
Type and Sequential Encoder.
Data Rate Range
2.4 to 1250 kbps
4.8 to 2500 kbps
7.2 to 3750 kbps
8.4 to 4375 kbps
64.0 to 5000 kbps
4.8 to 2500 kbps
9.6 to 5000 kbps
2.4 to 1193.181 kbps
2.4 to 781.25 kbps
4.8 to 2386.363 kbps
384 to 5000 kbps
2.4 to 781.25 kbps
4.8 to 2386.363 kbps
384 to 5000 kbps
4–85
Revision 1
MN/SDM300L3.IOM
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