Comtech EF Data SDM-300L3 - Manual (Page 153)

SDM-300L3 Satellite Modem Revision 1
Front Panel Operation MN/SDM300L3.IOM
4–85
Select one of four (A, B, C, or D) pre-defined transmitter code/data rate combinations or
a variable rate selection (V).
Code Rate Data Rate Range
Non-Turbo Requirements
BPSK 1/2 2.4 to 1250 kbps
{O}QPSK 1/2 4.8 to 2500 kbps
{O}QPSK 3/4 7.2 to 3750 kbps
QPSK 7/8 8.4 to 4375 kbps
8-PSK 2/3 64.0 to 5000 kbps
BPSK 1/1 4.8 to 2500 kbps
{O}QPSK 1/1 9.6 to 5000 kbps
Turbo Requirements
BPSK 21/44 2.4 to 1193.181 kbps
BPSK 5/16 2.4 to 781.25 kbps
{O}QPSK 1/2 4.8 to 2386.363 kbps
8-PSK 3/4 384 to 5000 kbps
Burst Mode Data Range
BPSK 5/16
2.4 to 781.25 kbps
(O)QPSK 1/2 4.8 to 2386.363 kbps
8-PSK 3/4 384 to 5000 kbps
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
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 twice.
To change the rate using the variable rate selection, press 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 to execute the change.
Notes:
1. When the TX rate has been programmed, the transmitter is automatically turned
off to prevent swamping of other channels.
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
Type and Sequential Encoder.