Specifications

SDM-300L3 Satellite Modem Revision 0
Front Panel Operation MN/SDM300L3.IOM
4–84
Select one of four (A, B, C, or D) pre-defined receiver 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
8PSK 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
8PSK 3/4 384 to 5000 kbps
Upon entry, the current receive 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 RX rate has been programmed, the receiver is automatically turned off
to prevent swamping of other channels. To turn the receiver on, use the RX-IF
Output function.
2. Code Rate 3/4 not compatible with a combination of a CSC Closed Modulator
Type and Sequential Encoder.
FUNCTION SELECT:UTILITY: DEMODULATOR:
RX TERMINAL LO