Comtech EF Data SDM-100A - Manual (Page 89)

SDM-100A Satellite Modem Operation
Rev. 0 3–55
3.2.2.1 Configuration: Type 1 Operation
TX-X Code_Rate/Type Transmitter rate selection.
One of four predefined transmitter code/data rate combinations
may be selected:
• A
• B
• C
• D
A variable rate selection (V) can also be selected. These
settings must first be set up in the Utility menu.
On entry, the current transmitter rate is displayed with the
flashing cursor on the code rate on line 1. The data rate is
displayed on line 2. Press [
← ] or [ → ] to select one of four
predefined rates. To select the variable data rate, select TX-V
and press [ENTER] twice to select the currently defined data
rate.
To change the rate using the variable rate selection, press
[ENTER] when TX-V is displayed. A flashing cursor will be
displayed on the first character of the coding type on line 1.
Press [
← ] or [ → ] to move the flashing cursor. Press [ ↑ ] or [ ↓ ] to
increment or decrement the digit at the flashing cursor. Press
[ENTER] to execute the change.
To operate BPSK, select TX-V and select BPSK 1/2 for the code
rate. Enter a data rate from 9.6 to 64 kbit/s. Press [ENTER] to
execute the change.
Note: When the TX rate has been changed, the transmitter is
automatically turned off to prevent swamping of other channels.
To turn on the transmitter, use the IF output function.