Comtech EF Data SDM-650B - Manual (Page 279)

SDM-650B Satellite Modem Asynchronous Overhead Channel Unit
Rev. 5 F–21
F.5.2.1.1 Configuration Modulator
Refer to Table F-4.
TX-x Transmitter Rate Selection. Select one of four pre-defined transmitter
coder/data rate combinations or a variable rate selection.
On entry, the current transmitter rate is displayed with the flashing cursor
on the first character of the code rate on line 1. The data rate is displayed
on line 2. Use the arrow keys to select one of four pre-defined rates.
Filters that are not present may display N/A (not assigned). They cannot
be programmed. If the modem is equipped with the variable rate option,
TXV can also be selected. Enter the desired data rate.
TX_Freq Programs the modulator transmit frequency between 50 and 90 MHz, or
100 and 180 MHz, in 2.5 kHz steps.
On entry, the current transmitter frequency is displayed with the flashing
cursor on the first character. Use [
← ] and [ → ] to move the flashing
cursor. Use [ ↑ ] and [ ↓ ] to increment or decrement the digit at the flashing
cursor. Press [ENTER] to execute the change.
Note: The transmitter frequency is programmable within the specified
range (50 to 90 MHz, or 100 to 180 MHz), in 2.5 kHz steps. When the
transmitter frequency is changed, the transmitter is automatically turned
OFF to prevent the possible swamping of other channels. Use the
RF_Out function to turn the transmitter ON.
RF_Out Programs the modulator output to ON or OFF.
On entry, the current status of the output is displayed with the flashing
cursor on the first character. Use the arrow keys to select ON or OFF.
Press [ENTER] to execute the change.
TX_Power Programs the modulator output power level from -5 dB to -30 dBm, in 0.5
dB steps.
On entry, the current transmitter power level is displayed with the flashing
cursor on the first character. [
↑ ] and [ ↓ ] are used to increase or decrease
the output power level in 0.5 dBm steps. Press [ENTER] to execute the
change.
AUPC_PWR AUPC status window.
When AUPC is turned ON in the AUPC Config menu, this window
replaces the TX_POWER window. This is a monitor point only, and
cannot be programmed from this menu.
DifEncdr Programs the differential encoder ON or OFF.
On entry, the current status of the DifEncdr is displayed with the flashing
cursor on the first character. Use the arrow keys to select ON or OFF.
Press [ENTER] to execute the change.
Scramblr Programs the modulator for scrambler ON or OFF.
On entry, the current status of the scrambler is displayed with the
flashing cursor on the first character. Use the arrow keys to select ON or
OFF. Press [ENTER] to execute the change.