Comtech EF Data SDM-100A - Manual (Page 103)

SDM-100A Satellite Modem Operation
Rev. 0 3–69
3.2.2.5.1 Utility Modulator: Type 1 Operation
Assign Transmit Filters Transmit filter display/assignment utility. Used to make filter rate
reassignments.
The modulator has five symbol rate filter presets. Filters are
designated as A, B, C, D, and V.
Note: Switching between Modem types will reset the Filter presets
to their factory-defined values.
To view the current preset assignments, press [ENTER]
when the
“Assign Transmit Fltrs” selection is displayed from the “UTILITY
FUNCTIONS” menu.
On line 1 of the display will be “TX-A,” which indicates transmitter
filter A. Following “TX-A” on line 1 will be the code rate (1/2, 3/4, or
7/8).
On line 2 will be the data rate assigned to preset “A.” Press [
← ] or
[ → ] to see the assignments for presets B, C, D, and V (TX-B,
TX-C, TX-D, and TX-V). To change a preset assignment, press
[ENTER]
when the data for that preset is displayed. Press [ ← ] or
[ → ] until the flashing cursor is at the parameter to be changed, then
press [ ↑ ] or [ ↓ ] to change that parameter. When all changes are
made, press [ENTER] to confirm the assignment. If a preset
data/code rate is changed and the modem is currently using that
preset, the modem will be reprogrammed to the new data/code
rate.
Note: These assignments are used for the selection of “TX-R”
(Transmitter Rate) in the configuration functions menu.
Modulator Type Transmit Filter Type Select.
Allows operator to select SDM-51 compatible, CSC Closed, FDC
closed, or EFD Closed network filtering.