Comtech EF Data SDM-650B - Manual (Page 175)

SDM-650B Satellite Modem Data Rates and Filters
Rev. 6 A–9
A.2.3 Utility
The following functions are found in the Utility menu. Refer to Chapter 4 for the
functions not mentioned below.
FILTERS ADJUST Variable Rate Filters K Factor Settings.
These are factory set parameters. The operator is not allowed to
view or change these parameters without authorization from an
EFData Customer Support Department representative.
CAUTION
Do not try to enter this mode. An incorrect parameter change
will result in unit failure.
ASSIGN TX_FLTRS Modulator Symbol Rate Assignment.
The modulator has four symbol rate filter assignments. Each filter is
for a specific symbol rate. The data rate and coder rate for each filter
is established upon initial modulator installation and when
circumstances indicate the need to do so. Filters are designated as
A, B, C, and D. To view the current filter assignments, press
[ENTER] when the ASSIGN TX_FLTRS selection is displayed from
the Utility menu. On line 1 of the display will be TXA, which indicates
transmitter filter A. Following TXA 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 filter A. Use
[
← ] and [ → ] to see the assignments for filters B, C, and D (TXB, TXC,
and TXD). To change a filter assignment, press [ENTER] when the
data for that filter is displayed. Use [
← ] and [ → ] until the flashing
cursor is at the parameter to be changed. Then use [ ↑ ] and [ ↓ ] to
change that parameter. When all changes are made, press [ENTER]
to confirm the assignment.
Note: These assignments are used for the selection of TXR in the
Config menu.