Comtech EF Data SDM-9000 - Manual (Page 110)

SDM-9000 Satellite Modem Operation
Rev.4 4–37
4.2.5.1 Utility Modulator
ASSIGN TX FILTERS TX filter display utility. Used to view filter rate assignments.
The modulator has up to four symbol rate filters. Filters are
designated as A, B, C, and D.
To view the assignments, press [ENTER]. TXA appears on
line 1 of the display, which indicates TX filter A. The code
rate follows TXA on line 1. Line 2 displays the data rate
assigned to preset A. Press [
← ] or [ → ] to view the
assignments for B, C, and D (TXB, TXC, and TXD).
Notes:
1. These assignments are used for the selection of TX
rate in the Configuration Functions menu.
2. If the filter is optimized for Reed-Solomon, “+RS” will
be appended to the code rate.
3. Refer to the table in Figure 4-11 for code rates and
data rate ranges.
MOD SPECTRUM Programmable vector rotation. Allows the operator to select
Normal or Inverted for spectrum reversal of the I and Q
baseband channels.
MOD OPTION This program displays the following modulator options:
•
8PSK and 16QAM
•
High Stability
Note: This menu is status only.
MOD POWER OFFSET Modulator power adjust offset. Allows the operator to offset
the modulator output power readout in the Configuration
menu. This feature does not actually change the modulator
power level. The function is to change the actual reading to
display an offset value in the monitor. The modulator power
offset can be set from -40.0 to +40.0 dB, in 0.1 dB steps.
Note: Anything except 0.0 dB will cause “ADJ” to be
displayed in the TX power level screen.
MOD POWER FIXED OFFSET Modulator power fixed (status only). Indicates the power of
a modulator that has been provided with extra gain (+20.0
to -20.0 dBm).
Note: This screen displays the fixed modulator power offset
for nominal high power options. (+10 dBm is standard.)
TX MODULE FIRMWARE Displays the TX module firmware version installed in TX
module. The display includes the month, day, and year.
TX FPGA FIRMWARE Displays the firmware installed in the TX field
programmable gate array. The display includes the month,
day, and year.
FILTER FIRMWARE Displays modulator pre-filter information. The display
includes the month, day, and year.