Comtech EF Data C5 - Manual (Page 175)

C5/K1/K3 Integrated Satellite Terminal System Operation
Rev. 0 4–49
4.1.3.11.2 Utility Demodulator
Refer to Figure 4-16.
ASSIGN RECEIVER
FILTERS Receive filter display/assignment utility. Used to view the current filter
rate assignments and to make filter rate reassignments (A, B, C, D,
and V).
Code Rate Data Rate Range
BPSK 1/2 2.4 to 1250 kbit/s
QPSK 1/2 4.8 to 2500 kbit/s
QPSK 3/4 7.2 to 3750 kbit/s
QPSK 7/8 8.4 to 4375 kbit/s
Notes:
1. Maximum Symbol Rate: 2500 kbit/s
2. Maximum Data Rate for Low Var. Rate: 512 kbit/s
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 [
$] or [%] to change that parameter. After
all changes have been 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 the RX rate in the
Configuration Interface menu.
DEMODULATOR TYPE Receive filter type select. Select Type INTELSAT OPEN, EFD
CLOSED, CSC CLOSED, or FDC CLOSED network receive filtering.
Upon entry, the operational status may be changed. Press [
$] or [%] to
make the selection. Press [ENTER] to execute the change.
Note: RX FILTER TYPE is selectable only when Custom is selected
for modem type in the Utility Modem Type menu.
DECODER TYPE Decoder type selection. Select Viterbi or Sequential decoder type. The
modem must have the proper hardware enabled.
Upon entry, the operational status may be changed. Press [
$] or [%] to
make the selection. Press [ENTER] to execute the change.
Note: This window is only available when Custom or ASYNC mode is
selected for modem type in the Utility Modem Type menu.
RX BPSK ORDERING Receive BPSK bit ordering selection. Select STANDARD or
NON-STANDARD.
Upon entry, the operational status may be changed. Press [
$] or [%] to
make the selection. Press [ENTER] to execute the change.
DEMOD SPECTRUM Programmable vector rotation. Select Normal or Inverted (INVERT) for
spectrum reversal of the I and Q baseband channels.
Upon entry, the operational status may be changed. Press [
$] or [%] to
make the selection. Press [ENTER] to execute the change.
RX SYMBOL RATE Status only.
Displays the current RX Symbol Rate within 4.800 to 2500 kbit/s.