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Operation
OP MODE
Fast ACQ
INTRFACE
Filter Adjust
Assign TX_Fltrs
3–14
Operation Mode. Programs the modem operation for TX
only, RX only, or Duplex operation.
On entry the flashing cursor is on the first character of the
display. Use the arrow keys to select TX only, RX only, or
Duplex. Press the "ENTER" key to execute the change.
When TX only or RX only is selected, the appropriate faults
are masked from the Faults and Stored Faults menu.
Fast Acquisition function.
Turns the fast acquisition and directed sweep function ON
or OFF. When the fast acquisition has been turned OFF,
the Swp_Cntr, SWP_Rnge and SWP_DIR windows in the
configuration menu are disabled and do not appear. Also,
in the "Monitor" menu, Swp_Freq will not appear. When
turned "OFF" fast acquisition does not occur.
This is a monitor function that displays the interface that
has been selected on the M&C card. No changes are
accepted from the front panel.
Variable Rate Filters K factor settings. This is a factory
setting and the operator is not allowed to enter this
parameter without authorization from EFData service
department. Failure to comply will result in a modem
failure.
Transmit filter display/assignment utility. Used to view
current filter rate assignments and to make filter rate
reassignments. The modulator has four symbol rate filters.
Each filter is for a specific symbol rate. The data rate and
code rate for each filter must be 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 the "ENTER"
key when the "Assign TX_Fltrs" selection is displayed from
the utility functions menu. On line one of the display will be
TXA" which indicates transmitter filter A. Following "TXA"
on line one will be the code rate (1/2 or 3/4) or "N/A" which
indicates that the filter is not assigned. On line two will be
the data rate assigned to filter "A". Use the right and left
arrow keys to see the assignments for filters B, C, and D
(TXB, TXC, and TXD).
If it is desired to change a filter assignment press the
"ENTER" key when the data for that filter is displayed. Use
the right and left arrow keys until the flashing cursor is at
the parameter to be changed. Then use the up and down
arrow keys to change that parameter. When all changes
are made press the "Enter" key to confirm the assignment.
Some filters may have parameters preprogrammed in the
filter board hardware. If the filter parameters are
preprogrammed the previously described programming
techniques will be disabled.
Note: These assignments are used for the selection of
"TXR" (Transmitter Rate) in the configuration functions
menu.
The parameter "N/A" is used to indicate that the specific
filter is not present.
SDM-309B Satellite Modem
MN/U-SDM309B Rev. #
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