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SDM-309B Satellite Modem
Filter Adjust
Assign TX_Fltrs
Assign RX_Fltrs
MN/U-SDM309B Rev. #
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.
Receive filter display/assignment utility. Used to view current
filter rate assignments and to make filter rate reassignments.
Refer to the previous text under "Assign TX_Fltrs". The
receive filters assignments are basically identical.
Operation
3–39
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