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SDM-309B Satellite Modem
SWP-RACQ
**SWP_CNTR
**SWP_RNGE
**SWP_DIR
BERT_set
MN/U-SDM309B Rev. #
Programs the sweep reacquisition mode time duration. The time
selected with this parameter is the time that the modem will remain in
a narrow sweep (± 10%) after acquisition has been accomplished.
After this timer runs out the modem will return to the normal sweep.
On entry the current programmed setting is displayed with a flashing
cursor on the first character. Use the right and left arrow keys to
move the flashing cursor and the up and down arrow keys to
increment and decrement the digit at the flashing cursor. Select the
number of seconds for the reacquisition mode from 0 to 999
seconds. Press the "ENTER" key to execute the change.
Programs the sweep center frequency for the directed sweep
function. The sweep center frequency may be set in the range from
+25000Hz to -25000Hz.
On entry the current programmed setting is displayed with a flashing
cursor on the first character. Use the right and left arrow keys to
move the flashing cursor and the up and down arrow keys to
increment and decrement the digit at the flashing cursor. Select the
sweepcenter frequency from -25000Hz to +25000Hz. Press the
"ENTER" key to execute the change.
When in directed sweep, the value from the sweep monitor screen
(when the modem was last locked) should be entered for the sweep
center frequency.
Programs the overall travel of the sweep width range during
acquisition in the directed sweep mode. The sweep width may be set
from 0 Hz to 50000 Hz. (When set at 50000 Hz, the modem is in the
fast acquisition mode).
On entry the current programmed setting is displayed with a flashing
cursor on the first character. Use the right and left arrow keys to
move the flashing cursor and the up and down arrow keys to
increment and decrement the digit at the flashing cursor. Select a
sweep range from 0 Hz to 50000 Hz. Press the "ENTER" key to
execute the change.
When in directed sweep, the smaller the range is, the faster the
modem will lock, provided the sweep center frequency is close.
Programs the direction of the sweep travel in the directed sweep
mode.
On entry the current programmed setting is displayed with the
flashing cursor on the first character. Use the arrow keys to select
Forward (+) or Reverse (-). Press the "ENTER" key to execute the
change.
This function is used to set the BER threshold.
If the BER threshold set is exceeded a receive fault will be indicated
by the modem status indicators. BER threshold may be set from 1E-
3 to 1E-8 or may be disabled by specifying NONE.
On entry the current setting of the BER threshold is dis played. Use
the up and down arrow keys to select the desired setting. Press the
"ENTER" key to execute the change.
* Indicates Test Mode configuration option.
**These windows only show up when the Fast Acquisition has been
turned on in the "Utility" menu.
Operation
3–7
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