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SLM-7650 Satellite Modem
Operation
Menu Item
SWEEP CENTER
SWEEP RANGE
SWEEP REACQUISITION
RS DECODER
(Correction OFF is a Test Mode
Configuration)
Programs the sweep center frequency for the directed sweep function.
The sweep center frequency can be set in the range from -35000 to +35000 Hz.
On entry, the current programmed setting is displayed with a flashing cursor on
the first character. Press [←] or [→] to move the flashing cursor. Press [↑] or [↓] to
increment or decrement the digit at the flashing cursor. Press [ENTER] 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 to 70000 Hz. When set
at 70000 Hz, the modem is in the normal acquisition mode. Keep the sweep
range narrow for low data rates.
On entry, the current programmed setting is displayed. Press [←] or [→] to move
the flashing cursor. Press [↑] or [↓] to increment or decrement the digit at the
flashing cursor. Press [ENTER] to execute the change. The smaller the range, the
faster the modem will lock, provided the receive carrier center frequency is within
the RX IF frequency sweep range.
Programs the sweep reacquisition mode time duration. This is the time that the
modem will remain in a narrow sweep of the selected range (± 500 Hz) after loss
of acquisition. After this timer runs out, the modem will return to the normal
acquisition sweep. The reacquisition time is 0 to 999 seconds.
On entry, the current programmed setting is displayed with a flashing cursor on
the first character. Press [←] or [→] to move the flashing cursor. Press [↑] or [↓] to
increment or decrement the digit at the flashing cursor. Select the number of
seconds desired for the reacquisition mode. Press [ENTER] to execute the
change.
Programs the Reed-Solomon decoder On, Correction Off, or Off.
ON:
Enables the Reed-Solomon decoder to provide data error corrections.
CORRECTION_OFF:
correction circuitry. Data flow is then routed through normal data
paths without error corrections. Only Viterbi error correction will be
On.
OFF:
The RS decoder is normally disabled (Off position). To execute any of
the Reed-Solomon decoder modes, enter the desired Reed-Solomon
decoder and select the desired mode.
On entry, the current status of the Reed-Solomon decoder is displayed. Use an
arrow key to select the desired mode. Press [ENTER] to execute the change.
3-11
Specifications/usage
Turns off the Reed-Solomon decoder data error
Revision 4
MN/SLM7650.IOM
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