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SDM-2020 Satellite Demodulator
RX-IF FREQUENCY
LNB POWER
ENERGY DISPERSAL
RS DECODER
BER THRESHOLD
E b /N 0 THRESHOLD
Rev. 3
For L-Band only: Programs the demodulator receive frequency between
950 to 1750 MHz, in 2.5 kHz steps.
For 70/140 MHz only: Programs the demodulator receive frequency
between 50 to 90 MHz and 100 to 180 MHz, in 2.5 kHz steps.
On entry, the current receive frequency is displayed with the 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.
Programs the LNB Power ON or OFF. (Not Available with 70/140 MHz
IF.)
Note: Default is Off.
On entry, the current status of the LNB Power is displayed. Press [↑] or [↓]
to select ON or OFF. Press [ENTER] to execute the change.
Programs the descrambler ON or OFF.
On entry, the current status of the DVB energy dispersal is displayed. Press
[↑] or [↓] to select ON or OFF. Press [ENTER] to execute the change.
Programs the Reed-Solomon correction OFF or ON.
On entry, the current status of the Reed-Solomon decoder is displayed.
Press [↑] or [↓], to select CORR OFF or CORR ON. Press [ENTER] to
execute the change.
CORRECTION OFF MODE: This mode turns off the Reed-Solomon
decoder data error correction circuitry. Data flow is then routed through
normal data paths, without error corrections.
CORRECTION ON MODE: This mode enables the Reed-Solomon
decoder to provide data error corrections.
This function is used to set the BER threshold. If the BER threshold set is
exceeded, a receive alarm will be indicated by the status indicators, also a
receive alarm relay will engage providing external status at the rear panel.
BER threshold may be set for 1E-3 to 1E-8 or may be disabled by
specifying NONE.
On entry, the current setting of the BER threshold is displayed. Press[↑] or
[↓] to select the desired setting. Press [ENTER] to execute the change.
Programs the E b /N 0 target set point. The E b /N 0 target set point ranges
from 3.0 to 16.0 dB, in 0.1 dB steps.
On entry, the current E b /N 0 target set point is displayed with a flashing
cursor. Press [↑] or [↓] to increment the digit at the flashing cursor. Press
[ENTER] to execute the change
Operation
3–11
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