SME Digital Modulation
1038.6002.02 2.93 E-13
LEVEL ATTENUATION
Input value of the level reduction. The level reduction is internally
controlled by the LEV ATT bits in the data list or externally via
connector BURST. A logic "1" in the data list causes a level reduction.
IEC-bus command :SOUR:DM:DATA:ALEV 0dB
MODE
Selection of the operating mode for the DATA generator.
AUTO The data are always repeated.
SINGLE The data are sent once as soon as the run has been
started using EXECUTE SINGLE MODE
➤
IEC-bus command :TRIG:DM:SOUR AUTO
SELECT STANDARD...
Opens a window to select one of the standard QPSK modulations (see
Table 2-5). By selecting a standard, the parameters indented below
the line SELECT STANDARD are set according to standard. If the
setting of a parameter is different from the standard, SELECT
STANDARD... CURRENT:USER is displayed.
IEC-bus command :SOUR:DM:QPSK:STAN NADC
MOD TYPE...
Opens a window to select modulation type. The following is to choose
of:
QPSK, OQPSK,
π
/4QPSK,
π
/4DQPSK
IEC-bus command :SOUR:DM:QPSK:TYPE QPSK
BITRATE
Input value of the bit rate. The specified ranges are 1 to 24.3 kbps and
27 to 48.6 kbps. In the range 1 to 24.3 kbps, the nonharmonic
suppression is reduced (cf. diagram).
IEC-bus command :SOUR:DM:QPSK:BRAT 48.6kb/s
FILTER..
Opens a window to select filtering (roll-off factor).
The following is to choose from:
OFF cos / 0,2
cos /0,35,
√
cos /0,35,
cos /0,4,
√
cos /0,4,
cos /0,5,
√
cos /0,5,
cos/0,6
√
cos /0,6.
Note: For modulation type OQPSK only
√
cos/0.6 can be set.
IEC-bus command :SOUR:DM:QPSK:FILT SCOS,0.35
CODING...
Selection of difference coding. The following is to choose from:
NADC, PDC, TETRA, APCO, TFTS, MSAT and INMARSAT
IEC-bus command :SOUR:DM:QPSK:COD NADC
MOD POLARITY
Selection of the polarity of the modulation excursion.
NORM Polarity of the modulation is specified according to standards.
INV Polarity of the modulation is inverted.
IEC-bus command :SOUR:DM:QPSK:POL NORM
DELETE LIST...
Deletion of a list (cf. Section 2.2.4, List Editor).
FUNCTION
Selection of the editor function to process the selected list (cf. Section
2.2.4, List Editor).
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