Digital Modulation SME
1038.6002.02 2.98 E-13
SOURCE
Selection of the modulation source for 4FSK.
IEC-bus command :SOUR:DM:TYPE FSK4; SOUR EXT; STAT ON
PRBS
Selection of the Pseudo Random Binary Sequence..
IEC-bus command :SOUR:DM:PRBS 9
CLOCK ...
Opens a window to set the clock parameters. The current settings are
displayed (cf. Section "QPSK modulation")
LEVEL ATTENUATION MODE
Selection of the operating mode for level reduction
OFF The level reduction is switched off.
NORM The level reduction corresponds to the value entered in
LEVEL ATTENUATION. The linear range extends to an
attenuation of approx. 30 dB.
MAX The level reduction is set to a maximum attenuation of
>80dB.
IEC-bus command :SOUR:DM:DATA:ALEV:MODE NORM
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
EXECUTE SINGLE MODE Ð
Starts a single servicing of the data. These action to be executed is
only displayed and is only effective if MODE is set to SINGLE.
IEC-bus commands :TRIG:DM:SOUR SING; :TRIG:DM
SELECT STANDARD...
Opens a window to select one of the standard 4FSK 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:FSK4:STAN ERM
DEVIATION
Input value of the deviation for 4FSK. The maximum setting depends
on the carrier frequency and is limited to 20% of the analog FM
deviation.
IEC-bus command :SOUR:DM:FSK4:DEV 4.6875 kHz
BIT RATE
Input value of the bit rate for 4FSK.
Setting range: 1 to 24.3 kbps and 27 to 48.6 kbps.
IEC-bus command :SOUR:DM:FSK4:BRAT 6250b/s
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