SME Digital Modulation
1038.6002.02 2.89 E-13
2.6.3.6 GFSK Modulation
Menu DIGITAL MOD - GFSK offers access to settings for GFSK modulation.
Menu selection: DIGITAL MOD - GFSK
FREQUENCY
LEVEL
MODULATION
DIGITAL MOD
LF OUTPUT
SWEEP
LIST
MEM SEQ
UTILITIES
HELP
GMSK
GFSK
QPSK
FSK
4FSK
FFSK
FREQ
100. 000 000 0
MHz
L
E
V
EL
dBm
SOURCE
OFF EXT PRBS DATA
PRBS 9 15 20 21 23 Bit
CLOCK... POS / COUPLED
LEVEL ATTENUATION MODE OFF NORM MAX DECT-SLOPE
LEVEL ATTENUATION 0.0 dB
MODE AUTO SINGLE
SELECT STANDARD... CURRENT: DECT
BIT RATE... 1.152 Mbps
FILTER B*T/DEVIATION... B*T=0.5/DEV=288 kHz
MOD POLARITY NORM INV
SELECT LIST... CURRENT: DLIST2
DELETE LIST...
FUNCTION FILL INSERT DELETE EDIT/VIEV
CONFIG XMEM...
- 30.0
Fig. 2-42 Menu DIGITAL MOD-GFSK (preset setting), fitted with option SME-B11, DM coder
SOURCE
Selection of the modulation source for GFSK.
IEC-bus command :SOUR:
DM:TYPE GFSK; 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.
DECT-SLOPE
The rise and fall time of the level reduction are filtered.
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
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