SME Digital Modulation
1038.6002.02 2.87 E-13
2.6.3.5 GMSK Modulation
Menu DIGITAL MOD-GMSK offers access to settings for GMSK modulation.
Menu selection: DIGITAL MOD - GMSK
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 GSM-SLOPE
LEVEL ATTENUATION 0.0 dB
MODE AUTO SINGLE
SELECT STANDARD... CURRENT: GSM/PCN
FILTER / BIT RATE... B*T 0.3 / 270.833 kbps
DIFF ENCODER OFF ON
MOD POLARITY NORM INV
SELECT LIST... CURRENT: DLIST1
DELETE LIST...
FUNCTION FILL INSERT DELETE EDIT/VIEV
- 30.0
Fig. 2-41 Menu DIGITAL-MOD-GMSK (preset setting), fitted with option SME-B11, DM coder
SOURCE
Selection of the modulation source for GMSK.
OFF GMSK is switched off
EXT GMSK with external data signals
PRBS GMSK with pseudo random binary sequence
DATA GMSK with internally stored data sequence
IEC-bus command:SOUR:DM:TYPE:GMSK; 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.
GSM SLOPE The rise and fall time of the level reduction correspond
to GSM power ramping
IEC-bus command :SOUR:DM:DATA:ALEV:MODE NORM
:SOUR:DM:GMSK:GSL ON
To Next Page
Loading...
