SME Digital Modulation
1038.6002.02 2.99 E-13
FILTER ...
Opens a window to select the filters for 4FSK. The following filters can
be selected::
BESSEL B×T=1.22 cos, 0.2
BESSEL B×T= 1.25
√
cos, 0.2
BESSEL B×T= 2.44
Due to digital filtering, a change of the bit rate influences the cut-off
frequency of the filter. That is why B
×
T (bandwidth
×
symbol duration)
is indicated instead of the cut-off frequency which is specified
according to the standard. The cut-off frequency of the filter is
calculated as follows:
Cut-off frequency = B×T-value × symbol rate
IEC-bus command :SOUR:DM:FSK4:FILT BESS, 1.25
CODING...
Opens a window to select the coding following is to choose from:
APCO25, ERMES, FLEX and MODACOM
IEC-bus command :SOUR:DM:FSK4:COD APCO
MOD POLARITY
Selection of the polarity of the frequency modulation.
NORM Logic "1" generates a positive deviation.
INV Selection of the polarity of the frequency modulation.
IEC-bus command :SOUR:DM:FSK4:POL NORM
SELECT LIST...
Selection of a list or generation of a new list (cf. Section 2.2.4, List
Editor).
DELETE LIST...
Selection of a list or generation of a new list (cf. Section 2.2.4, List
Editor).
FUNCTION
Selection of the editor function to process the list selected (cf. Section
2.2.4, List Editor).
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