Digital Modulation SME
1038.6002.02 2.96 E-13
FILTER...
Opens a window to select the filters. The following filters can be selected:
OFF
BESSEL B×T=1.22 (corresponds to a bandwidth of 3.9 kHz at 3.2 kbps)
BESSEL B×T=2.44 (corresponds to a bandwidth of 3.9 kHz at 1.6 kbps)
GAUSS B×T=2.73 (corresponds to a rise time 250 µs at 512 bps)
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:FSK:FILT BESS, 1.22
MOD POLARITY
Selection of the polarity of the frequency modulation.
NORM Logic "1" generates a positive deviation.
INV Logic "1" generates a negative deviation.
IEC-bus command :SOUR:DM:FSK:POL NORM
SELECT LIST...
Selection of a list or generation of a new list (cf. Section 2.2.4, List Editor).
DELETE LIST...
Deletion of a list (cf. Section 2.2.4, List Editor).
FUNCTION
Deletion of a list (cf. Section 2.2.4, List Editor).
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