Signal generation control
R&S
®
SMW-K52/-K116
43
User Manual 1175.6778.02 ─ 19
[:SOURce<hw>]:BB:DVB:FILTer:PARameter:GAUSs
[:SOURce<hw>]:BB:DVB:FILTer:PARameter:PGAuss
[:SOURce<hw>]:BB:DVB:FILTer:PARameter:SPHase
[:SOURce<hw>]:BB:DVB:FILTer:PARameter:APCO25
[:SOURce<hw>]:BB:DVB:FILTer:ROFactor
Cutoff Frequency Shift
The cutoff frequency is a filter characteristic that defines the frequency at the 3 dB
down point. The "Cut Off Frequency Shift" affects this frequency in the way that the fil-
ter flanks are "moved" and the transition band increases by "Cut Off Frequency
Shift"*"Sample Rate".
●
A "Cut Off Frequency Shift" = -1 results in a very narrow-band filter
●
Increasing the value up to 1 makes the filter more broad-band
●
By "Cut Off Frequency Shift" = 0, the -3 dB point is at the frequency determined by
the half of the selected "Sample Rate".
Tip:
Use this parameter to adjust the cutoff frequency and reach spectrum mask
requirements.
Figure 4-2: Example of the frequency response of a filter with different cutoff frequency shift
Remote command:
[:SOURce<hw>]:BB:DVB:FILTer:PARameter:COSine:COFS
Cutoff Frequency Factor
Sets the value for the cutoff frequency factor. The cutoff frequency of the filter can be
adjusted to reach spectrum mask requirements.
Remote command:
[:SOURce<hw>]:BB:DVB:FILTer:PARameter:LPASs
[:SOURce<hw>]:BB:DVB:FILTer:PARameter:LPASSEVM
Sample/Symbol Rate Variation
"Sample Rate Variation" requires "DVB Standard > DVB-H/T", "Symbol Rate Variation"
requires "DVB Standard > DVB-S2/S2X".
Sets the symbol/sample rate of the signal. A variation of the parameter affects the ARB
clock rate; all other signal parameters remain unchanged.
Filter/clipping settings