Instrument Function
R&S
®
SMBV100A
350Operating Manual 1176.8016.02 ─ 17
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A "Cut Off Frequency Shift" = -1 results in a very narrow-band filter
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Increasing the value up to 1 makes the filter more broad-band
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By "Cut Off Frequency Shift" = 0, the -3 dB point is at the frequency determined by
the half of the selected "Sample Rate".
User filter
The user filter file must have extention *.vaf and can be created with the R&S filter
wizard.
The filter wizard (filtwiz) is a tool from Rohde & Schwarz designed for creating filter
files that can be imported on a R&S SMBV. Its main purpose is the conversion of user-
defined finite impulse response (FIR) filters into the filter format (*.vaf). Beyond this
filtwiz provides designs for standard filters, e.g. Root Raised Cosine, Gaussian.
The program was developed on a 32-bit Microsoft Windows platform under MATLAB.
For more information, refer to the description "Introduction to "filtwiz" Filter Editor" on
the Rohde&Schwarz Internet page.
5.9.3.5 Conflicting Settings - Custom Digital Mod
Having selected a modulation procedure, not every combination is possible when
selecting the settings for the modulation parameters "Symbol Rate" and "Coding".
These restrictions inevitably give rise to conflicting settings if a parameter is changed
and leads to a prohibited combination.
A conflicting setting is indicated by a message on the Info line in the display. The
R&S SMBV displays the setting entered by the user, but the modulation signal actually
generated does not correspond to this display. A conflict of settings can be triggered if
the user changes a parameter inappropriately. The message disappears as soon as a
conflict-free setting is entered.
A list of the possible settings conflicts and messages in digital modulation can be found
in Chapter 9, "Status Information, Error Messages and Troubleshooting", on page 852.
5.9.3.6 Custom Digital Mod User Interface
Baseband Signal - Baseband Block
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