R&S SMBVB-K548 User manual

R&S®SMBVB-K548
Crest Factor Reduction
User Manual
User Manual
Version 01
1179092202
(;Ý9F2)

This document describes the following software options:
●R&S®SMBVB-K548
1423.8820.02
This manual describes firmware version FW 4.70.006.xx and later of the R&S®SMBV100B.
© 2019 Rohde & Schwarz GmbH & Co. KG
Mühldorfstr. 15, 81671 München, Germany
Phone: [phone] - 0
Fax: [phone]
Email: [email protected]
Internet: www.rohde-schwarz.com
Subject to change – Data without tolerance limits is not binding.
R&S® is a registered trademark of Rohde & Schwarz GmbH & Co. KG.
Trade names are trademarks of the owners.
1179.0922.02 | Version 01 | R&S®SMBVB-K548
Throughout this manual, products from Rohde & Schwarz are indicated without the ® symbol , e.g. R&S®SMBV100B is indicated as
R&S SMBVB. Linux® is abbreviated as Linux.

Contents
R&S®SMBVB-K548
3User Manual 1179.0922.02 ─ 01
Contents
1 Preface.................................................................................................... 5
1.1 About this Manual......................................................................................................... 5
1.2 Documentation Overview............................................................................................. 5
1.2.1 Getting Started Manual................................................................................................... 5
1.2.2 User Manuals and Help...................................................................................................6
1.2.3 Service Manual............................................................................................................... 6
1.2.4 Instrument Security Procedures......................................................................................6
1.2.5 Basic Safety Instructions.................................................................................................6
1.2.6 Data Sheets and Brochures............................................................................................ 6
1.2.7 Release Notes and Open Source Acknowledgment (OSA)............................................ 7
1.2.8 Application Notes, Application Cards, White Papers, etc................................................7
2 Welcome to the R&S SMBVB-K548 Option..........................................8
2.1 Accessing the Required Settings................................................................................ 8
2.2 Scope............................................................................................................................. 9
2.3 Notes on Screenshots.................................................................................................. 9
3 About the Crest Factor Reduction......................................................10
4 Crest Factor Reduction Settings........................................................ 11
5 Remote-Control Commands............................................................... 15
List of Commands................................................................................21
Index......................................................................................................22

Contents
R&S®SMBVB-K548
4User Manual 1179.0922.02 ─ 01

Preface
R&S®SMBVB-K548
5User Manual 1179.0922.02 ─ 01
1 Preface
1.1 About this Manual
This user manual provides all the information specific to the options R&S SMBVB-
K548. All general instrument functions and settings common to all applications and
operating modes are described in the main R&S SMBV100B user manual.
The main focus in this manual is on the provided settings and the tasks required to
generate a signal. The following topics are included:
●Welcome to the Crest Facor Reduction option R&S SMBVB-K548
Introduction to and getting familiar with the option
●About the Crest Facor Reduction
Background information on basic terms and principles in the context of the signal
generation
●Configuration and Settings
A concise description of all functions and settings available to configure signal gen-
eration with their corresponding remote control command
●Remote Control Commands
Remote commands required to configure and perform signal generation in a
remote environment, sorted by tasks
(Commands required to set up the instrument or to perform common tasks on the
instrument are provided in the R&S SMBV100B user manual)
Programming examples demonstrate the use of many commands and can usually
be executed directly for test purposes
●List of remote commands
Alphabetical list of all remote commands described in the manual
●Index
1.2 Documentation Overview
This section provides an overview of the R&S SMBV100B user documentation. Unless
specified otherwise, you find the documents on the R&S SMBV100B product page at:
www.rohde-schwarz.com/manual/smbv100b
1.2.1 Getting Started Manual
Introduces the R&S SMBV100B and describes how to set up and start working with the
product. Includes basic operations, typical measurement examples, and general infor-
mation, e.g. safety instructions, etc. A printed version is delivered with the instrument.
Documentation Overview

Preface
R&S®SMBVB-K548
6User Manual 1179.0922.02 ─ 01
1.2.2 User Manuals and Help
Separate manuals for the base unit and the software options are provided for down-
load:
●Base unit manual
Contains the description of all instrument modes and functions. It also provides an
introduction to remote control, a complete description of the remote control com-
mands with programming examples, and information on maintenance, instrument
interfaces and error messages. Includes the contents of the getting started manual.
●Software option manual
Contains the description of the specific functions of an option. Basic information on
operating the R&S SMBV100B is not included.
All user manuals are also available for download or for immediate display on the Inter-
net.
1.2.3 Service Manual
Describes the performance test for checking the rated specifications, module replace-
ment and repair, firmware update, troubleshooting and fault elimination, and contains
mechanical drawings and spare part lists.
The service manual is available for registered users on the global Rohde & Schwarz
information system (GLORIS, https://gloris.rohde-schwarz.com).
1.2.4 Instrument Security Procedures
Deals with security issues when working with the R&S SMBV100B in secure areas. It
is available for download on the Internet.
1.2.5 Basic Safety Instructions
Contains safety instructions, operating conditions and further important information.
The printed document is delivered with the instrument.
1.2.6 Data Sheets and Brochures
The data sheet contains the technical specifications of the R&S SMBV100B. It also
lists the options and their order numbers and optional accessories.
The brochure provides an overview of the instrument and deals with the specific char-
acteristics.
See www.rohde-schwarz.com/brochure-datasheet/smbv100b
Documentation Overview

Preface
R&S®SMBVB-K548
7User Manual 1179.0922.02 ─ 01
1.2.7 Release Notes and Open Source Acknowledgment (OSA)
The release notes list new features, improvements and known issues of the current
firmware version, and describe the firmware installation.
The open source acknowledgment document provides verbatim license texts of the
used open source software.
See www.rohde-schwarz.com/firmware/smbv100b
1.2.8 Application Notes, Application Cards, White Papers, etc.
These documents deal with special applications or background information on particu-
lar topics.
See www.rohde-schwarz.com/application/smbv100b
Documentation Overview

Welcome to the R&S SMBVB-K548 Option
R&S®SMBVB-K548
8User Manual 1179.0922.02 ─ 01
2 Welcome to the R&S SMBVB-K548 Option
The R&S SMBVB-K548 is a software option that allows you to generate signals with
reduced crest factor.
R&S SMBVB-K548 key features
●Reduces the crest factor of a baseband signal through clipping the high signal
peaks and filtering the waveform afterwards.
●Can be applied to any waveform file loaded in the arbitrary waveform generator.
●It uses an iterative process to reach the desired crest factor delta.
●It is possible to adjust the filter characteristics. In simple mode, you can specify the
channel spacing and signal bandwidth. Alternatively in the advanced filter mode
you can specify the lowpass filter through passband and stopband frequencies.
This user manual contains a description of the functionality that the application pro-
vides, including remote control operation.
All functions not discussed in this manual are the same as in the base unit and are
described in the R&S SMBV100B user manual. The latest version is available at:
www.rohde-schwarz.com/manual/SMBV100B
Installation
You can find detailed installation instructions in the delivery of the option or in the
R&S SMBV100B service manual.
2.1 Accessing the Required Settings
1. In the block diagram of the R&S SMBV100B, select the "Baseband" > "ARB".
A dialog box opens that displays the provided general settings.
2. Select "Load Waveform".
Navigate to waveform file and load it.
3. Select "ARB > State > On".
4. Select "Crest Factor Reduction".
The signal generation is started. To apply the crest factor reduction with the default set-
tings, select "State > On".
Accessing the Required Settings

Welcome to the R&S SMBVB-K548 Option
R&S®SMBVB-K548
9User Manual 1179.0922.02 ─ 01
2.2 Scope
Tasks (in manual or remote operation) that are also performed in the base unit in the
same way are not described here.
In particular, it includes:
●Managing settings and data lists, like storing and loading settings, creating and
accessing data lists, or accessing files in a particular directory.
●Information on regular trigger, marker and clock signals and filter settings, if appro-
priate.
●General instrument configuration, such as checking the system configuration, con-
figuring networks and remote operation
●Using the common status registers
For a description of such tasks, see the R&S SMBV100B user manual.
2.3 Notes on Screenshots
When describing the functions of the product, we use sample screenshots. These
screenshots are meant to illustrate as many as possible of the provided functions and
possible interdependencies between parameters. The shown values may not represent
realistic usage scenarios.
The screenshots usually show a fully equipped product, that is: with all options instal-
led. Thus, some functions shown in the screenshots may not be available in your par-
ticular product configuration.
Notes on Screenshots

About the Crest Factor Reduction
R&S®SMBVB-K548
10User Manual 1179.0922.02 ─ 01
3 About the Crest Factor Reduction
Communication standards utilizing higher order modulation techniques or using multi-
ple carrier and complex signals consisting of the signals of more than one digital stan-
dard can feature a high crest factor. The signals of some digital standards can have
high crest factors also particularly with many channels and long sequences.
The crest factor represents the ratio of the peak voltage value to the RMS voltage
value, i.e. the peak to average ratio (PAR). The higher the crest factor and the resulting
dynamics of a signal, the greater the requirement for a power amplifier fed by the sig-
nal to be linear. A high crest factor arises for instance, when in a multi carrier signal the
carriers feature an identical start phase. This is based on the fact that the carriers are
periodically superposed that leads to high peak voltages in relation to the RMS voltage
values.
High crest factors entail two basic problems:
●The nonlinearity of the power amplifier (compression) causes intermodulation
which expands the spectrum (spectral regrowth).
●Since the level of the D/A converter is relative to the maximum value, the average
value is converted with a relatively low resolution. This leads to a high quantization
noise.
Both effects increase the adjacent-channel power.
Applying clipping and filtering
A common and simple approach for achieving a lower PAR is the combination of clip-
ping and filtering.
●Clipping is a technique that applies a wanted distortion to the signal.
The principle includes specifying a threshold, finding out the signal peaks once the
defined limits are exceeded and clipping them off. The level limit is specified as a
percentage of the highest peak value. Because clipping is done before filtering, the
procedure does not influence the spectrum. The error vector magnitude (EVM)
however increases.
However, signal clipping not only changes the peak value but also the average
value and the effect on the crest factor is unpredictable.
●After the clipping, filtering is applied. The used filters are specially designed so
that they filter out the distortion.

Crest Factor Reduction Settings
R&S®SMBVB-K548
11User Manual 1179.0922.02 ─ 01
4 Crest Factor Reduction Settings
Prerequisite: An ARB file is loaded and enabled.
Access:
► Select the "Baseband > ARB > Crest Factor Reduction".
The remote commands required to define these settings are described in Chapter 5,
"Remote-Control Commands", on page 15.
Settings:
State.............................................................................................................................. 11
Generate Waveform...................................................................................................... 12
Algorithm....................................................................................................................... 12
Desired Crest Factor Delta............................................................................................12
Max Iterations................................................................................................................12
Original Crest Factor..................................................................................................... 12
Resulting Crest Factor.................................................................................................. 12
Filter Mode.................................................................................................................... 12
Channel Spacing...........................................................................................................13
Signal Bandwidth.......................................................................................................... 13
Stopband Freqeuncy.....................................................................................................14
Passband Freqeuncy.................................................................................................... 14
Maximum Filter Order................................................................................................... 14
State
Enables the crest factor reduction calculation.
Note: You cannot activate the crest factor reduction and the notch filter simultaneously.
Enabling the notched filter automatically disables the crest factor reduction.
Remote command:
[:SOURce<hw>]:BB:ARBitrary:CFR[:STATe] on page 16

Crest Factor Reduction Settings
R&S®SMBVB-K548
12User Manual 1179.0922.02 ─ 01
Generate Waveform
With enabled signal generation, triggers the instrument to store the current settings in a
waveform file. Waveform files can be further processed.
The filename and the directory it is stored in are user-definable; the predefined file
extension for waveform files is *.wv.
Remote command:
[:SOURce<hw>]:BB:ARBitrary:CFR:WAVeform:CREate on page 20
Algorithm
Displays the algorithm used for the crest factor reduction. The "Clipping and filtering"
algorithm performs a hard clipping. It is followed by a low pass filtering of the result in
an iterative manner until the target crest factor is reached. You can define the settings
of the filter that is used for the calculation.
Remote command:
[:SOURce<hw>]:BB:ARBitrary:CFR:ALGorithm on page 17
Desired Crest Factor Delta
Sets the value difference by which you want to change your crest factor.
Remote command:
[:SOURce<hw>]:BB:ARBitrary:CFR:DCFDelta on page 17
Max Iterations
Sets the number of iterations that are used for calculating the resulting crest factor. The
iteration process is stopped when the desired crest factor delta is achieved by 0.1 dB.
Remote command:
[:SOURce<hw>]:BB:ARBitrary:CFR:ITERations on page 18
Original Crest Factor
Displays the original crest factor of the waveform after the calculation of the resulting
crest factor is completed. The original crest factor is calculated as an average over the
whole waveform, including any idle periods that might be present in TDD waveforms.
Remote command:
[:SOURce<hw>]:BB:ARBitrary:CFR:OCFactor? on page 18
Resulting Crest Factor
Displays the resulting crest factor of the waveform after the calculations are completed.
The resulting crest factor is calculated as an average over the whole waveform, includ-
ing any idle periods that might be present in TDD waveforms.
Remote command:
[:SOURce<hw>]:BB:ARBitrary:CFR:RCFactor? on page 19
Filter Mode
Selects which filter mode is used for the filtering.

Crest Factor Reduction Settings
R&S®SMBVB-K548
13User Manual 1179.0922.02 ─ 01
"Simple" You can specify the RF bandwidth and channel spacing of the signal.
The lowpass filter is designed to pass through frequency components
inside the signal bandwidth and suppress components in the adjacent
channel.
Figure 4-1: Simple filter mode
"Enhanced" In the enhanced filter mode, you can specify the passband and stop-
band frequencies of the lowpass filter.
Figure 4-2: Enhanced filter mode
Remote command:
[:SOURce<hw>]:BB:ARBitrary:CFR:FILTer on page 17
Channel Spacing
Available for "Filter Mode > Simple".
Sets the channel spacing.
Remote command:
[:SOURce<hw>]:BB:ARBitrary:CFR:CSPacing on page 17
Signal Bandwidth
Available for "Filter Mode > Simple".
Sets the signal bandwidth. The value of the "Signal Bandwidth" should not be higher
than the "Channel Spacing".

Crest Factor Reduction Settings
R&S®SMBVB-K548
14User Manual 1179.0922.02 ─ 01
Remote command:
[:SOURce<hw>]:BB:ARBitrary:CFR:SBANdwidth on page 19
Stopband Freqeuncy
Available for "Filter Mode > Enhanced".
Sets the stopband frequency of the filter. Frequency components higher than the stop-
band frequency are filtered out by the lowpass filter.
Remote command:
[:SOURce<hw>]:BB:ARBitrary:CFR:SFReq on page 20
Passband Freqeuncy
Available for "Filter Mode > Enhanced".
Sets the passband frequency. Frequency components lower than the passband fre-
quency are passed through unfiltered.
Remote command:
[:SOURce<hw>]:BB:ARBitrary:CFR:PFReq on page 19
Maximum Filter Order
Available for "Filter Mode > Enhanced".
Sets the maximum filter order.
Remote command:
[:SOURce<hw>]:BB:ARBitrary:CFR:FORDer on page 18

Remote-Control Commands
R&S®SMBVB-K548
15User Manual 1179.0922.02 ─ 01
5 Remote-Control Commands
The following commands are required to perform signal generation in a remote envi-
ronment. We assume that the R&S SMBV100B has already been set up for remote
operation in a network as described in the R&S SMBV100B user manual. Knowledge
about the remote control operation and the SCPI command syntax is assumed.
Conventions used in SCPI command descriptions
For a description of the conventions used in the remote command descriptions, see
section "Remote Control Commands" in the R&S SMBV100B user manual.
Common suffixes
The following common suffixes are used in remote commands:
Suffix Value range Description
SOURce<hw> 1 Available baseband signals
Programming examples
The corresponding sections of the same title provide simple programming examples for
the R&S SMBV100B. The purpose of the examples is to present all commands for a
given task. In real applications, one would rather reduce the examples to an appropri-
ate subset of commands.
The programming examples have been tested with a software tool which provides an
environment for the development and execution of remote tests. To keep the examples
as simple as possible, only the "clean" SCPI syntax elements are reported. Non-exe-
cutable command lines (e.g. comments) start with two // characters.
At the beginning of the most remote control program, an instrument (p) reset is recom-
mended to set the R&S SMBV100B to a definite state. The commands *RST and
SYSTem:PRESet are equivalent for this purpose. *CLS also resets the status registers
and clears the output buffer.
In all the examples, we assume that a remote PC is connected to the instrument, the
remote PC and the instrument are switched on, a connection between them is estab-
lished. We also assume that the security setting "System Config > Setup > Security >
SCPI over LAN" is enabled.

Remote-Control Commands
R&S®SMBVB-K548
16User Manual 1179.0922.02 ─ 01
Example: Configuring the CFR
Prerequisite: An ARB file is loaded and enabled.
SOURce1:BB:ARBitrary:CFR:ALGorithm CLFiltering
SOURce1:BB:ARBitrary:CFR:DCFDelta -3
SOURce1:BB:ARBitrary:CFR:ITERations 5
SOURce1:BB:ARBitrary:CFR:FILTer SIMPle
SOURce1:BB:ARBitrary:CFR:CSPacing 20E6
SOURce1:BB:ARBitrary:CFR:SBANdwidth 18E6
SOURce1:BB:ARBitrary:CFR:STATe ON
SOURce1:BB:ARBitrary:CFR:MEASure:STATe?
//ON
SOURce1:BB:ARBitrary:CFR:OCFactor?
//6
SOURce1:BB:ARBitrary:CFR:RCFactor?
//3
SOURce1:BB:ARBitrary:CFR:CREate "cfr"
Example: Setting up an Enhanced Filter
SOURce1:BB:ARBitrary:CFR:FILTer ENHanced
SOURce1:BB:ARBitrary:CFR:PFReq 9E6
SOURce1:BB:ARBitrary:CFR:SFReq 11E6
SOURce1:BB:ARBitrary:CFR:FORDer 100
The following commands specific to the R&S SMBVB-K548 option are described here:
[:SOURce<hw>]:BB:ARBitrary:CFR[:STATe]....................................................................... 16
[:SOURce<hw>]:BB:ARBitrary:CFR:ALGorithm...................................................................17
[:SOURce<hw>]:BB:ARBitrary:CFR:CSPacing.................................................................... 17
[:SOURce<hw>]:BB:ARBitrary:CFR:DCFDelta.................................................................... 17
[:SOURce<hw>]:BB:ARBitrary:CFR:FILTer......................................................................... 17
[:SOURce<hw>]:BB:ARBitrary:CFR:FORDer...................................................................... 18
[:SOURce<hw>]:BB:ARBitrary:CFR:ITERations.................................................................. 18
[:SOURce<hw>]:BB:ARBitrary:CFR:MEASure[:STATe]?.......................................................18
[:SOURce<hw>]:BB:ARBitrary:CFR:OCFactor?...................................................................18
[:SOURce<hw>]:BB:ARBitrary:CFR:PFReq........................................................................ 19
[:SOURce<hw>]:BB:ARBitrary:CFR:RCFactor?...................................................................19
[:SOURce<hw>]:BB:ARBitrary:CFR:SBANdwidth................................................................ 19
[:SOURce<hw>]:BB:ARBitrary:CFR:SFReq........................................................................ 20
[:SOURce<hw>]:BB:ARBitrary:CFR:WAVeform:CREate....................................................... 20
[:SOURce<hw>]:BB:ARBitrary:CFR[:STATe] <ArbCfrState>
Enables the crest factor reduction calculation.
Parameters:
<ArbCfrState> 0 | 1 | OFF | ON
*RST: 0
Example: See Example "Configuring the CFR" on page 16.
Manual operation: See "State" on page 11

Remote-Control Commands
R&S®SMBVB-K548
17User Manual 1179.0922.02 ─ 01
[:SOURce<hw>]:BB:ARBitrary:CFR:ALGorithm <ArbCfrAlgorithm>
Displays the algorithm used for the crest factor reduction. The "Clipping and filtering"
algorithm performs a hard clipping. It is followed by a low pass filtering of the result in
an iterative manner until the target crest factor is reached. You can define the settings
of the filter that is used for the calculation.
Parameters:
<ArbCfrAlgorithm> CLFiltering
*RST: CLFiltering
Example: See Example "Configuring the CFR" on page 16.
Manual operation: See "Algorithm" on page 12
[:SOURce<hw>]:BB:ARBitrary:CFR:CSPacing <ArbCfrChanSpac>
Sets the channel spacing, if [:SOURce<hw>]:BB:ARBitrary:CFR:FILTer is set to
SIMPle.
Parameters:
<ArbCfrChanSpac> float
Range: 0 to depends on the sample rate of the loaded file
Increment: 0.1
*RST: 250E6
Example: See Example "Configuring the CFR" on page 16.
Manual operation: See "Channel Spacing" on page 13
[:SOURce<hw>]:BB:ARBitrary:CFR:DCFDelta <ArbCfrDCFDelta>
Sets the value difference by which you want to change your crest factor.
Parameters:
<ArbCfrDCFDelta> float
Range: -20 to 0
Increment: 0.1
*RST: -3
Example: See Example "Configuring the CFR" on page 16.
Manual operation: See "Desired Crest Factor Delta" on page 12
[:SOURce<hw>]:BB:ARBitrary:CFR:FILTer <ArbCfrFilterMod>
Selects which filter mode is used for the filtering.
Parameters:
<ArbCfrFilterMod> SIMPle | ENHanced
*RST: SIMPle
Example: See Example "Configuring the CFR" on page 16.

Remote-Control Commands
R&S®SMBVB-K548
18User Manual 1179.0922.02 ─ 01
Manual operation: See "Filter Mode" on page 12
[:SOURce<hw>]:BB:ARBitrary:CFR:FORDer <ArbCfrMaxFilOrd>
Sets the maximum filter order, if [:SOURce<hw>]:BB:ARBitrary:CFR:FILTer is
set to ENHanced.
Parameters:
<ArbCfrMaxFilOrd> integer
Range: 0 to 300
*RST: 100
Example: See Example "Configuring the CFR" on page 16.
Manual operation: See "Maximum Filter Order" on page 14
[:SOURce<hw>]:BB:ARBitrary:CFR:ITERations <ArbCfrMaxIter>
Sets the number of iterations that are used for calculating the resulting crest factor. The
iteration process is stopped when the desired crest factor delta is achieved by 0.1 dB.
Parameters:
<ArbCfrMaxIter> integer
Range: 1 to 10
*RST: 5
Example: See Example "Configuring the CFR" on page 16.
Manual operation: See "Max Iterations" on page 12
[:SOURce<hw>]:BB:ARBitrary:CFR:MEASure[:STATe]?
Queries the state of the crest factor reduction calculation.
Return values:
<MeasureState> 0 | 1 | OFF | ON
ON: the original and resulting crest factors are already calcula-
ted.
*RST: 0
Example: See Example "Configuring the CFR" on page 16.
Usage: Query only
[:SOURce<hw>]:BB:ARBitrary:CFR:OCFactor?
Queries the original crest factor of the waveform after the calculation of the resulting
crest factor is completed. The original crest factor is calculated as an average over the
whole waveform, including any idle periods that might be present in TDD waveforms.

Remote-Control Commands
R&S®SMBVB-K548
19User Manual 1179.0922.02 ─ 01
Return values:
<ArbCfrOCrestFac> float
Range: 1 to 100
Increment: 0.01
*RST: 6
Example: See Example "Configuring the CFR" on page 16.
Usage: Query only
Manual operation: See "Original Crest Factor" on page 12
[:SOURce<hw>]:BB:ARBitrary:CFR:PFReq <ArbCfrPassBFreq>
Sets the passband frequency, if [:SOURce<hw>]:BB:ARBitrary:CFR:FILTer is
set to ENHanced. Frequency components lower than the passband frequency are
passed through unfiltered.
Parameters:
<ArbCfrPassBFreq> float
Range: 0 to depends on the sample rate of the loaded file
Increment: 0.1
*RST: 250E6
Example: See Example "Setting up an Enhanced Filter" on page 16.
Manual operation: See "Passband Freqeuncy" on page 14
[:SOURce<hw>]:BB:ARBitrary:CFR:RCFactor?
Queries the resulting crest factor of the waveform after the calculations are completed.
The resulting crest factor is calculated as an average over the whole waveform, includ-
ing any idle periods that might be present in TDD waveforms.
Return values:
<ArbCfrResCreFac> float
Range: 1 to 100
Increment: 0.1
*RST: 6
Example: See Example "Configuring the CFR" on page 16.
Usage: Query only
Manual operation: See "Resulting Crest Factor" on page 12
[:SOURce<hw>]:BB:ARBitrary:CFR:SBANdwidth <ArbCfrSignalBw>
Sets the signal bandwidth, if [:SOURce<hw>]:BB:ARBitrary:CFR:FILTer is set
to SIMPle.
The value of the signal bandwidth should not be higher than the channel spacing ([:
SOURce<hw>]:BB:ARBitrary:CFR:CSPacing).

Remote-Control Commands
R&S®SMBVB-K548
20User Manual 1179.0922.02 ─ 01
Parameters:
<ArbCfrSignalBw> float
Range: 0 to depends on the sample rate of the loaded file
Increment: 0.1
*RST: 250E6
Example: See Example "Configuring the CFR" on page 16.
Manual operation: See "Signal Bandwidth" on page 13
[:SOURce<hw>]:BB:ARBitrary:CFR:SFReq <ArbCfrStopBFreq>
Sets the stopband frequency of the filter, if [:SOURce<hw>]:BB:ARBitrary:CFR:
FILTer is set to ENHanced. Frequency components higher than the stopband fre-
quency are filtered out by the lowpass filter.
Parameters:
<ArbCfrStopBFreq> float
Range: 0 to depends on the sample rate of the loaded file
Increment: 0.1
*RST: 250E6
Example: See Example "Setting up an Enhanced Filter" on page 16.
Manual operation: See "Stopband Freqeuncy" on page 14
[:SOURce<hw>]:BB:ARBitrary:CFR:WAVeform:CREate <CreateWvFile>
With enabled signal generation, triggers the instrument to store the current settings in a
waveform file. Waveform files can be further processed.
The filename and the directory it is stored in are user-definable; the predefined file
extension for waveform files is *.wv.
Setting parameters:
<CreateWvFile> string
Example: See Example "Configuring the CFR" on page 16.
Usage: Setting only
Manual operation: See "Generate Waveform" on page 12