The R&S®GX430 provides a signal overview using a high-speed spectrum/waterfall display; it supports
the monitoring of known signals (demodulation and decoding to content level) and supports
surveillance/search operation by detecting signals of interest and performing a classification
(recognition of modulation type and transmission system/code) automatically.
For complex (very dense, weak, or disturbed) signal scenarios, the user can overrule the automatic
signal processing and set up the classifier or demodulator/decoder to the signal of interest manually. An
additional time domain analysis provides manual measurement of technical signal parameters.
The search and classify application provides a fully automatic mode to scan a frequency range, detect
all signals of interest, classify these signals and store the results for later processing.
Signal data (digital IF) can be recorded on the computer hard disk and replayed in offline mode for
processing.
®
The R&S
•Signal acquisition and receiver control
GX430 offers the following:
•Manual signal measurement
•Automatic modulation type and transmission system classification
•Comprehensive library of demodulators and decoders
•Automatic search and classification application
•Signal recording and replay on/from hard disk
®
The R&S
decoding of digital and analog IF signals. The software provides powerful signal analysis and signal
processing functions running on an MS Windows PC connected to modern Rohde & Schwarz receivers
via LAN or to any other receivers via soundcard audio input.
GX430 is a standalone software solution for analysis, classification, demodulation, and
1.1 R&S®GX430 Concept and Workflow
The R&S®GX430 processes digital IF signal data, covering the following:
•Online digital IF data (AMMOS IF format) provided by various Rohde & Schwarz receivers
(EM050, EM510, EM550, ESMB, EB200, ESMD)
•Online analog IF data digitized via soundcard
•Offline replay of digital IF data (AMMOS IF format); the signal sample can be an IF file recorded
with the R&S
for narrowband/wideband interception)
•Offline replay of WAV file
®
GX430 or an imported IF file (e.g. from the R&S®GX420 recording component
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R&S GX430 Characteristics
Processing of signal data and calculation of a spectrum/waterfall
The frequency range is presented using a real time waterfall up to 1000 lines/s. Signal attributes can be
measured by using time and frequency axis cursors.
Signal recording and replay on/from hard disk
By activating the IF recording, a signal sample is stored on the computer hard disk for later IF replay or
IF export (such as to the R&S
®
GX400 or the R&S®GX410 system).
By using an audio demodulator, (analog) emissions can be listened to and recorded to WAV files on the
computer hard disk.
Figure 1: Online spectrum /waterfall
Manual or automatic demodulation and decoding
Demodulators and decoders can be set manually by the operator or automatically by the R&S
modulation and transmission system classifier. For a list of demodulators and decoders included in the
®
GX430, please refer to the datasheet. This list will be continuously expanded.
R&S
®
GX430
Customer-specific decoders
Customer-specific decoders (developed with the R&S
customer-specific demodulators can be installed on the R&S
®
GX400ID decoder development equipment) and
®
GX430 to expand the
demodulation/decoding capability.
®
Powerful R&S
The R&S
®
AMMOS classification unit
GX430 contains the powerful R&S®AMMOS classification unit for the HF and VHF/UHF
frequency range and can recognize the modulation type and transmission system of a huge variety of
analog and digital signals.
The classification algorithm provides a segmentation and modulation analysis result. The segmentation
process determines the accurate center frequency and bandwidth of the signal. The modulation
analysis determines the modulation type as well as all relevant modulation parameters (symbol rate,
frequency shift, etc.).
Comprehensive library of demodulators and decoders
®
The classifier results are used to automatically parameterize a demodulator from the R&S
demodulation library. The resulting symbol/bit stream can be analyzed by using the transmission
system recognition and can be decoded by using the decoders of the R&S
®
AMMOS decoding library.
AMMOS
4071.5546.32-08.00 1-2
Characteristics R&S GX430
Customer-specific decoders which are developed with the
®
R&S
GX400ID decoder development equipment and are installed on the R&S®GX430 are also used
in the classification process. Symbol/bit stream data can be exported for further bit stream analysis with
the R&S
Manual measurements of emission characteristics (bandwidth, duration, S/N ratio) can be performed
with measurement cursors in the zoomable spectrum. The filter bandwidth is automatically adapted to
filter out all disturbing out-of-band emissions and noise.
Emission analysis
®
Emissions are analyzed using the time domain analysis part of the R&S
GX430. Zoomable level,
envelope, frequency, phase, and spectrum plots make it possible to measure technical parameters
such as level range, frequency shift, and symbol rate.
Demodulation & decoding
®
Demodulators and decoders can be set manually by the operator or automatically by the R&S
GX430
modulation and transmission system classifier.
®
Customer specific decoders (developed with R&S
installed on R&S
®
GX430 to extend the decoding capability.
Customer specific demodulators can be installed on R&S
GX400ID decoder development equipment) can be
®
GX430 to extend the demodulation
capability.
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R&S GX430 Characteristics
Figure 3: Demodulation & decoding of a Piccolo MK6 signal.
Figure 4: Decoding of Morse signal with Cyrillic or Arabic alphabet.
Automatic signal search and classification
®
The R&S
signals are automatically processed with the R&S
classifier. If connected to a Rohde & Schwarz receiver, the search process makes use of the highperformance frequency scan mode.
GX430 can define a frequency range for automatic signal search and classification. Detected
®
GX430 modulation and transmission system
Detection and classification results
The detection and classification results are displayed in a list together with all measured parameters
(e.g. center frequency, bandwidth, modulation type, shift, baud rate, code). Using this list, the operator
can select signals for reclassification or demodulation/decoding based on the measured signal
parameters. The list can be exported from the R&S
The chapter Operation
in this manual will provide you with detailed information on the usage.
®
GX430.
4071.5546.32-08.00 1-4
Preparations for Use R&S GX430
2 Preparations for Use
2.1 Software Installation
nsert the R&S GX430 Installation CD. If autorun is enabled on the CD drive, then the R&S GX430
I
Setup application will automatically be started. In the case that autorun is disabled or the R&S GX430
Setup application does not start, open the CD drive in Explorer® and double-click on
ApplicationStarter.exe to start the R&S GX430 Setup application.
Figure 5: R&S GX430 Setup application
From the R&S GX430 Setup application window you can start the R&S GX430 installation, open the
R&S GX430 Quick Start Guide and Manual, read the Release Notes for this version of R&S GX430 and
browse the provided additional documentation.
Simply click an entry with the left mouse button to activate the associated action. To start e.g. the R&S GX430 installation click the Start Installation entry.
After clicking Start Installation the R&S GX430 installation is started. Carefully read the information
presented on each page of the installation wizard that will guide you through the installation. Press Next
to proceed to the next page. You can use the Back button to go back to the previous page and change
the settings you made there. Use Cancel to exit the installation wizard without installing R&S GX430.
4071.5546.32-08.00 2-2
Preparations for Use R&S GX430
Figure 7: Installation Welcome screen
Click Next on the Welcome Screen to proceed to the Destination Folder selection.
Figure 8: Destination Folder selection
By default R&S GX430 is installed into the GX430 subfolder below the Rohde-Schwarz program group
of your <Program Files> folder. This is C:\Program Files\Rohde-Schwarz\GX430 on a typical system.
2-3 4071.5546.32-08.00
R&S GX430 Preparations for Use
You can change the destination folder by clicking the Browse button and selecting another folder in the
subsequent dialog. It is recommended, however, that you keep the default destination folder. R&S
X430 requires about 150 MB hard disk space.
G
Click the Next button to proceed to the Select Installation Type page.
Figure 9: Select Installation Type page
On the Select Installation Type page you can select the type of the installation. It is recommended that
you use the Typical setup. Click Next to start copying the files to the previously selected destination
folder. When the installation is successfully finished the Installation Result page will appear.
4071.5546.32-08.00 2-4
Preparations for Use R&S GX430
Figure 10: Installation result
Click Finish to exit the installer. Additionally to copying the required files, the installation will have
created an entry in the Start menu and a shortcut on the desktop.
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R&S GX430 Preparations for Use
2.2 License Management
The R&S GX430 product consists of a base package and several additional options:
Equipment
Type
Stock No. Designation of License/Option
GX430
Options
GX430RX
GX430MA
GX430SR
GX430SR-E
GX430DM
GX430DM-E
GX430DC
GX430DC-E
GX430MM
GX430SC
4071.5500.02 AMMOS PC based signal analysis & signal processing
4071.5700.02 Control for receivers (requires R&S receiver EM050, EM510,
EM550, ESMB, EB200)
Some functionality described in this manual is only enabled in R&S GX430 if the required license has
been purchased. In this case the corresponding chapter or section will be headed by the following
figure.
For unlocking any additionally purchased license in the software you will receive an executable to
perform the update to your locking mechanism (the Aladdin HASP SRM dongle). Simply double-click
the executable and press Apply update. Make sure the Aladdin dongle is connected to your system
and GX430 is not running. The changes in the licensing will be transferred to the dongle and will be
available at the next start of R&S GX430. You will always have to apply all the updates that have been
sent to you in the correct order of creation. Every update is bound to a specific Aladdin HASP SRM
hardware dongle. Updates can only be applied once.
4071.5817.02 GX430 ITU SM1600 modulation analysis
Table 1: GX430 options
The functionality “XXX” will only be available if the corresponding option
key has been acquired. Please check with your vendor for purchasing this
option if required.
Figure 11: Sample for documenting optional software functionality
4071.5546.32-08.00 2-6
Preparations for Use R&S GX430
2.3 Firewall
The R&S GX430 Subsystem needs for operation an IP address and a number of network ports.
Normally, the IP address is “local host” and the port range begins at 23376 (root port) and ends at
23411. In addition, the UDP port 23375 is used for broadcasting.
If you have installed a firewall on your computer, it may happen that the firewall blocks communication
on this IP address and the ports mentioned above.
Figure 12: Firewall problems
The following table shows the applications and ports of the GX430 subsystem. By using this information
you can parameterize your firewall with the exceptions to be made for proper operation of the
subsystem.
Executable Purpose IP address Port Protocol
rs_ComMan.exe General operationLocal host Root port TCP
rs_isd.exe Tuner data input Network adapter Root port + 10 UDP
rs_FlexLinkDriver.exe Data streams Local host Complete port range TCP
Table 2: Applications and ports of the GX430 subsystem
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Operation R&S GX430
3 Operation
3.1 Introduction
3.1.1 Starting the Application
The program first starts the processes making up the signal processing subsystem and establishes a
connection to it. Next, a connection to the Master/Slave server is established, provided that the GX430
application was configured to do that on startup (see the Settings
splash screen is shown on the display. After that the main window appears, whose components are
described in the next section.
The functionality “digital demodulation” will only be available if the
corresponding option key has been acquired. Please check with your
vendor for purchasing this option.
If you have no valid license for the functionality “digital demodulation” then the main window will be
displayed without the components related to demodulation of digital signals.
dialog for details). During this time, a
The functionality “decoding” will only be available if the corresponding
option key has been acquired. Please check with your vendor for
purchasing this option if required.
If you have no valid license for the functionality “decoding” then the main window will be displayed
without the decoding-related components. There is, however, an exception from this rule: The
Decoding tab, which is used for displaying system visualizations, will also appear if at least one of the
available demodulators provides data to be visualized in this tab.
The functionality “classification” will only be available if the
corresponding option key has been acquired. Please check with your
vendor for purchasing this option if required.
If you have no valid license for the functionality “classification” then the main window will be displayed
without the classification-related components.
The functionality “system recognition” will only be available if the
corresponding option key has been acquired. Please check with your
vendor for purchasing this option if required.
If you have no valid license for the functionality “system recognition” then the main window will be
displayed without the components related to system recognition (i.e., bitstream classification).
The functionality “tuner” will only be available if the corresponding
option key has been acquired. Please check with your vendor for
purchasing this option if required.
If you have no valid license for the functionality “tuner” then the main window will be displayed without
the tuner-related components.
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R&S GX430 Operation
The functionality “automatic search and classification” will only be
available if the corresponding option key has been acquired. Please
check with your vendor for purchasing this option if required.
If you have no valid license for the functionality “automatic search and classification” then the main
window will be displayed without the components related to automatic search and classification.
The functionality “manual modulation analysis” will only be available if
the corresponding option key has been acquired. Please check with your
vendor for purchasing this option if required.
If you have no valid license for the functionality “manual modulation analysis” then the main window will
be displayed without the components related to manual modulation analysis.
The functionality “GX430 ITU SM1600 modulation analysis” will only be
available if the corresponding option key has been acquired. Please
check with your vendor for purchasing this option if required.
If you have no valid license for the functionality “GX430 ITU SM1600 modulation analysis” then the
main window will be displayed without the components related to the R&S GX430IS application.
4071.5546.32-08.00 3-2
Operation R&S GX430
3.2 The Main Window
The R&S GX430 main window consists of the following components:
•the menu bar, with the menus File, Edit, View, Visualizations, and Help;
•the View toolbar, containing buttons designed for toggling the visibility of some parts of the main
window;
•the Visualizations toolbar, with a button that clears the visualizations and another one that
opens the folder containing visualization results;
•the File toolbar, used for selecting and processing an input source (a file, tuner, or audio
device), as well as for recording the data being processed;
•the Master/Slave toolbar, enabling you to send a job or the current tuner frequency and
bandwidth to another Master/Slave client;
•the Reporting toolbar, containing a button that creates a report file for the RAMON system and
another one that produces a screenshot of the GX430 application;
•the GX430IS toolbar, containing a button that passes the current input file to the R&S GX430IS
application;
•the dock window Digital Demodulation, used for selecting a demodulator and setting its
parameters, as well as for choosing one of the available decoders;
•the dock window Tuner, used for setting the parameters of the currently selected tuner (if any);
•the doc window Automatic Search and Classification, used for setting the parameters related
to the functionality automatic search and classification;
•the dock window Spectrum, used for setting parameters related to the visualization of FFT
processor spectrum data;
•the dock window Audio, used for setting the parameters of the analog demodulator;
•the dock window Classifier, used for setting classifier-related parameters;
•the Spectrum tab, used for visualization of FFT processor spectrum data;
•the Digital Demodulation tab, used for various visualizations of data streams;
•the Decoding tab, used for displaying system visualizations;
•the Classifier tab, used for displaying the results provided by the classifier;
•the Bitstream Classification tab, used for starting/stopping the bitstream classification and
displaying its results;
•the Automatic Search and Classification tab, used for visualization of data generated by the
automatic search and classification;
•the Time Analysis tab, used for manual modulation analysis;
•the Audio tab, used for visualization of audio data;
•the dock window Log Messages, displaying error, warning, and info messages as well as
subsystem faults;
•the status bar, displaying status information and status tips.
The visibility of the View, Visualizations, and File toolbars as well as of the dock windows Digital
Demodulation, Tuner, Automatic Search and Classification, Spectrum, Audio, Classifier, and Log
Messages can be toggled by using the View menu. The above-mentioned dock windows can also be
hidden and shown with the aid of the buttons contained in the View toolbar.
The dock windows for separate modules mostly offer the possibility to switch the corresponding module
on or off by checking or unchecking the corresponding check box in the dock window. Some modules
produce more processor load than others. To prevent the processor load from getting too high and thus
the processing from slowing down, it is advisable to always disable the processing in unneeded
modules. Read the paragraphs about job files in the next section to learn how you can easily switch
between different enabled/disabled configurations for all available modules.
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R&S GX430 Operation
3.2.1 The File Menu
The File menu consists of the following entries:
•Open File: This menu item brings up a standard file selection dialog, used to open a file for
processing by the signal subsystem. In the case of a WAV-file, another dialog window is
pened, for setting the file options shown below.
o
Figure 13: WAV File Options dialog
•Select Tuner: This menu item is only available in the presence of a valid license for Rohde &
Schwarz tuner support. It opens the tuner selection dialog, used to select one of the currently
configured tuners as input source. The tuners can be configured with the aid of the Settings
dialog.
Figure 14: Select Tuner dialog
•Select Audio Device: This menu item opens the audio device selection dialog, used to select
one of the available audio devices as input source and set its parameters.
4071.5546.32-08.00 3-4
Operation R&S GX430
Figure 15: Select Audio Device dialog
To get optimal results using an audio device, the following points should be paid attention to:
•Ensure that the audio device is not overdriven, otherwise you will get a comb spectrum
or flickering spectrum. Therefore the level of the audio output of the tuner and/or the
input level of the audio device should be adjusted.
•Ensure that no squelch is enabled at the audio output of the tuner or the squelch level
is set to minimum.
•Select the correct channel of the audio device. Normally, the tuner will output a mono
signal, so “mono” should be selected in the audio device selection dialog. The first or
second channel (left or right on the input plug) should be set. The setting “stereo” is for
complex audio signals, available only with accordingly equipped tuners. The correct
order (I/Q or Q/I) according to the input plug (left/right) should be set.
•Select the correct bandwidth for the audio output of the tuner and the correct
modulation type (normally CW or IF).
•To get the resulting audio output of the tuner in the middle of the resulting spectrum in
case of “mono”, the BFO must be a quarter of the sampling rate of the audio device.
•Common audio devices have a DC offset which results in a peak on the left side in
case of “mono” if the bandwidth is half of the sampling rate of the audio device or in the
middle in case of “stereo”. This is no malfunction of GX430.
•Export: This menu item displays a submenu, with the items Export as WAV-file… and Export
as AID-file…. The first submenu item is enabled if (and only if) the current input source is an IF-
file that is no WAV-file. Similarly, the second submenu item is enabled if (and only if) the current
input source is a WAV-file. Both submenu items bring up a standard file save dialog, used to
enter the name of the target file. The progress of the file conversion is displayed in a dialog like
the one shown below, which can also be used to cancel this operation.
Figure 16: File Export dialog
•Load Job: This menu item displays a submenu, with the items Entire Job… and Selected
Components…. Both submenu items bring up a standard file selection dialog, used to open a
3-5 4071.5546.32-08.00
R&S GX430 Operation
job file. In case of the Selected Components… item, after choosing the desired job file, a
further dialog box appears, for selecting the job components to be loaded.
Figure 17: Select Job Components dialog for loading a job
The Use relative path name for input file checkbox in this dialog appears in disabled state. It
specifies whether the name of the input file as contained in the job file is relative to the latter or
not. This might prove useful when exchanging jobs along with input files between workstations.
•Save Job: This menu item displays a submenu, with the items Entire Job… and Selected
Components…. Both submenu items bring up a standard file dialog, used to select the target
job file. In case of the Selected Components… item, after choosing the target job file, a further
dialog box appears, for selecting the job components to be saved in that file.
Figure 18: Select Job Components dialog for saving a job
The Use relative path name for input file checkbox in this dialog appears in enabled state if
(and only if) it is possible to save the name of the input file relative to the job file. Whether it
appears in checked or unchecked state depends on the value of the corresponding user setting
(see the Settings
dialog for details). The same setting determines whether the menu item Entire Job… should use a relative path name for the input file when possible (this is the default).
Relative input file names might prove useful when exchanging jobs along with input files
between workstations.
4071.5546.32-08.00 3-6
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