Release History
Decode and analyse signals, develop new decoders

go2DECODE

go2DECODE, offers signal demodulation, recognition, decoding, voice detection, technical signal analysis and advanced decoder development tools. Use this software, if you like to analyse protocols and demodulator's or if you have to implement new protocols into your go2MONITOR solution.

Release History

Release 17.1 (preleminary)

Version Highlights

  • PACTOR-4
  • Inmarsat Aero
  • VITA 49

New Release Numbers

All go2SIGNALS products use now the same version number scheme that takes the last 2 digits of the year the release started followed by the release number within that year.

Features and Improvements

  • Various bug fixes.

Decoder/APC

  • Demodulators
    • PACTOR-4
  • New decoders:
    • PACTOR-4
    • INMARSAT AeroPOCSAG: automatically switch to alphanumeric or numeric output format; this is important for senders that do not follow strictly the standard protocol. Added timestamp to output
    • DMR: significantly improved quality of voice output
    • Flex: added timestamp to output
  • Enhanced decoders:
    • dPMR: Short message decoding & status calls
    • DMR, NXDN: Short message decoding
    • DMR continuous: Voice in 2-slot mode
    • APCO-25: Short message decoding, faster detection
    • POCSAG: Handling of non-standard signals

Receivers

  • New receivers:
    • ThinkRF WSA5000-427
    • VITA 49 streaming
  • Enhanced receiver drivers:
    • IZT R3xxx: use of all 4 channels 
    • WiNRADiO G39DDC: use of 2 channels
    • R&S EM100/PR100 improved
Release 5.2, 15.Dec 2016

Version Highlights

  • Contestia
  • CIS FSK 200/500
  • Added C interface to plugin external modems developed by the customer
  • New demodulator for Chirp signals
  • FMW demodulator
  • GUI for receiver setup and configuration
  • Receiver NARDA NRA-6000 / IDA 2
  • Receiver IZT SignalSuite R4000

General

  • Added example files to demonstrate APC plugin mechanism for external modems

Decoder/APC

  • General
    • Added C interface to plugin external modems developed by the customer
    • Symbol stream of production modem can be optionally saved as REC file in production memory
  • Demodulators
    • New demodulator for Chirp signals
    • Added special mode to FSK2 matched demodulator for asynchronous Baudot signals
    • Significantly increased demodulation quality and frequency stability of (G)MSK demodulator
  • Decoders
    • POCSAG: automatically switch to alphanumeric or numeric output format; this is important for senders that do not follow strictly the standard protocol. Added timestamp to output
    • DMR: significantly improved quality of voice output
    • Flex: added timestamp to output
  • New Decoders:
    • Contestia
    • CIS FSK 200/500
  • New detector:
    • PACTOR4 improved

DDL

  • LibLoad command for external libraries improved
    • Search first in user folder and then in installation folder
    • Relative paths and subfolders within code folder are supported
  • New command BitCorrelation

DANA

  • FM demodulator output
  • New command line parameter noiffromwav

RCM

  • Graphical user interface to configure receivers (callable from Windows Start Menu and from within SDA
  • Support for receivers
    • Receiver NARDA NRA-6000, NRA-3000, NRA-2500, IDA 2
    • Receiver IZT SignalSuite R4000

SDA

  • All displays
    • Enable zoom in/out with Ctrl+mouse wheel
    • Added enry in context menu to save current display to clipboard
  • Analysis display
    • Added histogram view for magnitude, frequency and phase
    • Added horizontal scrollbar
  • Sonagram display
    • Allow moving search-range when already running modem recognition
  • Eye pattern displayed
    • Allow entering time difference for inverse cursor
  • Constellation display
    • Show timestamp (of last sample)
    • Added overlay mode: brightness depends on number of points
  • Symbol table editor: avoid input of invalid characters
  • Options menu
    • added button to start receiver configuration GUI
    • removed some obsolete parameters and regrouped some parameters
  • inidicate in Help->About if PMR and/or MIL version is installed

Bug Fixes

General

  • XML files in production memory for production results were corrupted in case of a modem withburst mode enabled
  • Only terminate the APC process that was started and not all APC processes that are running
  • Removed apcng component

APC

  • General
    • XML result: the fields <receiver_mode> and <modulation> within <production_start> had incorrect values
    • XML result: report correct center frequency within <production_start> for manual production mode
  • Automat
    • Avoid endless search loop for multimodems (Pactor multimodem)
  • Decoder
    • SI-FEC: avoid recognition in case of arbitrary idle sequences
    • PACTOR: avoid runtime error when decoder output time is limited
    • CIS-14: less false positive detection
    • PACTOR FEC: fixed usage of Huffman alphabet to get better output
    • CODAN 3212 1 channel PSK: avoid runtime error
  • DDL
    • Check for output buffer overflow reactivated

Decoder Editor

  • Context help did not open when command highlighted by double click

SDA

  • Loading previously saved .conf file did not restore all windows
  • Receiver control toolbar: gain value was only visible if drop-down box was opened
  • Hell display: avoid wipe out of display if parameters was changed in pause mode
  • Result display: last lines were sometimes not shown
  • Analysis display: fixed simultaneous zoom of phase and time
  • Bit display: do not clear view when changing mode between burst and circulation length

SOMO

  • If generator name of loaded file was identical to existing one then new parameters were not set
  • Removed symbol table V.29 for PSK8 generator
Release 5.1, 28.Jun 2016

General

  • GUI to control external receiver (frequency, bandwidth, attenuation) from within SDA
  • 64 bit version
  • Audio output enabled for light version
  • Added template modems for different universal detectors (bit sequence correlation, burst timing, bit autocorrelation) which can be parametrized via decoder parameters without any further DDL knowledge

Decoder/APC

  • XML result output is completely encoded as UTF-8; charset command from decoder to switch encoding is handled internally
  • Added information about burst start and end time from demodulator (only if burstmode is enabled) or decoder (if DDL command is sent) to production results
  • Modems
    • Added DSC-HF with shift of 500 Hz
    • Added Olivia 8/250 and Olivia 16/500
    • Corrected value for offset nominal frequency of several modems
  • New Decoder
    • Throb and ThrobX
    • MT63
    • Autocab
    • Voice A3E Air Traffic
    • Clansman
  • New detector for
    • Thales System 3000 Skymaster Selcall
    • Panther-H start sequence bursts
  • Pactor II: soft decision implemented to improve output quality
  • HFDL: support for PSK4

DDL

  • LibLoad command for external libraries improved
    • Search first in user folder and then in installation folder
    • Relative paths and subfolders within code folder are supported
  • New command BitCorrelation

DANA

  • Support for PROCITEC RAW file format removed
  • Added menu entry to reset settings to default values
  • Added button to prune complete play list

Decoder Editor

  • Option to convert text files to PROCITEC .rec format
  • Tab key inserts two spaces

Decoder Debugger

  • Support for MSB-first annotation in decoder editor
  • Breakpoints are not automatically deleted when decoder description is reloaded

RCM

  • Config file:  introduced active flag for easier editing
  • List of supported receivers and tips for configuration revised in manual

SOMO

  • Analogue generators: allow input of complex WAV files
  • Avoid “identical” fading for two different generators (different random seed)

SDA

  • Analysis and time display
    • Show absolute timestamp
    • Optionally switch between single dots and line display
  • Sonagram display
    • Modem recognition: show markers for frequency search range or nominal frequency; option can be enabled in context menu
    • Manual production: show markers for center frequency or nominal frequency and lower and upper frequency bound (FSK and multichannel/multitone modems); option can be enabled in context menu
    • Above frequency markers indicate absolute receiver frequency
    • Select frequency search range directly in sonagram display with the mouse (context menu)
    • Copy screenshot to clipboard (context menu)
  • Bit display
    • Default display mode changed to dark/white
    • Zoom in/out using Ctrl key and mouse wheel
  • Result display
    • Zoom in/out using Ctrl key and mouse wheel
  • Added menu entries to open Decoder Datasheets, List of Decoders and ReleaseNotes documents
  • Decoder parameters: option for tool tips
  • Default signal sources: added CMAS/go2MONITOR
  • Save and restore position and layout of toolbars
  • New modem list
    • Empty list (do not create one fake modem)
    • APC control parameters (search range or nominal frequency) are kept

Bug Fixes

General

  •  avoid conflict with RCM from CMAS/go2MONITOR

APC

  • Automaton
    • If modem was disabled because nominal frequency was outside of input signal range then reactivate it if frequency of input signal changes
    • Do not combine internally several voice detector modems into a single one
  • Decoder
    • PSK63-FEC: less false positive detection
    • PSK31-FEC: less false positive detection
    • dPMR: error correction improved
    • STANAG 4415: avoid recognition of STANAG 4539 signals
    • STANAG 4529: less false positive detection
    • STANAG 4481 FSK: less false positive detection
    • HFDL: output of all LPDUs
    • ALE-3G: output of '@' character was missing
    • Voice A3E: avoid detection if carrier is not within parametrized frequency search range
  • DDL
    • LibLoad command: unload external library if decoder is unloaded/replaced

DANA

  • WAV files: timestamp of recording was not properly restored from auxi Chunk (affected recordings from SpectraVue and NetSDR)
  • Playing from playlist with system time set: APC did not restart search if files had different receiver frequencies

RCM

  • Data loss and performance problems when using WinRadio receivers fixed

SOMO

  • Scrambler did not work anymore
  • avoid crash if two generator names were identical
  • avoid deadlock if generator name was void

SDA

  • Displays, in pause mode not reset when demodulator type is changed
  • Signal type “Primary demodulated AM/FM” was not always available
Release 4.2, 25.Jan 2016

General

  • Support for live multichannel digital-voice output (see PMR modem list for supported modems)
  • Light version: editing of modem parameters is possible
  • Sonagram context menu offers mouse measurement display: delivers X-, Y- and Z-values of the current mouse position in the sonagram in the corresponding cursor boxes
  • Tested under WINDOWS10

Decoder/APC

  • Production memory: support for RAW file format for IF files removed
  • New decoder for X6 Mazielka
  • New decoder for ERMES
  • New decoder for DSTAR (data and voice)
  • DMR
    • Add Trunked mode (Tier III)
      • Layer 3 PDUs (Data and Voice)
      • Base station activation and deactivation
      • Call setup, maintenance and tear-down
      • Destination addressing
      • built-in services
      • data call control
      • Announcement signaling
      • Trunk Station Control Channel (TSCC) outbound channel
    • Improved Tier I and II
      • Manufacturers Feature ID (MFID)
      • Layer 3 PDUs (Data and Voice)
      • Layer 3 information element coding
    • Error correction improved
    • Voice output quality improved
  • Pactor I:
    • Enabled output of binary file
    • Added option to stop modem after initial addressing
  • Packet 300
    • Output with ISO8859-15 Encoding
    • Hex output added (on channel 16)
    • Force output if CRC is incorrect
  • CIS 36-50
    • Synchronization improved
    • Output of sync and session key
    • Added modem files with shift of 200 and 500 Hz

DDL

  • New command to get version of the APC and the compiler
  • LibLoad command will not longer throw a runtime error if the library could not be loaded (instead it will return a handle with value 0)

DANA

  • Show visually that frequency marker cannot be moved
  • Removed spinbox „Predefined Frequencies“ and Output Spectrum
  • Support for parameter „AbsIFFrequency“ in .para file

Decoder Debugger

  • Support for MSB-first annotation in decoder editor

RCM

  • License check removed; can run standalone on a different computer

Bug Fixes

General

  • Support for non-Latin filenames and paths

APC

  • IF recording for unknown signals: last file was not closed if segmentation did not detect a signal
  • Less false positiv detection: FEC-A, PSK31, PSK31-FEC, LINK11 CLEW, DGPS, PSK63, QPSK31
  • PSK250: no output in case of idle sequences
  • Link-11 SLEW: channel bandwidth was too large which could cause erroneous measurement of center frequency
  • POCSAG: shift tolerance increased
  • DDL: CorrectRSext command: punctured symbols erroneously increased number of error reported

DANA

  • Adapt spectrum view, if sampling rate of sound card is changed
  • Limit the mixer frequency within the band pass filter

Decoder Debugger

  • Online-Debugger did not show upfront if activated

PMO

  • Fixed crash of tool Codec2Wav

SDA

  • Analysis view: no reset of the view when the filter bandwidth is adjusted
  • Plain files database: deleted modem could not be saved in database again
  • Sonagram view: position of sonagram <–> spectrum splitter was not restored on restart
  • GUI was not responsive if TCP connection to APC failed
  • Faster connection to APC
  • Result view: show correct error message if license for a decoder is missing
Release 4.1, 21.July 2015

General

  • Capability to use a license server, and share licenses on multiple computers.
  • SonagramViewer tool, a standalone application. It shows the spectrum/sonagram display for offline analysis of wav files (professional license needed). AF and IF WAV files can be loaded and the spectrum/sonagram of the complete file can be viewed offline. All the control and cursor functions of the usual display are available.

Decoder/APC

  • new AMBE codec
  • added automatic gain control (AGC) to the vocoder framework
  • XML result output with channel and modem bandwidth and signal parameters within production_start and submodem tags
  • Tetra: using vocoder framework
  • dPMR: direct production of audio output in WAV file format
  • NXDN: direct production of audio output in WAV file format
  • DMR: direct production of audio output in WAV file format and new decoder for continuous signals
  • BIIS: new decoder
  • BAUDOT: improved detection in case of idle sequences, support for Arabic Baghdad-70 and Baghdad-80, setting of the alphabet (latin, cyrillic, arabic, hebrew) in the modem description (decoder parameter).

GUI

  • Support to edit MultiModems
  • Analysis display: Reciprocal value (frequency) of time cursor distance is shown. So you have a direct readout of the symbol rate.
  • Analysis display: Magnitude can be shown either in linear or logarithmic (dB) scaling 
  • Support for a plain files database to store and retrieve modem and decoder files
  • Show modem description when loading modems from database
  • Proper support for different encodings (Cyrillic, Arabic alphabets etc.) in the result display
  • Settings are always saved automatically (option to deactivate automatic saving is removed)

DANA

  • Direct graphical change of the input band pass filter in the spectrum display
  • Context menu in play list to save the parameterized frequency
  • Set IQ or real (audio) input mode

SOMO

  • HF Channel Simulation (multipath fading and noise)
  • Specify the sample format when saving (PCM16 or FLOAT32, default is FLOAT32)
  • Selection of channel left/right removed

PMO

  • Export IQ WAV files as audio files
  • Inspect IQ WAV files with the new SonagramViewer tool
  • Convert codec files to WAV files

RCM

  • Support for SIR 5110 receiver
  • Support for WiNRADiO G33DDC receiver
  • Support for WiNRADiO G39DDC receiver
Release 3.7, 12.Feb 2015

General

  • Decoders are split up into 3 packages (required because of export law):
    • Standard (always part of go2MONITOR
    • PMR Option
    • MIL Option

Decoder/APC

  • Support for external vocoders (Soft- or hardware)
  • APCO-25 software vocoder implemented 
  • STANAG 4539 HDR, soft decision/equalizer implemented which tremendous improves the decoding quality
  • Use of preamble symbols for burst detection in HFDL, STANAG 4539 HDR, STANAG 5511 SLEW
  • PACTOR 4 detector for speed modes 2 to 10
  • Improved nominal frequency USB voice detection (not activated in default configuration)

GUI

  • Multichannel PSK demodulator: Additional parameter for channel delay (Phase delay). Used in CHN 4+4 decoder.
  • Additional short comment for each decoder.

DANA

  • Playlist: Multi-selection supported
  • Command line: Directory support (all files of the directory are added for playback)
  • New checkbox to support "reel" (i.e. not IQ) signals, before only possible using a hidden function

SOMO

  • Possibility to mute/unmute all generators
  • New default levels for signals and noise
Release 3.6, 12.Jun 2014

SDA (GUI):

  • Allow parameterization of the decoder during runtime: The settings are stored in the modem file and GUI elements are dynamically created when the modem file is loaded
  • Allow symbol recording in modem recognition state: The recording begins at production start and ends at production end
  • New display: Autocorrelation (cross-correlation of signal with itself, e.g. to identify repetition patterns)
  • Restore last operation state (modem recognition, production, classification) on restart (only if settings are saved)
  • Displays: Red border frame around the sonagram window when paused
  • All display types have a context menu
  • Modem files VHF: provide both variants for primary and baseband demodulation
  • Added documentation for parameterization of OFDM demodulator

APC:

  • Support for 64 bit platforms
  • New config key “MixCenterToBaseBand”: This parameter sets the center frequency based on the parameterized modem list and frequency search range. The input signal at the center frequency is shifted to the base band which can reduce CPU usage.
  • New config key “MaximumOnlineDelay”: This parameter specifies the maximum delay in seconds the signal processing unit stays behind the online signal source
  • Added several new fields to XML result output (consult ICD document for details)
  • All PSK demodulators provide soft symbols in addition to hard symbols
  • Allow parameterization of decoder during runtime: settings are loaded from modem file
  • STANAG-4481-FSK, STANAG-4481-PSK, STANAG-4415, STANAG-4539: added some more modes
  • CODAN Chirp: minor improvement of demodulation quality
  • Tetra: support for SDS text messages
  • HFDL: soft decision implemented
  • ALE-2G: moved from premium to standard HF decoder list
  • new decoder for Tetra DMO
  • new decoder for CV-786
  • new decoder for CHN 4+4: production (was detector only)
  • new decoder for ALE-400
  • new decoder for ALE-3G (STANAG 4538): production for BW0,1,2,4,5,6; only detection for BW3

DANA:

  • The frequency marker in the spectrum view can be moved with the mouse
  • If a file cannot be loaded (not found, wrong format etc.) in the play list, then remove file from play list is available

Decoder Debugger:

  • Decoder can be parameterized at runtime with decoder parameters from modem file
  • DDL command CorrectRSext() fixed for case where code length is less than 2^(symbol length -1)

PMO:

  • Binary files, additional column to show modification time
  • Sorting of files based on timestamp
  • Show start time, end time and duration

SOMO:

  • red border frame around the sonagram window when paused
Release 3.5, 16.Nov.2013

Important:

  • Updated to Automatic Production Channel (APC) Release 3.2.0
  • This release requires a new maw license file!
  • New: TETRA saves output in 4 separate WAV files (before all 4 channels in one file)

New modems:

  • apco-25
  • gw_ofdm
  • NXDN
  • Renamed, modified or changed modems:
  • arq_e3_100bd_400hz
  • arq_e3_50bd_400hz
  • arq_e_cyc8_96bd_192hz
  • arq_m2_342_200bd_410hz
  • atis
  • baudot_2stopbit_75bd_500hz
  • baudot_async_50bd_170hz
  • baudot_universal_50bd_650hz
  • cis-12_psk2
  • codan3212_16channel_psk
  • dmr
  • dpmr
  • dtmf
  • dtmf_fm
  • flex
  • flex_1600bd_psk2a
  • md674
  • mobitex-1200
  • mobitex-8000
  • packet-1200
  • packet-1200_sub
  • packet-300
  • packet-9600
  • pactor
  • sitor-b_100bd_170hz
  • voice_a3e
  • voice_a3e_j3e
  • Voice_F3E_DTMF
  • voice_j3e_selcal_icao

Removed modems:

  • arq_e3_cyc8_50bd_400hz
  • codan3012_16channel_psk
  • flex_1600bd
  • md647 to PREMIUM DECODER
  • packet-300-4800
  • packet9600
  • voice_selcal_icao
  • New Modem Lists, “HF_on_air” and “VHF-UHF_on_air” containing only frequently used modems
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