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Sigmira™ is a Software Defined Radio (SDR) application program that runs on Windows and Linux. It operates with with an external conventional receiver, RFSpace SDR-IQ™, RPSpace SDR-14™, or SDR-RADIO.com networked receiver. Sigmira offers wideband spectrographic, waterfall, and phase plane displays. It also demodulates various military, utility, and "ham" radio signals.

Sigmira's features include:

  • "Waterfall" and spectrograph displays of up to 200 kHz width with the SDR-IQ™/SDR-14™.
  • Demodulation of HFDL, PSK31, FSK, SITOR-B, CW, and NFM modes.
  • Demodulation of NATO STANAG 4285.
  • Demodulation of the "Japanese Navy Slot Machine"
  • Point and click signal selection/tuning.
  • Signal Database with automated tuning and logging.
  • Phase plane display.
  • Playback of saved .wav files.
  • 16 bit sampling. Typical sampling rate: 48 ksps.
  • Signal strength meter.
  • Adjustable squelch.
  • Clock display with UTC and local time.

The distribution package includes examples of HFDL, PSK31, RTTY, FSK, SITOR-B, CW, NFM, JSM, and STANAG 4285 signals in .wav files.

A database of over a thousand signals is also included in the distribution package.

And it's free.

The manual:   sigmira_manual

Download Windows version:   sigtools_1r11b_installer
features.dat

The Linux version:   sigmira_1t7.zip

Sigmira has been combined with XDFilt in the "sigtools" installer.

2014/9/25
The features.dat file has expired. Whether you have an existing installation or are doing a new installation you need to replace the 'features.dat' file. The replacement can be obtained here: features.dat   Place it at <sigmira_install_root>/bin/features.dat. (If you used the default settings on your original install then <sigmira_install_root> is c:\apps\sigtools_1r11b.)

2011/7/25
Check out Nils Schiffhauer's work. Here he presents examples of STANAG 4285 signals: STANAG 4285
Here he compares the decoding of STANAG 4285 by Sigmira and MultiPSK: Sigmira Comparison
Here is his signals website: Nils Schiffhauer

2011/7/25
The md5sum for the installer, sigtools_1r11b_installer.exe, is 5ab5aec2399101370240bc8c2980eaa9.
2011/5/21
Added support of SDR-RADIO.com networked receivers to the windows version of Sigmira.
Be sure to also visit SDR-RADIO.com

2011/5/15
The new Linux version (1t7) now features connection to SDR-RADIO served networked receivers. (Thanks go to Simon for his support.)
Download the .zip, unzip it, and read the README.
Be sure to also visit SDR-RADIO.com

2011/1/12
Linux version now available. (Developed on Ubuntu 9.04.)

2010/12/18
Added HFDL demodulation.
HFDL is used by intercontinental airliners. It is used on HF because HF signals propagate over the horizon and over oceans. HFDL messages oftain contain information such as aircraft ID, position (latitude and longitude), equipment status, and weather.


Sigmira_1r7™ is included in Sigtools_1r11. The new version can be installed without removing the older one. The desktop shortcuts will point to the last one installed.
If you remove the older version and have edited or customized your signal database be sure to make a backup copy of your "sigmira.sdb" file before removing the old version.

Note that the minimum tested configuration is with a 2 GHz Pentium 4 with 480 MB of RAM running Windows XP SP2. CPU usage is 10% in USB mode and 50% in S4285 mode.



To report bugs please send email to the address given on the 'contact' page: http://www.saharlow.com/contact

SDR-IQ™ is a trademark of RFSpace, Inc.
SDR-14™ is a trademark of RFSpace, Inc.
Sigmira™ is a trademark of Steven A. Harlow.



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Copyright 2014, Steven A. Harlow
DSP SDR-IQ SDR-14 STANAG 4285