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Sigmira™ is a Software Defined Radio (SDR) application program that runs on Windows. It operates with with an external conventional receiver, RFSpace SDR-IQ™, RFSpace SDR-14™, RTL-SDR, 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™. Display up to 2 MHz width with the RTL-SDR.
  • 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.
  • RF gain control.
  • 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 two thousand signals is also included in the distribution package.

And it's free.

The manual:   sigmira_manual

Download Windows version:   sigtools_1r13_installer

The Linux version (unsupported):   sigmira_1t7.zip

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

A new version of Sigmira is available. It supports the RTL-SDR dongles.

The new version is version 1r9. It is contained in the sigtools_1r13_installer. The download link is above. No updating of the features.dat file is required. Sigmira will do that automatically when required. An RF gain control has also been added.

The signal database is supplied with the frequencies given with the US convention radix point (a period). Sigmira will automatically convert the radix point to either period or comma as appropriated according to the locale.

Note that the Linux version is no longer supported. A link to the last Linux version remains above.

Sigmira_1r9™ is included in Sigtools_1r13. 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.

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.

Copyright 2015, Steven A. Harlow