Home   Sigmira 1r10  

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, SDRplay RSP, 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_1r14_installer

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

A new version of Sigmira is available. It supports the SDRplay RSP.

The new version is version 1r10. It is contained in the sigtools_1r14_installer. The download link is above.

New version supports SDRplay RSP. Sigmira's maximum spectrum display width is still 2 MHz for now.

The Mirics chipset ADCs in the SDRplay RSP have more offset and noise around DC. For that reason I recommend that Sigmira typically be run with the "DC Comp" feature turned on. You may need to switch it off when AM modulation is selected and you are tuned right on the carrier. (One way to avoid the ADC offset is to tune to the side of the signal, click "Lock Center", and then tune to the signal.)

In the AM broadcast band I typically run with the gain at about one quarter on the RF Gain control scale. In quieter areas of the spectrum I run with the RF gain set at about the midpoint. If the gain is too high there will be intermodulation of the signals and more artifacts. If you see that back the gain down. Also, if the plot in the Phase Plane display appears to have a clipped, square outer boundary then reduce the RF gain.

Sigmira_1r10™ is included in Sigtools_1r14. 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

Sigmira™ is a trademark of Steven A. Harlow.

Copyright 2016, Steven A. Harlow