Sigmira™ is a Software Defined Radio (SDR) application program that runs on Windows. Sigmira offers real-time wideband spectrographic, waterfall, and phase plane displays. It also demodulates various military, utility, commercial, and "ham" radio signals. It can accept signal input via sound card and "virtual audio cables". Sigmira can also directly connect to various SDR devices.

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, NFM, and FLEX pager modes.
• Demodulation of NATO STANAG 4285.
• Direct operation with RFSpace SDR-IQ™, RFSpace SDR-14™, RTL-SDR, SDRplay, and RemoteSDR networked receivers.
• Point and click signal selection and tuning.
• Signal Database with automated tuning and logging.
• Phase plane display.
• Playback of saved .wav files.

You don't have to own SDR hardware to use Sigmira. You can connect to networked receivers or you can play the included example signal files.

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

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

And it's free.

2024/1/7

If the Signal Database isn't showing up for you delete (or rename) your features.dat file and restart Sigmira. Sigmira will fetch the latest correct features.dat.


2021/8/22

A new version of Sigmira™ available. Version 1r13 (in Sigtools 1r17).

New features include:

• FLEX pager demodulation.
• More obvious WaveIn (sound card) controls.
• I/Q WaveIn.
• NFM mode is improved with better input and output filtering and better de-emphasis.
• The "Eye Diagram" now also gives a basic display of the demodulated signal while in AM, USB, LSB, and NFM modes.
• More diagnostics for the SDRplay API.

Support for SDRplay RSP2, RSP1A, RSPduo, and RSPdx is still limited to the first tuner and the first antenna. That is the way it is likely to remain. Sigmira works with SDRplay API versions 3.06 and 3.07.