Sigmira is a Software Defined Radio (SDR)
application program that
runs on Windows and Linux. It operates with
with an external conventional receiver,
or SDR-RADIO.com networked
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
Demodulation of HFDL, PSK31,
CW, and NFM modes.
Demodulation of NATO
Demodulation of the
"Japanese Navy Slot Machine"
Point and click signal selection/tuning.
with automated tuning and logging.
Phase plane display.
Playback of saved .wav files.
16 bit sampling. Typical sampling rate: 48 ksps.
Signal strength meter.
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.
Sigmira has been combined with XDFilt in the "sigtools"
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:
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.)
Check out Nils Schiffhauer's work. Here he presents examples
of STANAG 4285 signals:
Here he compares the decoding of STANAG 4285 by Sigmira and MultiPSK:
Here is his signals website:
The md5sum for the installer, sigtools_1r11b_installer.exe,
Added support of SDR-RADIO.com networked receivers to the windows
version of Sigmira.
Be sure to also visit
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
Linux version now available. (Developed on Ubuntu 9.04.)
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
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:
SDR-IQ is a trademark of RFSpace, Inc.
SDR-14 is a trademark of RFSpace, Inc.
Sigmira is a trademark of Steven A. Harlow.