Sigmira is a Software Defined Radio (SDR)
application program that
runs on Windows. 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"
A couple improvements have been made.
The presence of the FSK control window could be confusing
while in RTTY mode. RTTY mode is fixed at 170 shift, 45.45 baud.
The FSK control window is now hidden while in RTTY mode.
The signal database is supplied with the frequencies given
with the US convention radix point (a period).
This was annoying to our European friends and basically spoiled
one of the nicer features of Sigmira for them.
This new version automatically converts the radix point to
either period or comma according to the locale.
The new version installer (sigtools_1r12b_installer) is available
If you don't want to bother with uninstalling the previous
installing the new one you can just copy the new sigmira.exe to
(If you used the default installation settings that
would be c:/apps/sigtools_1r12/bin/sigmira.exe.)
The new sigmira.exe can be obtained here:
A new version of Sigmira is available.
The new version is version 1r8.
It is contained in the sigtools_1r12_installer.
The download link is above.
The main difference in the new version is that it automatically
detects when the features.dat file has expired and obtains
the latest version. You should never have to manually download
and install the features.dat file again.
In the new version the S4285 and FSK control windows
close when not in use.
There is less delay/latency in the audio.
The timeout on connection to SDR-Radio servers has been lengthened.
Note that I am no longer supporting the Linux version.
A link to the last Linux version remains above.
The features.dat file was updated.
If you have an older version of Sigmira (1r7b or before)
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.)
Sigmira_1r8b is included in Sigtools_1r12b.
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.