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
Display up to 2 MHz width with the RTL-SDR.
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.
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.
Sigmira has been combined with XDFilt in the "sigtools"
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
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:
SDR-IQ is a trademark of RFSpace, Inc.
SDR-14 is a trademark of RFSpace, Inc.
Sigmira is a trademark of Steven A. Harlow.