The DAB-RPI and sdr-j-dab programs are further developed. It is now
possible to show additional data such as station labels.
The WFM-RPI programs for FM reception are further developed and attention was paid to rds decoding for mono transmissions.
The DAB software under Windows supports - in a limited way - devices using the "extIO-XXX.dll" (note that DAB needs 2048000 samples/second, so do not try soundcard based devices). It was tested with the extIO dll's for the SDRplay, the extIO dll for the DABsticks and the most recent extIO dll for the AIRspy, using the 1.07 library (due to an interface mismatch, the extIO-AirSpy.dll, using library version 1.06 the software will not run).
The OS running on my Raspberry PI 2 is Arch Linux. The DAB-RPI software
was also successfully tested on Raspbian Jessie, it compiled and ran.
However, it seems that under Arch the software performs
The DAB-RPI software does not use Qwt, which allows a painless
compilation using either Qt5 or Qt4.
The sources of the DAB-RPI contain a subdirectory with sources for the aforementioned "soundClient" (the client is available as an executable in the Windows distribution.)
Although the DAB-RPI software is functionally equivalent to the sdr-j-dab software, there are some differences in the implementation. It is optimized to use the 4 computing cores and has - as stated earlier - a smaller GUI. It does support DABsticks, SDRplay and Airspy with built-in support functions (you obviously need to install the proper libraries though). Be aware that - at the time of writing - the SDRplay library for use on the RPI is older than the library for Linux and Windows, this might require adapting a setting in the configuration file. See README.SDRPLAY in the sourcetree.
The precompiled set of Windows programs contains an executable derived from the DAB-RPI sources and is configured for use with SDRplay, AIRSPY, DABSticks and the extIO option. The Linux version can be configured - by commenting or uncommenting lines in a configuration file - for SDRplay, AIRspy, DABsticks, and UHD Ettus research (the last one not tested by me).
The software for FM was modified and is continued as a set of "small" fm programs, one for each kind of input device. There is support for DABstick, for SDRplay and for the AIRspy, for each of these devices an instance of the WFM software is made and for each of these devices an executable is available in the Windows distribution. The Windows version furthermore supports - in a limited way - extIO-XXX.dll's. The software was rewritten to make use of the cores of the RPI 2 processor and both the DABstick and the SDRplay are easy to use as device. It must be noted though that since the AIRspy delivers its samples at a rate of 2500000, non-integer decimation has to be applied and the Raspberry PI 2, when asked to run the software with the AIRspy, will be loaded until (or just over) its limits. The software can be used however on a regular PC as well, both under Linux or under Windows.
A new feature is that the software supports a program list, which can be set and altered. Such a program list may contain some of the preferred program names with their associated frequency and is maintained between program invocations.
Also new is that - as with the DAB-RPI - the WFM-RPI software - when configured to do so - sends its output to port 20040 - for remote listening (again, my device is not in the same room where I normally stay).
The software runs on the Raspberry PI 2, and on regular PC's under Linux and Windows. Again, it was extensively tested on a Raspberry PI 2 running Arch Linux, and it was tested to show that compilation on and for Jessie on an RPI 2 did not give problems. However - again -, experiences seem to show that the software under Arch outperforms the software under Jessie in this respect, under Jessie there might be some stuttering in the sound.
The 7.1 version of the smallband sw-receiver
underwent - again - a major restructuring.
For use of the software under Windows, handling of Winrad compatible dll's is still limited to those devices with an extIO dll that provides data using a regular soundcard.
Direct support for the Elektor card and for the pmSDR under Windows disappeared, since using the extIO-XXX dl for these devices is an excellent alternative.
The SDRplay and DABsticks are supported directly, both for Linux and Windows, the Elad-s1 is supported under Linux. Under Linux the direct support for the Elektor card and the pmSDR is still available.
The source tree of the sw receiver contains components to setup a (very simple) SDRplay mini-server for use with a "remote" handler in the sw-receiver. The mini server runs on any Linux system (I have it running on the Raspberry PI 2 and an old laptop with Ubuntu 14.04), and allows me to listen to SW and experiment with decoders while sitting in the "lazy chair".
As before, for configuration purposes (the ".ini" file has to be told where to find the plugins for the input handling and for the decoders), a small configuration utility is included. This utility will set the paths for the different plugins in the ".ini" file. (When starting the program from within the "windows-bin-sw" directory (for Windows) the plugins will be found directly.)
New is an experimental DRM decoder, a decoder for DRM transmissions (currently audio only). Its "version number" (0.1) shows that it is in an early stage of development. The figure below shows the reception of a british DRM program using a pmSDR device through an extIO-PMSDR.dll and an EMU 202 external soundcard under Windows.
The sw-receiver is cross-compiled for 32 bits and runs in 32 bits and
64 bits Windows and under Linux.
While Windows users can use the DRM decoder directly, Linux users have to do some extra work in creating an adapted faad library to get the decoder running (but of course, the software can be installed without DRM decoder).
The spectrumwidth can be selected - depending on the selected device -
within the small control window for the selected device.
Automatic stepping through a user-defined range of frequencies,
with a user-defined speed and stepsize is also possible.
The spectrum width for DABsticks is limited to 3 MHz, Airspy provides you with either 2.5 or 10 Mhz wide spectra.
The manuals can be downloaded here, dab receiver (a manual dedicated to the DAB-RPI is still "under construction"), wfm software, and one for the sw-receiver.
An informal description of the synchronization in the DRM decoder is given in this description, the document is still a draft.
The executables for Windows are packed as always in a
"zip" file. There are two files, one is
a zipped folder for
the DAB program, the WFM program and the spectrumviewer,
together some dll's. The folder contains the executable for the FM software
"old style" as well.
The other one is for
the sw-receiver together with the
plugins for input and decoders.
Note that while the windows-bin-xxx folders are updated once every few (three, four) months, sometimes newer versions of some of the executables may be found on the github site (see below)
Sources for the programs are maintained at github, this site will also
contain the most recent releases, sometimes including executables for
The github address is https://github.com/JvanKatwijk/XXX
where XXX is any of
To make life easy, an image of the Debian Jessie distro with both the DAB-RPI and WFM-RPI software installed, is available on request.
The software is developed as hobby project and is available under a GPL,
and as the license state:
SDR-J is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
I am grateful to SDRplay ltd for providing me the possibility to
use the SDRplay and to Benjamin Vernoux for providing me
the possibility to use the AIRSPY, both wonderful devices.
Suggestions and contributions (material and immaterial) are welcome.
Pijnacker, February 2016
Jan van Katwijk
Lazy Chair Computing