Jan
At last someone who has not been brainwashed into using VisualStudio
and MS Windows only. By writing in C++ and using Qt4 you have formed
the framework for software that can be implemented on all the major
platforms - UNIX/Linux, Apple Mac & MS Windows. I'd be very interested
to try and compile your code on the first two platforms mentioned. My
major interest is in the HPSDR suite of hardware & software but I also
have an Elektor board. Is the code available for download? What
licence is it covered by?
Cheers
Chris
On 17 Sep 2009, at 20:08, j.vankatwjk wrote:
Hello
I did write a piece of software under Linux for use with the elektor
kit (may 2007). Being a programmer rather than a radio-man, I had
(and have) to learn a lot on signals and processing. Currently my
software works well, written in C++, using qt4 for the gui, using
hamlib for the rig interface and using portaudio for interfacing the
soundcard. The basic configuration handles analog modes (am, fm,
usb, lsb), rtty, psk, navtech, mfsk fairly well. An attempt to
decode cw is implemented, letting the user set relevant parameters,
it is working, however should be made more intelligent.
I am working to understand olivia and included the open source
implementation, but it needs quite some work before releasing.
The front end reads samples (standard 96K), the band filter is
selectable in terms of bandwidth, positioning in the positive half of
the field, as well as in terms of kind. Currently IIR filters as
butterworth etc are implemented, as well as FIR filters (with 255,
511 filterelements, so fairly sharp) and FFT convolution
implementations of the FIR filters. The inputrate can be selected.
The backend runs with a lower rate (also selectable), and does the
decoding.
The user interface has spectrum and waterfall displays (front end
for the whole 96K, backend depending on the selected decoding mode).
The implementation is straightforward and was a very nice
programming exercise (first program in about 8 years). It could
benefit from more
advanced techniques for handling and improving the signals at
various stages during processing and that is where I need input from
this group. Another field where I could use some input is in
descriptions for varieties of digital modes.
The elektor kit does work (not very sensitive though), I am thinking
on another board (but preferably cheap), but the main concern is
the software.
Obviously, the software is under the GPL available for interested
parties.
all the best, waiting for reactions
jan
