From: Jonathan Naylor (yrr.ajbeijhdr@mail.dy.fi)
Date: Tue Sep 03 2002 - 21:58:48 EEST
Hi all
I thought I'd give an update on my JT44 for Linux, for those who are
interested.
As reported some time ago, the transmit side is working fine. That was
the easy bit.
I've spent a little time working on both FSK441 and JT44 reception,
learning a lot along the way. FSK441 is not so good at the moment, but
having turned my attention to JT44 and learned a few tricks I feel that
FSK441 can move along quite quickly once I start again on it. FSK441
reception does work, its just nowhere near as good as the original
program.
The JT44 receive program was started this morning after a chat with
Tomi Manninen OH2BNS who game me a condensed DSP tutotial via the
converse system, thanks Tomi, your words were invaluable. I have JT44
decoding working at the moment, and on the test files available from
W3SZ's web site, my JT44 receive is approximately 3dB worse than real
WSJT. At present it is a non real-time program whereas real WSJT is
almost real-time if signals are strong enough.
I could go into details about what I did, but I'd probably rather do
that in private e-mail. The program is open source and is covered by
the GPL. Anyone who wants a copy of the source is welcome to ask.
I did spend some time working on a GUI using KDE/Qt but gave up in
disgust, it sucks horribly and the documentation is crap. GTK is far
better in every respect except it isn't C++. I have found something
called WxWindows which has C++ bindings and which will allow me to
compile my program for Windows in due course, all I need to do is
change the sound card code.
See you at Weinheim ?
Jonathan HB9DRD/G4KLX
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