From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jonathan Naylor Subject: JT44 on Linux progress Date: Tue, 3 Sep 2002 20:58:48 +0200 Sender: linux-hams-owner@vger.kernel.org Message-ID: <02090320584801.25808@g4klx> Reply-To: g4klx@qsl.net Mime-Version: 1.0 Content-Transfer-Encoding: 7BIT Return-path: List-Id: Content-Type: text/plain; charset="us-ascii" To: moon-net@nlsa.com, linux-hams@vger.kernel.org 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