Just a quick and dirty project to get some students in the air.

RTTY code is taken from Pegasus Project, http://pegasushabproject.org.uk/wiki/doku.php/ideas:notes?s=rtty, which in turn was taken from The Icarus Project.
The Icarus Project - (c) Robert Harrison - rharrison@hgf.com December 2008, until I get my own sorted.
All code is:

 Copyright (C) Dave Hibberd 2011 <dave.hibberd@gmail.com>

 This is free software: you can redistribute it and/or modify it
 under the terms of the GNU General Public License
 as published by the Free Software Foundation; version 2.

 This program 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.

 You should have received a copy of the GNU General Public License
 along with this program; if not, see <http://www.gnu.org/licenses/>.