Rein Couperus <pa0r@eudxf.org>
Thomas Beierlein <tb@forth-ev.de>

contributions by: 
Joop Stakenborg (PG4I), 
Dimiter Kroumov (LZ3NY),
Martin OK1RR
Andy G4KNO
Fred DH5FS
Nate N0NB
Mario DH5YM
Ervin HA2OS

and others

