Yes, there is....
Originally Posted by zboss
Is there a software
defined HF modem? I see no reason why the sound card in your PC wouldn't make a great SSB
After many years of development, there is WINMOR, which is used on the WINLINK network (ham radio), that does work....speeds/thru-put are fairly limited to about that of PACTOR
II (typically a bit slower)....typically about 1000 - 1200 baud....and, of course it also depends on your computer / sound-card....
Problem is the PACTOR
II, PACTOR III, and PACTOR IV protocols / coding are proprietary, and owned by the developers in Germany
, SCS...and they have not licensed them to anyone (at least none that I know of)....
So, while PACTOR IV is a wonderful system, and an outstanding technological achievement (giving thru-puts of 8kb, up to 10kb, in a narrow 2.4khz channel), and the fact that Sailmail adopted it instantly, etc....and this all makes it a fantastic choice for sailors....it is also a proprietary system...
So, there you go....a software defined modem capable of supporting slow-speed data and interfacing with windows software, and allowing some e-mail connectivity, DOES exist....but, ONLY for ham radio
(no business or commercial
use), and only with fairly limited speeds....
(and also, you need to remember the sometimes sporadic nature of ham radio
, signals, etc...)