For those of you looking for a relatively simple and inexpensive method of
doing 45 and 75 baud RTTY using logical keying ("FSK") you can have a look at a
TX-only modem that I built that will accomplish this. It might be a nice
project for those of you who are set up for logical keying but don't like the
EXTFSK jitter, have wandering stop bits with your UARTs, or don't want to deal
with MMTTY between your logging software and radio for whatever reason. It's
an afternoon project, if that.
The website explains the details, including how to integrate it with N1MM.
http://www.frontiernet.net/~aflowers/tinyfsk/
Enjoy!
Andy K0SM/2
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