Usually transmission is at 45.45 baud (60 wpm) and 170 Hz shift for the two tones (21 Hz). Here follows a list of sub-bands used by radioamateurs transmitting in RTTY, as suggested by AA5AU on his wonderful page Getting Started on RTTY.
Then I plug the line-out of my receiver to the mic-in of my laptop to get the signal. The programme I use for decoding RTTY transmissions is MMTTY, up to know the only free software I found. Its transmission rate is quite low (something like 60 characters per minute), but it uses a solid modulation, meaning that the signal can be decoded also with high values of noise and interference. It can be considered as one of the first wireless digital transmissions, somehow a predecessor of wireless Internet. RTTY, that is, “Radioteletype”, is a way to transmit digital signals upon the radio.
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