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2. Sound Card Modes

This section describes the sound card modes.

2.1. fldigi

fldigi is one of the most robust soundcard modem software around. It supports CW, DominioEX, Feld-Hell, MFSK, MT-63 PSK, OLIVIA, RTTY, Thor, and Throb. fldigi also includes, as part of the software, a logger which is smart enough to almost complete itself.
fldigi receiving PSK-31

Figure 1. fldigi