Soundmodem on modern Operating Systems

Five years ago I presented drivers for using standard PC’s with soundcards as packet radio modems [ 131. The mainstream CPUs of that era were not quite powerful enough for complex signal processing, so the design at that time had to trade robustness for computational simplicity. Futhermore, operating system preferences have changed since. It is therefore time to rethink the design. In this article, an up to date implementation of an amateur soundcard packet radio driver is presented that features a common source base supporting all major operating systems, and the most common modulation formats.