15th Edition
Data communications
With the advent of the personal computer (PC), the whole amateur data communications field has grown to encompass a lot more than exchanging hand typed messages. What has made this possible is the rapid growth in what are usually referred to as soundcard modes. The computer's audio ports are interfaced to the radio so that the PC generates audio that is subsequently upconverted to RF, usually using the radio in SSB mode. On receive, audio is fed into the PC and after digitisation of the analogue waveform, the power of Digital Signal Processing is used to do all of the signal processing. Transmit/receive switching is also usually placed under computer control with another interface line, allowing data mode operation to take place without having to make regular changes on the radio.
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