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The good old shortwave radio set has been perfected in several ways. Information data rates of a few uncertain tens of bits per second were increased to more than 3000 errorfree bit/s by sophisticated modem techniques and error correction. Intelligent algorithms were created to adapt transmission parameters to channel quality or initiate a change to a better channel. System-oriented considerations turned a unit for transmitting Morse into a LAN/WAN-compatible communications system permitting all kinds of data to be exchanged. FIG 1 shows a modern workstation based on Rohde & Schwarz’s HF Transceiver XK2000.
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