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The sophistication of Rohde & Schwarz’s ALIS processor for automatic link setup and shortwave-link adaptability is the result of technical advances and continuous experimentation and trials [1]. By variation of the system parameters frame length, redundancy, type of modulation and frequency, the HF transceivers of the XK2000 family (FIG 1)[2] show high capability in adapting to time-variant channel quality and can achieve data rates up to 3.6 kbit/ using Modem GM2100 (max. 5.4 kbit/ and the RSX.25 protocol.
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