Simplified HF communications station using an adaptive processor

The 1980s has seen a resurgence in interest in the HF spectrum and its potential for reliable data communications. Considerable progress has been made in the use of real-time channel evaluation (RTCE), automated frequency management, and compact ionospheric prediction programs. The availability of powerful, reasonably priced computers and the widespread provision of remote control facilities on communications equipment in recent years has made possible the design of highly automated HF networks embodying RTCE and frequency management to give tangible benefits to the end user. The author describes the architecture of a message handling station designed as part of such a network. Consideration of the principal design constraints is followed by a description of the equipment, focussing on the HF adaptive processor at the heart of the station. The author finally lists some of the benefits reaped from the new architecture