Table of Contents

High-Frequency Communication System Engineering: Wireless. High-Frequency Radio in the Global Information Infrastructure. High-Frequency Systems Engineering. High-Frequency Systems engineering. High-Frequency System Design. High-Frequency Sky-Wave Channels: Sky-Wave Propagation in a Benign Ionosphere. Sky-Wave Propagation in a Disturbed Ionosphere. Noise. Radio Interference. High-Frequency Antennas: Narrowband Antennas. Broadband Antennas. 'Small' High-Frequency Antennas. Environmental Effects. Digital Modems for High-Frequency Radio: Traditional Design Approaches. Relative Merits of Contemporary Designs. Enhanced High-Frequency Modem Design. Automatic Link Establishment Signal Structure: Linking Performance. ALE Word Format. Coding. Word Synchronization. Addresses. ALE Frame Structure. Automatic Link Establishment Protocols: Overview of ALE Operations. Channel Evaluation and Selection. Link Establishment. ALE Data Structures. ALE Orderwire Functions. Future Developments. Linking Protection: Linking Protection Technique. Protection Interval Analysis. Performance Evaluation of Linking Protection. The High-Frequency Data Link Protocol: Data Transfer Protocol. Message Management Protocol. Link Management Protocol. Timeouts. Broadcast Mode. ARQ Circuit Mode. Full-Duplex Operation. Adapting Data Rate. High-Frequency Radio Networking: Automated Networking Technologies. An Example Implementation. Automated High-Frequency Network Management.