HF system design

This lecture is intended to complement the companion lecture dealing with the propagation aspects of HF communications. The major topics covered are as follows: (1) the design of point-to-point systems; (2) the design of systems involving mobile terminals; (3) system control and frequency management; and (4) resistance to interception and disruption. The lecture attempts to show how the propagation effects discussed in the previous lecture on HF groundwave and skywave propagation are taken into account in the design of HF communications systems for various purposes.