Learning Objectives

• You will use information about the sun and ionosphere to predict how and why HF transmissions vary with time of day, latitude and season.
• You will predict how local atmospheric conditions can bend electromagnetic transmissions and how this influences VHF, UHF and SHF radar target detection, electronic surveillance measures, jamming and radio communications.
• You will understand how changes in wind speed, temperature and humidity near the surface control the evaporation duct which results in greatly extended ranges for higher frequency radio and radar transmissions.

Modules

The table below provides a roadmap to the learning materials. We recommend that you start at the beginning and go through the topics in order. However, each topic has a link so that you can revisit the material as needed.