Learning Objectives

In this module you will learn how the lower frequency radio spectrum is affected by the environment. Particular emphasis is on HF transmissions and how knowledge about the sun and ionosphere will help you predict how and why HF transmissions vary with time of day, latitude, season and space weather.

Module Topics

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• 2.1 Introduction to HF and Lower Frequencies
• 2.2 The Ionosphere and Sun

• 2.3 Choosing the Right Frequency; HF Models

• 2.4 Space Weather