11.10.7 How Does The Ionosphere Allow Radio Signals To Travel Around The World?
One of the most remarkable properties of HF radio is its ability to communicate over thousands of kilometers without satellites. This FAQ explains the structure of the ionosphere, the D, E, F1 and F2 layers, ionization, critical frequency, maximum usable frequency (MUF), lowest usable frequency (LUF), skip distance, and long-distance sky-wave propagation.
- What Is the Ionosphere?
- Why Does the Sun Create the Ionosphere?
- What Are the Different Ionospheric Layers?
- Do Radio Waves Actually Bounce Off the Ionosphere?
- Why Doesn't Every Frequency Return to Earth?
- What Is the Lowest Usable Frequency?
- What Is Skip Distance?
- How Can Signals Travel Around the World?
- Why Does HF Communication Change So Much?
- Is the Ionosphere Still Important Today?
- How Do Engineers Predict Ionospheric Propagation?
- Why Is the Ionosphere One of Nature's Most Remarkable Communication Systems?
- What Should You Remember?