3.11.3 What Is The Difference Between Analog And Digital Modulation?

Explore how analog and digital modulation differ. Learn how analog systems continuously vary a carrier, while digital systems represent information using discrete symbols, providing greater efficiency and improved resistance to noise.

3.11.4 What Is Amplitude Modulation (AM) And How Does It Work?

Learn how amplitude modulation varies the strength of a carrier to convey information. Explore sidebands, modulation depth, power efficiency, and why AM remains important in aviation and broadcasting despite its age.

3.11.5 Why Is Single-Sideband (SSB) Used For HF Radio?

Understand why HF radio systems almost universally use single-sideband modulation. Learn how suppressing the carrier and one sideband dramatically improves both bandwidth and power efficiency while preserving the transmitted information.

3.11.6 Why Does Frequency Modulation (FM) Reject Noise Better Than AM?

Explore why FM provides much better audio quality than AM. Learn how frequency modulation rejects amplitude noise, the capture effect, pre-emphasis, de-emphasis, and the trade-off between noise performance and bandwidth.

3.11.7 What Determines The Bandwidth Of A Modulated Signal?

Learn why every modulation scheme occupies bandwidth and what determines how much spectrum it requires. Explore sidebands, Carson's Rule, symbol rate, roll-off, and the relationship between bandwidth and data rate.