🔍 Key Concepts

• Frequency Modulation (FM) vs Amplitude Modulation (AM) – what is actually changing in each type? • What are sidebands and which types of modulation (AM/SSB) primarily deal with changing sidebands and carrier amplitude? • How does information (voice/data) get "carried" on a radio signal in FM compared to AM/SSB?

💭 Think About

• First, recall the basic definition of FM: which part of the radio wave carries the changes that represent the audio signal? • Look at each choice and ask: is this describing FM, AM, or SSB behavior? Eliminate any that clearly describe AM or sideband behavior, not pure FM. • Pay attention to any option that mixes concepts from FM and SSB/AM together. Is FM normally described in terms of single or double sideband operations?

✅ Before You Answer

• Be clear on the difference: FM changes one property of the carrier, while AM changes another. Which property does FM change? • Check whether sideband terminology is actually used when describing standard FM voice communications. • Verify that the correct choice does NOT require changing both amplitude and frequency at the same time for FM. FM focuses on changing only one main characteristic of the carrier.