🔍 Key Concepts

• FM VHF receiver behavior as signal strength increases • Meaning of receiver background noise and how it sounds when no signal is present • Basic idea of SINAD (Signal-plus-Noise-and-Distortion) and what “quieting” suggests

💭 Think About

• When you slowly increase a received signal from very weak to very strong, what happens to the hiss/background noise you hear on an FM receiver? • Does “full quieting” sound more like a small change or a point where something is essentially gone or masked? • Which options describe changes as signal level goes up vs. down, and which one directly describes the condition of the receiver at that moment?

✅ Before You Answer

• Identify which answers talk about adjusting a control vs. a condition of the received signal. • Note which options describe behavior as signal level changes (increasing or decreasing) rather than a specific quiet state. • Focus on the choice that directly describes the receiver’s audio when the signal is strong enough that background noise is no longer heard.