🔍 Key Concepts

• Superheterodyne receiver purpose and how it uses oscillators • Characteristics of a crystal-controlled oscillator (frequency behavior) • Difference between frequency stability and noise reduction in RF circuits

💭 Think About

• In a superheterodyne receiver, what exactly does the local oscillator need to do for proper tuning? • What is the main advantage of a crystal as a frequency-determining element compared to LC (inductor-capacitor) circuits? • Which choice best matches that main advantage, rather than a secondary or unrelated effect?

✅ Before You Answer

• Identify which option describes frequency stability over time and temperature • Check whether any option incorrectly claims crystals eliminate shielding needs or all noise • Confirm which answer aligns with the primary design reason engineers choose crystal control in receivers, not a side benefit