🔍 Key Concepts

• Intermediate frequency (IF) stages in a superheterodyne HF receiver • Differences between a high first IF and a low IF (selectivity, image rejection) • How image signals and selectivity/gain are affected by IF choice

💭 Think About

• Ask yourself: What does choosing a high first IF mainly help with in terms of unwanted signals near the tuning frequency? • Then ask: What does making an IF lower allow you to do with filters and amplification (narrow bandwidth vs gain)? • Which choice is talking about the effect that is most commonly associated with changing the IF frequency in receiver design?

✅ Before You Answer

• Be clear on what an image signal is and how its separation from the desired signal depends on IF frequency. • Verify which of the options actually mentions an effect that is normally tied to IF selection (not something more related to transmitter harmonics). • Check which option best matches the typical design goal of a dual-conversion HF receiver: good image rejection plus good selectivity.