🔍 Key Concepts

• Typical intermediate frequency (IF) used in marine radar receivers • Difference between intermediate frequency and radio frequency (RF) or transmitted frequency • Common IF values used in superheterodyne receivers in general electronics

💭 Think About

• Which of these frequencies is commonly used as an IF in many radio receivers, not just radar? • Which frequencies seem more likely to be associated with VHF/UHF communication bands rather than an internal radar receiver stage? • Think about whether marine radar needs a relatively low, stable IF or a very high one for its signal processing.

✅ Before You Answer

• Identify which option matches a widely used standard IF in superheterodyne receivers • Eliminate any frequencies that are more typical of transmitter operating frequencies than intermediate stages • Confirm that the chosen value is reasonable for filtering and amplification stages inside a radar receiver