🔍 Key Concepts

• Receiver sensitivity and what it means in practical terms • How internal noise or undesired signals affect a receiver’s ability to hear weak signals • The effect of impedance and coax type on VHF performance compared to internal receiver faults

💭 Think About

• Which choice describes a condition inside the receiver that would make it harder to detect weak incoming signals? • Is a strong internal signal or a very weak internal signal more likely to mask or interfere with the desired weak signal? • Does simply changing from 75-ohm to 50-ohm cable usually cause a significant loss of sensitivity in a properly matched VHF system?

✅ Before You Answer

• Identify which option directly affects the signal level relative to internal noise at an intermediate frequency (IF) stage. • Distinguish between a measurement condition (like a voltmeter reading) and an actual fault or interference condition inside the receiver. • Ask whether the described condition would realistically cause the receiver to miss weak VHF signals that it should otherwise hear.