🔍 Key Concepts
• Basic RADAR receiver chain: antenna, RF stage, mixer, IF stage, detector, display
• Difference between transmitter power amplifier and receiver front-end
• Trade‑off between gain, bandwidth, and noise in RF receiver stages
💭 Think About
• Think about what the receiver is trying to preserve from the echo signal before it is down‑converted: what characteristic of the pulse must remain intact?
• Which part of the RADAR set usually has the very high power and high gain: the transmitter or the receiver? How does that compare to the front end of a sensitive receiver?
• If an amplifier has extremely high gain at the RF stage, what problems could occur with strong nearby signals, noise, and stability?
✅ Before You Answer
• Review the block diagram of a pulsed RADAR receiver and identify whether a separate RF power amplifier stage is normally shown
• Consider whether the weak echo signals returning from targets need power amplification at RF, or if they are handled differently (e.g., low‑noise, controlled gain)
• Verify which stages in a RADAR system typically need wide bandwidth (pulse shape and range resolution) and whether that is usually at RF or IF