What is the frequency range of the Primary Surveillance Radar?

• A. 2700-2900 MHz
• B. 2600-2800 MHz
• C. 2900-3100 MHz
• D. 2800-3000 MHz

Answer: (A)

Primary Surveillance Radar operates in the S-band, typically around 2700–2900 MHz. This range is chosen because it provides a practical balance: the antennas can be reasonably sized for ground-based and airborne installations, the beamwidth and range resolution are suitable for tracking aircraft, and atmospheric losses are moderate enough to maintain reliable detection in varying weather. The other ranges would push into frequencies that are not the standard for PSR in air traffic control systems, either increasing hardware size or suffering greater weather-related issues. So the 2700–2900 MHz band is the standard PSR frequency range.