How long does it take for the radar to warm up?

• A. 60 seconds
• B. 120 seconds
• C. 200 seconds
• D. 90 seconds

Answer: (B)

Radars need a warm-up period to reach stable operating conditions before use. This lets the transmitter tubes or modules reach normal temperature and voltage stabilization, allows the receiver and filters to settle, and gives the display and scanning mechanism time to initialize. With everything stabilized, the radar can produce accurate range and bearing information and consistent video quality.

About two minutes is typically specified so the system fully stabilizes. Shorter times might not allow full stabilization, risking unstable output or drift, while longer times are usually unnecessary for standard magnetron-based radar systems. So the best choice is the two-minute warm-up.