EASA NAV(A)intermediate
130. What distinguishes primary radar from secondary radar?
Answer
Primary pulses reflect from aircraft; secondary pulses receive a transponder reply
Explanation
Primary radar detects reflected energy; secondary radar interrogates an airborne transponder, which sends a coded reply. **Key takeaway:** Primary is reflection-based; secondary is cooperative. **Glossary:** Transponder: airborne receiver-transmitter that replies to radar interrogation.
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