🔍 Key Concepts

• Basic radar block diagram: transmitter, duplexer/circulator, antenna, receiver • Difference between waveguide couplers/adapters and electronic switching devices • Why most marine radars can transmit and receive on one antenna without damage to the receiver

💭 Think About

• In a typical marine radar, what component protects the sensitive receiver from the high-power transmitter pulses while still using a single antenna? • Which option describes a function that must alternate very quickly between transmit and receive with every pulse? • Which choices are about sampling or changing waveguide shape, and which are about controlling the signal path between transmitter, antenna, and receiver?

✅ Before You Answer

• Identify which option clearly refers to using one antenna for both transmission and reception. • Eliminate any option that only discusses changing waveguide shape without mentioning switching or protection. • Ask yourself: which device must act like a very fast switch or directional device between the transmitter, antenna, and receiver?