🔍 Key Concepts

• Artificial transmission line in RADAR systems • Difference between operational use (transmitting pulses/seeing targets) vs test/calibration use • How RADAR pulse characteristics (shape, duration, timing) are checked without external targets

💭 Think About

• Ask yourself: Is an artificial transmission line mainly for normal operation, or for simulating/testing conditions without using the antenna and real targets? • Which choice best describes a device that can simulate target returns or internal conditions so the RADAR can be checked when there is nothing to see outside? • Look at which option sounds like a primary function of a special test device, rather than something the radar already does in normal use.

✅ Before You Answer

• Check which options describe normal radar operation (things any radar does every time it’s used) and which describe special test conditions. • Verify which choice specifically involves testing or checking radar performance when real targets are not present. • Eliminate any option that suggests the line itself is used to radiate energy into space like an antenna.