Which term corresponds to Blind/Shadow Sectors?

• A. SERRATED RANGE RINGS
• B. Water in the Waveguide
• C. Power Line Effect
• D. Sub Refraction

Answer: (A)

Blind/shadow sectors are areas where the radar beam cannot illuminate targets because terrain or structures block the line of sight. The way this shows up on the display is through serrated range rings—the rings appear jagged or cut away along certain azimuths, signaling that part of the circle is blocked and targets in those directions may be hidden. This serrated pattern is the clearest visual cue that a sector is shadowed and unreliable for detection, helping you interpret gaps in the radar picture. Other radar phenomena aren’t about this specific visualization: water in the waveguide affects signal loss; power line effect creates linear clutter; sub refraction refers to beam bending due to atmospheric conditions.