263. In a RADAR using digital video processing, a bright, wide ring appears at a fixed distance from the center of the display on all digital ranges. The transmitter is operating normally. What receiver circuit would you suspect is causing the problem?

A persistent, fixed-range ring across all digital scales indicates a faulty video storage RAM or shift register, which stores digitized radar data by range cell. This component's failure results in a constant, bright signal at a specific range, appearing as a ring regardless of bearing or range scale, while other receiver circuits affect markers or reference rings, not the underlying video data.