Where does the sweep start on the RHI scope?

In an RHI (Range Height Indicator) scope, the sweep starts at the lower left side of the display. This is a fundamental characteristic of how the radar scope is designed to represent range and height information for targets. The lower left side serves as the origin point where the radar's range measurements begin. From this position, the sweep moves outward in a clockwise manner, allowing users to trace the locations of targets based on their range and altitude relative to the radar's position.

This design facilitates a clear visual representation of the surrounding airspace, helping operators to quickly ascertain the positions of aircraft or obstacles at various heights. Understanding the starting point of the sweep is crucial for correctly interpreting data displayed on the RHI scope, particularly in flight operations where accurate situational awareness is essential.