While the vessel is docked the presentation of the pier is distorted near the center of the PPI with the pier appearing to bend in a concave fashion. This is a primary indication of what?
• How a radar PPI (Plan Position Indicator) displays fixed objects like piers when everything is correctly adjusted • What kind of error causes bending or curvature of straight targets toward or away from the center of the screen • Which radar components affect linearity and timing of the sweep versus which affect power or brightness
• Ask yourself: a straight pier should appear as a straight line on the PPI. If it looks bowed or concave, what part of the radar system controls how range cells line up radially from the center? • Consider which component would affect the geometry of the display (how things line up in range) versus components that mainly affect overall position, alignment, or brightness. • Think about which choice deals with timing or delay of the radar sweep, and which choices deal more with centering, magnetic fields around the CRT, or filament condition.
• Identify which option is responsible for range sweep timing/linearity, not just image centering or brightness. • Eliminate any answer focused mainly on centering the trace or magnetic alignment of the entire picture rather than bending of a straight pier image. • Verify which component, if misadjusted, would cause mid-range targets to be displaced relative to near and far ranges, making a straight object appear curved.
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