Question 986Navigation General

The correct answer is D) reduce clutter over the entire PPI by shortening the echoes. When the fast time constant (differentiator) control is activated on a radar, it enhances the leading and trailing edges of radar echoes, effectively shortening the echoes displayed on the PPI (Plan Position Indicator). This helps to reduce clutter and improve target detection by suppressing extended echoes, such as those from sea and land, across the entire radar display. The other options are incorrect because they do not accurately describe the primary function of the fast time constant control.