Radar Tuning: FTC (Rain) reduces rain effects and can help with reducing the effects of jamming. Which circuit behavior is associated with FTC?

• A. FTC (Rain) tuning reduces rain effects and can help with reducing jamming; circuit allows only leading edge of target to be returned.
• B. STC (Sea State) tuning reduces rain effects.
• C. IS Feature tuning reduces interference.
• D. Anti Jamming Controls tuning reduces rain.

Answer: (A)

The idea being tested is how a rain-focused filter time constant (FTC) changes the receiver’s response to clutter. By using a short filter time constant for rain, the radar reduces how long a clutter return from rain stays in the video. This makes rain clutter less dominant and can also help limit signals that rely on a steady, ongoing energy—such as certain jamming signals.

In this sense, the circuit behavior associated with FTC (Rain) is effectively to gate the received signal so only the initial portion of the target echo gets through—the leading edge. By passing the leading edge and attenuating the rest, the system suppresses lingering clutter from rain and makes it harder for continuous interference to dominate the display, which is why FTC can aid both rain reduction and jamming mitigation.

Sea State tuning, IS feature tuning, and Anti-Jamming Controls tuning relate to other forms of clutter or interference suppression, not specifically to shortening the temporal window and emphasizing the leading edge like FTC Rain tuning.