STC - Sensitivity Time Control is the circuit designed to reduce interference from nearby ground clutter echoes such as sea return.
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STC - Sensitivity Time Control is the time, and therefore the distance from center screen, the RADAR Receiver's sensitivity is reduced to keep sea return off the screen, thus Answer B. is the right answer.
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STC - Sensitivity Time Control is the time, and therefore the distance from center screen, the RADAR Receiver's sensitivity is reduced to keep sea return off the screen.
If the sea return can't be kept off the screen, the STC circuit must be at fault, thus Answer A. is the right answer.
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Sea clutter refers to the unwanted echoes or reflections of the RADAR signal caused by the surface of the sea. These reflections can create a background noise on the RADAR display, making it difficult to detect and distinguish other targets.
The STC circuit is a critical component in the RADAR system that automatically adjusts the receiver's sensitivity based on the time delay of the received echoes. It gradually reduces the sensitivity at shorter ranges (closer to the RADAR antenna), where sea clutter is more likely to occur, while maintaining higher sensitivity at longer ranges where the RADAR needs to detect distant targets.
By controlling the suppression of sea clutter through the STC circuit, the RADAR system can optimize its performance and enhance the visibility of targets against the cluttered background.
Mnemonic: "STC - Suppressing Targets at Close range"
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STC - Sensitivity Time Control is used to decrease the sensitivity of the receiver from nearby objects, thus Answer A. is the right answer.
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