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Subel. C
6 questions
Subelement C

Receiving Systems

Section 25

Sea Clutter - STC

The STC circuit is used to:

  • Increase receiver stability.
  • Increase receiver sensitivity.
  • Increase receiver selectivity.
  • Correct Answer
    Decrease sea return on a RADAR receiver.

STC - Sensitivity Time Control is the circuit designed to reduce interference from nearby ground clutter echoes such as sea return.

Last edited by jahman. Register to edit

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The STC circuit:

  • Increases the sensitivity of the receiver for close targets.
  • Correct Answer
    Decreases sea return on the PPI scope.
  • Helps to increase the bearing resolution of targets.
  • Increases sea return on the PPI scope.

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.

Last edited by jahman. Register to edit

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Sea return is:

  • Sea water that gets into the antenna system.
  • The return echo from a target at sea.
  • Correct Answer
    The reflection of RADAR signals from nearby waves.
  • None of the above.
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Sea clutter on the RADAR scope cannot be effectively reduced using front panel controls. What circuit would you suspect is faulty?

  • Correct Answer
    Sensitivity Time Control (STC) circuit.
  • False Target Eliminator (FTE) circuit.
  • Fast Time Constant (FTC) circuit.
  • Intermediate Frequency (IF) circuit.

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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What circuit controls the suppression of sea clutter?

  • EBL circuit.
  • Correct Answer
    STC circuit.
  • Local oscillator.
  • Audio amplifier.

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"

Last edited by kacela. Register to edit

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The sensitivity time control (STC) circuit:

  • Correct Answer
    Decreases the sensitivity of the receiver for close objects.
  • Increases the sensitivity of the receiver for close objects.
  • Increases the sensitivity of the receiver for distant objects.
  • Decreases the sensitivity of the transmitter for close objects.

STC - Sensitivity Time Control is used to decrease the sensitivity of the receiver from nearby objects, thus Answer A. is the right answer.

Last edited by jahman. Register to edit

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