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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.
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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.
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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.
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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"

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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.
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