Key Topic 25: Sea Clutter - STC

Question 1

8-25C1: The STC circuit is used to:

A. Increase receiver stability.
B. Increase receiver sensitivity.
C. Increase receiver selectivity.
D. Decrease sea return on a RADAR receiver.

Answer 1

D. Decrease sea return on a RADAR receiver.

Question 2

8-25C2: The STC circuit:

A, Increases the sensitivity of the receiver for close targets.
B. Decreases sea return on the PPI scope.
C. Helps to increase the bearing resolution of targets.
D. Increases sea return on the PPI scope.

Answer 2

B. Decreases sea return on the PPI scope.

Question 3

8-25C3: Sea return is:

A. Sea water that gets into the antenna system.
B. The return echo from a target at sea.
C. The reflection of RADAR signals from nearby waves.
D. None of the above.

Answer 3

C. The reflection of RADAR signals from nearby waves.

Question 4

8-25C4: Sea clutter on the RADAR scope cannot be effectively reduced using front panel controls. What circuit would you suspect is faulty?

A. Sensitivity Time Control (STC) circuit.
B. False Target Eliminator (FTE) circuit.
C. Fast Time Constant (FTC) circuit.
D. Intermediate Frequency (IF) circuit.

Answer 4

A. Sensitivity Time Control (STC) circuit.

Question 5

8-25C5: What circuit controls the suppression of sea clutter?

A. EBL circuit.
B. STC circuit.
C. Local oscillator.
D. Audio amplifier.

Answer 5

B. STC circuit.

Question 6

8-25C6: The sensitivity time control (STC) circuit:

A. Decreases the sensitivity of the receiver for close objects.
B. Increases the sensitivity of the receiver for close objects.
C. Increases the sensitivity of the receiver for distant objects.
D. Decreases the sensitivity of the transmitter for close objects.

Answer 6

A. Decreases the sensitivity of the receiver for close objects.