Key Topic 48: Maintenance

Question 1

8-48F1: A thick layer of rust and corrosion on the surface of the parabolic dish will have what effect?

A. No noticeable effect.
B. Scatter and absorption of RADAR waves.
C. Decrease in performance, especially for weak targets.
D. Slightly out of focus PPI scope.

Answer 1

C. Decrease in performance, especially for weak targets.

Question 2

8-48F2: The echo box is used for:

A. Testing the wavelength of the incoming echo signal.
B. Testing and tuning of the RADAR unit by providing artificial targets.
C. Amplification of the echo signal.
D. Detection of the echo pulses.

Answer 2

B. Testing and tuning of the RADAR unit by providing artificial targets.

Question 3

8-48F3: What should be done to the interior surface of a waveguide in order to minimize signal loss?

A. Fill it with nitrogen gas.
B. Paint it with nonconductive paint to prevent rust.
C. Keep it as clean as possible.
D. Fill it with a high-grade electrical oil.

Answer 3

C. Keep it as clean as possible.

Question 4

8-48F4: Which of the following is the most useful instrument for RADAR servicing?

A. Oscilloscope.
B. Frequency Counter.
C. RF Wattmeter.
D. Audio generator.

Answer 4

A. Oscilloscope.

Question 5

8-48F5: A non-magnetic screwdriver should always be used when replacing what component?

A. TR tube.
B. Mixer.
C. Video amplifier.
D. Magnetron.

Answer 5

D. Magnetron.

Question 6

8-48F6: What kind of display would indicate water in the waveguide?

A. Spoking.
B. Large circular rings near the center.
C. Loss of range rings.
D. Wider than normal targets.

Answer 6

B. Large circular rings near the center.