8-F-48: Maintenance
8-48F1:
A thick layer of rust and corrosion on the surface of the parabolic dish will have what effect?
Decrease in performance, especially for weak targets.
No noticeable effect.
Scatter and absorption of RADAR waves.
Slightly out of focus PPI scope.
8-48F2:
The echo box is used for:
Testing and tuning of the RADAR unit by providing artificial targets.
Testing the wavelength of the incoming echo signal.
Amplification of the echo signal.
Detection of the echo pulses.
8-48F3:
What should be done to the interior surface of a waveguide in order to minimize signal loss?
Keep it as clean as possible.
Fill it with nitrogen gas.
Paint it with nonconductive paint to prevent rust.
Fill it with a high-grade electrical oil.
8-48F4:
Which of the following is the most useful instrument for RADAR servicing?
Oscilloscope.
Frequency Counter.
R. F. Wattmeter.
Audio generator.
8-48F5:
A non-magnetic screwdriver should always be used when replacing what component?
Magnetron.
TR tube.
Mixer.
Video amplifier.
8-48F6:
What kind of display would indicate water in the waveguide?
Large circular rings near the center.
Spoking.
Loss of range rings.
Wider than normal targets.
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Color key:
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● = Unseen
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● = Weak
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● = Review
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● = Learned
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● = Incorrect answer
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