Installation, Maintenance & Repair
Subelement F
Section 48
Maintenance
A thick layer of rust and corrosion on the surface of the parabolic dish will have what effect?
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No noticeable effect.
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Scatter and absorption of RADAR waves.
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Correct AnswerDecrease in performance, especially for weak targets.
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Slightly out of focus PPI scope.
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The echo box is used for:
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Testing the wavelength of the incoming echo signal.
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Correct AnswerTesting and tuning of the RADAR unit by providing artificial targets.
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Amplification of the echo signal.
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Detection of the echo pulses.
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What should be done to the interior surface of a waveguide in order to minimize signal loss?
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Fill it with nitrogen gas.
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Paint it with nonconductive paint to prevent rust.
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Correct AnswerKeep it as clean as possible.
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Fill it with a high-grade electrical oil.
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Which of the following is the most useful instrument for RADAR servicing?
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Correct AnswerOscilloscope.
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Frequency Counter.
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R. F. Wattmeter.
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Audio generator.
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A non-magnetic screwdriver should always be used when replacing what component?
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TR tube.
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Mixer.
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Video amplifier.
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Correct AnswerMagnetron.
Hint: magnet is in both the question and answer. KD9TIP
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What kind of display would indicate water in the waveguide?
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Spoking.
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Correct AnswerLarge circular rings near the center.
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Loss of range rings.
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Wider than normal targets.
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