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Subel. C
6 questions
Subelement C
Receiving Systems
Section 27
Interference Issues
One of the best methods of reducing noise in a RADAR receiver is?
  • Changing the frequency.
  • Correct Answer
    Isolation.
  • Replacing the resonant cavity.
  • Changing the IF strip.
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The primary cause of noise in a RADAR receiver can be attributed to:
  • Electrical causes.
  • Atmospheric changes.
  • Poor grounding.
  • Correct Answer
    Thermal noise caused by RADAR receiver components.
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Noise can appear on the LCD as:
  • Correct Answer
    Erratic video and sharp changes in intensity.
  • Black spots on the screen.
  • Changes in bearings.
  • None of the above.
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RADAR interference on a communications receiver appears as:
  • A varying tone.
  • Static.
  • A hissing tone.
  • Correct Answer
    A steady tone.
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In a RADAR receiver the most common types of interference are?
  • Correct Answer
    Weather and sea return.
  • Sea return and thermal.
  • Weather and electrical.
  • Jamming and electrical.

Consider for a moment the different frequencies various RADAR's use for different applications. Many Marine Search RADARs operate in the lower X-Band.

While X-Band, due to its smaller wavelength, can provide better Target resolution, it is also good at 'seeing' water droplets in "Weather" and sea spray and refraction from "Sea Return", which for a RADARs designed for Search, is not desirable.

Remember: "It can SEA the WEATHER"

Note that this does NOT apply equally to other operating bands equally, eg S, L, W, etc

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Noise can:
  • Mask larger targets.
  • Change bearings.
  • Correct Answer
    Mask small targets.
  • Increase RADAR transmitter interference.
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