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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.

A hissing tone could come from a high noise floor observed by the receiver, and a varying tone can be the result of jamming (specifically a wobbler tone). If this were about regular radio transmission interference then static would be a more accurate description as the varying frequencies and amplitudes create a kind of interference found between complete constructive and complete destructive interference. However, RADAR is not just regular RF transmission. Because of the unique pulse repetition rate (PRR) of RADAR signals, the interference caused by RADAR appears as a steady tone set at the PRR.

-KQ4JXT

Last edited by spencer.chattin. Register to edit

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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

Last edited by powerjl. Register to edit

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Noise can:

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

Small targets return weaker echos (signals) to the RADAR receiver. Weak signals are allways the most subject to noise and interference in any receiver.

Last edited by jahman. Register to edit

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