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Subelement A
RADAR Principles
Section 4
Power, Pulse Width, PRR
A pulse RADAR has a pulse repetition frequency (PRF) of 400 Hz, a pulse width of 1 microsecond, and a peak power of 100 kilowatts. The average power of the RADAR transmitter is:
  • 25 watts.
  • Correct Answer
    40 watts.
  • 250 watts.
  • 400 watts.
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A shipboard RADAR transmitter has a pulse repetition frequency (PRF) of 1,000 Hz, a pulse width of 0.5 microseconds, peak power of 150 KW, and a minimum range of 75 meters. Its duty cycle is:
  • 0.5
  • 0.05
  • 0.005
  • Correct Answer
    0.0005
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A pulse RADAR transmits a 0.5 microsecond RF pulse with a peak power of 100 kilowatts every 1600 microseconds. This RADAR has:
  • Correct Answer
    An average power of 31.25 watts.
  • A PRF of 3,200.
  • A maximum range of 480 kilometers.
  • A duty cycle of 3.125 percent.
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If a RADAR transmitter has a pulse repetition frequency (PRF) of 900 Hz, a pulse width of 0.5 microseconds and a peak power of 15 kilowatts, what is its average power output?
  • 15 kilowatts.
  • 13.5 watts.
  • Correct Answer
    6.75 watts.
  • 166.67 watts.
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What is the average power if the RADAR set has a PRF of 1000 Hz, a pulse width of 1 microsecond, and a peak power rating of 100 kilowatts?
  • 10 watts.
  • Correct Answer
    100 watts.
  • 1,000 watts.
  • None of these.
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A search RADAR has a pulse width of 1.0 microsecond, a pulse repetition frequency (PRF) of 900 Hz, and an average power of 18 watts. The unit's peak power is:
  • 200 kilowatts.
  • 180 kilowatts.
  • Correct Answer
    20 kilowatts.
  • 2 kilowatts.
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