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Subelement A
RADAR Principles
Section 6
Pulse Width - Pulse Repetition Rates
If the PRF is 2500 Hz, what is the PRI?
  • 40 microseconds.
  • Correct Answer
    400 microseconds.
  • 250 microseconds.
  • 800 microseconds.
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If the pulse repetition frequency (PRF) is 2000 Hz, what is the pulse repetition interval (PRI)?
  • 0.05 seconds.
  • 0.005 seconds.
  • Correct Answer
    0.0005 seconds.
  • 0.00005 seconds.
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The pulse repetition rate (PRR) refers to:
  • The reciprocal of the duty cycle.
  • The pulse rate of the local oscillator tube.
  • The pulse rate of the klystron.
  • Correct Answer
    The pulse rate of the magnetron.
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If the RADAR unit has a pulse repetition frequency (PRF) of 2000 Hz and a pulse width of 0.05 microseconds, what is the duty cycle?
  • Correct Answer
    0.0001
  • 0.0005
  • 0.05
  • 0.001
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Small targets are best detected by:
  • Short pulses transmitted at a fast rate.
  • Using J band frequencies.
  • Correct Answer
    Using a long pulse width with high output power.
  • All of these answers are correct.
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What is the relationship between pulse repetition rate and pulse width?
  • Higher PRR with wider pulse width.
  • The pulse repetition rate does not change with the pulse width.
  • The pulse width does not change with the pulse repetition rate.
  • Correct Answer
    Lower PRR with wider pulse width.
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