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Subelement A
RADAR Principles
Section 1
Marine RADAR Systems
Choose the most correct statement containing the parameters which control the size of the target echo.
  • Correct Answer
    Transmitted power, antenna effective area, transmit and receive losses, RADAR cross section of the target, range to target.
  • Height of antenna, power radiated, size of target, receiver gain, pulse width.
  • Power radiated, antenna gain, size of target, shape of target, pulse width, receiver gain.
  • Magnetron gain, antenna gain, size of target, range to target, wave-guide loss.
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Which of the following has NO effect on the maximum range capability?
  • Carrier frequency.
  • Correct Answer
    Recovery time.
  • Pulse repetition frequency.
  • Receiver sensitivity.
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What type of transmitter power is measured over a period of time?
  • Correct Answer
    Average.
  • Peak.
  • Reciprocal.
  • Return.
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What RADAR component controls timing throughout the system?
  • Power supply.
  • Indicator.
  • Correct Answer
    Synchronizer.
  • Receiver.
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Which of the following components allows the use of a single antenna for both transmitting and receiving?
  • Mixer.
  • Correct Answer
    Duplexer.
  • Synchronizer.
  • Modulator.

Which of the following components allows the use of a single antenna for both transmitting and receiving?

(B). Duplexer.

Duplexer let send/receive happen at the same time, so you don't have to wait until someone says "Over." To do this, they used different but closely related frequencies.

For more info, please see Wikipedia's article on Duplexer

A solid Duplexer info is on Repeater Builder site, article Duplexers


YouTube: A complete video well explains the topic from TRX Lab channel, #141 Basics of Duplexers for radio repeaters; function, alignments and tests

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The sweep frequency of a RADAR indicator is determined by what parameter?
  • Carrier frequency.
  • Pulse width.
  • Duty cycle.
  • Correct Answer
    Pulse repetition frequency.
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