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Subel. B
6 questions
Subelement B

Transmitting Systems

Section 16

TR - ATR - Circulators - Directional Couplers-2

The ATR box:

  • Protects the receiver from strong RADAR signals.
  • Correct Answer
    Prevents the received signal from entering the transmitter.
  • Turns off the receiver when the transmitter is on.
  • All of the above.

The ATR Box prevents the received signal from entering the transmitter, thus Answer B is the right answer.

Additionally the TR Box prevents the transmitted signal from entering the receiver.

TR and ATR Boxes together conform an antenna duplexer.

Both the TR and ATR boxes are energized when the RADAR is transmitting.

ATR stands for Anti-Transmit-Receive and is a switch that disconnects the transmitter during receive and TR stands for Transmit-Receive and and is a switch that disconnects the receiver during transmit.

Last edited by jahman. Register to edit

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When a pulse RADAR is radiating, which elements in the TR box are energized?

  • The TR tube only.
  • The ATR tube only.
  • Correct Answer
    Both the TR and ATR tubes.
  • Neither the TR nor ATR tubes.

The ATR Box prevents the received signal from entering the transmitter.

Additionally the TR Box prevents the transmitted signal from entering the receiver.

TR and ATR Boxes together conform an antenna duplexer.

Both the TR and ATR boxes are energized when the RADAR is transmitting, thus Answer C. is the right answer.

ATR stands for Anti-Transmit-Receive and is a switch that disconnects the transmitter during receive and TR stands for Transmit-Receive and and is a switch that disconnects the receiver during transmit.

Last edited by jahman. Register to edit

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The TR box:

  • Prevents the received signal from entering the transmitter.
  • Protects the receiver from the strong RADAR pulses.
  • Turns off the receiver when the transmitter is on.
  • Correct Answer
    Protects the receiver from the strong RADAR pulses and mutes the receiver when the transmitter is on.

The ATR Box prevents the received signal from entering the transmitter.

Additionally the TR Box prevents the transmitted signal from entering the receiver, thus Answer D. is the right answer.

TR and ATR Boxes together conform an antenna duplexer.

Both the TR and ATR boxes are energized when the RADAR is transmitting.

ATR stands for Anti-Transmit-Receive and is a switch that disconnects the transmitter during receive and TR stands for Transmit-Receive and and is a switch that disconnects the receiver during transmit.

Last edited by jahman. Register to edit

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What device is located between the magnetron and the mixer and prevents received signals from entering the magnetron?

  • Correct Answer
    The ATR tube.
  • The TR tube.
  • The RF Attenuator.
  • A resonant cavity.

The ATR Box or ATR Tube prevents the received signal from entering the magnetron, i.e. the transmitter, thus Answer A. is the right answer.

Additionally the TR Box prevents the transmitted signal from entering the receiver.

TR and ATR Boxes together conform an antenna duplexer.

Both the TR and ATR boxes are energized when the RADAR is transmitting.

ATR stands for Anti-Transmit-Receive and is a switch that disconnects the transmitter during receive and TR stands for Transmit-Receive and and is a switch that disconnects the receiver during transmit.

Last edited by jahman. Register to edit

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A keep-alive voltage is applied to:

  • The crystal detector.
  • The ATR tube.
  • Correct Answer
    The TR tube.
  • The magnetron.

A keep-alive voltage is applied to the TR tube, thus Answer C. is the right answer.

The keep-alive voltage is applied to the TR tube to reduce the time needed for the TR tube to reconnect the antenna to the receiver after a transmitter pulse to keep the receiver from missing echo returns from nearby targets.

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A DC keep-alive potential:

  • Is applied to a TR tube to make it more sensitive.
  • Partially ionizes the gas in a TR tube, making it very sensitive to transmitter pulses.
  • Fully ionizes the gas in a TR tube.
  • Correct Answer
    Is applied to a TR tube to make it more sensitive and partially ionizes the gas in a TR tube.

A DC keep-alive potential is applied to a TR tube to make it more sensitive by maintaining the cathode temperature and preventing fluctuations in electron emission. Additionally, the DC potential partially ionizes the gas within the TR tube, making it more responsive to transmitter pulses and enhancing its amplification capabilities.

Mnemonic: "Keep-Alive - Sensitivity and Ionization"

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