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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.
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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.

In a pulse RADAR system, the TR box (Transmitter-Receiver box) contains two essential tubes: the TR tube (Transmit-Receive tube) and the ATR tube (Antenna-Target-Receiver tube).

When the RADAR system is transmitting a pulse, the TR tube is energized to generate and amplify the high-power pulse that is transmitted from the radar's antenna. This pulse is emitted into space, and it travels until it encounters objects or targets.

When the pulse returns and reaches the antenna again after reflecting from targets, the TR box switches to receive mode. The ATR tube is then energized to amplify the weak returning echoes (reflected signals) from the targets. The amplified signals are then processed to extract target information and display it on the RADAR screen.

So, during the pulse transmission and reception process, both the TR and ATR tubes are energized at different times to handle the transmission and reception of radar signals.

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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.
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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.
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A keep-alive voltage is applied to:
  • The crystal detector.
  • The ATR tube.
  • Correct Answer
    The TR tube.
  • The magnetron.
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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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