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Subelement C
Receiving Systems
Section 21
Local Oscillators
The error voltage from the discriminator is applied to the:
  • Correct Answer
    Repeller (reflector) of the klystron.
  • Grids of the IF amplifier.
  • Grids of the RF amplifiers.
  • Magnetron.

The error voltage from the discriminator is applied to the:

Repeller (reflector) of the klystron

In a klystron, the repeller or reflector is an essential component that helps control the electron beam and its interaction with the RF signal. The klystron is a microwave tube used in various applications, such as amplification and generation of microwave signals.

When an error voltage is applied to the repeller of the klystron, it alters the electric field strength inside the tube, which, in turn, affects the electron beam's velocity. This modulation of the electron beam's velocity helps in controlling and adjusting the output signal, ensuring stable and reliable operation of the klystron as an amplifier or oscillator.

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In a RADAR unit, the local oscillator is a:
  • Hydrogen Thyratron.
  • Correct Answer
    Klystron.
  • Pentagrid converter tube.
  • Reactance tube modulator.

In a RADAR unit, the local oscillator is a:

Klystron.

In a RADAR unit, the local oscillator is typically a "Klystron." A klystron is a type of vacuum tube used as a microwave amplifier or oscillator. It generates a stable microwave signal that is then mixed with the received radar signal to convert it to an intermediate frequency (IF) for further processing and detection.

Mnemonic: "Keep Laughing, You've Seen The Radar On!"

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What component of a RADAR receiver is represented by block 48 in Fig. 8A1?
  • Correct Answer
    Klystron (local oscillator).
  • Discriminator.
  • IF amplifier.
  • Crystal detector.
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What device(s) could be used as the local oscillator in a RADAR receiver?
  • Thyratron
  • Klystron
  • Correct Answer
    Klystron and a Gunn Diode
  • Gunn diode
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The klystron local oscillator is constantly kept on frequency by:
  • Constant manual adjustments.
  • Correct Answer
    The Automatic Frequency Control circuit.
  • A feedback loop from the crystal detector.
  • A feedback loop from the TR box.
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How may the frequency of the klystron be varied?
  • Small changes can be made by adjusting the anode voltage.
  • Large changes can be made by adjusting the frequency.
  • By changing the phasing of the buncher grids
  • Correct Answer
    Small changes can be made by adjusting the repeller voltage and large changes can be made by adjusting the size of the resonant cavity.
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