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What oscillator is used to produce frequencies in the microwave region.
1. Wien bridge
2. Hartley
3. Klystron
4. Crystal

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Correct Answer - Option 3 : Klystron

Klystrons are the most ideal source of the microwave, used for microwave frequency measurements.

Based on the resonant cavities, klystron amplifiers are classified into two types.

  • Two cavity klystron amplifier
  • Reflex klystron amplifier

 

Important Comparisons:

The frequency range of different microwave sources are as shown:

Parameters

Klystron

Magnetron

TWTs

Frequency

Few GHz to hundred GHz

1 - 25 GHz

1 to 10 GHz

Output Power

10 MW

Several kW

Order of kW

Efficiency

10 %

30 - 60 %

20 %

Uses

Oscillator and Amplifier

Oscillator

Oscillator and Amplifier

 

Also, the frequency comparison of different oscillators are as shown:

Type of Oscillator   

Approximate frequency range
Crystal oscillator Fixed frequency
Tickler feedback oscillator Nearly fixed frequency
Wien bridge oscillator 1 Hz to 1 MHz
Phase-shift oscillator 1 Hz to 10 MHz
Hartley's oscillator  10 kHz to 100 MHz
Colpitt's oscillator  10 kHz to 100 MHz

 

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