Klystron Oscillator - BNMIT-NSP

The modes in a reflex Klystron

• give the same frequency but different transit times

• result from excessive transit time across the resonator gap

• are caused by spurious frequency modulation

• are just for theoretical considerations

Klystron operates on the principle of

• Amplitude Modulation

• Frequency Modulation

• Pulse Modulation

• Velocity Modulation

Who are the inventors of the klystron

• Russell and Sigurd Varian 

• Wilbur and Orville

Identify the Klystron Oscillator

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Efficient Microwave tubes usually operate on the theory of

• electron velocity modulation

• amplitude modulation

• frequency modulation

• phase modulation

The ............................ is used in the conversion of dc power to RF power

• electron transit time

• reverse time

----------------is used for analysing the electron bunching

• apple gate diagram

• Orange gate diagram

• Banana gate diagram

• grape bunch diagram

If T is the time period at the resonant frequency,  to is the time taken by the reference electron to travel in the repeller space between entering the repeller space and returning to the cavity at positive peak voltage on formation of the bunch

Then, Optimum transit time is given by

• to = (n + ¾)T

• to = (n/2 + ¾)T

• to = (n/4 + ¾)T

• to = (n/3 + ¾)T

Reflex Klystron is used to generate

• 2 to 200GHz

• 1 to 2 GHz

• 200 to 300GHz

• 1 to 100GHz

Maximum efficiency of Klystron oscillator is

• 22.78%

• 35.78%

• 50.78%

• 99.78%