Microwave Communication
The frequency of the oscillation generated by a magnetron, is mainly determined by

The number of the cavity resonators
The ratio of the dc cathode voltage to the magnetic flux density
The flux density of the external magnet
The dimension of each cavity resonator

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Microwave Communication
When used in conjunction with a radar set, the purpose of an echo box is to provide an artificial target.

Which may be used to tune the radar receiver
Tune the magnetron to the correct frequency
To the tone of the pulse repetition
Which may be used to tune the radar synchronizer

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Microwave Communication
As the electron beam moves through a klystron’s intercavity drift space

Density modulation at the input cavity creates velocity modulation at the output cavity
Phase modulation at the input cavity creates velocity modulation at the output cavity.
Velocity modulation at the input cavity creates density modulation at the output cavity
Frequency modulation at the input cavity creates velocity modulation at the output cavity

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