Microwave Communication
The highest frequency which a conventional vacuum tube oscillator can generate is not limited by the

Electron transit time
Distributed lead inductance
Inter-electrode capacitance
Degree of emission from the cathode

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

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