Microwave Communication
A traveling-wave tube (TWT) amplifies by virtue of

The energy contained the cavity resonators
The absorption of energy by the signal from an electron stream
The effect of an external magnetic field
The energy liberated form the collector

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

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