Microwave Communication
A Class-S Emergency Position-Indicating Radio Beacon (E.P.I.R.B)

All of these
Must have its battery replaced after emergency use
Must be capable of floating or being secured to a survival
May be tested during the first five minutes of any hour

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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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Microwave Communication
In a pulsed radar set, the STC circuit is used to

Increases receiver sensitivity for echoes from targets
Vary the pulse frequency in order to control the maximum target
Improve the target bearing resolution
Reduce interference from the effects of sea return

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