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

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

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Microwave Communication
The cavity resonator

Is equivalent to an LC resonant circuit
Has a low Q factor for narrow operation.
In a reflect klystron has its output taken from the reflector plate
Produces a frequency which is independent of the cavity size.

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