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
The Gunn diode oscillator

Depends on the formation of charge domain
Operates over a positive resistance characteristic
Is capable of generating continuous microwave power of the order of kilowatt
Generates frequencies which are below 100 MHz

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