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Microwave Communication

Microwave Communication
Which of the following is used as an oscillator device in the SHF band?

Thyratron tube
Tunnel diode
Klystron tube
Both B and C

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

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

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Microwave Communication
The aquadag coating on the inside of PPI tube is used

All of these
To shield the electron beam from unidirectional magnetic
As a second anode and to prevent the build-up of secondary field
To focus the beam of primary electrons

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Microwave Communication
Which of the reception problems below that is not due to multipath?

Rayleigh fading
Random Doppler shift
Slow fading
Delayed spreading

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Microwave Communication
In a radar-set receiver, the usual mixer stage is

A tunnel diode
A Rochelle salts crystal
And FET
A silicon crystal

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Microwave Communication
What is the purpose of the electromagnetic field which surrounds a traveling-wave tube?

To velocity modulate the electron beam
To slow down the signal on the helix
To accelerate the electron
To keep the electrons from spreading out

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