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Microwave Communication

Microwave Communication
Calculate the effective earth’s radius if the surface refractivity is 301.

6370 km
8493 mmi
6370 mi
8493 km

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Microwave Communication
When it is desired that short-range targets be clearly seen on a pulsed-radar set, it is important that the receiver and display system have

The shortest possible time
Low-pass filters
A long time constant
The restricted high-frequency response

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Microwave Communication
Coupling into and out of a traveling-wave tube can be accompanied by a

All of these
Waveguide match
Cavity match
Direct coax-helix match

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

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

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Microwave Communication
The highest frequency which a conventional vacuum tube oscillator can generate is not limited by the

Electron transit time
Degree of emission from the cathode
Distributed lead inductance
Inter-electrode capacitance

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Microwave Communication
Which of the following is used as a high power microwave oscillator?

Reflex-klystron
Klystron
Thyratron
Magnetron

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