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Microwave Communication

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

8493 km
6370 km
6370 mi
8493 mmi

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Microwave Communication
Which of the following operating frequencies is used for the modern loran navigational system?

Loran B: 900 kHz
Loran A: 1950 kHz
Loran D: 10.2 kHz
Loran C: 100 kHz

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Microwave Communication
A high-power microwave pulse of the order of megawatts can be generated by a

Reflex klystron
Traveling-wave tube
Gunn diode
Magnetron

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

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

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Microwave Communication
In an SHF pulsed radar set, a reflex klystron can be used as a

Single mixer stage
Transmitter oscillator
Local oscillator
Duplexer stage

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Microwave Communication
In microwave transmission using digital radio, what causes most intersymbol interference?

Delayed spreading
Slow fading
Rayleigh fading
Random Doppler shift

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