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Microwave Communication

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

6370 km
6370 mi
8493 km
8493 mmi

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

Delayed spreading
Slow fading
Random Doppler shift
Rayleigh fading

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Microwave Communication
Theoretically electromagnetic radiation field strength varies in inverse proportion to the square of the distance, but when atmospheric attenuation effects and the absorption of the terrain are taken into account the attenuation can be as high as the inverse ___________ power of the distance.

Third
Sixth
Fifth
Fourth

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

Thyratron tube
Klystron tube
Tunnel diode
Both B and C

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

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

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Microwave Communication
In a pulsed radar set, the function of the duplexer is to

Prevent frequency drift in the klystron
All of these
Allow the transmitter and the receiver to operate from a common antenna
Aid in calibrating the display unit

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