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Microwave Communication

Microwave Communication
__________ is the progressive decrease of signal strength with increasing distance.

Modulation
Radiation
Propagation
Attenuation

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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.

Fifth
Fourth
Sixth
Third

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Microwave Communication
To achieve good bearing resolution when using a pulsed-radar set, an important requirement is

A narrow, antenna-beam width in the vertical plane
A low repetition rate
A narrow, antenna-beam width in the horizontal plane
A high duty cycle

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

Both B and C
Thyratron tube
Klystron tube
Tunnel diode

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Microwave Communication
Microwave frequencies are normally regarded as those in the range of

1 to 100 GHz
1000 to 10,000 GHz
10 to 1000 GHz
1 to 500 MHz

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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 keep the electrons from spreading out
To accelerate the electron

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