MICROWAVE COMMUNICATION QUIZ

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

A high duty cycle

A low repetition rate

A narrow, antenna-beam width in the vertical plane

A narrow, antenna-beam width in the horizontal plane

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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

Third

Sixth

Fourth

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Oscillators of a klystron tube are maintained

By feedback between the accelerating grid and the repeller

By circulating bunches of electrons within the cavities.

By plate-to-cathode feedback

By bunches of electrons passing the cavity grids

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The Gunn diode oscillator

Is capable of generating continuous microwave power of the order of kilowatt

Generates frequencies which are below 100 MHz

Depends on the formation of charge domain

Operates over a positive resistance characteristic

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

Distributed lead inductance

Electron transit time

Degree of emission from the cathode

Inter-electrode capacitance

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The maximum usable range of the usual radar set (on any particular range setting) is determined by

The width of the transmitted pulses

The duty cycle

The bandwidth of the receiver IF stages

The interval between transmitted pulses

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Microwave frequencies are normally regarded as those in the range of

1 to 100 GHz

10 to 1000 GHz

1 to 500 MHz

1000 to 10,000 GHz

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Which causes multipath or frequency selective fading?

Further reflector

Large reflector

Nearer reflector

Small reflector

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

Thyratron tube

Tunnel diode

Both B and C

Klystron tube

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If the duration of the radar transmitted pulse, on a particular range of operation, is increased, the required bandwidth of the receiver’s IF amplifiers

Must be doubled

Must be increased

Must remain as before

May be decreased

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