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Microwave Communication

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

Duplexer stage
Local oscillator
Transmitter oscillator
Single mixer stage

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

The duty cycle
The bandwidth of the receiver IF stages
The interval between transmitted pulses
The width of the transmitted pulses

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Microwave Communication
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 remain as before
May be decreased
Must be doubled
Must be increased

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Microwave Communication
Which of the following permits a microwave signal to travel in one direction with virtually no loss, but severely attenuates any signal attempting to travel in the reverse direction?

Isolator
Circulator
Wave trap
Tunnel diode

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

Rayleigh fading
Random Doppler shift
Delayed spreading
Slow 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
Fourth
Sixth
Fifth

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