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Microwave Communication

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

Thyratron tube
Tunnel diode
Klystron tube
Both B and C

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

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

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Microwave Communication
The coarse frequency adjustment of a reflex klystron is accomplished by

Varying the repeller voltage
The AFC system
Adjusting the flexible wall of the resonant cavity
An adjustment in the synchronizer

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

Rayleigh fading
Random Doppler shift
Slow fading
Delayed spreading

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Microwave Communication
A thin layer of dirt and grime coverts the reflecting surface of the parabolic dish of a radar set. The particular effect on the performance of the radar will be

A decrease in gain
A decrease in range
No noticeable effect
A reduction in horizontal resolution

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Microwave Communication
A magnetron is operated at a duty cycle of 0.001. It has a peak power output of 100 kilo-watts. Its average power is

1,000 watts
100 watts
10,000 watts
1,000,000 watts

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