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MICROWAVE COMMUNICATION

Microwave Communication
A traveling-wave tube (TWT) amplifies by virtue of

The energy liberated form the collector
The energy contained the cavity resonators
The absorption of energy by the signal from an electron stream
The effect of an external magnetic field

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

8493 mmi
6370 km
6370 mi
8493 km

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

Duplexer stage
Local oscillator
Single mixer stage
Transmitter oscillator

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

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

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

Electron transit time
Degree of emission from the cathode
Inter-electrode capacitance
Distributed lead inductance

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