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MICROWAVE COMMUNICATION

Microwave Communication
If the instantaneous RF potentials on the two sides of a magnetron cavity are of opposite polarity, the operation is in the

π/4 mode
π mode
2π mode
π/2 mode

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Microwave Communication
Oscillators of a klystron tube are maintained

By circulating bunches of electrons within the cavities.
By feedback between the accelerating grid and the repeller
By plate-to-cathode feedback
By bunches of electrons passing the cavity grids

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Microwave Communication
A PPI cathode-ray tube as used on a radar set

Is used to check the percentage of modulation
Indicates both the range and azimuth of a target
Is used for receiver alignment
Indicates only the range of a target

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Microwave Communication
It is possible to increase the maximum range of a radar equipment by

All of these
Raising the peak power of the transmitter
Lowering the pulse frequency
Narrowing the beam width and increasing the pulse duration

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Microwave Communication
A high-power microwave pulse of the order of megawatts can be generated by a

Traveling-wave tube
Gunn diode
Reflex klystron
Magnetron

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