MICROWAVE COMMUNICATION QUIZ

When it is desired that short-range targets be clearly seen on a pulsed-radar set, it is important that the receiver and display system have

The restricted high-frequency response

Low-pass filters

A long time constant

The shortest possible time

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Which of the following operating frequencies is used for the modern loran navigational system?

Loran B: 900 kHz

Loran A: 1950 kHz

Loran C: 100 kHz

Loran D: 10.2 kHz

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Coupling into and out of a traveling-wave tube can be accompanied by a

Cavity match

Waveguide match

Direct coax-helix match

All of these

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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 range

A decrease in gain

A reduction in horizontal resolution

No noticeable effect

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

Rayleigh fading

Delayed spreading

Slow fading

Random Doppler shift

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The resonant frequency of a cavity resonator depends upon

The mode of operation

Its electrical dimensions

The capacitor which tunes it

Its physical dimensions

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What is the purpose of the electromagnetic field which surrounds a traveling-wave tube?

To slow down the signal on the helix

To keep the electrons from spreading out

To velocity modulate the electron beam

To accelerate the electron

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Oscillators of a klystron tube are maintained

By feedback between the accelerating grid and the repeller

By plate-to-cathode feedback

By bunches of electrons passing the cavity grids

By circulating bunches of electrons within the cavities.

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Which of the following is used as a high power microwave oscillator?

Reflex-klystron

Magnetron

Klystron

Thyratron

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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

2π mode

π/2 mode

π mode

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