MICROWAVE COMMUNICATION QUIZ

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

Klystron tube

Both B and C

Tunnel diode

Thyratron tube

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

Rayleigh fading

Delayed spreading

Random Doppler shift

Slow fading

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

Waveguide match

Cavity match

All of these

Direct coax-helix match

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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 mode

π/4 mode

π/2 mode

2π mode

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

Single mixer stage

Duplexer stage

Transmitter oscillator

Local oscillator

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

The energy liberated form the collector

The absorption of energy by the signal from an electron stream

The effect of an external magnetic field

The energy contained the cavity resonators

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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

The shortest possible time

A long time constant

Low-pass filters

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

To velocity modulate the electron beam

To keep the electrons from spreading out

To slow down the signal on the helix

To accelerate the electron

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A reflex klystron is oscillating at the frequency of its resonant cavity. If the reflector voltage is made slightly less negative, the

Bunching would occur earlier in time

Oscillation will cease

Output power would increase

The frequency will decrease

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A shipboard equipment which measures the distance between the ship’s bottom and the ocean floor.

Fathometer

Echosounder

SONAR

LORAN

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