MICROWAVE COMMUNICATION QUIZ

In a radar-set receiver, the usual mixer stage is

A tunnel diode

And FET

A Rochelle salts crystal

A silicon crystal

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

All of these

Prevent frequency drift in the klystron

Aid in calibrating the display unit

Allow the transmitter and the receiver to operate from a common antenna

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Rainfall is an important factor for fading of radio waves at frequencies above

10 GHz

100 MHz

1 GHz

100 GHz

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Which of the following permits a microwave signal to travel in one direction with virtually no loss, but severely attenuates any signal attempting to travel in the reverse direction?

Tunnel diode

Isolator

Wave trap

Circulator

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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

π mode

π/2 mode

2π mode

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The cavity resonator

In a reflect klystron has its output taken from the reflector plate

Has a low Q factor for narrow operation.

Is equivalent to an LC resonant circuit

Produces a frequency which is independent of the cavity size.

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What allow microwave to pass in only one direction?

Capacitor

Ferrite emitter

Varactor-triac

RF emitter

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

Rayleigh fading

Random Doppler shift

Slow fading

Delayed spreading

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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

Low-pass filters

The restricted high-frequency response

A long time constant

The shortest possible time

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__________ is the progressive decrease of signal strength with increasing distance.

Propagation

Radiation

Modulation

Attenuation

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