MICROWAVE COMMUNICATION QUIZ

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

Duplexer stage

Transmitter oscillator

Local oscillator

Single mixer stage

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The antenna separations (in meters) required for optimum operation of a space diversity system can be calculated from:where R = effective earth radius (m) and L = path length (m)

S = 3λR/L

S = λR/L

S = 2λR/L

S = λR/RL

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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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What do you call an attenuation that occurs over many different wavelengths of the carrier?

Slow fading

Wavelength fading

Rayleigh fading

Rician fading

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

10 GHz

100 GHz

1 GHz

100 MHz

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The cavity resonator

Is equivalent to an LC resonant circuit

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

Produces a frequency which is independent of the cavity size.

Has a low Q factor for narrow operation.

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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 gain

A decrease in range

A reduction in horizontal resolution

No noticeable effect

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A magnetron is operated at a duty cycle of 0.001. It has a peak power output of 100 kilo-watts. Its average power is

1,000 watts

1,000,000 watts

100 watts

10,000 watts

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

Tunnel diode

Thyratron tube

Klystron tube

Both B and C

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

Indicates only the range of a target

Indicates both the range and azimuth of a target

Is used for receiver alignment

Is used to check the percentage of modulation

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