MICROWAVE COMMUNICATION QUIZ

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

Loran C: 100 kHz

Loran B: 900 kHz

Loran A: 1950 kHz

Loran D: 10.2 kHz

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As the electron beam moves through a klystron’s intercavity drift space

Phase modulation at the input cavity creates velocity modulation at the output cavity.

Density modulation at the input cavity creates velocity modulation at the output cavity

Frequency modulation at the input cavity creates velocity modulation at the output cavity

Velocity modulation at the input cavity creates density modulation at the output cavity

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Which causes multipath or frequency selective fading?

Small reflector

Large reflector

Further reflector

Nearer reflector

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

SONAR

Fathometer

Echosounder

LORAN

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

Delayed spreading

Rayleigh fading

Random Doppler shift

Slow fading

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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 = λR/L

S = λR/RL

S = 3λR/L

S = 2λR/L

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The main frequency determining element of a klystron is

The repeller voltage

The accelerating voltage

Its resonant cavity

Its mode of operation

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

Modulation

Attenuation

Radiation

Propagation

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The frequency of the oscillation generated by a magnetron, is mainly determined by

The number of the cavity resonators

The flux density of the external magnet

The dimension of each cavity resonator

The ratio of the dc cathode voltage to the magnetic flux density

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Calculate the effective earth’s radius if the surface refractivity is 301.

8493 mmi

6370 km

8493 km

6370 mi

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