MICROWAVE COMMUNICATION QUIZ

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

Slow fading

Random Doppler shift

Rayleigh fading

Delayed spreading

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What allow microwave to pass in only one direction?

Varactor-triac

RF emitter

Ferrite emitter

Capacitor

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The highest frequency which a conventional vacuum tube oscillator can generate is not limited by the

Inter-electrode capacitance

Electron transit time

Degree of emission from the cathode

Distributed lead inductance

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

Is used for receiver alignment

Indicates only the range of a target

Indicates both the range and azimuth of a target

Is used to check the percentage of modulation

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

Echosounder

Fathometer

LORAN

SONAR

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If k-factor is greater than 1, the array beam is bent

Towards the earth

Towards the ionosphere,

Towards the outer space

Away from the earth

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In a pulsed radar set, the STC circuit is used to

Reduce interference from the effects of sea return

Vary the pulse frequency in order to control the maximum target

Improve the target bearing resolution

Increases receiver sensitivity for echoes from targets

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A Class-S Emergency Position-Indicating Radio Beacon (E.P.I.R.B)

Must be capable of floating or being secured to a survival

Must have its battery replaced after emergency use

All of these

May be tested during the first five minutes of any hour

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

Loran C: 100 kHz

Loran D: 10.2 kHz

Loran A: 1950 kHz

Loran B: 900 kHz

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