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Microwave Communication

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

8493 mmi
6370 km
8493 km
6370 mi

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

Loran B: 900 kHz
Loran C: 100 kHz
Loran A: 1950 kHz
Loran D: 10.2 kHz

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Microwave Communication
The resonant frequency of a cavity resonator depends upon

The mode of operation
Its physical dimensions
The capacitor which tunes it
Its electrical dimensions

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Microwave Communication
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?

Wave trap
Isolator
Tunnel diode
Circulator

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Microwave Communication
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

1,000,000 watts
100 watts
1,000 watts
10,000 watts

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

Rayleigh fading
Slow fading
Random Doppler shift
Delayed spreading

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