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MICROWAVE COMMUNICATION

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

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

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Microwave Communication
The maximum usable range of the usual radar set (on any particular range setting) is determined by

The bandwidth of the receiver IF stages
The width of the transmitted pulses
The interval between transmitted pulses
The duty cycle

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

May be tested during the first five minutes of any hour
All of these
Must be capable of floating or being secured to a survival
Must have its battery replaced after emergency use

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Microwave Communication
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 range
A decrease in gain
A reduction in horizontal resolution
No noticeable effect

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

Delayed spreading
Rayleigh fading
Slow fading
Random Doppler shift

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