EXAMIANS
Which of the following operating frequencies is used for the modern loran navigational system?
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When used in conjunction with a radar set, the purpose of an echo box is to provide an artificial target.
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When it is desired that short-range targets be clearly seen on a pulsed-radar set, it is important that the receiver and display system have
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If the duration of the radar transmitted pulse, on a particular range of operation, is increased, the required bandwidth of the receiver’s IF amplifiers
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In a pulsed radar set, the function of the duplexer is to
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Theoretically electromagnetic radiation field strength varies in inverse proportion to the square of the distance, but when atmospheric attenuation effects and the absorption of the terrain are taken into account the attenuation can be as high as the inverse ___________ power of the distance.
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A shipboard equipment which measures the distance between the ship’s bottom and the ocean floor.
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The Gunn diode oscillator
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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
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Which of the following is used as an oscillator device in the SHF band?
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