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.

Microwave Communication
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.

Sixth

Third

Fourth

Fifth

Sixth

Third

Fourth

Fifth

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Microwave Communication
The cavity resonator

Has a low Q factor for narrow operation.

Produces a frequency which is independent of the cavity size.

In a reflect klystron has its output taken from the reflector plate

Is equivalent to an LC resonant circuit

Has a low Q factor for narrow operation.

Produces a frequency which is independent of the cavity size.

In a reflect klystron has its output taken from the reflector plate

Is equivalent to an LC resonant circuit

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

LORAN

SONAR

Echosounder

Fathometer

LORAN

SONAR

Echosounder

Fathometer

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Microwave Communication
The coarse frequency adjustment of a reflex klystron is accomplished by

An adjustment in the synchronizer

Adjusting the flexible wall of the resonant cavity

The AFC system

Varying the repeller voltage

An adjustment in the synchronizer

Adjusting the flexible wall of the resonant cavity

The AFC system

Varying the repeller voltage

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Microwave Communication
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

A long time constant

The shortest possible time

Low-pass filters

The restricted high-frequency response

A long time constant

The shortest possible time

Low-pass filters

The restricted high-frequency response

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Microwave Communication
Which of the following is used as an oscillator device in the SHF band?

Tunnel diode

Klystron tube

Thyratron tube

Both B and C

Tunnel diode

Klystron tube

Thyratron tube

Both B and C

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Microwave Communication

Microwave Communication The cavity resonator

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

Microwave Communication The coarse frequency adjustment of a reflex klystron is accomplished by

Microwave Communication 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

Microwave Communication Which of the following is used as an oscillator device in the SHF band?

Microwave Communication
The cavity resonator

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

Microwave Communication
The coarse frequency adjustment of a reflex klystron is accomplished by

Microwave Communication
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

Microwave Communication
Which of the following is used as an oscillator device in the SHF band?