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.

Fifth

Third

Sixth

Fourth

Fifth

Third

Sixth

Fourth

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Microwave Communication
What do you call an attenuation that occurs over many different wavelengths of the carrier?

Rician fading

Wavelength fading

Slow fading

Rayleigh fading

Rician fading

Wavelength fading

Slow fading

Rayleigh fading

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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 gain

A decrease in range

No noticeable effect

A reduction in horizontal resolution

A decrease in gain

A decrease in range

No noticeable effect

A reduction in horizontal resolution

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Microwave Communication
The antenna separations (in meters) required for optimum operation of a space diversity system can be calculated from:where R = effective earth radius (m) and L = path length (m)

S = 3λR/L

S = 2λR/L

S = λR/L

S = λR/RL

S = 3λR/L

S = 2λR/L

S = λR/L

S = λR/RL

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Microwave Communication
When used in conjunction with a radar set, the purpose of an echo box is to provide an artificial target.

Which may be used to tune the radar synchronizer

Tune the magnetron to the correct frequency

Which may be used to tune the radar receiver

To the tone of the pulse repetition

Which may be used to tune the radar synchronizer

Tune the magnetron to the correct frequency

Which may be used to tune the radar receiver

To the tone of the pulse repetition

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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?

Tunnel diode

Isolator

Wave trap

Circulator

Tunnel diode

Isolator

Wave trap

Circulator

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Microwave Communication

Microwave Communication What do you call an attenuation that occurs over many different wavelengths of the carrier?

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

Microwave Communication The antenna separations (in meters) required for optimum operation of a space diversity system can be calculated from:where R = effective earth radius (m) and L = path length (m)

Microwave Communication When used in conjunction with a radar set, the purpose of an echo box is to provide an artificial target.

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?

Microwave Communication
What do you call an attenuation that occurs over many different wavelengths of the carrier?

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

Microwave Communication
The antenna separations (in meters) required for optimum operation of a space diversity system can be calculated from:where R = effective earth radius (m) and L = path length (m)

Microwave Communication
When used in conjunction with a radar set, the purpose of an echo box is to provide an artificial target.

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?