NAVEDTRA 14189A, NEETS Mod. 17, Ch. 5 Flashcards

1
Q

The frequency range from ELF to SHF is from below 300 hertz up to how many gigahertz?

A

30

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2
Q

What is a non-radiating device called that absorbs the rf and has the impedance characteristics of the antenna?

A

Dummy load

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3
Q

What is a small building called that is physically separated from the transmitter location that contains antenna loading, coupling, and tuning circuits?

A

Helix house

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4
Q

Which type of antenna is a special form of a rhombic-arranged monopole array that is designed to transmit from a particular location?

A

Triatic

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5
Q

Communications systems in which portion of the radio frequency spectrum use line-of-sight propagation?

A

1 to 10 gigahertz

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6
Q

The distance between microwave system hop points ranges from 50 to 150 kilometers (31 to how many statute miles)?

A

95

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7
Q

The tropo system uses the turbulence in the layer between the troposphere and the stratosphere to bounce signals back to earth and has a transmission range up to 800 kilometers (how many statute miles)?

A

500

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8
Q

HF has a hop distance (skywave) of about how many miles?

A

1,400

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9
Q

The distance of one hop for a line-of-sight system is between 31 and how many miles?

A

95

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10
Q

What was developed by the U.S. Navy as a command tool for commanders in tactical combat situations?

A

NTDS

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11
Q

How many separate data transmission links does NTDS use to maintain tactical data communications between tactical units?

A

Three

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12
Q

What provides high-speed, computer-to-computer transfer of tactical information, command orders, and unit status to all tactical data systems?

A

Link 11

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13
Q

What provides a means of transmitting track information to those units not capable of participating in the link 11 network?

A

Link 14

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14
Q

What permits the computer to take control of the autopilot in an equipped aircraft?

A

Link 4A

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15
Q

What is the international distress frequency?

A

500 Kilohertz

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16
Q

What is the survival craft communications frequency?

A

8,364 kilohertz

17
Q

What take energy at (or near) the visible light spectrum and convert it to a very narrow and intense beam in the same region?

A

Lasers

18
Q

Which color of communications lasers could possibly penetrate the ocean to great depths?

A

Blue-green

19
Q

What is a type of two-equipment installation where one unit can be substituted for another in the event of failure?

A

Doubling up

20
Q

What acts as a coil and is used with variable inductors for impedance matching of high-power transmitters?

A

Helix

21
Q

What are conductors or optical waveguides called that readily pass light?

A

Fiber optics