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Book 1 > 113 Technical Fundamentals > Flashcards

113 Technical Fundamentals Flashcards

1
Q

113.1 Define each band of the Electromagnetic spectrum and describe what communications are commonly used in each.
Extremely Low Frequency (ELF)

A

3–30 Hz
1-way Comms to Subs, Long Range

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2
Q

113.1 Define each band of the Electromagnetic spectrum and describe what communications are commonly used in each.
Super Low Frequency (SLF)

A

30–300 Hz
Voice Frequency

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3
Q

113.1 Define each band of the Electromagnetic spectrum and describe what communications are commonly used in each.
Ultra Low Frequency (ULF)

A

300Hz–3KHz
Subsurface Land Comms (non-Navy)

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4
Q

113.1 Define each band of the Electromagnetic spectrum and describe what communications are commonly used in each.
Very Low Frequency (VLF)

A

3–30KHz
Fleet Comms and Navigation, Long Range

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5
Q

113.1 Define each band of the Electromagnetic spectrum and describe what communications are commonly used in each.
Low Frequency (LF)

A

30–300KHz
Telegraph, Long Range

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6
Q

113.1 Define each band of the Electromagnetic spectrum and describe what communications are commonly used in each.
Medium Frequency (MF)

A

300KHz–3MHz
Commercial AM radio

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7
Q

113.1 Define each band of the Electromagnetic spectrum and describe what communications are commonly used in each.
High Frequency (HF)

A

3–30MHz
Point-to-Point(P2P), Ship-Shore, Ground-to-Air, & Fleet Broadcasts

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8
Q

113.1 Define each band of the Electromagnetic spectrum and describe what communications are commonly used in each.
Very High Frequency (VHF)

A

30–300MHz
Amphibious Operations, P2P

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9
Q

113.1 Define each band of the Electromagnetic spectrum and describe what communications are commonly used in each.
Ultra High Frequency (UHF)

A

300MHz–3GHz
Tactical Voice Comms between Ships, P2P

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10
Q

113.1 Define each band of the Electromagnetic spectrum and describe what communications are commonly used in each.
Super High Frequency (SHF)

A

3–30GHz
RADAR and Satellite Comms, P2P

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11
Q

113.1 Define each band of the Electromagnetic spectrum and describe what communications are commonly used in each.
Extremely High Frequency (EHF)

A

30–300GHz
Experimental, P2P

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12
Q

113.3 Define and discuss the following terms:
Frequency

A

The number of vibrations, or cycles, of a wave train in a unit of time.

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13
Q

113.3 Define and discuss the following terms:
Wavelength

A

The distance in space occupied by one cycle of a radio wave in a given amount of time.

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14
Q

113.3 Define and discuss the following terms:
Ducting

A

Trapping of an RF wave between two layers of the Earth’s atmosphere or between an atmospheric layer and the Earth.

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15
Q

113.3 Define and discuss the following terms:
Refraction

A

The changing of direction of a wave as it leaves one medium and enters another medium of different density.

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16
Q

113.3 Define and discuss the following terms:
Multiplexing

A

A method for simultaneous transmission of two or more signals over a common carrier wave.

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17
Q

113.3 Define and discuss the following terms:
Bandwidth

A

The difference between the highest useable frequency of a device (upper frequency limit) and the lowest usable frequency of the device (lower frequency limit) measured at the half-power points.

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18
Q

113.3 Define and discuss the following terms:
Keying

A

Relays used in radio transmitter where the ordinary hand key cannot accommodate the pate current without excessive arcing.

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19
Q

113.3 Define and discuss the following terms:
Azimuth Angle

A

The 360-degree angle at which the radio wave travels. Can have some effect on the angle of incidence at which a radio wave intersects the atmosphere layers

20
Q

113.3 Define and discuss the following terms:
Elevation Angle

A

The angle at which the radio wave travels from the antenna to the atmosphere. This affects the angle of incidence at which a radio wave intersects the atmosphere layers

21
Q

113.4 Discuss/describe the following layers of the atmosphere and how each affect communication.
Troposphere:

A

Sea level to 3.7 miles

22
Q

113.4 Discuss/describe the following layers of the atmosphere and how each affect communication.
Ionosphere

A

250 miles to space.

23
Q

113.4 Discuss/describe the following layers of the atmosphere and how each affect communication.
Stratosphere

A

3.7 miles to 250 miles

24
Q

113.5 Discuss the following terms and give a description of what each means in relation to the atmosphere.
Frequency

A

The number of vibrations, or cycles, of an EM wave in a unit of time.

25
Q

113.5 Discuss the following terms and give a description of what each means in relation to the atmosphere.
Radio Waves

A

An electromagnetic wave generated by a transmitter.

26
Q

113.5 Discuss the following terms and give a description of what each means in relation to the atmosphere.
Propagation Paths

A

Waves traveling through a medium.

27
Q

113.6 Describe the following modulation types and their common usage.
USB (Upper Sideband)

A

When modulated by voice or music signals, all of the sum frequencies above that of the carrier.

28
Q

113.6 Describe the following modulation types and their common usage.
LSB (Lower Sideband)

A

When modulated by voice or music signal, all difference frequencies below that of the carrier.

29
Q

113.6 Describe the following modulation types and their common usage.
CW (Continuous Wave)

A

Modulation by on/off keying—Morse code. (Can also be Carrier Wave – which carries multiple frequencies over one channel.)

30
Q

113.6 Describe the following modulation types and their common usage.
AM (Amplitude Modulation)

A

Any method of modulating an electromagnetic carrier frequency by varying its amplitude in accordance with message intelligence. Used diode detectors (rectifiers)

31
Q

113.6 Describe the following modulation types and their common usage.
FM (Frequency Modulation)

A

the variation of the instantaneous frequency of the carrier, either above or below the frequency.

32
Q

113.7 Define the following terms as they apply to radar.
PRI or PRT (Plan Position Indicator)

A

is the most common radar display used for (Pulse Repetition Rate is same as PRF) in which range is indicated by the distance of a bright spot or blip from the center of the screen and the bearing is indicated by the radial angle of the spot.

33
Q

113.7 Define the following terms as they apply to radar.
PRF (Pulse Repetition Frequency)

A

The rate at which pulses are transmitted, given in hertz or pulses per second. Reciprocal of pulse - repetition time.

34
Q

113.7 Define the following terms as they apply to radar.
RF (Radio Frequency):

A

the modulated carrier wave from a transmitter.

35
Q

113.7 Define the following terms as they apply to radar.
BW (Beam Width)

A

angular width of the beam’s curvature.

36
Q

113.7 Define the following terms as they apply to radar.
CW (Curve Width)

A

the width of the pulse arc

37
Q

113.7 Define the following terms as they apply to radar.
PW (Pulse Width)

A

The duration of the pulse

38
Q

113.7 Define the following terms as they apply to radar.
Scan

A

Systematic movement of a radar beam to cover a definite pattern or area in space

39
Q

113.8 Define the following.
Half Duplex

A

Provides communications in both directions, but only in one at a time.

40
Q

113.8 Define the following.
Full Duplex

A

Provides communications in both directions simultaneously.

41
Q

113.8 Define the following.
Simplex

A

Communication that occurs in one direction only

42
Q

113.9 Describe modulation for signal analysis
Modulation

A

the ability to impress intelligence upon a transmission medium such as radio waves.

43
Q

113.9 Describe modulation for signal analysis
Demodulation

A

the removal of intelligence from a Transmission medium.

44
Q

113.10 Describe bearing resolution, azimuth, and elevation angle in regards to RADAR function:
True Bearing

A

the angle between true north and a line pointed directly at the target. Relative Bearing: The bearing angle to the radar target is measured from the centerline of your own ship or aircraft.

45
Q

113.10 Describe bearing resolution, azimuth, and elevation angle in regards to RADAR function:
Azimuth

A

Angular measurement in the horizontal plane in a clockwise direction.

46
Q

113.10 Describe bearing resolution, azimuth, and elevation angle in regards to RADAR function:
Elevation

A

Used by height finding radars, Uses a very narrow beam in both horizontal and vertical search planes.

Book 1 (15 decks)

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