Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Navigation > Radio Navigation Theory > Flashcards

Radio Navigation Theory Flashcards

1
Q

Wavelength

A

Length of a single wave (cycle)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Frequency

A

Number of cycles expressed in Hertz (Hz)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Amplitude

A

Displacement of wave peaks or troughs from the middle value
Measures the strength of the signal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Modulation

A

Variation to amplitude, frequency or phase using another waveform (speech/music)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Amplitude Modulation (AM)

A

The amplitude of carrier wave is varied with frequency constant
Requires extra power to modulate
Increased modulation depth equals increased signal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Frequency Modulation (FM)

A

Varies frequency of the carrier wave
Requires less power and is static free but receivers are more complex and the bandwidth much higher than AM

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Bandwidth

A

Amount of frequency spectrum required to transmit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Side bands

A

Additional frequencies which occur when a carrier wave is modulated by a frequency lower than itself
Carry the intelligence (information)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Transmission Economy

A

Elimination of high energy AM carrier

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Ground Wave

A

Part of radio wave that travels parallel to the Earth’s surface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Direct Waves

A

Direct from transmitter to receiver

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Surface Waves

A

Follow the contour of the Earth’s surface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Sky Waves

A

Refracted and reflected by the ionosphere

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Out of Phase

A

Causes fading and loss of signal due radio waves travelling different paths

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Attenuation

A

Range of surface wave
The rate at which the signal is absorbed/weakened by surfaces
Lower frequencies suffer less attenuation than VHF

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Line of Sight

A

UHF and VHF use line of sight (direct wave)

17
Q

Max Theoretical Range of VHF

A

Atmospheric retraction slightly increases the range of VHF beyond the line of sight
Theoretical range in nm = √1.5 x receiver alt (ft)
Receiver range + transmitter range

18
Q

VHF Rated Coverage at Night

A

Decreases due to increased sky wave interference with the higher ionosphere
Therefore HF frequencies are higher in the day

19
Q

Skip Distance

A

Distance from transmitter to point where the sky wave returns to Earth

Navigation (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions