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ATPL Radio > ATPL Radio > Flashcards

ATPL Radio Flashcards

1
Q

What is the speed of light in m/s?

A

3x10^8 m/s

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2
Q

What is the speed of light in nm/s?

A

162 000 nm/s

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3
Q

What is the amplitude of a wave?

A

Distance between the top of the waves and the zero value

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4
Q

What units are used to measure the amplitude of a wave?

A

Different units may be used, therefore it’s necessary to check the units given in a particular diagram or exercises. e.g. volts, metres, centimetres, etc

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5
Q

What is a cycle of variation?

A

A single wave. (Measure from the prior middle value to the next middle value. Often this “middle” value is 0 in a conventional diagram)

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6
Q

What determines the time it takes to complete one cycle?

A

The signal’s frequency

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7
Q

What unit is frequency measured in?

A

Hertz (Hz)

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8
Q

What is 1Hz equal to?

A

One cycle per second

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9
Q

To abbreviate large numbers, prefixes are used. What is Giga equal to?

A

x10^9 / 1 GigaHertz=1 billion Hertz

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10
Q

To abbreviate large numbers, prefixes are used. What is Mega equal to?

A

x10^6 / 1MegaHertz = 1 Million Hertz

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11
Q

To abbreviate large numbers, prefixes are used. What is Kilo equal to?

A

x10^3 / 1KiloHertz = 1 Thousand Hertz

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12
Q

To abbreviate large numbers, prefixes are used. What is hecto equal to?

A

x10^2 / 1HectoHertz = 100 Hertz

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13
Q

To abbreviate large numbers, prefixes are used. What is deca equal to?

A

x10^1 / 1Decahertz = 10Hertz

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14
Q

To abbreviate very small numbers, prefixes are used. What is centi equal to?

A

x10^-2 / 1CentiHertz = 1/100 Hertz

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15
Q

To abbreviate very small numbers, prefixes are used. What is deci equal to?

A

x10^-1 / 1 deciHertz = 1/10 Hertz

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16
Q

To abbreviate very small numbers, prefixes are used. What is milli equal to?

A

x10^-3 / 1 millihertz = 1/thousand Hertz

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17
Q

To abbreviate very small numbers, prefixes are used. What is micro equal to?

A

x10^-6 / 1 microhertz = 1/million Hertz

18
Q

To abbreviate very small numbers, prefixes are used. What is nano equal to?

A

x10^-9 / 1 nanohertz = 1/billion Hertz

19
Q

What does the duration of a cycle depend on?

A

The frequency

20
Q

Is the frequency higher, lower or the same when there are more cycles per second?

A

Higher

21
Q

Is wavelength proportional or inversely proportional to frequency?

A

Inversely proportional

22
Q

What happens to the wavelength as frequency decreases?

A

It increases

23
Q

What happens to wavelength as frequency increases?

A

It decreases

24
Q

What is the formula to find wavelength?

A

Wavelength = speed of light / frequency

25
Q

What is the formula to find frequency?

A

Frequency = speed of light / wavelength

26
Q

What is a frequency band?

A

A way to categorise the different frequencies found in the electromagnetic spectrum varying from microwaves to cosmic rays

27
Q

What does the carrier wave determine?

A

The frequency of a particular radio signal

28
Q

What’s a useful mnemonic to remember the radio-frequency subdivisions?

A

VLMHVUSE // Very Low Minimina Has Victor Using Safety Equipment

29
Q

What’s the frequency range for very low frequency and what’s it used for?

A

3-30kHz - very long range navigation

30
Q

What’s the frequency range for low frequency and what’s it used for?

A

30-300kHz - NDB, LW/MW broadcasting sations, Loran-C, Decca

31
Q

What’s the frequency range for medium frequency and what’s it used for?

A

300-3000kHz - NDB and radio range broadcasting stations

32
Q

What’s the frequency range for high frequency and what’s it used for?

A

3-30MHz - HF radio telephony

33
Q

What’s the frequency range for very high frequency and what’s it used for?

A

30-300MHz - VHF radio telephony, VDF, VOR, ILS, marker beacon

34
Q

What’s the frequency range for ultra high frequency and what’s it used for?

A

300-3000MHz - ILS glide path, DME and surveillance radars

35
Q

What’s the frequency range for super high frequency and what’s it used for?

A

3-30GHz - PAR, surveillance radars, Doppler, airborne weather, radar and radio altimeter

36
Q

What’s the frequency range for extremely high frequency and what’s it used for?

A

30-300GHz - Aerodrome Surface movement radar & experimental radar

37
Q

What is the doppler effect?

A

A shift of frequency of an electromagnetic wave that happens when a transmitter and receiver move in relation to each other

38
Q

What happens if the transmitter and receiver are converging towards each other?

A

Frequency increases

39
Q

What happens to the frequency if the transmitter and receiver diverge from each other?

A

Frequency decreases

40
Q

What’s the formula for Doppler shift?

A

Doppler (Hz) = relative velocity (m/s) / transmitted wavelength (m)

ATPL Radio (2 decks)

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