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Radio Navigation > Basic Propagation Theory > Flashcards

Basic Propagation Theory Flashcards

1
Q

What is an NDB connected with?

A

ADF

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2
Q

What type of indication do radio waves give?

A

Magnetic

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3
Q

What is the speed of light in nautical miles per second?

A

161,800nm/s

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4
Q

What is a cycle?

A

A completed series of values of a periodical process.

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5
Q

What is the principle of operation of a vor?

A

Phase angle

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6
Q

Whats another name for direct and line of sight waves?

A

Space waves.

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7
Q

What frequency does ILS LOC use?

A

Very high

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8
Q

What frequency does ILS GP use?

A

Ultra High

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9
Q

What is the first character of a radio signal?

A

The type of modulation.

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10
Q

What is the second character of a radio signal?

A

Nature of the signal

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11
Q

What is the third character of a radio signal?

A

Type of information transmitted

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12
Q

What is the code for a carrier without modulation?

A

N0N

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13
Q

What is the code for a carrier with keyed morse code modulation?

A

A1A

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14
Q

What is the code for a carrier with amplitude modulated morse code?

A

A2A

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15
Q

Whats the code for a carrier with amplitude modulated speech?

A

A3E

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16
Q

Whats the code for a DME?

A

P0N

17
Q

Whats the code for an ILS?

A

A8W

18
Q

Whats the code for a VOR?

A

A9W

19
Q

What is the simplest form of modulation?

A

Keying

20
Q

Where would you see single sidebands?

A

HF comms and HF VOLMET

21
Q

Any conductor with an alternating current through it because a what?

A

Wave transducer

22
Q

What is the simplest form of an antenna?

A

Half wave dipole

23
Q

Where do you get no signal on a dipole antenna?

A

Above

24
Q

Where would you find a loop antenna?

A

ADF

25
Q

Where would you find a parabolic antenna?

A

Older AWR

26
Q

Where would you find a slotted planar array antenna?

A

Modern AWR

27
Q

Where would you see a helical antenna?

A

GPS

28
Q

What frequency and above only sees space and line of sight wave propagation?

A

VHF

29
Q

What ionosphere layer disappears at night?

A

D

30
Q

What is the skip distance?

A

Aerial to first returning sky wave.

31
Q

Whats skip zone?

A

Distance between surface wave and first returning sky wave.

32
Q

What does natural static noise affect?

A

VHF and below

33
Q

What does man made static noise affect?

A

VHF and above

34
Q

What is Fading?

A

Interference of a ground wave and a sky wave.

35
Q

A student pilot has just learnt that meteorological information for aircraft en route on long-haul flights is sent by radio. What kind of radio receiver is needed to receive this information?

A

Single side band reciever

36
Q

Which aeronautical radio frequency band uses refraction within ionospheric layers?

A

HF

37
Q

Which aeronautical radio frequency band uses refraction within ionospheric layers?

A

HF

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