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PPL > Radio Communications > Flashcards

Radio Communications Flashcards

1
Q

What type of radio waves are primarily used in aviation communication?

A

Aviation uses Very High Frequency (VHF) radio waves for voice communication, typically in the range of 118.0 to 136.975 MHz.
30MHz-300MHz

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2
Q

Why are VHF radio waves preferred for aviation communication?

A

VHF radio waves are less susceptible to interference and provide clear, line-of-sight communication, which is ideal for air-to-ground and air-to-air communications within range.

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3
Q

What is the standard frequency range for VHF used in aircraft communication?

A

VHF frequency range from 30 MHz to 300 MHz.

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4
Q

What is the role of Air Traffic Control (ATC) in aviation radio communication?

A

ATC provides pilots with guidance, clearances, and instructions to ensure safe and orderly air traffic flow.

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5
Q

What phrase should a pilot use to indicate they have understood and will comply with ATC instructions?

A

The phrase “Wilco” is used to acknowledge that the message was received and complied with.

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6
Q

What does the phrase “Say Again” mean in aviation communication?

A

“Say Again” is used when a pilot or controller needs the other party to repeat their last transmission for clarity.

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7
Q

What does the phrase “Standby” mean in aviation radio communications?

A

“Standby” means to wait without transmitting until further notice, Do not reply to a standby

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8
Q

What is the HF frequency range

A

3MHz-30MHz

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9
Q

How do High Frequency (HF) radio waves differ from VHF in aviation?

A

HF radio waves, used for long-range communication over oceans, can travel further than VHF but are more susceptible to atmospheric interference.

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10
Q

What is the importance of “readback” in aviation communication?

A

“Readback” requires the pilot to repeat ATC instructions to confirm correct understanding, crucial for avoiding miscommunication.

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11
Q

What does the phrase “Cleared for Takeoff” mean?

A

“Cleared for Takeoff” is ATC authorization for the pilot to begin the takeoff roll.

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12
Q

What does “Cleared to Land” mean in radio communications?

A

“Cleared to Land” is ATC authorization for the aircraft to proceed with landing on the designated runway.

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13
Q

When would a pilot use “Mayday” in a radio call?

A

“Mayday” is used in emergency situations to indicate imminent danger and request immediate assistance.

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14
Q

What phrase is used to indicate a less urgent situation that still requires assistance?

A

“Pan-Pan” is used for situations that are urgent but not life-threatening, such as equipment malfunctions or non-critical medical issues.

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15
Q

What is the purpose of the squelch control on a VHF radio?

A

The squelch control reduces background noise by blocking weaker signals, making stronger transmissions clearer.

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16
Q

Why do pilots use the phonetic alphabet in aviation communication?

A

The phonetic alphabet is used to prevent misunderstandings by clarifying letters and numbers in poor transmission conditions.

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17
Q

Why are specific frequency allocations important in aviation?

A

Specific frequencies prevent overlapping communications and ensure each area or sector has a dedicated frequency for clear communication.

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18
Q

What is the purpose of radio?

A

The purpose of the radio is to convert our voices (sound waves) into radio waves.
To be able to communicate with ATC and other pilots

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19
Q

How fast do radio waves travel?

A

At the speed of light 300 million m/sec.

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20
Q

Can you tune sound waves to a single frequency?

A

No, you cannot; that is why we use radio waves.

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21
Q

Where do low frequency (LF) bands send their energy?

A

Low frequency transmissions tend to send most of their energy through the ground or water in the form of a ground wave.

22
Q

Where does High Frequency (HF) send most of their energy?

A

High frequency transmissions send most of their energy through space as sky waves.

23
Q

What is the range for low frequency (LF) and what is it used for in aviation?

A

30KHz-300KHz, upper end for NDBs (navigational aids).

24
Q

What is the frequency for medium frequency (MF) and what is it used for?

A

300 KHz-3000 KHz (3 MHz), lower range for NDBs.

25
Q

Do space waves curve around the earth?

A

No, space waves do not curve around the earth; they are line of sight.

26
Q

Is there any way to extend VHF coverage beyond line of sight?

A

Yes, use a REPEATER to reflect space waves to extend beyond line of sight.

27
Q

What is Fading?

A

When two radio waves (a line of sight & a reflected wave) meet at the same point, they may cancel each other out (anti-phase).

28
Q

Are groundwaves line of sight?

A

No, they follow paths close to the Earth’s surface and roughly parallel to it.

29
Q

What is the ionosphere and how does it affect Sky waves (HF)?

A

The ionosphere is a layer of positively charged ions, which bend and weaken signals. It has the ability to reflect HF waves extending their range.

30
Q

What are the three types of waves?

A

Ground waves LF and MF, Sky waves HF, and Space waves VHF.

31
Q

High frequency transmissions send their energy through what type of wave?

A

Sky waves.

32
Q

Low and Medium Frequencies transmissions send their energy through what type of wave? And on what frequency?

A

Ground waves,
LF 30 KHz-300 KHz,
MF 300 KHz-3000 KHz (3 MHz).

33
Q

Very high frequency (VHF) transmissions send their energy through what type of wave? And on what frequency?

A

Space waves (direct waves), 30 MHz-300 MHz.

34
Q

What is modulation?

A

Step 1: We speak and transmit sound waves (in the Audio Frequency).
Step 2: These sound waves are superimposed onto a carrier wave (VHF) in order to be transmitted via radio.
Step 3: Once received, this superimposed message is then demodulated back into an audible frequency for us to hear.

35
Q

What are the two types of modulation?

A

Amplitude Modulation (AM) used by VHF aeronautical radios and Frequency Modulation (FM).

36
Q

What are the two types of intercom Systems and what are they used for?

A

SIMPLEX: Only one person can transmit on any one frequency at any one time. DUPLEX: Allows crew members to talk freely to each other without having to push any buttons.

37
Q

What is the Radios test Readability scale and how is the scale used?

A

Before an aircraft is taxied on the maneuvering area of an aerodrome, the pilot in command shall check that the radio apparatus is functioning correctly.

38
Q

If you request a radio check and tower responds with ‘three’, are you readable?

A

Yes, but with difficulty.

39
Q

Can you taxi without checking the function of the radio?

A

No.

40
Q

What is a listening watch?

A

Having the radio on from Taxi to shut down, listening in the background to other pilots and ATC to get any other useful information.

41
Q

What requires a read back?

A

ATC route clearances, en route holding instructions, any clearances and instructions.

42
Q

If you suffer a radio failure, what code should you squawk?

A

7600 (seven, six can’t hear shit).

43
Q

What do you squawk for a hijacking?

A

7500 (seven five taken alive).

44
Q

What do you squawk for an emergency?

A

7700 (seven, seven going to heaven).

45
Q

What is a transponder and what is it used for?

A

A transponder is a radar device used to identify in controlled airspace.

46
Q

How does a transponder work?

A

The secondary surveillance radar sends out a pulse signal that ‘paints’ your aircraft and then the transponder sends one back.

47
Q

What can a transponder allow ATC to see?

A

Altitude, speed and track as well as the squawk code set in the aircraft.

48
Q

What does the IDENT button do?

A

Pushing this button means that on the radar screen, your mark will turn blue and flash 5 times.

49
Q

What do you do if you are asked to squawk Charlie, Normal or Standby by ATC?

A

Squawk Charlie-Select ALT,
Squawk Normal-Select ON,
Squawk Standby-Select SBY.

50
Q

What code do you squawk in Civil VFR flights in class A, C and D airspace?

A

3000.

51
Q

What code do you squawk in Civil VFR flights in Class E or G airspace?

A

1200.

52
Q

What is TCAD and TCAS and how does it utilise transponders?

A

Modern aircraft may also be fitted with a Traffic & Collision Alert Device (TCAD) or a Traffic Collision Avoidance System (TCAS) which utilise aircraft transponders to help alert and avoid collisions

PPL (11 decks)

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