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Comms > VHF comms fundamentals (17-07-18) > Flashcards

VHF comms fundamentals (17-07-18) Flashcards

1
Q

What is the frequency range of the air band?

A

108 - 137MHz

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2
Q

What is the frequency range of th aeronautical mobile service?

A

118 - 137 MHz

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3
Q

What is the VHF frequency range?

A

30 - 300 MHz

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4
Q

How does VHF propagate and how is it affected by terrain and buildings?

A

LOS, relatively unaffected by buildings

but can be very affected by terrain.

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5
Q

What is super refraction?

A

Ducting of radio signals

layers form in the atmosphere that facilitates conducting of these waves

increases range of VHF waves

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6
Q

Why is VHF used instead of HF signals?

A

VHF is less affected by static from noise and electrical interference than HF.

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7
Q

What can fading be caused by?

A

Multiple A/C transmitting on the same channel, having the same frequency, causing destructive interference.

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8
Q

What is the range of a transmitted VHF signal?

A

Range = root(Power)

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9
Q

What is the normal max range planned for VHF transmission?

A

Approx 25nm

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10
Q

What is the minimum frequency separation of VHF signals in Europe?

A

8.33kHz

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11
Q

What is the normal frequency separation for VHF signals?

A

25kHz

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12
Q

Where must an A/C have a frequency separation capability of 8.33kHz?

A

Above FL195 in EU airspace.

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13
Q

When is the word ‘point’ used instead of ‘decimal’ when reading out numbers?

A

When talking about radio capability

eg: 8.33 is 8 ‘point’ 33 NOT 8 ‘decimal’ 33

wheras 118.090 would be 118 ‘decimal’ 090

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14
Q

What is the general procedure for speaking over radio?

A

Before transmission, listen for any ongoing communication

Think about what to say

Speak clearly with a normal tone

Speak at 100 words per minute

Use standard RT, but if unsure use plain english

Release transmit button after finished speaking

If no response is given, wait at least 10 seconds before trying again

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15
Q

What are some non phonetic ‘standard’ readbacks?

A

QNH

QFE

ILS

VOR

NDB

RVR

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16
Q

How are numbers read out?

A

1-9, 100, 1000

(only altitude is fully pronounced)

17
Q

If QNH is lower than 1000 then what must be added to the end of the number read out?

A

hectopascals

18
Q

In what case do you only need to read out the first digit after a decimal point?

A

If the last 2 digits are 0

19
Q

When reading out time, when do you not need to read the hour?

A

When you can be certain about what the hour is.

20
Q

What is the accuracy of time measured to?

A

The nearest half minute

21
Q

How long should a test transmission be?

A

no longer than 10seconds.

22
Q

How is a test transmission structured?

A

1- aeronautical station

2- call sign

3- ‘radio check’

4- frequency

23
Q

What does ‘readability 1’ mean?

A

Unreadable

24
Q

What does ‘readability 2’ mean?

A

Readable now and then

25
Q

What does ‘readability 3’ mean?

A

Readable but with difficulty

26
Q

What does ‘readability 4’ mean?

A

readable

27
Q

What does ‘readability 5’ mean?

A

Perfectly readable

28
Q

What is the structure of a transmission for establishing contact with a station?

A

1- station being addressed

2- call sign

3- A/C type

4- Position

5- other info (eg ATIS)

6- request

29
Q

What should be at the end of every radio transmission from an A/C?

A

Call sign

30
Q

What are mandatory read backs?

A

Clearances (taxi, TO, landing, routes etc.)

Altimeter settings

Transponder operating instructions

Heading, altitude and speed instructions

VHF direction finding

Type of air traffic service (eg. Traffic Service UK)

Frequency changes

Anything to do with runway other than runway state

31
Q

What is not a mandatory read back?

A

Wind information

A/C confliction instructions

Comms (12 decks)

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