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ATPL - Radio Navigation > Radio Theory > Flashcards

Radio Theory Flashcards

1
Q

Range of frequencies and wavelengths of HF band?

A

3 MHz - 30 MHz

100m - 10m (decametric)

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2
Q

Range of frequencies and wavelengths of VLF band?

A

3 kHz - 30 kHz

100km - 10km (myriametric)

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3
Q

1 KHz=

1 MHz=

1 GHz=

A

1 KHz= 1000 Hz

1 MHz= 1 000 000 Hz

1 GHz= 1 000 000 000 Haz

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4
Q

What is the formula to find frequency?

What units must each be in?

A

F= C/W

Frequency in Hz

Speed of light in m/s

Wavelength in meters

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5
Q

Range of frequencies and wavelengths of UHF band?

A

300 MHz - 3 ghz

1m - 10cm (decimetric)

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6
Q

Range of radio frequencies (lowest to highest)

A

3 kHz - 300 ghz

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7
Q

What is the speed of light per second?

A

300 000 000 m/s (3x10p8 m/s)

162 000 NM/s

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8
Q

Range of frequencies and wavelengths of MF band?

A

300 kHz - 3 MHz

1km - 100m (hectometric)

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9
Q

Mnemonic to remember frequency bands?

A 
Very
Lovely
Maidens 
Have
Very
Useful
Sewing
Equipment
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10
Q

Range of frequencies and wavelengths of EHF band?

A

30 ghz - 300ghz

1cm - 1mm (millimetric)

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11
Q

Range of frequencies and wavelengths of LF band?

A

30 kHz - 300 kHz

10km - 1km (kilometric)

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12
Q

Range of frequencies and wavelengths of VHF band?

A

30 MHz - 300 MHz

10m - 1m (metric)

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13
Q

What is a transducer?

A

A device that converts energy from one type to another

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14
Q

Range of frequencies and wavelengths of SHF band?

A

3 ghz - 30 ghz

10cm - 1cm (centimetric)

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15
Q

What is Amplitude Modulation and Frequency Modulation?

A

Addition of information to the carrier wave by varying the amplitude and frequency respectively

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16
Q

Ideal size of a dipole aerial?

A

Quarter or half the wavelength

17
Q

A parabolic aerial transmits…

A

Directional signals (pencil beam)

18
Q

A phase array aerial is made up of…

A

A series of small

19
Q

What is Doppler shift?

A

An apparent change in frequency due to the relative movement between the transmitter and receiver.

Moving towards each other will increase frequency, moving away will reduce frequency.

ATPL - Radio Navigation (13 decks)

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