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Equipment > EQT 1 Radio theory > Flashcards

EQT 1 Radio theory Flashcards

1
Q

What is electricity

A

A form of energy produced by the movement of electrons in atoms. It can be used to transmit and receive electromagnetic energy.

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2
Q

What are radio waves

How fast do they travel?

A

Electromagnetic energy that are similar in behaviour to light waves.

Travels at 3000000000 metres per second

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3
Q

What is audio limited by?

A

Range

How loud someone speaks

Absorption by materials within range

Attenuation

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4
Q

What is one wave cycle

A

Each time wave travels from zero up down and back to zero this counts as one cycle

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5
Q

What is amplitude

A

The max displacement or value attained by the wave from its mean value during the cycle

Basically from zero to peak and back to zero

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6
Q

What is wavelength represented by?

A

Lambada

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7
Q

What is a wavelength

A

The distance in metres or part of a metre between corresponding points in consecutive waves.

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8
Q

What is the frequency

A

Cycle per second - hertz

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9
Q

What is 1m wavelength in MHz

A

300 MHz

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10
Q

How do you calculate velocity

A

Velocity = frequency x wavelength

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11
Q

If the wavelength is longe is the frequency higher or lower?

A

Lower

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12
Q

What are carrier waves produced by?

A

A local oscillator

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13
Q

Local oscillator can manipulate what?

A

Amplitude or Frequency

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14
Q

What does AM stand for

A

Amplitude modulation

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15
Q

What does FM stand for?

A

Frequency Modulation

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16
Q

What does a modulator do?

A

Combines the audio and carrier wave

17
Q

What are the advantages or FM

A

Resilience to noise

Easy to apply modulation at low power - no boosting of amplitude required

Use of efficient RF amplifiers - less battery power required

18
Q

Advantages of AM

A

Stronger stations can override weaker

A heterodyne (squeal) indicates a blockage

19
Q

Is AM or FM used in ATC

A

AM

20
Q

What is the ideal length of an antenna

A

The same as wavelength of the frequency transmitted

21
Q

What does a RF amp do?

A

Makes signal stronger but also amplified static - has a noise gate fitted

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