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My TO3 > Amplitude Modulation > Flashcards

Amplitude Modulation Flashcards

0
Q

What are the three main types of modulation?

A

Amplitude
Frequency
Phase

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1
Q

Define Modulation

A

The process by which information is superimposed onto a carrier wave so as to send it a greater distance.

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2
Q

Define the Modulating Wave.

A

The waveform of the original intelligence.

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3
Q

Define the Carrier Wave.

A

The waveform that is used to carry the information contained in the Modulating Wave, it is the signal you centre to and the one that is actually sent.

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4
Q

What is another term for the carrier frequency?

A

RF or Radio Frequency

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5
Q

Define Amplitude Modulation.

A

The method whereby the amplitude of the Modulated Wave is varied in accordance with the amplitude of the Modulating Wave.

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6
Q

The outline shape of the Amplitude Modulated frequency is referred to as?

A

The envelope.

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7
Q

What is it referred to as when the envelope amplitude stays the same?

A

A constant envelope

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8
Q

What is it referred to as when the envelope amplitude changes repetitively?

A

A periodic envelope

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9
Q

What is Fm?

A

The Modulating Wave.

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10
Q

What is “fc”?

A

The Carrier Frequency.

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11
Q

What is “fc+fm”

A

Upper Side Band

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12
Q

What is the Lower Side Band rendered to as?

A

“fc-fm”

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13
Q

How is the power of an Amplitude Modulated Wave spread?

A

Evenly amongst the sidebands.

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14
Q

What do the two sidebands have in common?

A

They are mirror images of each other in amplitude.

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15
Q

What is the envelope more of than an instantaneous measurement?

A

A trend

16
Q

What is the Depth of Modulation?

A

A ,easier or ho much the “fm” affects the “fc”, as a percentage.

17
Q

What is the formula for calculating the Depth of Modulation?

A

Peak AF Voltage / Peak RF Voltage 100 = DoM%

18
Q

What states can a Carrier Frequency (fc) be in?

A

Full or Suppressed

19
Q

How would a Double Side Band with a Suppressed Carrier be noted in a log?

A

DSBSC (Double Side Band Suppressed Carrier

20
Q

Name any two disadvantages of Double Side Band transmissions.

A

Wasteful on power
Excessive bandwidth
Prone to selective fading

21
Q

In simple terms, how is a Single Side Band transmission produced?

A

A Double Side Band is created, and one Side Band is then stripped off before transmission.

22
Q

What is an advantage of a SSB?

A

All of the power can be used on one side band

My TO3 (2 decks)

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