Frequency Shift Keying (fsk) Flashcards

1
Q

What is frequency shift keying ?

A

A modulation whereby the RF carrier is caused to alternate between two or more discrete frequency values

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2
Q

What is shift?

A

The difference between two adjacent frequency levels on a two level FSK.

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3
Q

What is excursion?

A

The difference from the highest frequency level to the lowest frequency level.

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4
Q

What is deviation frequency ?

A

The difference in frequency from

The centre of the FSK to the highest or lowest frequency level.

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5
Q

What is square wave modulation index SMI ?

A

The ratio of the deviation frequency (fd) to the modulating frequency (fm)

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6
Q

How do we work out SMI?

A

Bauds

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7
Q

Minimum bandwidth is equal to what ?

A

2(fd+fm)

Or

Shift + bauds

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8
Q

If the modulation index is high what are we likely to see on the spectrum ?

A

The frequency levels are very distinct and easy to see each frequency carrier.

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