Frequency Modulation

Question 1

The deviation ratio is the:

Answer 1

Maximum carrier frequency deviation to the highest audio modulating frequency.

Question 2

What is the deviation ratio for an FM phone signal having a maximum frequency deviation of plus or minus 5 kHz and accepting a maximum modulation rate of 3 kHz?

Answer 2

1.66

Question 3

What is the deviation ratio of an FM-phone signal having a maximum frequency swing of plus or minus 7.5 kHz and accepting a maximum modulation rate of 3.5 kHz?

Answer 3

2.14

Question 4

How can an FM-phone signal be produced in a transmitter?

Answer 4

By feeding the audio directly to the oscillator.

Question 5

What is meant by the term modulation index?

Answer 5

The ratio between the deviation of a frequency modulated signal and the modulating frequency.

Question 6

In an FM-phone signal, what is the term for the maximum deviation from the carrier frequency divided by the maximum audio modulating frequency?

Answer 6

Deviation ratio