Oscillators and Modulators

Question 1

What is the modulation index in an FM phone signal having a maximum frequency deviation of 3,000 Hz on either side of the carrier frequency when the modulating frequency is 1,000 Hz?

Answer 1

3

Question 2

What is the modulation index of a FM phone transmitter producing a maximum carrier deviation of 6 kHz when modulated with a 2 kHz modulating frequency?

Answer 2

3

Question 3

What is the total bandwidth of a FM phone transmission having a 5 kHz deviation and a 3 kHz modulating frequency?

Answer 3

16 kHz

Question 4

How does the modulation index of a phase-modulated emission vary with RF carrier frequency?

Answer 4

It does not depend on the RF carrier frequency.

Question 5

How can a single-sideband phone signal be generated?

Answer 5

By using a balanced modulator followed by a filter.

Question 6

What is a balanced modulator?

Answer 6

A modulator that produces a double sideband, suppressed carrier signal.