F023 TAv 21 - Comms EO 21.03

Which of these statements best describes a Frequency Modulated Signal

• a carrier of constant amplitude, whose instantaneous frequency is varied in sympathy with the modulating frequency.

• a carrier of constant frequency, whose amplitude is varied in sympathy with the modulating frequency.

• a carrier of constant amplitude, whose Phase is varied in sympathy with the modulating frequency.

In an FM signal, the amount by which the carrier frequency is varied either side of its “norm” frequency is called...

• Deviation

• Depth of Modulation

• Bandwidth

• Convergence

Which of the following equations would you use to calculate the bandwidth of a FM signal?

What is the term given for something that measures how fast the frequency changes within an FM signal?

• The Rate of Deviation

• The Extent of Deviation

• The Swing of Frequency

• The Bandwidth of Signal

with regard to an FM signal, what would a change in amplitude represent?

• Noise

• Pitch of the modulating frequency (f_m)

• Amplitude of the modulating frequency (f_m)

• Change of phase in the modulating frequency (f_m)

On the diagram which letter represents the component that;

amplifies the small signals from the microphone sufficiently to produce the required control of the oscillator frequency?

On the diagram which letter represents the component that;

isolates the master oscillator from the changing power levels in the output stage?

On the diagram which letter represents the component that;

changes the selected channel frequency (RF) to the fixed IF?

On the diagram which letter represents the component that;

removes variations in amplitude so that the discriminator receives a constant amplitude signal?

Which of the following properties or characteristics are advantages of using FM over AM?

• Signal Quality

• Signal Level Variations

• Capture Effect

• Bandwidth

• Coverage