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Communication Systems

Question

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Which mode of propagation is used by short wave broadcast services?

Solution

Skywave is used to propagate shortwave broadcast services.

Question

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A carrier wave of peak voltage 15 V is used to transmit a message signal. Find the peak voltage of the modulating signal in order to have a modulation index of 60%.

Solution

It is given that peak voltage of carrier wave, A_c = 15V

and, Modulation index, m_u = 60% = 60/100

Then, the peak voltage of the modulating signal (A_m) will be given by the relation,

$μ = \frac{A_{m}}{A_{c}} 60 % = \frac{15 V}{A_{c}} A_{c} = \frac{15}{60} x 100 = 25 V$

Question

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Give three reasons why the modulation of a message signal is necessary for long-distance transmission.

Solution

Reasons:

Height of antenna
Power of signal
Utilization of frequency

Question

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Show graphically an audio signal, a carrier wave and an amplitude modulated wave.

Solution

Audio Signal: WiredFaculty

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