Modulation

The diagram given below shows the block diagram of a detector for AM signals.


Label the unlabelled boxes in this block diagram indicated by (b) and (c).

Which of the following factors justify the need of modulating a signal:

Among following, the factor which justifies the need of modulating a signal is

How does the effective power radiated by an antenna (of length l) vary with wavelength?

In amplitude modulation, bandwidth is _____ maximum frequency of the audio signal.

What is the minimum length of antenna required to transmit a radio signal of frequency $20 \mathrm{MHz}$ ?

If $\lambda$ is the wavelength of the signal, then the size of antenna should be comparable to

Which of the following modes of transmission has the lowest noise immunity?

__________ type of transmission, one complete side-band of the signal and half of the remaining side-band is sent together. Enable GingerCannot connect to Ginger Check your internet connection
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Which of the following is a type of amplitude modulation?

Give three advantages of amplitude modulation.

In case of Phase modulation, the phase of _____ wave is modulated with respect to information signal.

How does transmitting antenna work ?

For good transmission high frequency transmission is required.

The effective power radiated by the antenna is inversely proportional to the square of wavelength.

A sinusoidal carrier voltage of frequency $1 \mathrm{M}\mathrm{H}\mathrm{z}$ and amplitude $100 \mathrm{V}$ is modulated by a sinusoidal voltage of frequency $5 \mathrm{k}\mathrm{H}\mathrm{z}$ producing $50 \mathrm{\%}$ modulation.The lower sideband frequency is _____ $\mathrm{kHz}$, upper sideband frequency is _____ $\mathrm{kHz}$ and amplitude of each sideterm is _____ $\mathrm{V}$.

A carrier wave of frequency $10 \mathrm{M}\mathrm{H}\mathrm{z}$ and peak value $10 \mathrm{V}$ is amplitude modulated by a $5 \mathrm{k}\mathrm{H}\mathrm{z}$ sine wave of amplitude $6 \mathrm{V}.$ Calculate the amplitude of the two side-bandsin volts.

A message signal of $12 \mathrm{kHz}$ and peak voltage $20 \mathrm{V}$ is used to modulate a carrier wave of frequency $12 \mathrm{MHz}$ and peak voltage $30 \mathrm{V}.$ Calculate the modulation index.

A $100 \mathrm{m}$ long antenna is mounted on a $500 \mathrm{m}$ tall building. The complex can become a transmission tower for waves with $\lambda$

In the communication systems, Amplitude modulation is used for broadcasting because