Communication System

The maximum distance between the transmitting and receiving TV towers is $65 \mathrm{~km}$. If the ratio of the heights of the TV transmitting tower to receiving tower is $36: 49$, the heights of the transmitting and…

Three signals related to amplitude modulation are shown in the figure. The correct assignment of the signals is

Match Column A (layers in the ionosphere for skywave propagation) with Column B (their height range) $\begin{array}{llll}\mathrm{A} & \mathrm{B} & \mathrm{C} & \mathrm{D}\end{array}$

An AM wave has \(1800 \mathrm{~W}\) of total power content for \(100 \%\) modulation the carrier should have power content equal to

A signal of frequency \(10 \mathrm{kHz}\) and peak voltage \(10 \mathrm{~V}\) is used to amplitude modulate a carrier of frequency \(1 \mathrm{MHz}\) and peak voltage \(20 \mathrm{~V}\). The side-band frequencies in…

A speech signal of $3 \mathrm{kHz}$ is used to modulate a carrier signal of frequency $1 \mathrm{MHz}$, using amplitude modulation. The frequencies of the side bands will be

The process of recovering the modulating signal from the modulated carrier wave is called

An information signal of frequency 10 kHz is modulated with a carrier waive of frequency 3.61 MHz. The upper side and lower side frequencies are:

In amplitude modulation, if a message signal of 5 kHz is modulated by a carrier wave of frequency 900 kHz, then the frequencies of the side bands are

The maximum amplitude of an amplitude modulated wave is $16 \mathrm{~V}$, while the minimum amplitude is $4 \mathrm{~V}$. The modulation index is

If the maximum and minimum amplitudes of a modulated wave are 25 V and 5 V respectively, then the modulation index is

If \(E_c\) and \(E_m\) are peak values of carrier and modulating signals, respectively then for \(100 \%\) modulation,