Communication System

An amplitude modulated wave is as given in figure. Calculate the percentage modulation,

In optical communication systems operating at $1200 \mathrm{nm}$, only $2%$ of the source frequency is available for TV transmission having a bandwidth of $5 \mathrm{MHz}$. The number of TV channels that can be…

A bandwidth of $10MHz$ is available for $AM$ transmission. If the maximum audio signal frequency used for modulating the carrier is not to exceed $5\text{kHz,}$ how many stations can be broadcasted within this band…

The antenna current of an AM broadcast transmitter which is modulated by $50%$ is $11 A$. The carrier current is

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

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…

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

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

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

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

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

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: