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…

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

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…

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) $\begin{array}{llll}\mathrm{A} & \mathrm{B} & \mathrm{C} & \mathrm{D}\end{array}$

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…

A transmitting antenna of height $20 \mathrm{~m}$ and the receiving antenna of height $h$ are separated by a distance of $40 \mathrm{~km}$ for satisfactory communication in line of sight (Los) mode. Then the value of…

The process of increasing the strength of a signal using an electronic circuit is called

For transmitting a signal of frequency 1000 kHz, the minimum length of the antenna is

A TV tower has a height of $150 \mathrm{~m}$. If the population density around the TV tower is $10^3 \mathrm{~km}^{-2}$ then the population covered by the tower is (Radius of the earth, $\mathrm{R}=6.4 \times 10^6…

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