$AM$ (Amplitude Modulation) is used for broadcasting because...
- AIt has higher noise immunity than other modulation systems.
- BIt requires less transmission power than other modulation systems.
- CIt reduces the complexity of the receiver.
- DOther modulation systems do not provide the bandwidth required for reliable transmission.
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$A$ modulating signal is a square wave,as shown in the figure. If the carrier wave is given as $c(t) = 2 \sin(8 \pi t)$ volts,the modulation index is:
The $T.V.$ transmission tower in Delhi has a height of $245 \ m$. The distance up to which the broadcast can be received (taking the radius of the earth to be $6.4 \times 10^6 \ m$) is .......... $km$.
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View SolutionAn information signal of frequency $10 \text{ kHz}$ is modulated with a carrier wave of frequency $3.61 \text{ MHz}$. The upper sideband and lower sideband frequencies are:
When the receiving antenna is on the ground,the range of a transmitting antenna of height $980 \ m$ is (Radius of the earth $= 6400 \ km$) (in $km$)
In a communication system,the process of superimposing a low-frequency signal on a high-frequency wave is known as:
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