Which frequency range is used for TV transmission? (A) 30Hz - 300Hz (B) 30kHz - 300kHz (C) 30MHz - 300MHz (D) 30GHz - 300GHz
Hint: Space wave communication is used for transmission of frequencies more than 30 MHz. Greater bandwidth is required for digital signals.
Complete Step by Step Solution: When the electromagnetic waves from the transmitting antenna reach the receiving antenna directly or after the reflection from earth's surface then the wave propagation is called space wave communication. Hence, it is also called line-of-sight communication. The concept of bandwidth is closely linked to the ability of a system to transmit information. If a signal has more bandwidth, it means that it includes or is compatible with higher frequencies—it can change more rapidly. Thus, more bandwidth corresponds to a higher maximum rate of data transfer. Digital data is transmitted via a television. We know that digital signals require higher bandwidth than analog signals. Space wave communication is used for transmission of frequencies more than 30 MHz. Thus, the frequency range used for TV transmission is 30MHz-300MHz.
The correct answer is Option C.
Note: Transmission and reception involve the components of a television system that generate, transmit, and utilize the television signal waveform. The scene to be televised is focused by a lens on an image sensor located within the camera. This produces the picture signal, and the synchronization and blanking pulses are then added, establishing the complete composite video waveform. The composite video signal and the sound signal are then imposed on a carrier wave of a specific allocated frequency and transmitted over the air or over a cable network. After passing through a receiving antenna or cable input at the television receiver, they are shifted back to their original frequencies and applied to the receiver’s display and loudspeaker. That is the process in brief; the specific functions of colour television transmitters and receivers are described in more detail in this section.