Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 12-science Answered

Why do we need amplification of modulated signal in a transmitter and again need amplification before detection?
Asked by Topperlearning User | 09 Jul, 2014, 09:05: AM
answered-by-expert Expert Answer

The power of the modulated signal is not high enough and hence the modulator is followed by a power amplifier. The amplifier provides necessary power and then feeds the modulated signal to the antenna of the transmitter.

While propagating through the channel. the transmitted signal gets attenuated.So to increase the power the receiving antenna is followed by an amplifier. The amplified signal is fed to the detector which separates the modulating signal and reproduces it back into message form.


Answered by | 09 Jul, 2014, 11:05: AM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 12-science - Physics
what is 5g technology and how it works?
Asked by sagarmishra | 08 Sep, 2023, 01:55: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
What is amplitude modulation? Explain the block diagram of a practical AM transmitter.
Asked by tanyagupta1874 | 17 Jan, 2022, 10:16: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
A carrier wave of peak voltage 15V is used to transmit a message signal. Findthe peak voltage of the modulating signal in order to have a modulation index of 60%.
Asked by cupatil | 07 Mar, 2018, 11:22: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
What do you understand by the term modulation?
Asked by Topperlearning User | 08 Jul, 2014, 09:23: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
With the help of diagram, explain the term amplitude modulation qualitatively.
Asked by Topperlearning User | 08 Jul, 2014, 09:45: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
What is the importance of depth of modulation?
Asked by Topperlearning User | 08 Jul, 2014, 10:05: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
What do you understand by frequency modulation? A signal of 10 kHz and peak voltage 20 V is used to modulate a carrier wave of frequency 10 MHz and peak voltage 40 V.Calculate a) depth of modulation .b) side bands frequencies.
Asked by Topperlearning User | 08 Jul, 2014, 10:36: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Write main advantages and disadvantages of the AM technique.
Asked by Topperlearning User | 08 Jul, 2014, 11:00: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Give three reasons which make modulation of message (or information) essential in a communication system.
Asked by Topperlearning User | 08 Jul, 2014, 11:14: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Explain with the help of diagram, how the process of modulation is carried out in radio broadcast?
Asked by Topperlearning User | 08 Jul, 2014, 11:23: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×