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Modulation And Detection Of Signals Free Doubts and Solutions

CBSE - XII Science - Physics - Communication Systems

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 7th March 2018, 11:22 PM
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CBSE - XII Science - Physics - Communication Systems

explain gain in dB = 10log(Po/P)..............................................................and one more question ....plzzz explian with steps in an amplitude modulated wave for audio frequency of 500 cycles/s the apprioted carrier frequency will be...... explain by steps

Asked by Farooq Ahmad 13th April 2016, 8:08 PM
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CBSE - XII Science - Physics - Communication Systems

Draw a plot of the variation amplitude versus' w'(angular velocity) for an amplitude modulated wave.Define modulation index .State its importence for effective amplitude modulation.

Asked by Rajeev 21st February 2016, 11:13 PM
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CBSE - XII Science - Physics - Communication Systems

Define the term Modulation index for an AM wave. What would be the modulation index for an AM wave for which the maximum amplitude is 'a' while the minimum amplitude id 'b' ?

Asked by vinitapahel123 13th December 2015, 12:21 PM
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CBSE - XII Science - Physics - Communication Systems

HOW to make SOUND DETECTOR RADAR
EXPLAIN EACH STEP PLEASE
 
 
please help me this is my PROJECT

Asked by Shahwar 14th June 2015, 2:09 PM
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CBSE - XII Science - Physics - Communication Systems

Draw a plot of the variation of amplitude with for an amplitude modulated wave. Define modulation index. State its importance for effective amplitude modulation.

Asked by Topperlearning User 9th July 2014, 11:12 AM
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CBSE - XII Science - Physics - Communication Systems

Why is frequency modulation preferred over amplitude modulation for transmission of music?

Asked by Topperlearning User 9th July 2014, 10:49 AM
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CBSE - XII Science - Physics - Communication Systems

Define the term modulation. Name three different types of modulations used for a message signal using a sinusoidal continuous carrier wave. Explain the meaning of any one of these.

Asked by Topperlearning User 9th July 2014, 10:43 AM
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CBSE - XII Science - Physics - Communication Systems

1.If a signal of frequency Wm is used to modulate a carrier wave of frequency Wc, which are the frequencies contained in the modulated signal other than Wc? 2.State the formula for modulation index in terms of limiting values of amplitude of modulated wave.

Asked by Topperlearning User 9th July 2014, 10:34 AM
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CBSE - XII Science - Physics - Communication Systems

A transmitting antenna at the top of a tower has a height of 22 m and the height of the receiving antenna 40 m. What is the maximum distance between them, for satisfactory communication in LOS mode ? ( Radius of earth = 6400 km) 

Asked by Topperlearning User 9th July 2014, 10:33 AM
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CBSE - XII Science - Physics - Communication Systems

1.Define modulation index. 2.What is the preferable value of modulation index in AM system, high value or moderate value?

Asked by Topperlearning User 9th July 2014, 9:42 AM
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CBSE - XII Science - Physics - Communication Systems

A modulating signal has zero dc component and peak to peak voltage of 11 V. It is used to amplitude modulate a carrier of peak voltage of 10 V. Calculate the modulation index.

Asked by Topperlearning User 9th July 2014, 9:27 AM
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CBSE - XII Science - Physics - Communication Systems

Why do we need amplification of modulated signal in a transmitter and again need amplification before detection?

Asked by Topperlearning User 9th July 2014, 9:05 AM
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CBSE - XII Science - Physics - Communication Systems

Mention three advantages and three disadvantages of Frequency Modulation.

Asked by Topperlearning User 9th July 2014, 8:35 AM
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CBSE - XII Science - Physics - Communication Systems

Which type of modulation is used for the waves which are not continuous but are in the form of pulses?

Asked by Topperlearning User 8th July 2014, 1:27 PM
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CBSE - XII Science - Physics - Communication Systems

What is detector? Draw the block diagram of a receiver of AM wave. 

Asked by Topperlearning User 8th July 2014, 1:13 PM
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CBSE - XII Science - Physics - Communication Systems

Analytically explain the process of amplitude modulation. What is the frequency spectrum of AM signal?

Asked by Topperlearning User 8th July 2014, 12:59 PM
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CBSE - XII Science - Physics - Communication Systems

Explain with the help of diagram, how the process of modulation is carried out in radio broadcast?

Asked by Topperlearning User 8th July 2014, 11:23 AM
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CBSE - XII Science - Physics - Communication Systems

Give three reasons which make modulation of message (or information) essential in a communication system.

Asked by Topperlearning User 8th July 2014, 11:14 AM
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CBSE - XII Science - Physics - Communication Systems

Write main advantages and disadvantages of the AM technique.

Asked by Topperlearning User 8th July 2014, 11:00 AM
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CBSE - XII Science - Physics - Communication Systems

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 8th July 2014, 10:36 AM
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CBSE - XII Science - Physics - Communication Systems

What is the importance of depth of modulation?

Asked by Topperlearning User 8th July 2014, 10:05 AM
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CBSE - XII Science - Physics - Communication Systems

With the help of diagram, explain the term amplitude modulation qualitatively.

Asked by Topperlearning User 8th July 2014, 9:45 AM
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CBSE - XII Science - Physics - Communication Systems

What do you understand by the term modulation?

Asked by Topperlearning User 8th July 2014, 9:23 AM
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CBSE - XII Science - Physics - Communication Systems

A transmitting antenna at the top of a tower has a height of 36m and the height of the receiving antenna is 49m. What is the maximum distance between them, for satisfactory communication in the LOS mode? (Radius of earth = 6400km)

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Communication Systems

What would be the modulation index for an amplitude modulated wave for which the maximum amplitude is 'a' while the minimum amplitude is 'b'.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Communication Systems

A carrier wave of peak voltage 12 V is used to transmit a message signal. What should be the peak voltage of the modulating signal, in order to have a modulation index of 75%.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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