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State three important factors showing the need for translating a low frequency signal into a high frequency wave before transmission
Concept: Modulation and Its Necessity
Draw a sketch of a sinusoidal carrier wave along with a modulating signal and show how these are superimposed to obtain the resultant amplitude modulated wave
Concept: Modulation and Its Necessity
The carrier wave is given by
C(t) = 2sin(8πt) volt.
The modulating signal is a square wave as shown. Find modulation index.
Concept: Modulation and Its Necessity
Write the functions of the following in communication systems:
Modulator
Concept: Basic Terminology Used in Electronic Communication Systems
Write the functions of the following in communication systems:
Transducer
Concept: Basic Terminology Used in Electronic Communication Systems
Write the functions of the following in communication systems:
Demodulator
Concept: Basic Terminology Used in Electronic Communication Systems
Why is Modulation index kept low?
Concept: Modulation and Its Necessity
What is the role of a bandpass filter?
Concept: Modulation and Its Necessity
Distinguish between broadcast mode and point-to-point mode of communication and give one example for each.
Concept: Basic Terminology Used in Electronic Communication Systems
A device X used in communication system can convert one form of energy into another. Name the device X. Explain the function of a repeater in a communication system.
Concept: Basic Terminology Used in Electronic Communication Systems
Distinguish between point to point and broadcast modes of communication. Give an example of each.
Concept: Basic Terminology Used in Electronic Communication Systems
Answer the following question :
Define 'bandwidth' and describe briefly its importance in communicating signals ?
Concept: Bandwidth of Signals
The carrier wave is represented by
Concept: Modulation and Its Necessity
The carrier wave of a signal is given by C(t) = 3 sin (8πt) volt. The modulating signal is a square wave as shown. Find its modulation index.
Concept: Modulation and Its Necessity
Write any two factors which justify the need for modulating a signal ?
Concept: Bandwidth of Signals
Draw a diagram showing an amplitude modulated wave by superposing a modulating signal over a sinusoidal carrier wave.
Concept: Bandwidth of Signals
Write briefly any two factors which demonstrate the need for modulating a signal. Draw a suitable diagram to show amplitude modulation using a sinusoidal signal as the modulating signal.
Concept: Bandwidth of Signals
Give two examples of communication system which use space wave mode.
A TV tower is 80 m tall. Calculate the maximum distance upto which the signal transmitted from the tower can be received.
Concept: Sinusoidal Waves
By what percentage will the transmission ranges of TV tower be affected when the height of the tower is increased by 21%?
Concept: Bandwidth of Transmission Medium
Why are high frequency carrier waves used for transmission?
Concept: Bandwidth of Transmission Medium
