HSC Science (Electronics) 12th Board ExamMaharashtra State Board
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Explain the Need for Modulation Related to the Size of Antenna (Aerial). - HSC Science (Electronics) 12th Board Exam - Physics

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Question

Explain the need for modulation related to the size of antenna (aerial).

Solution

1) For transmitting a signal, we need an antenna or an aerial. This antenna should have length comparable to the quarter wavelength of the signal (λ/4) so that the antenna properly senses the time variation of signal

2)For an electromagnetic wave of frequency 20 kHz, wavelength λ is 15 km. Thus, vertical antenna of this size required at audio frequencies (< 20 KHZ) is impracticable. Hence, direct transmission of such baseband signals is not practical.

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APPEARS IN

 2012-2013 (October) (with solutions)
Question 7.5 | 2.00 marks
Solution Explain the Need for Modulation Related to the Size of Antenna (Aerial). Concept: Modulation and Its Necessity.
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