Analog communication systems
Previous year question paper with solutions for Analog communication systems
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- Explain the need of modulation. Differentiate linear and non-linear modulation with mathematical equations.
- Describe the changes in FM spectrum, when deviation (f ), or modulating frequency ( f m) are changed, independently.
- With the help of block diagram, differentiate low-level modulation and high level modulation.
- Describe the working of Frequency converters and mixers with the help of circuit diagrams.
- Describe selectivity and sensitivity. How can they be plotted for a given receiver?
- Describe FM capture effect.
- An SSB transmission contains 10 kw. This transmission is to be replaced by a standard amplitude modulated single with the same power content. Determine the power content as the carries and each of the side bonds when the percent modulation is 70%.
- Describe sampling theorem. Write Interpolation formula. What is Aliasing?
- Write the practical values of Bandwidth, IF, and frequency deviation for AM & FM.
- Explain, why local oscillator frequency is kept higher than single frequency, and not vice-versa.