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What is the alias produced when a signal of 15 MHz is sampled at a rate of 28 MHz?

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What is the alias produced when a signal of 15 MHz is sampled at a rate of 28 MHz?

(a) 10MHz

(b) 11MHz

(c) 12MHz

(d) 13MHz

This question was addressed to me in a national level competition.

The query is from Data Conversion in chapter Digital Communication Techniques of Avionics

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Right choice is (d) 13MHz

For explanation I would say: Frequency of alias signal = fa = fs – fm = 28-15 = 13MHz.

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