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The intermediate frequency of a superheterodyne receiver is 500KHz. What is the image frequency at 1200KHz?

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The intermediate frequency of a superheterodyne receiver is 500KHz. What is the image frequency at 1200KHz?

(a) 600KHz

(b) 500KHz

(c) 700KHz

(d) 200KHz

This question was addressed to me in final exam.

This intriguing question comes from Envelope Detector in section Amplitude Modulation of Analog Communications

1 Answer

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Correct option is (c) 700KHz

To elaborate: The image frequency is an undesired input frequency which is demodulated by superheterodyne receivers along with the desired incoming signal. This results in two stations being received at the same time, thus producing interference. In the given problem, Image frequency is equal to (1200 – 500) which is equal to 700KHz.

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