In a superheterodyne receiver with an intermediate frequency (IF) of 450 kHz, if the receiver is tuned to a signal frequency of 1200 kHz, what is the corresponding image frequency?

Introduction / Context:The concept of image frequency is central to understanding the operation of superheterodyne receivers. The image frequency is an undesired signal that can also be converted to the same intermediate frequency (IF), potentially causing interference if not rejected by the RF front-end.

Given Data / Assumptions:

• Signal frequency fs = 1200 kHz.
• Intermediate frequency fi = 450 kHz.
• Local oscillator frequency chosen as flo = fs + fi = 1650 kHz (high-side injection).

Concept / Approach:The image frequency fsi is defined as fsi = flo + fi or fsi = flo − fi depending on injection side. For high-side injection (LO above signal), fsi = flo + fi = 1650 + 450 = 2100 kHz.

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