IGNOU PHE 16 2026 - Explain the image frequency and double spotting phenomena in case of A

Question

Explain the image frequency and double spotting phenomena in case of AM receivers. How can they be overcome?

28 Jan 2026

Answer :

Word Count : 273

In an AM superheterodyne receiver, image frequency and double spotting are important undesired phenomena associated with frequency conversion in the mixer stage. When a radio frequency (RF) signal is mixed with the local oscillator (LO) frequency, the intermediate frequency (IF) is produced as the difference between them. For a desired signal of frequency ( f_s ), the local oscillator is adjusted such that ( f_{IF} = |f_s - f_{LO}| ). However, there exists another signal of frequency ( f_i ), called the image frequency, which also satisfies the same IF condition, given by

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