Analog Communication - Electronic Engineering (MCQ) questions & answers for Q. 13728

Q.  In terms of signal frequency (fs) and intermediate frequency (fi), the image frequency is given by
- Published on 14 Oct 15

a. fs + fi
b. fs + 2fi
c. 2fs + fi
d. 2( fs + fi)

ANSWER: fs + 2fi
 
The image frequency is defined as the signal frequency added to twice the value of intermediate frequency. It is the undesirable frequency generated at the receiver which also gets amplified with the message signal. The image frequency causes interference and therefore two or more stations or sources may be received simultaneously at the receiver output.

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