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Communication miscellaneous
  1. The intermediate frequency of a superheterodyne receiver is 150 kHz. If the image frequency of a station is 2100 kHz, its actual frequency is—
    1. 750 kHz
    2. 900 kHz
    3. 1200 kHz
    4. 1010 kHz
Correct Option: C

Image frequency fimg = fc + 2fIF
2100 kHz = fc + 2 × 450 kHz
or fc = 2100 – 900 = 1200 kHz


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