# F.M., A.M. and S.S.B. transmitters

### Explanation of question 15

A frequency mixer circuit is supplied with two frequencies, f1 = 3.5MHz and f2 = 465kHz. A frequency which CANNOT appear at the output is

The answer is :- 3 When two frequencies f1 and f2 are mixed, the output is xf1 ± yf2, where x and y are whole numbers. ((f2 - f1) cannot exist, as seen by substituting the values.)

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