Electronics and Communication Engineering - Radio Receivers - Discussion

Discussion :: Radio Receivers - Section 1 (Q.No.27)


The selectivity of most receivers is determined largely by

[A]. sensitivity
[B]. characteristics of IF section
[C]. antenna direction
[D]. all of the above

Answer: Option B


No answer description available for this question.

Harish said: (Mar 15, 2016)  
A signal (image) can interfere with a superheterodyne receiver if fits the following equation.

Image = Signal +/- 2 x I.F.

Which says that a signal has the capacity to interfere with a superhet receiver if its frequency is equal to the signal frequency (1200 kHz in our question) plus or minus twice the IF (450 kHz in our question).

So one possible image is: 1200 + ( 2 x 450 ) = 2100 kHz (possible).

And the other: 1200 - ( 2 x 450 ) = 300 kHz (not likely).

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