Show which of the following statements about the amplitude limiter is untrue:

Electronics and Communication Engineering (ECE) : Radio Receivers - Quiz(MCQ)

The output must be tuned

Leak-type bias must be used

The circuit is always biased in class C, by virtue of the leak-type bias.

When the input increases past the threshold of the limiting, the gain decreases to keep the output constant.

Correct Answer : Option (C) : The circuit is always biased in class C, by virtue of the leak-type bias.

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In a superheterodyne receiver, the IF is 455 kHz. If it is tuned to 1200 kHz, the image frequency will be

745 kHz

910 kHz

1655 kHz

2110 kHz

Correct Answer : 2110 kHz

Explanation : 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 (455 kHz in our question).

So one possible image is : 1200 + ( 2 x 455 ) = 2110 kHz (possible).

And the other: 1200 - ( 2 x 455 ) = 290 kHz (not likely).