Which of the following statement about the amplitude limiter is not valid?

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

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 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).