In a ratio detector______ - Radio Receivers

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

In a ratio detector______

the linearity is worse than in phase discriminator

stabilization against signal strength variations is provided

the output is twice that obtainable from a similar phase discriminator

the circuit is the same as in a discriminator, except that the diodes are reversed

Correct Answer : Option (A) : the linearity is worse than in phase discriminator

Recently Updated in Radio Receivers Questions

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).