Courses
Courses for Kids
Free study material
Offline Centres
More
Store

# In a superheterodyne receiver, the IF is $455{\text{ }}kHz$ . If it is tuned $1200{\text{ }}kHz$ , the image frequency will be A) $1562{\text{ }}kHz$ B) $1675{\text{ }}kHz$ C) $2110{\text{ }}kHz$ D) $2025{\text{ }}kHz$

Last updated date: 20th Jun 2024
Total views: 54.3k
Views today: 1.54k
Verified
54.3k+ views
Hint:In a superheterodyne receiver, the station frequency plus we have to do twice the intermediate frequency equal to an image frequency is an undesired input frequency.

It is given that the question as $455{\text{ }}kHz$ is called the intermediate frequency (IF) of a radio.
Without going into great detail, $455{\text{ }}kHz$ is one of the most commonly used IFs used in the super heterodyne radio.
IF = $455{\text{ }}kHz$
It is tuned to${\text{1200 }}kHz$
To find the image frequency is
Any signal is capable of interfering with super heterodyne receiver if,
Image frequency = tuned signal$\pm 2 \times I.F$
Tuned frequency = ${\text{1200 }}kHz$ and
IF =$455{\text{ }}kHz$ is given.
Therefore, image frequency $= 1200 \pm 910$
Hence, the image frequency is = ${\text{2110 }}kHz$ or ${\text{290 }}kHz$.

So, the image frequency will be option (C) is ${\text{2110 }}kHz$.

Additional Information:Heterodyning which simply means mixing, superheterodyne receiver works on the principle.
By a local oscillator it is a type of receiver which mixes the received signal frequency with the frequency of the signal generated.
As a known intermediate frequency the output of the mixer provides a lower fixed frequency.
The sum and their difference of the applied frequencies and also their harmonics that can in multiple frequencies applied that is a nonlinear device to produce the new frequencies.