In a broadcast superheterodyne receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 150. If the IF is 455 kHz, calculate the image frequency and its rejection ratio at 1400 kHz.

Mumbai University > Electronics Engineering > Sem4 > Fundamentals of Communication Engineering

Marks: 5M

Year: Dec2014

Given Data:

Quality factor, Q = 150

Intermediate frequency, $f_{IF}$ = 455 kHz

Signal frequency, $ f_s$=1400 kHz

To find :

Image signal frequency, $f_{si}$ = ?

Rejection ratio, α = ?

Solution:

Image frequency $f_{si}$ is given by:

$f_{si} = f_s + 2 f_{IF} \\ \ \ \ = …