### Discussion :: Radio Receivers - Section 1 (Q.No.29)

Manu said: (Nov 6, 2015) | |

Explain please! |

Moon said: (Jul 29, 2016) | |

Please explain how. |

Jam said: (Dec 8, 2016) | |

Kindly explain it. |

Venkat said: (Dec 28, 2016) | |

Please explain it. |

Ram Charan said: (Jan 3, 2017) | |

F (i.f.) =455khz, f = 25Mhz, Q = 10 here f(s.i) means imaginary frequence. Rejection ratio = sqrt (1+Q^2P^2). Here P = (f(s.i)/f - f(s)/f(s.i)). F(s.i) = f + 2f(i.f). = 25000+2 * 455. F(s.i) = 25910. P= {(25910/25000) - (25000/25910)}. = .0716. Rejection ratio = sqrt(1+Q^2P^2). Total solve R.r.=1.116 approx. |

Rishi Ram Sharma said: (May 4, 2017) | |

No, If Q=100 than Rejection Ratio at 25 MHZ should be near 7.22. Because of R. R = Sqrt(1+Q^2*P^2). Where P is same as Ram Charan Calculated. If Q=10 than Rejection Ratio at 25 MHZ should be near 1.226. Because of R. R=Sqrt(1+Q^2*P^2). Where P is same as Ram Charan Calculated. |

Jay said: (Aug 11, 2018) | |

Yes, I agree with you @Rishi Ram. |

Ebenezer said: (Sep 20, 2018) | |

It should be 7.22. |

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