The standard value for Intermediate frequency (IF) in AM receivers is

10.5KHz

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55 KHz

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455 KHz.

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none of the above

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Solution

The correct option is C 455 KHz.
Intermediate frequency (IF) is a frequency at which received carrier frequency is shifted for detection of message signal .The IF is generated by mixing the receive carrier with locally generated signal .In super heterodyne AM receivers , an intermediate frequency of 455KHZ is used .

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The intermediate frequency (IF) of an AM superheterodyne receiver is 450 kHz and the local oscilliator frequency (F_{L O}) of the mixer is set at the higher of the two possible values, such that f_{L O} > f_{c} always. If the carrier frequency (f_{c}) of the received signal is 650 kHz, then the carrier frequency of the corresponding image signal will be equal to_______kHz.

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