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Trasmitting stations have their own transmitting frequency.

No one can construct an amplifier which amplifies signals over a wide range.

So every transmitting frequency has to be changed to one particular frequency. This is known as INTERMEDIATE frequency (IF)

This is quite possible by getting beats.

So a signal is to generated whose frequency is just more than the incoming frequency by IF

This signal is named as local singnal which is generated by the LOCAL oscillator.

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